# Project description
This is an application to analyze base pairing patterns of DNA/RNA 3D
structures to find and classify tetrads and quadruplexes. ElTetrado
assigns tetrads to one of the ONZ classes (O, N, Z) alongside with the
directionality of the tetrad (+/-) determined by the bonds between bases
and their non-canonical interactions. The interactions follow
Leontis/Westhof classification (Leontis *et al.* 2001). Watson-Crick (W)
edge of first base in the tetrad structure exposed to the Hoogsteen (H)
edge of the next nucleobase from the same tetrad sets the tetrad
directionality, clockwise (+) or anticlockwise (-). For more details,
please refer to Zok *et al.* (2020) and Popenda *et al.* (2020)
# Installation
Please run:
pip install eltetrado
If you have both Python 2 and Python 3 installed, you need to explicitly
call `pip3`:
pip3 install eltetrado
# Dependencies
The project is written in Python 3.6+ and requires
[mmcif](https://pypi.org/project/mmcif/),
[orjson](https://github.com/ijl/orjson), [NumPy](https://numpy.org/) and
[requests](https://docs.python-requests.org/en/latest/).
Visualization is created by `R` 3.6+ script which uses
[R4RNA](https://www.e-rna.org/r-chie/) (Lai *et al.* 2012) library. The
dependency will be automatically installed if not present.
Base pairs and stacking interactions are identified by
[RNApolis](https://github.com/tzok/rnapolis-py).
# Usage
ElTetrado is a command line application, which requires to be provided
with `--input` and a path to a PDB or PDBx/mmCIF file.
By default, ElTetrado outputs textual results on the standard output. A
JSON version of the output can be obtained with `--output` switch
followed by a path where the file is supposed to be created.
ElTetrado prepares visualization of the whole structure and of each
N4-helices, quadruplexes and tetrads. This can be supplemented with
canonical base pairs visualization when `--complete-2d` is set. All
color settings are located in the first several lines of the `quadraw.R`
file, you can easily change them without knowledge of R language. If you
want ElTetrado to not visualize anything, pass `--no-image` switch to
it.
usage: eltetrado [-h] [-i INPUT] [-o OUTPUT] [-m MODEL]
[--stacking-mismatch STACKING_MISMATCH] [--strict]
[--no-reorder] [--complete-2d] [--no-image]
[--dssr-json DSSR_JSON] [-v]
options:
-h, --help show this help message and exit
-i INPUT, --input INPUT
path to input PDB or PDBx/mmCIF file
-o OUTPUT, --output OUTPUT
(optional) path for output JSON file
-m MODEL, --model MODEL
(optional) model number to process
--stacking-mismatch STACKING_MISMATCH
a perfect tetrad stacking covers 4 nucleotides; this
option can be used with value 1 or 2 to allow this
number of nucleotides to be non-stacked with otherwise
well aligned tetrad [default=2]
--strict nucleotides in tetrad are found when linked only by
cWH pairing
--no-reorder chains of bi- and tetramolecular quadruplexes should
be reordered to be able to have them classified; when
this is set, chains will be processed in original
order, which for bi-/tetramolecular means that they
will likely be misclassified; use with care!
--complete-2d when set, the visualization will also show canonical
base pairs to provide context for the quadruplex
--no-image when set, the visualization will not be created at all
--dssr-json DSSR_JSON
(optional) provide a JSON file generated by DSSR to
read the secondary structure information from (use
--nmr and --json switches)
-v, --version show program's version number and exit
# Chains reorder
ElTetrado keeps a global and unique 5’-3’ index for every nucleotide
which is independent from residue numbers. For example, if a structure
has chain M with 60 nucleotides and chain N with 15 nucleotides, then
ElTetrado will keep index between 0 and 74 which uniquely identifies
every nucleotide. Initially, ElTetrado assigns this indices according to
the order of chains in the input file. Therefore, if M preceded N then
nucleotides in M will be indexed from 0 to 59 and in N from 60 to 74.
Otherwise, nucleotides in N will be indexed from 0 to 14 and in M from
15 to 74.
When `--no-reorder` is present, this initial assignment is used.
Otherwise, ElTetrado exhaustively checks all permutations of chains’
orders. Every permutation check induces recalculation of the global and
unique 5’-3’ index and in effect it changes ONZ classification of
tetrads.
ElTetrado keeps a table of tetrad classification scores according to
these rules:
- Type preference: `O` \> `N` \> `Z`
- Direction preference: `+` \> `-`
The table keeps low values for preferred classes i.e. `O+` is 0, `O-` is
1 and so on up to `Z-` with score 5. For every permutation of chain
orders, ElTetrado computes sum of scores for tetrads classification
induced by 5’-3’ indexing. We select permutation with the minimum value.
# Examples
## 2HY9: Human telomere DNA quadruplex structure in K+ solution hybrid-1 form
$ curl ftp://ftp.wwpdb.org/pub/pdb/data/structures/divided/mmCIF/my/2hy9.cif.gz | gzip -d > 2hy9.cif
$ ./eltetrado --input 2hy9.cif --output 2hy9.json
Chain order: 1
n4-helix with 3 tetrads
Oh* V,VI 9a -(pll) quadruplex with 3 tetrads
1.DG4 1.DG22 1.DG18 1.DG10 cWH cWH cWH cWH O- Vb planarity=0.17
direction=hybrid rise=3.21 twist=16.23
1.DG5 1.DG23 1.DG17 1.DG11 cHW cHW cHW cHW O+ Va planarity=0.1
direction=hybrid rise=3.11 twist=27.45
1.DG6 1.DG24 1.DG16 1.DG12 cHW cHW cHW cHW O+ VIa planarity=0.18
Tracts:
1.DG4, 1.DG5, 1.DG6
1.DG22, 1.DG23, 1.DG24
1.DG18, 1.DG17, 1.DG16
1.DG10, 1.DG11, 1.DG12
Loops:
propeller- 1.DT7, 1.DT8, 1.DA9
lateral- 1.DT13, 1.DT14, 1.DA15
lateral+ 1.DT19, 1.DT20, 1.DA21
AAAGGGTTAGGGTTAGGGTTAGGGAA
...([{...(((...)))...)]}..
...([{...)]}...(((...)))..
<details>
<summary>
Click to see the output JSON
</summary>
``` json
{
"metals": [],
"nucleotides": [
{
"index": 1,
"chain": "1",
"number": 1,
"icode": null,
"molecule": "DNA",
"fullName": "1.DA1",
"shortName": "A",
"chi": 22.308282830857802,
"glycosidicBond": "syn"
},
{
"index": 2,
"chain": "1",
"number": 2,
"icode": null,
"molecule": "DNA",
"fullName": "1.DA2",
"shortName": "A",
"chi": -123.05454402191421,
"glycosidicBond": "anti"
},
{
"index": 3,
"chain": "1",
"number": 3,
"icode": null,
"molecule": "DNA",
"fullName": "1.DA3",
"shortName": "A",
"chi": -94.96579955603106,
"glycosidicBond": "anti"
},
{
"index": 4,
"chain": "1",
"number": 4,
"icode": null,
"molecule": "DNA",
"fullName": "1.DG4",
"shortName": "G",
"chi": 79.28363721639316,
"glycosidicBond": "syn"
},
{
"index": 5,
"chain": "1",
"number": 5,
"icode": null,
"molecule": "DNA",
"fullName": "1.DG5",
"shortName": "G",
"chi": -126.01709201555563,
"glycosidicBond": "anti"
},
{
"index": 6,
"chain": "1",
"number": 6,
"icode": null,
"molecule": "DNA",
"fullName": "1.DG6",
"shortName": "G",
"chi": -127.26656202302102,
"glycosidicBond": "anti"
},
{
"index": 7,
"chain": "1",
"number": 7,
"icode": null,
"molecule": "DNA",
"fullName": "1.DT7",
"shortName": "T",
"chi": -63.10830751967371,
"glycosidicBond": "syn"
},
{
"index": 8,
"chain": "1",
"number": 8,
"icode": null,
"molecule": "DNA",
"fullName": "1.DT8",
"shortName": "T",
"chi": -138.79520345559828,
"glycosidicBond": "anti"
},
{
"index": 9,
"chain": "1",
"number": 9,
"icode": null,
"molecule": "DNA",
"fullName": "1.DA9",
"shortName": "A",
"chi": -148.83990757408878,
"glycosidicBond": "anti"
},
{
"index": 10,
"chain": "1",
"number": 10,
"icode": null,
"molecule": "DNA",
"fullName": "1.DG10",
"shortName": "G",
"chi": 58.7787525019158,
"glycosidicBond": "syn"
},
{
"index": 11,
"chain": "1",
"number": 11,
"icode": null,
"molecule": "DNA",
"fullName": "1.DG11",
"shortName": "G",
"chi": -123.85746807924986,
"glycosidicBond": "anti"
},
{
"index": 12,
"chain": "1",
"number": 12,
"icode": null,
"molecule": "DNA",
"fullName": "1.DG12",
"shortName": "G",
"chi": -84.36679807284759,
"glycosidicBond": "syn"
},
{
"index": 13,
"chain": "1",
"number": 13,
"icode": null,
"molecule": "DNA",
"fullName": "1.DT13",
"shortName": "T",
"chi": -30.819029132834157,
"glycosidicBond": "syn"
},
{
"index": 14,
"chain": "1",
"number": 14,
"icode": null,
"molecule": "DNA",
"fullName": "1.DT14",
"shortName": "T",
"chi": -168.51776782812965,
"glycosidicBond": "anti"
},
{
"index": 15,
"chain": "1",
"number": 15,
"icode": null,
"molecule": "DNA",
"fullName": "1.DA15",
"shortName": "A",
"chi": -105.72881577106517,
"glycosidicBond": "anti"
},
{
"index": 16,
"chain": "1",
"number": 16,
"icode": null,
"molecule": "DNA",
"fullName": "1.DG16",
"shortName": "G",
"chi": 74.3227942181243,
"glycosidicBond": "syn"
},
{
"index": 17,
"chain": "1",
"number": 17,
"icode": null,
"molecule": "DNA",
"fullName": "1.DG17",
"shortName": "G",
"chi": 81.08424926936044,
"glycosidicBond": "syn"
},
{
"index": 18,
"chain": "1",
"number": 18,
"icode": null,
"molecule": "DNA",
"fullName": "1.DG18",
"shortName": "G",
"chi": -122.90397217111551,
"glycosidicBond": "anti"
},
{
"index": 19,
"chain": "1",
"number": 19,
"icode": null,
"molecule": "DNA",
"fullName": "1.DT19",
"shortName": "T",
"chi": -102.98239337113938,
"glycosidicBond": "anti"
},
{
"index": 20,
"chain": "1",
"number": 20,
"icode": null,
"molecule": "DNA",
"fullName": "1.DT20",
"shortName": "T",
"chi": -112.1514601849715,
"glycosidicBond": "anti"
},
{
"index": 21,
"chain": "1",
"number": 21,
"icode": null,
"molecule": "DNA",
"fullName": "1.DA21",
"shortName": "A",
"chi": -89.07113063649612,
"glycosidicBond": "syn"
},
{
"index": 22,
"chain": "1",
"number": 22,
"icode": null,
"molecule": "DNA",
"fullName": "1.DG22",
"shortName": "G",
"chi": 83.44318693001902,
"glycosidicBond": "syn"
},
{
"index": 23,
"chain": "1",
"number": 23,
"icode": null,
"molecule": "DNA",
"fullName": "1.DG23",
"shortName": "G",
"chi": -115.41210237198398,
"glycosidicBond": "anti"
},
{
"index": 24,
"chain": "1",
"number": 24,
"icode": null,
"molecule": "DNA",
"fullName": "1.DG24",
"shortName": "G",
"chi": -111.14845782593531,
"glycosidicBond": "anti"
},
{
"index": 25,
"chain": "1",
"number": 25,
"icode": null,
"molecule": "DNA",
"fullName": "1.DA25",
"shortName": "A",
"chi": -58.323530637551954,
"glycosidicBond": "syn"
},
{
"index": 26,
"chain": "1",
"number": 26,
"icode": null,
"molecule": "DNA",
"fullName": "1.DA26",
"shortName": "A",
"chi": -90.84065243137135,
"glycosidicBond": "anti"
}
],
"basePairs": [
{
"nt1": "1.DA3",
"nt2": "1.DA21",
"lw": "cHW",
"inTetrad": false,
"canonical": false
},
{
"nt1": "1.DG4",
"nt2": "1.DG10",
"lw": "cHW",
"inTetrad": true,
"canonical": false
},
{
"nt1": "1.DG4",
"nt2": "1.DG22",
"lw": "cWH",
"inTetrad": true,
"canonical": false
},
{
"nt1": "1.DG5",
"nt2": "1.DG11",
"lw": "cWH",
"inTetrad": true,
"canonical": false
},
{
"nt1": "1.DG5",
"nt2": "1.DG23",
"lw": "cHW",
"inTetrad": true,
"canonical": false
},
{
"nt1": "1.DG6",
"nt2": "1.DG12",
"lw": "cWH",
"inTetrad": true,
"canonical": false
},
{
"nt1": "1.DG6",
"nt2": "1.DG24",
"lw": "cHW",
"inTetrad": true,
"canonical": false
},
{
"nt1": "1.DG10",
"nt2": "1.DG18",
"lw": "cHW",
"inTetrad": true,
"canonical": false
},
{
"nt1": "1.DG11",
"nt2": "1.DG17",
"lw": "cWH",
"inTetrad": true,
"canonical": false
},
{
"nt1": "1.DG12",
"nt2": "1.DG16",
"lw": "cWH",
"inTetrad": true,
"canonical": false
},
{
"nt1": "1.DT14",
"nt2": "1.DA25",
"lw": "tWW",
"inTetrad": false,
"canonical": false
},
{
"nt1": "1.DG16",
"nt2": "1.DG24",
"lw": "cWH",
"inTetrad": true,
"canonical": false
},
{
"nt1": "1.DG17",
"nt2": "1.DG23",
"lw": "cWH",
"inTetrad": true,
"canonical": false
},
{
"nt1": "1.DG18",
"nt2": "1.DG22",
"lw": "cHW",
"inTetrad": true,
"canonical": false
}
],
"helices": [
{
"quadruplexes": [
{
"tetrads": [
{
"id": "1.DG4-1.DG22-1.DG18-1.DG10",
"nt1": "1.DG4",
"nt2": "1.DG22",
"nt3": "1.DG18",
"nt4": "1.DG10",
"onz": "O-",
"gbaClassification": "Vb",
"planarityDeviation": 0.17372283960377805,
"ionsChannel": [],
"ionsOutside": []
},
{
"id": "1.DG5-1.DG23-1.DG17-1.DG11",
"nt1": "1.DG5",
"nt2": "1.DG23",
"nt3": "1.DG17",
"nt4": "1.DG11",
"onz": "O+",
"gbaClassification": "Va",
"planarityDeviation": 0.10474313820007483,
"ionsChannel": [],
"ionsOutside": []
},
{
"id": "1.DG6-1.DG24-1.DG16-1.DG12",
"nt1": "1.DG6",
"nt2": "1.DG24",
"nt3": "1.DG16",
"nt4": "1.DG12",
"onz": "O+",
"gbaClassification": "VIa",
"planarityDeviation": 0.18293509778060615,
"ionsChannel": [],
"ionsOutside": []
}
],
"onzm": "Oh*",
"loopClassification": {
"classification": "9a",
"loopProgression": "-(pll)"
},
"gbaClassification": [
"V",
"VI"
],
"tracts": [
[
"1.DG4",
"1.DG5",
"1.DG6"
],
[
"1.DG22",
"1.DG23",
"1.DG24"
],
[
"1.DG18",
"1.DG17",
"1.DG16"
],
[
"1.DG10",
"1.DG11",
"1.DG12"
]
],
"loops": [
{
"type": "propeller-",
"nucleotides": [
"1.DT7",
"1.DT8",
"1.DA9"
]
},
{
"type": "lateral-",
"nucleotides": [
"1.DT13",
"1.DT14",
"1.DA15"
]
},
{
"type": "lateral+",
"nucleotides": [
"1.DT19",
"1.DT20",
"1.DA21"
]
}
]
}
],
"tetradPairs": [
{
"tetrad1": "1.DG4-1.DG22-1.DG18-1.DG10",
"tetrad2": "1.DG5-1.DG23-1.DG17-1.DG11",
"direction": "hybrid",
"rise": 3.2109650905140654,
"twist": 16.228973729066034
},
{
"tetrad1": "1.DG5-1.DG23-1.DG17-1.DG11",
"tetrad2": "1.DG6-1.DG24-1.DG16-1.DG12",
"direction": "hybrid",
"rise": 3.1149939255558747,
"twist": 27.448958336697046
}
]
}
],
"dotBracket": {
"sequence": "AAAGGGTTAGGGTTAGGGTTAGGGAA",
"line1": "...([{...(((...)))...)]}..",
"line2": "...([{...)]}...(((...))).."
}
}
```
</details>
## 4RJ1: Structural variations and solvent structure of UGGGGU quadruplexes stabilized by Sr2+ ions
$ curl https://www.ebi.ac.uk/pdbe/static/entry/download/4rj1-assembly-1.cif.gz | gzip -d > 4rj1-1.cif
$ ./eltetrado --input 4rj1-1.cif --output 4rj1-1.json
Chain order: A AB AA AC B BC BA BB
n4-helix with 10 tetrads
Op* VIII n/a quadruplex with 5 tetrads
A.U1006 AC.U1006 AA.U1006 AB.U1006 cWH cWH cWH cWH O- VIIIa planarity=1.06 ions_channel=NA ions_outside=A.U1006: [SR] AA.U1006: [SR] AB.U1006: [SR] AC.U1006: [SR]
direction=parallel rise=3.37 twist=39.96
A.G1005 AC.G1005 AA.G1005 AB.G1005 cHW cHW cHW cHW O+ VIIIa planarity=0.8
direction=parallel rise=3.31 twist=25.9
A.G1004 AC.G1004 AA.G1004 AB.G1004 cHW cHW cHW cHW O+ VIIIa planarity=0.41 ions_channel=SR
direction=parallel rise=3.34 twist=35.81
A.G1003 AC.G1003 AA.G1003 AB.G1003 cHW cHW cHW cHW O+ VIIIa planarity=0.55 ions_channel=SR
direction=parallel rise=3.29 twist=27.12
A.G1002 AC.G1002 AA.G1002 AB.G1002 cHW cHW cHW cHW O+ VIIIa planarity=0.54 ions_outside=AB.G1002: [CA] AC.G1002: [CA] AA.G1002: [CA] A.G1002: [CA]
Tracts:
A.U1006, A.G1005, A.G1004, A.G1003, A.G1002
AC.U1006, AC.G1005, AC.G1004, AC.G1003, AC.G1002
AA.U1006, AA.G1005, AA.G1004, AA.G1003, AA.G1002
AB.U1006, AB.G1005, AB.G1004, AB.G1003, AB.G1002
Op* VIII n/a quadruplex with 5 tetrads
B.G2002 BC.G2002 BA.G2002 BB.G2002 cWH cWH cWH cWH O+ VIIIa planarity=0.67
direction=parallel rise=3.37 twist=27.41
B.G2003 BC.G2003 BA.G2003 BB.G2003 cWH cWH cWH cWH O+ VIIIa planarity=0.58 ions_channel=SR ions_outside=B.G2003: [CA] BA.G2003: [CA] BB.G2003: [CA] BC.G2003: [CA]
direction=parallel rise=3.32 twist=35.04
B.G2004 BC.G2004 BA.G2004 BB.G2004 cWH cWH cWH cWH O+ VIIIa planarity=0.23 ions_channel=SR
direction=parallel rise=3.27 twist=25.15
B.G2005 BC.G2005 BA.G2005 BB.G2005 cWH cWH cWH cWH O+ VIIIa planarity=0.78 ions_channel=NA
direction=parallel rise=7.14 twist=43.41
B.U2006 BC.U2006 BA.U2006 BB.U2006 cHW cHW cHW cHW O- VIIIa planarity=1.58 ions_channel=NA,NA
Tracts:
B.G2002, B.G2003, B.G2004, B.G2005, B.U2006
BC.G2002, BC.G2003, BC.G2004, BC.G2005, BC.U2006
BA.G2002, BA.G2003, BA.G2004, BA.G2005, BA.U2006
BB.G2002, BB.G2003, BB.G2004, BB.G2005, BB.U2006
UGGGGU-UGGGGU-UGGGGU-UGGGGU-UGGGGU-UGGGGU-UGGGGU-UGGGGU
.([{<A-.([{<A-.)]}>a-.)]}>a-.([{<A-.)]}>a-.([{<A-.)]}>a
.([{<A-.)]}>a-.([{<A-.)]}>a-.([{<A-.([{<A-.)]}>a-.)]}>a
<details>
<summary>
Click to see the output JSON
</summary>
``` json
{
"metals": [
{
"symbol": "Sr",
"count": 8
},
{
"symbol": "Na",
"count": 4
},
{
"symbol": "Ca",
"count": 12
}
],
"nucleotides": [
{
"index": 1,
"chain": "A",
"number": 1001,
"icode": null,
"molecule": "RNA",
"fullName": "A.U1001",
"shortName": "U",
"chi": -141.92671313255752,
"glycosidicBond": "anti"
},
{
"index": 2,
"chain": "A",
"number": 1002,
"icode": null,
"molecule": "RNA",
"fullName": "A.G1002",
"shortName": "G",
"chi": -165.93034671112116,
"glycosidicBond": "anti"
},
{
"index": 3,
"chain": "A",
"number": 1003,
"icode": null,
"molecule": "RNA",
"fullName": "A.G1003",
"shortName": "G",
"chi": -121.5652426033226,
"glycosidicBond": "anti"
},
{
"index": 4,
"chain": "A",
"number": 1004,
"icode": null,
"molecule": "RNA",
"fullName": "A.G1004",
"shortName": "G",
"chi": -156.00957673923344,
"glycosidicBond": "anti"
},
{
"index": 5,
"chain": "A",
"number": 1005,
"icode": null,
"molecule": "RNA",
"fullName": "A.G1005",
"shortName": "G",
"chi": -148.10051684016415,
"glycosidicBond": "anti"
},
{
"index": 6,
"chain": "A",
"number": 1006,
"icode": null,
"molecule": "RNA",
"fullName": "A.U1006",
"shortName": "U",
"chi": -137.28005568139983,
"glycosidicBond": "anti"
},
{
"index": 13,
"chain": "AA",
"number": 1001,
"icode": null,
"molecule": "RNA",
"fullName": "AA.U1001",
"shortName": "U",
"chi": -141.9267131325575,
"glycosidicBond": "anti"
},
{
"index": 14,
"chain": "AA",
"number": 1002,
"icode": null,
"molecule": "RNA",
"fullName": "AA.G1002",
"shortName": "G",
"chi": -165.93034671112113,
"glycosidicBond": "anti"
},
{
"index": 15,
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"tetrad1": "A.U1006-AC.U1006-AA.U1006-AB.U1006",
"tetrad2": "A.G1005-AC.G1005-AA.G1005-AB.G1005",
"direction": "parallel",
"rise": 3.366499999999995,
"twist": 39.962531742191736
},
{
"tetrad1": "A.G1005-AC.G1005-AA.G1005-AB.G1005",
"tetrad2": "A.G1004-AC.G1004-AA.G1004-AB.G1004",
"direction": "parallel",
"rise": 3.308000000000007,
"twist": 25.89614444631925
},
{
"tetrad1": "A.G1004-AC.G1004-AA.G1004-AB.G1004",
"tetrad2": "A.G1003-AC.G1003-AA.G1003-AB.G1003",
"direction": "parallel",
"rise": 3.339499999999994,
"twist": 35.81115298630443
},
{
"tetrad1": "A.G1003-AC.G1003-AA.G1003-AB.G1003",
"tetrad2": "A.G1002-AC.G1002-AA.G1002-AB.G1002",
"direction": "parallel",
"rise": 3.2865,
"twist": 27.11515971986803
},
{
"tetrad1": "A.G1002-AC.G1002-AA.G1002-AB.G1002",
"tetrad2": "B.G2002-BC.G2002-BA.G2002-BB.G2002",
"direction": "parallel",
"rise": 3.369500000000002,
"twist": 28.993180312675573
},
{
"tetrad1": "B.G2002-BC.G2002-BA.G2002-BB.G2002",
"tetrad2": "B.G2003-BC.G2003-BA.G2003-BB.G2003",
"direction": "parallel",
"rise": 3.371000000000002,
"twist": 27.410084968596852
},
{
"tetrad1": "B.G2003-BC.G2003-BA.G2003-BB.G2003",
"tetrad2": "B.G2004-BC.G2004-BA.G2004-BB.G2004",
"direction": "parallel",
"rise": 3.318000000000005,
"twist": 35.04072146975963
},
{
"tetrad1": "B.G2004-BC.G2004-BA.G2004-BB.G2004",
"tetrad2": "B.G2005-BC.G2005-BA.G2005-BB.G2005",
"direction": "parallel",
"rise": 3.2689999999999966,
"twist": 25.149997949938147
},
{
"tetrad1": "B.G2005-BC.G2005-BA.G2005-BB.G2005",
"tetrad2": "B.U2006-BC.U2006-BA.U2006-BB.U2006",
"direction": "parallel",
"rise": 7.140499999999998,
"twist": 43.40609492262336
}
]
}
],
"dotBracket": {
"sequence": "UGGGGU-UGGGGU-UGGGGU-UGGGGU-UGGGGU-UGGGGU-UGGGGU-UGGGGU",
"line1": ".([{<A-.([{<A-.)]}>a-.)]}>a-.([{<A-.)]}>a-.([{<A-.)]}>a",
"line2": ".([{<A-.)]}>a-.([{<A-.)]}>a-.([{<A-.([{<A-.)]}>a-.)]}>a"
}
}
```
</details>
# Funding
This research was supported by the National Science Centre, Poland
\[2016/23/B/ST6/03931, 2019/35/B/ST6/03074\] and Mloda Kadra project
\[09/91/SBAD/0684\] from Poznan University of Technology, and carried
out in the European Centre for Bioinformatics and Genomics (Poland). The
authors also acknowledge partial support by the statutory funds of
Poznan University of Technology, Polish Ministry of Science and Higher
Education, and the Institute of Bioorganic Chemistry, PAS within
intramural financing program.
# Bibliography
<div id="refs" class="references csl-bib-body">
1. Topology-Based Classification of Tetrads and Quadruplex
Structures. M. Popenda, J. Miskiewicz, J. Sarzynska, T. Zok, M.
Szachniuk. *Bioinformatics*. 2020. 36(4):1129–1134.
doi:[10.1093/bioinformatics/btz738](https://doi.org/10.1093/bioinformatics/btz738)
2. ElTetrado: A Tool for Identification and Classification of Tetrads
and Quadruplexes. T. Zok, M. Popenda, M. Szachniuk. *BMC
Bioinformatics*. 2020. 21(1):40.
doi:[10.1186/s12859-020-3385-1](https://doi.org/10.1186/s12859-020-3385-1)
3. R-Chie : A Web Server and R Package for Visualizing RNA Secondary
Structures. D. Lai, J.R. Proctor, J.Y.A. Zhu, I.M. Meyer. *Nucleic
Acids Research*. 2012. 40(12):e95.
doi:[f99845](https://doi.org/f99845)
4. Geometric Nomenclature and Classification of RNA Base Pairs. N.B.
Leontis, E. Westhof. *RNA*. 2001. 7(4):499–512.
doi:[10.1017/s1355838201002515](https://doi.org/10.1017/s1355838201002515)
</div>
Raw data
{
"_id": null,
"home_page": "https://github.com/tzok/eltetrado",
"name": "eltetrado",
"maintainer": "",
"docs_url": null,
"requires_python": ">=3.6",
"maintainer_email": "",
"keywords": "",
"author": "Tomasz \u017bok",
"author_email": "tomasz.zok@cs.put.poznan.pl",
"download_url": "https://files.pythonhosted.org/packages/6f/f0/64382657d6ced6f8d5f6ca622bf1fe7b466b3ac5640c69a9835b8c39d921/eltetrado-1.5.16.tar.gz",
"platform": null,
"description": "\n\n# Project description\n\nThis is an application to analyze base pairing patterns of DNA/RNA 3D\nstructures to find and classify tetrads and quadruplexes. ElTetrado\nassigns tetrads to one of the ONZ classes (O, N, Z) alongside with the\ndirectionality of the tetrad (+/-) determined by the bonds between bases\nand their non-canonical interactions. The interactions follow\nLeontis/Westhof classification (Leontis *et al.* 2001). Watson-Crick (W)\nedge of first base in the tetrad structure exposed to the Hoogsteen (H)\nedge of the next nucleobase from the same tetrad sets the tetrad\ndirectionality, clockwise (+) or anticlockwise (-). For more details,\nplease refer to Zok *et al.* (2020) and Popenda *et al.* (2020)\n\n# Installation\n\nPlease run:\n\n pip install eltetrado\n\nIf you have both Python 2 and Python 3 installed, you need to explicitly\ncall `pip3`:\n\n pip3 install eltetrado\n\n# Dependencies\n\nThe project is written in Python 3.6+ and requires\n[mmcif](https://pypi.org/project/mmcif/),\n[orjson](https://github.com/ijl/orjson), [NumPy](https://numpy.org/) and\n[requests](https://docs.python-requests.org/en/latest/).\n\nVisualization is created by `R` 3.6+ script which uses\n[R4RNA](https://www.e-rna.org/r-chie/) (Lai *et al.* 2012) library. The\ndependency will be automatically installed if not present.\n\nBase pairs and stacking interactions are identified by\n[RNApolis](https://github.com/tzok/rnapolis-py).\n\n# Usage\n\nElTetrado is a command line application, which requires to be provided\nwith `--input` and a path to a PDB or PDBx/mmCIF file.\n\nBy default, ElTetrado outputs textual results on the standard output. A\nJSON version of the output can be obtained with `--output` switch\nfollowed by a path where the file is supposed to be created.\n\nElTetrado prepares visualization of the whole structure and of each\nN4-helices, quadruplexes and tetrads. This can be supplemented with\ncanonical base pairs visualization when `--complete-2d` is set. All\ncolor settings are located in the first several lines of the `quadraw.R`\nfile, you can easily change them without knowledge of R language. If you\nwant ElTetrado to not visualize anything, pass `--no-image` switch to\nit.\n\n usage: eltetrado [-h] [-i INPUT] [-o OUTPUT] [-m MODEL]\n [--stacking-mismatch STACKING_MISMATCH] [--strict]\n [--no-reorder] [--complete-2d] [--no-image]\n [--dssr-json DSSR_JSON] [-v]\n\n options:\n -h, --help show this help message and exit\n -i INPUT, --input INPUT\n path to input PDB or PDBx/mmCIF file\n -o OUTPUT, --output OUTPUT\n (optional) path for output JSON file\n -m MODEL, --model MODEL\n (optional) model number to process\n --stacking-mismatch STACKING_MISMATCH\n a perfect tetrad stacking covers 4 nucleotides; this\n option can be used with value 1 or 2 to allow this\n number of nucleotides to be non-stacked with otherwise\n well aligned tetrad [default=2]\n --strict nucleotides in tetrad are found when linked only by\n cWH pairing\n --no-reorder chains of bi- and tetramolecular quadruplexes should\n be reordered to be able to have them classified; when\n this is set, chains will be processed in original\n order, which for bi-/tetramolecular means that they\n will likely be misclassified; use with care!\n --complete-2d when set, the visualization will also show canonical\n base pairs to provide context for the quadruplex\n --no-image when set, the visualization will not be created at all\n --dssr-json DSSR_JSON\n (optional) provide a JSON file generated by DSSR to\n read the secondary structure information from (use\n --nmr and --json switches)\n -v, --version show program's version number and exit\n\n# Chains reorder\n\nElTetrado keeps a global and unique 5\u2019-3\u2019 index for every nucleotide\nwhich is independent from residue numbers. For example, if a structure\nhas chain M with 60 nucleotides and chain N with 15 nucleotides, then\nElTetrado will keep index between 0 and 74 which uniquely identifies\nevery nucleotide. Initially, ElTetrado assigns this indices according to\nthe order of chains in the input file. Therefore, if M preceded N then\nnucleotides in M will be indexed from 0 to 59 and in N from 60 to 74.\nOtherwise, nucleotides in N will be indexed from 0 to 14 and in M from\n15 to 74.\n\nWhen `--no-reorder` is present, this initial assignment is used.\nOtherwise, ElTetrado exhaustively checks all permutations of chains\u2019\norders. Every permutation check induces recalculation of the global and\nunique 5\u2019-3\u2019 index and in effect it changes ONZ classification of\ntetrads.\n\nElTetrado keeps a table of tetrad classification scores according to\nthese rules:\n\n- Type preference: `O` \\> `N` \\> `Z`\n- Direction preference: `+` \\> `-`\n\nThe table keeps low values for preferred classes i.e.\u00a0`O+` is 0, `O-` is\n1 and so on up to `Z-` with score 5. For every permutation of chain\norders, ElTetrado computes sum of scores for tetrads classification\ninduced by 5\u2019-3\u2019 indexing. We select permutation with the minimum value.\n\n# Examples\n\n## 2HY9: Human telomere DNA quadruplex structure in K+ solution hybrid-1 form\n\n\n\n $ curl ftp://ftp.wwpdb.org/pub/pdb/data/structures/divided/mmCIF/my/2hy9.cif.gz | gzip -d > 2hy9.cif\n $ ./eltetrado --input 2hy9.cif --output 2hy9.json\n\n Chain order: 1\n n4-helix with 3 tetrads\n Oh* V,VI 9a -(pll) quadruplex with 3 tetrads\n 1.DG4 1.DG22 1.DG18 1.DG10 cWH cWH cWH cWH O- Vb planarity=0.17 \n direction=hybrid rise=3.21 twist=16.23\n 1.DG5 1.DG23 1.DG17 1.DG11 cHW cHW cHW cHW O+ Va planarity=0.1 \n direction=hybrid rise=3.11 twist=27.45\n 1.DG6 1.DG24 1.DG16 1.DG12 cHW cHW cHW cHW O+ VIa planarity=0.18 \n\n Tracts:\n 1.DG4, 1.DG5, 1.DG6\n 1.DG22, 1.DG23, 1.DG24\n 1.DG18, 1.DG17, 1.DG16\n 1.DG10, 1.DG11, 1.DG12\n\n Loops:\n propeller- 1.DT7, 1.DT8, 1.DA9\n lateral- 1.DT13, 1.DT14, 1.DA15\n lateral+ 1.DT19, 1.DT20, 1.DA21\n\n AAAGGGTTAGGGTTAGGGTTAGGGAA\n ...([{...(((...)))...)]}..\n ...([{...)]}...(((...)))..\n\n<details>\n<summary>\nClick to see the output JSON\n</summary>\n\n``` json\n{\n \"metals\": [],\n \"nucleotides\": [\n {\n \"index\": 1,\n \"chain\": \"1\",\n \"number\": 1,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DA1\",\n \"shortName\": \"A\",\n \"chi\": 22.308282830857802,\n \"glycosidicBond\": \"syn\"\n },\n {\n \"index\": 2,\n \"chain\": \"1\",\n \"number\": 2,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DA2\",\n \"shortName\": \"A\",\n \"chi\": -123.05454402191421,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 3,\n \"chain\": \"1\",\n \"number\": 3,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DA3\",\n \"shortName\": \"A\",\n \"chi\": -94.96579955603106,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 4,\n \"chain\": \"1\",\n \"number\": 4,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DG4\",\n \"shortName\": \"G\",\n \"chi\": 79.28363721639316,\n \"glycosidicBond\": \"syn\"\n },\n {\n \"index\": 5,\n \"chain\": \"1\",\n \"number\": 5,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DG5\",\n \"shortName\": \"G\",\n \"chi\": -126.01709201555563,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 6,\n \"chain\": \"1\",\n \"number\": 6,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DG6\",\n \"shortName\": \"G\",\n \"chi\": -127.26656202302102,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 7,\n \"chain\": \"1\",\n \"number\": 7,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DT7\",\n \"shortName\": \"T\",\n \"chi\": -63.10830751967371,\n \"glycosidicBond\": \"syn\"\n },\n {\n \"index\": 8,\n \"chain\": \"1\",\n \"number\": 8,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DT8\",\n \"shortName\": \"T\",\n \"chi\": -138.79520345559828,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 9,\n \"chain\": \"1\",\n \"number\": 9,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DA9\",\n \"shortName\": \"A\",\n \"chi\": -148.83990757408878,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 10,\n \"chain\": \"1\",\n \"number\": 10,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DG10\",\n \"shortName\": \"G\",\n \"chi\": 58.7787525019158,\n \"glycosidicBond\": \"syn\"\n },\n {\n \"index\": 11,\n \"chain\": \"1\",\n \"number\": 11,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DG11\",\n \"shortName\": \"G\",\n \"chi\": -123.85746807924986,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 12,\n \"chain\": \"1\",\n \"number\": 12,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DG12\",\n \"shortName\": \"G\",\n \"chi\": -84.36679807284759,\n \"glycosidicBond\": \"syn\"\n },\n {\n \"index\": 13,\n \"chain\": \"1\",\n \"number\": 13,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DT13\",\n \"shortName\": \"T\",\n \"chi\": -30.819029132834157,\n \"glycosidicBond\": \"syn\"\n },\n {\n \"index\": 14,\n \"chain\": \"1\",\n \"number\": 14,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DT14\",\n \"shortName\": \"T\",\n \"chi\": -168.51776782812965,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 15,\n \"chain\": \"1\",\n \"number\": 15,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DA15\",\n \"shortName\": \"A\",\n \"chi\": -105.72881577106517,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 16,\n \"chain\": \"1\",\n \"number\": 16,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DG16\",\n \"shortName\": \"G\",\n \"chi\": 74.3227942181243,\n \"glycosidicBond\": \"syn\"\n },\n {\n \"index\": 17,\n \"chain\": \"1\",\n \"number\": 17,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DG17\",\n \"shortName\": \"G\",\n \"chi\": 81.08424926936044,\n \"glycosidicBond\": \"syn\"\n },\n {\n \"index\": 18,\n \"chain\": \"1\",\n \"number\": 18,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DG18\",\n \"shortName\": \"G\",\n \"chi\": -122.90397217111551,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 19,\n \"chain\": \"1\",\n \"number\": 19,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DT19\",\n \"shortName\": \"T\",\n \"chi\": -102.98239337113938,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 20,\n \"chain\": \"1\",\n \"number\": 20,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DT20\",\n \"shortName\": \"T\",\n \"chi\": -112.1514601849715,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 21,\n \"chain\": \"1\",\n \"number\": 21,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DA21\",\n \"shortName\": \"A\",\n \"chi\": -89.07113063649612,\n \"glycosidicBond\": \"syn\"\n },\n {\n \"index\": 22,\n \"chain\": \"1\",\n \"number\": 22,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DG22\",\n \"shortName\": \"G\",\n \"chi\": 83.44318693001902,\n \"glycosidicBond\": \"syn\"\n },\n {\n \"index\": 23,\n \"chain\": \"1\",\n \"number\": 23,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DG23\",\n \"shortName\": \"G\",\n \"chi\": -115.41210237198398,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 24,\n \"chain\": \"1\",\n \"number\": 24,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DG24\",\n \"shortName\": \"G\",\n \"chi\": -111.14845782593531,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 25,\n \"chain\": \"1\",\n \"number\": 25,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DA25\",\n \"shortName\": \"A\",\n \"chi\": -58.323530637551954,\n \"glycosidicBond\": \"syn\"\n },\n {\n \"index\": 26,\n \"chain\": \"1\",\n \"number\": 26,\n \"icode\": null,\n \"molecule\": \"DNA\",\n \"fullName\": \"1.DA26\",\n \"shortName\": \"A\",\n \"chi\": -90.84065243137135,\n \"glycosidicBond\": \"anti\"\n }\n ],\n \"basePairs\": [\n {\n \"nt1\": \"1.DA3\",\n \"nt2\": \"1.DA21\",\n \"lw\": \"cHW\",\n \"inTetrad\": false,\n \"canonical\": false\n },\n {\n \"nt1\": \"1.DG4\",\n \"nt2\": \"1.DG10\",\n \"lw\": \"cHW\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"1.DG4\",\n \"nt2\": \"1.DG22\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"1.DG5\",\n \"nt2\": \"1.DG11\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"1.DG5\",\n \"nt2\": \"1.DG23\",\n \"lw\": \"cHW\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"1.DG6\",\n \"nt2\": \"1.DG12\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"1.DG6\",\n \"nt2\": \"1.DG24\",\n \"lw\": \"cHW\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"1.DG10\",\n \"nt2\": \"1.DG18\",\n \"lw\": \"cHW\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"1.DG11\",\n \"nt2\": \"1.DG17\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"1.DG12\",\n \"nt2\": \"1.DG16\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"1.DT14\",\n \"nt2\": \"1.DA25\",\n \"lw\": \"tWW\",\n \"inTetrad\": false,\n \"canonical\": false\n },\n {\n \"nt1\": \"1.DG16\",\n \"nt2\": \"1.DG24\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"1.DG17\",\n \"nt2\": \"1.DG23\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"1.DG18\",\n \"nt2\": \"1.DG22\",\n \"lw\": \"cHW\",\n \"inTetrad\": true,\n \"canonical\": false\n }\n ],\n \"helices\": [\n {\n \"quadruplexes\": [\n {\n \"tetrads\": [\n {\n \"id\": \"1.DG4-1.DG22-1.DG18-1.DG10\",\n \"nt1\": \"1.DG4\",\n \"nt2\": \"1.DG22\",\n \"nt3\": \"1.DG18\",\n \"nt4\": \"1.DG10\",\n \"onz\": \"O-\",\n \"gbaClassification\": \"Vb\",\n \"planarityDeviation\": 0.17372283960377805,\n \"ionsChannel\": [],\n \"ionsOutside\": []\n },\n {\n \"id\": \"1.DG5-1.DG23-1.DG17-1.DG11\",\n \"nt1\": \"1.DG5\",\n \"nt2\": \"1.DG23\",\n \"nt3\": \"1.DG17\",\n \"nt4\": \"1.DG11\",\n \"onz\": \"O+\",\n \"gbaClassification\": \"Va\",\n \"planarityDeviation\": 0.10474313820007483,\n \"ionsChannel\": [],\n \"ionsOutside\": []\n },\n {\n \"id\": \"1.DG6-1.DG24-1.DG16-1.DG12\",\n \"nt1\": \"1.DG6\",\n \"nt2\": \"1.DG24\",\n \"nt3\": \"1.DG16\",\n \"nt4\": \"1.DG12\",\n \"onz\": \"O+\",\n \"gbaClassification\": \"VIa\",\n \"planarityDeviation\": 0.18293509778060615,\n \"ionsChannel\": [],\n \"ionsOutside\": []\n }\n ],\n \"onzm\": \"Oh*\",\n \"loopClassification\": {\n \"classification\": \"9a\",\n \"loopProgression\": \"-(pll)\"\n },\n \"gbaClassification\": [\n \"V\",\n \"VI\"\n ],\n \"tracts\": [\n [\n \"1.DG4\",\n \"1.DG5\",\n \"1.DG6\"\n ],\n [\n \"1.DG22\",\n \"1.DG23\",\n \"1.DG24\"\n ],\n [\n \"1.DG18\",\n \"1.DG17\",\n \"1.DG16\"\n ],\n [\n \"1.DG10\",\n \"1.DG11\",\n \"1.DG12\"\n ]\n ],\n \"loops\": [\n {\n \"type\": \"propeller-\",\n \"nucleotides\": [\n \"1.DT7\",\n \"1.DT8\",\n \"1.DA9\"\n ]\n },\n {\n \"type\": \"lateral-\",\n \"nucleotides\": [\n \"1.DT13\",\n \"1.DT14\",\n \"1.DA15\"\n ]\n },\n {\n \"type\": \"lateral+\",\n \"nucleotides\": [\n \"1.DT19\",\n \"1.DT20\",\n \"1.DA21\"\n ]\n }\n ]\n }\n ],\n \"tetradPairs\": [\n {\n \"tetrad1\": \"1.DG4-1.DG22-1.DG18-1.DG10\",\n \"tetrad2\": \"1.DG5-1.DG23-1.DG17-1.DG11\",\n \"direction\": \"hybrid\",\n \"rise\": 3.2109650905140654,\n \"twist\": 16.228973729066034\n },\n {\n \"tetrad1\": \"1.DG5-1.DG23-1.DG17-1.DG11\",\n \"tetrad2\": \"1.DG6-1.DG24-1.DG16-1.DG12\",\n \"direction\": \"hybrid\",\n \"rise\": 3.1149939255558747,\n \"twist\": 27.448958336697046\n }\n ]\n }\n ],\n \"dotBracket\": {\n \"sequence\": \"AAAGGGTTAGGGTTAGGGTTAGGGAA\",\n \"line1\": \"...([{...(((...)))...)]}..\",\n \"line2\": \"...([{...)]}...(((...)))..\"\n }\n}\n```\n\n</details>\n\n## 4RJ1: Structural variations and solvent structure of UGGGGU quadruplexes stabilized by Sr2+ ions\n\n\n\n $ curl https://www.ebi.ac.uk/pdbe/static/entry/download/4rj1-assembly-1.cif.gz | gzip -d > 4rj1-1.cif\n $ ./eltetrado --input 4rj1-1.cif --output 4rj1-1.json\n\n Chain order: A AB AA AC B BC BA BB\n n4-helix with 10 tetrads\n Op* VIII n/a quadruplex with 5 tetrads\n A.U1006 AC.U1006 AA.U1006 AB.U1006 cWH cWH cWH cWH O- VIIIa planarity=1.06 ions_channel=NA ions_outside=A.U1006: [SR] AA.U1006: [SR] AB.U1006: [SR] AC.U1006: [SR]\n direction=parallel rise=3.37 twist=39.96\n A.G1005 AC.G1005 AA.G1005 AB.G1005 cHW cHW cHW cHW O+ VIIIa planarity=0.8 \n direction=parallel rise=3.31 twist=25.9\n A.G1004 AC.G1004 AA.G1004 AB.G1004 cHW cHW cHW cHW O+ VIIIa planarity=0.41 ions_channel=SR \n direction=parallel rise=3.34 twist=35.81\n A.G1003 AC.G1003 AA.G1003 AB.G1003 cHW cHW cHW cHW O+ VIIIa planarity=0.55 ions_channel=SR \n direction=parallel rise=3.29 twist=27.12\n A.G1002 AC.G1002 AA.G1002 AB.G1002 cHW cHW cHW cHW O+ VIIIa planarity=0.54 ions_outside=AB.G1002: [CA] AC.G1002: [CA] AA.G1002: [CA] A.G1002: [CA]\n\n Tracts:\n A.U1006, A.G1005, A.G1004, A.G1003, A.G1002\n AC.U1006, AC.G1005, AC.G1004, AC.G1003, AC.G1002\n AA.U1006, AA.G1005, AA.G1004, AA.G1003, AA.G1002\n AB.U1006, AB.G1005, AB.G1004, AB.G1003, AB.G1002\n\n Op* VIII n/a quadruplex with 5 tetrads\n B.G2002 BC.G2002 BA.G2002 BB.G2002 cWH cWH cWH cWH O+ VIIIa planarity=0.67 \n direction=parallel rise=3.37 twist=27.41\n B.G2003 BC.G2003 BA.G2003 BB.G2003 cWH cWH cWH cWH O+ VIIIa planarity=0.58 ions_channel=SR ions_outside=B.G2003: [CA] BA.G2003: [CA] BB.G2003: [CA] BC.G2003: [CA]\n direction=parallel rise=3.32 twist=35.04\n B.G2004 BC.G2004 BA.G2004 BB.G2004 cWH cWH cWH cWH O+ VIIIa planarity=0.23 ions_channel=SR \n direction=parallel rise=3.27 twist=25.15\n B.G2005 BC.G2005 BA.G2005 BB.G2005 cWH cWH cWH cWH O+ VIIIa planarity=0.78 ions_channel=NA \n direction=parallel rise=7.14 twist=43.41\n B.U2006 BC.U2006 BA.U2006 BB.U2006 cHW cHW cHW cHW O- VIIIa planarity=1.58 ions_channel=NA,NA \n\n Tracts:\n B.G2002, B.G2003, B.G2004, B.G2005, B.U2006\n BC.G2002, BC.G2003, BC.G2004, BC.G2005, BC.U2006\n BA.G2002, BA.G2003, BA.G2004, BA.G2005, BA.U2006\n BB.G2002, BB.G2003, BB.G2004, BB.G2005, BB.U2006\n\n UGGGGU-UGGGGU-UGGGGU-UGGGGU-UGGGGU-UGGGGU-UGGGGU-UGGGGU\n .([{<A-.([{<A-.)]}>a-.)]}>a-.([{<A-.)]}>a-.([{<A-.)]}>a\n .([{<A-.)]}>a-.([{<A-.)]}>a-.([{<A-.([{<A-.)]}>a-.)]}>a\n\n<details>\n<summary>\nClick to see the output JSON\n</summary>\n\n``` json\n{\n \"metals\": [\n {\n \"symbol\": \"Sr\",\n \"count\": 8\n },\n {\n \"symbol\": \"Na\",\n \"count\": 4\n },\n {\n \"symbol\": \"Ca\",\n \"count\": 12\n }\n ],\n \"nucleotides\": [\n {\n \"index\": 1,\n \"chain\": \"A\",\n \"number\": 1001,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"A.U1001\",\n \"shortName\": \"U\",\n \"chi\": -141.92671313255752,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 2,\n \"chain\": \"A\",\n \"number\": 1002,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"A.G1002\",\n \"shortName\": \"G\",\n \"chi\": -165.93034671112116,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 3,\n \"chain\": \"A\",\n \"number\": 1003,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"A.G1003\",\n \"shortName\": \"G\",\n \"chi\": -121.5652426033226,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 4,\n \"chain\": \"A\",\n \"number\": 1004,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"A.G1004\",\n \"shortName\": \"G\",\n \"chi\": -156.00957673923344,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 5,\n \"chain\": \"A\",\n \"number\": 1005,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"A.G1005\",\n \"shortName\": \"G\",\n \"chi\": -148.10051684016415,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 6,\n \"chain\": \"A\",\n \"number\": 1006,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"A.U1006\",\n \"shortName\": \"U\",\n \"chi\": -137.28005568139983,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 13,\n \"chain\": \"AA\",\n \"number\": 1001,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AA.U1001\",\n \"shortName\": \"U\",\n \"chi\": -141.9267131325575,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 14,\n \"chain\": \"AA\",\n \"number\": 1002,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AA.G1002\",\n \"shortName\": \"G\",\n \"chi\": -165.93034671112113,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 15,\n \"chain\": \"AA\",\n \"number\": 1003,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AA.G1003\",\n \"shortName\": \"G\",\n \"chi\": -121.56524260332266,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 16,\n \"chain\": \"AA\",\n \"number\": 1004,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AA.G1004\",\n \"shortName\": \"G\",\n \"chi\": -156.0095767392335,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 17,\n \"chain\": \"AA\",\n \"number\": 1005,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AA.G1005\",\n \"shortName\": \"G\",\n \"chi\": -148.10051684016406,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 18,\n \"chain\": \"AA\",\n \"number\": 1006,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AA.U1006\",\n \"shortName\": \"U\",\n \"chi\": -137.2800556813998,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 7,\n \"chain\": \"AB\",\n \"number\": 1001,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AB.U1001\",\n \"shortName\": \"U\",\n \"chi\": -141.9267131325574,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 8,\n \"chain\": \"AB\",\n \"number\": 1002,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AB.G1002\",\n \"shortName\": \"G\",\n \"chi\": -165.93034671112113,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 9,\n \"chain\": \"AB\",\n \"number\": 1003,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AB.G1003\",\n \"shortName\": \"G\",\n \"chi\": -121.56524260332266,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 10,\n \"chain\": \"AB\",\n \"number\": 1004,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AB.G1004\",\n \"shortName\": \"G\",\n \"chi\": -156.00957673923347,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 11,\n \"chain\": \"AB\",\n \"number\": 1005,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AB.G1005\",\n \"shortName\": \"G\",\n \"chi\": -148.10051684016406,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 12,\n \"chain\": \"AB\",\n \"number\": 1006,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AB.U1006\",\n \"shortName\": \"U\",\n \"chi\": -137.28005568139977,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 19,\n \"chain\": \"AC\",\n \"number\": 1001,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AC.U1001\",\n \"shortName\": \"U\",\n \"chi\": -141.92671313255747,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 20,\n \"chain\": \"AC\",\n \"number\": 1002,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AC.G1002\",\n \"shortName\": \"G\",\n \"chi\": -165.93034671112116,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 21,\n \"chain\": \"AC\",\n \"number\": 1003,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AC.G1003\",\n \"shortName\": \"G\",\n \"chi\": -121.56524260332266,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 22,\n \"chain\": \"AC\",\n \"number\": 1004,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AC.G1004\",\n \"shortName\": \"G\",\n \"chi\": -156.00957673923352,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 23,\n \"chain\": \"AC\",\n \"number\": 1005,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AC.G1005\",\n \"shortName\": \"G\",\n \"chi\": -148.1005168401641,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 24,\n \"chain\": \"AC\",\n \"number\": 1006,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"AC.U1006\",\n \"shortName\": \"U\",\n \"chi\": -137.28005568139986,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 25,\n \"chain\": \"B\",\n \"number\": 2001,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"B.U2001\",\n \"shortName\": \"U\",\n \"chi\": -146.4615316869476,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 26,\n \"chain\": \"B\",\n \"number\": 2002,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"B.G2002\",\n \"shortName\": \"G\",\n \"chi\": -170.79660912745996,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 27,\n \"chain\": \"B\",\n \"number\": 2003,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"B.G2003\",\n \"shortName\": \"G\",\n \"chi\": -117.68718110874113,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 28,\n \"chain\": \"B\",\n \"number\": 2004,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"B.G2004\",\n \"shortName\": \"G\",\n \"chi\": -153.88587375071324,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 29,\n \"chain\": \"B\",\n \"number\": 2005,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"B.G2005\",\n \"shortName\": \"G\",\n \"chi\": -148.8519912845669,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 30,\n \"chain\": \"B\",\n \"number\": 2006,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"B.U2006\",\n \"shortName\": \"U\",\n \"chi\": -159.43730655241544,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 37,\n \"chain\": \"BA\",\n \"number\": 2001,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BA.U2001\",\n \"shortName\": \"U\",\n \"chi\": -146.46153168694764,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 38,\n \"chain\": \"BA\",\n \"number\": 2002,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BA.G2002\",\n \"shortName\": \"G\",\n \"chi\": -170.79660912745993,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 39,\n \"chain\": \"BA\",\n \"number\": 2003,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BA.G2003\",\n \"shortName\": \"G\",\n \"chi\": -117.68718110874113,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 40,\n \"chain\": \"BA\",\n \"number\": 2004,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BA.G2004\",\n \"shortName\": \"G\",\n \"chi\": -153.88587375071322,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 41,\n \"chain\": \"BA\",\n \"number\": 2005,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BA.G2005\",\n \"shortName\": \"G\",\n \"chi\": -148.851991284567,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 42,\n \"chain\": \"BA\",\n \"number\": 2006,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BA.U2006\",\n \"shortName\": \"U\",\n \"chi\": -159.43730655241544,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 43,\n \"chain\": \"BB\",\n \"number\": 2001,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BB.U2001\",\n \"shortName\": \"U\",\n \"chi\": -146.4615316869476,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 44,\n \"chain\": \"BB\",\n \"number\": 2002,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BB.G2002\",\n \"shortName\": \"G\",\n \"chi\": -170.79660912745993,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 45,\n \"chain\": \"BB\",\n \"number\": 2003,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BB.G2003\",\n \"shortName\": \"G\",\n \"chi\": -117.68718110874106,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 46,\n \"chain\": \"BB\",\n \"number\": 2004,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BB.G2004\",\n \"shortName\": \"G\",\n \"chi\": -153.8858737507132,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 47,\n \"chain\": \"BB\",\n \"number\": 2005,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BB.G2005\",\n \"shortName\": \"G\",\n \"chi\": -148.85199128456696,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 48,\n \"chain\": \"BB\",\n \"number\": 2006,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BB.U2006\",\n \"shortName\": \"U\",\n \"chi\": -159.43730655241544,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 31,\n \"chain\": \"BC\",\n \"number\": 2001,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BC.U2001\",\n \"shortName\": \"U\",\n \"chi\": -146.4615316869476,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 32,\n \"chain\": \"BC\",\n \"number\": 2002,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BC.G2002\",\n \"shortName\": \"G\",\n \"chi\": -170.79660912745993,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 33,\n \"chain\": \"BC\",\n \"number\": 2003,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BC.G2003\",\n \"shortName\": \"G\",\n \"chi\": -117.68718110874121,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 34,\n \"chain\": \"BC\",\n \"number\": 2004,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BC.G2004\",\n \"shortName\": \"G\",\n \"chi\": -153.88587375071322,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 35,\n \"chain\": \"BC\",\n \"number\": 2005,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BC.G2005\",\n \"shortName\": \"G\",\n \"chi\": -148.85199128456694,\n \"glycosidicBond\": \"anti\"\n },\n {\n \"index\": 36,\n \"chain\": \"BC\",\n \"number\": 2006,\n \"icode\": null,\n \"molecule\": \"RNA\",\n \"fullName\": \"BC.U2006\",\n \"shortName\": \"U\",\n \"chi\": -159.43730655241544,\n \"glycosidicBond\": \"anti\"\n }\n ],\n \"basePairs\": [\n {\n \"nt1\": \"A.G1002\",\n \"nt2\": \"AB.G1002\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"A.G1002\",\n \"nt2\": \"AC.G1002\",\n \"lw\": \"cHW\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"A.G1003\",\n \"nt2\": \"AB.G1003\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"A.G1003\",\n \"nt2\": \"AC.G1003\",\n \"lw\": \"cHW\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"A.G1004\",\n \"nt2\": \"AB.G1004\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"A.G1004\",\n \"nt2\": \"AC.G1004\",\n \"lw\": \"cHW\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"A.G1005\",\n \"nt2\": \"AB.G1005\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"A.G1005\",\n \"nt2\": \"AC.G1005\",\n \"lw\": \"cHW\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"A.U1006\",\n \"nt2\": \"AB.U1006\",\n \"lw\": \"cHW\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"A.U1006\",\n \"nt2\": \"AC.U1006\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"AB.G1002\",\n \"nt2\": \"AA.G1002\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"AA.G1002\",\n \"nt2\": \"AC.G1002\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"AB.G1003\",\n \"nt2\": \"AA.G1003\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"AA.G1003\",\n \"nt2\": \"AC.G1003\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"AB.G1004\",\n \"nt2\": \"AA.G1004\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"AA.G1004\",\n \"nt2\": \"AC.G1004\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"AB.G1005\",\n \"nt2\": \"AA.G1005\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"AA.G1005\",\n \"nt2\": \"AC.G1005\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"AB.U1006\",\n \"nt2\": \"AA.U1006\",\n \"lw\": \"cHW\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"AA.U1006\",\n \"nt2\": \"AC.U1006\",\n \"lw\": \"cHW\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"B.G2002\",\n \"nt2\": \"BB.G2002\",\n \"lw\": \"cHW\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"B.G2002\",\n \"nt2\": \"BC.G2002\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"B.G2003\",\n \"nt2\": \"BB.G2003\",\n \"lw\": \"cHW\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"B.G2003\",\n \"nt2\": \"BC.G2003\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"B.G2004\",\n \"nt2\": \"BB.G2004\",\n \"lw\": \"cHW\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"B.G2004\",\n \"nt2\": \"BC.G2004\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"B.G2005\",\n \"nt2\": \"BB.G2005\",\n \"lw\": \"cHW\",\n \"inTetrad\": true,\n \"canonical\": false\n },\n {\n \"nt1\": \"B.G2005\",\n \"nt2\": \"BC.G2005\",\n \"lw\": \"cWH\",\n \"inTetrad\": true,\n \"canonical\": 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\"twist\": 25.149997949938147\n },\n {\n \"tetrad1\": \"B.G2005-BC.G2005-BA.G2005-BB.G2005\",\n \"tetrad2\": \"B.U2006-BC.U2006-BA.U2006-BB.U2006\",\n \"direction\": \"parallel\",\n \"rise\": 7.140499999999998,\n \"twist\": 43.40609492262336\n }\n ]\n }\n ],\n \"dotBracket\": {\n \"sequence\": \"UGGGGU-UGGGGU-UGGGGU-UGGGGU-UGGGGU-UGGGGU-UGGGGU-UGGGGU\",\n \"line1\": \".([{<A-.([{<A-.)]}>a-.)]}>a-.([{<A-.)]}>a-.([{<A-.)]}>a\",\n \"line2\": \".([{<A-.)]}>a-.([{<A-.)]}>a-.([{<A-.([{<A-.)]}>a-.)]}>a\"\n }\n}\n```\n\n</details>\n\n# Funding\n\nThis research was supported by the National Science Centre, Poland\n\\[2016/23/B/ST6/03931, 2019/35/B/ST6/03074\\] and Mloda Kadra project\n\\[09/91/SBAD/0684\\] from Poznan University of Technology, and carried\nout in the European Centre for Bioinformatics and Genomics (Poland). The\nauthors also acknowledge partial support by the statutory funds of\nPoznan University of Technology, Polish Ministry of Science and Higher\nEducation, and the Institute of Bioorganic Chemistry, PAS within\nintramural financing program.\n\n# Bibliography\n\n<div id=\"refs\" class=\"references csl-bib-body\">\n\n1. Topology-Based Classification of Tetrads and Quadruplex\n Structures. M. Popenda, J. Miskiewicz, J. Sarzynska, T. Zok, M.\n Szachniuk. *Bioinformatics*. 2020. 36(4):1129\u20131134.\n doi:[10.1093/bioinformatics/btz738](https://doi.org/10.1093/bioinformatics/btz738)\n\n2. ElTetrado: A Tool for Identification and Classification of Tetrads\n and Quadruplexes. T. Zok, M. Popenda, M. Szachniuk. *BMC\n Bioinformatics*. 2020. 21(1):40.\n doi:[10.1186/s12859-020-3385-1](https://doi.org/10.1186/s12859-020-3385-1)\n\n3. R-Chie : A Web Server and R Package for Visualizing RNA Secondary\n Structures. D. Lai, J.R. Proctor, J.Y.A. Zhu, I.M. Meyer. *Nucleic\n Acids Research*. 2012. 40(12):e95.\n doi:[f99845](https://doi.org/f99845)\n\n4. Geometric Nomenclature and Classification of RNA Base Pairs. N.B.\n Leontis, E. Westhof. *RNA*. 2001. 7(4):499\u2013512.\n doi:[10.1017/s1355838201002515](https://doi.org/10.1017/s1355838201002515)\n\n</div>\n",
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