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      "atom2_id": "///A/45/N12",
      "atom_pair": "O:N",
      "residue_pair": "nt:ligand"
    },
    {
      "index": 58,
      "atom1_serNum": 468,
      "atom2_serNum": 581,
      "donAcc_type": "standard",
      "distance": 2.620,
      "atom1_id": "///A/20/O2",
      "atom2_id": "///B/26/N2",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 59,
      "atom1_serNum": 469,
      "atom2_serNum": 579,
      "donAcc_type": "standard",
      "distance": 2.673,
      "atom1_id": "///A/20/N3",
      "atom2_id": "///B/26/N1",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 60,
      "atom1_serNum": 471,
      "atom2_serNum": 578,
      "donAcc_type": "standard",
      "distance": 2.639,
      "atom1_id": "///A/20/N4",
      "atom2_id": "///B/26/O6",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 61,
      "atom1_serNum": 491,
      "atom2_serNum": 558,
      "donAcc_type": "standard",
      "distance": 2.583,
      "atom1_id": "///A/21/O6",
      "atom2_id": "///B/25/N4",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 62,
      "atom1_serNum": 492,
      "atom2_serNum": 556,
      "donAcc_type": "standard",
      "distance": 2.743,
      "atom1_id": "///A/21/N1",
      "atom2_id": "///B/25/N3",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 63,
      "atom1_serNum": 494,
      "atom2_serNum": 555,
      "donAcc_type": "standard",
      "distance": 2.827,
      "atom1_id": "///A/21/N2",
      "atom2_id": "///B/25/O2",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 64,
      "atom1_serNum": 511,
      "atom2_serNum": 538,
      "donAcc_type": "standard",
      "distance": 2.913,
      "atom1_id": "///A/22/O2",
      "atom2_id": "///B/24/N2",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 65,
      "atom1_serNum": 512,
      "atom2_serNum": 536,
      "donAcc_type": "standard",
      "distance": 2.870,
      "atom1_id": "///A/22/N3",
      "atom2_id": "///B/24/N1",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 66,
      "atom1_serNum": 514,
      "atom2_serNum": 535,
      "donAcc_type": "standard",
      "distance": 2.726,
      "atom1_id": "///A/22/N4",
      "atom2_id": "///B/24/O6",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 67,
      "atom1_serNum": 563,
      "atom2_serNum": 995,
      "donAcc_type": "unknown",
      "distance": 2.904,
      "atom1_id": "///B/26/OP2",
      "atom2_id": "///A/45/N33",
      "atom_pair": "O:N",
      "residue_pair": "nt:ligand"
    },
    {
      "index": 68,
      "atom1_serNum": 575,
      "atom2_serNum": 995,
      "donAcc_type": "unknown",
      "distance": 2.878,
      "atom1_id": "///B/26/N7",
      "atom2_id": "///A/45/N33",
      "atom_pair": "N:N",
      "residue_pair": "nt:ligand"
    },
    {
      "index": 69,
      "atom1_serNum": 578,
      "atom2_serNum": 993,
      "donAcc_type": "acceptable",
      "distance": 2.732,
      "atom1_id": "///B/26/O6",
      "atom2_id": "///A/45/O23",
      "atom_pair": "O:O",
      "residue_pair": "nt:ligand"
    },
    {
      "index": 70,
      "atom1_serNum": 586,
      "atom2_serNum": 998,
      "donAcc_type": "acceptable",
      "distance": 2.839,
      "atom1_id": "///B/27/OP2",
      "atom2_id": "///A/45/O43",
      "atom_pair": "O:O",
      "residue_pair": "nt:ligand"
    },
    {
      "index": 71,
      "atom1_serNum": 621,
      "atom2_serNum": 1001,
      "donAcc_type": "standard",
      "distance": 2.926,
      "atom1_id": "///B/28/N4",
      "atom2_id": "///A/45/O53",
      "atom_pair": "N:O",
      "residue_pair": "nt:ligand"
    },
    {
      "index": 72,
      "atom1_serNum": 641,
      "atom2_serNum": 977,
      "donAcc_type": "standard",
      "distance": 3.121,
      "atom1_id": "///B/29/N6",
      "atom2_id": "///A/45/O51",
      "atom_pair": "N:O",
      "residue_pair": "nt:ligand"
    },
    {
      "index": 73,
      "atom1_serNum": 642,
      "atom2_serNum": 979,
      "donAcc_type": "acceptable",
      "distance": 2.845,
      "atom1_id": "///B/29/N1",
      "atom2_id": "///A/45/O61",
      "atom_pair": "N:O",
      "residue_pair": "nt:ligand"
    },
    {
      "index": 74,
      "atom1_serNum": 819,
      "atom2_serNum": 1007,
      "donAcc_type": "acceptable",
      "distance": 2.716,
      "atom1_id": "///B/38/OP2",
      "atom2_id": "///A/46/O31",
      "atom_pair": "O:O",
      "residue_pair": "nt:ligand"
    },
    {
      "index": 75,
      "atom1_serNum": 840,
      "atom2_serNum": 1019,
      "donAcc_type": "standard",
      "distance": 2.829,
      "atom1_id": "///B/39/OP1",
      "atom2_id": "///A/46/N32",
      "atom_pair": "O:N",
      "residue_pair": "nt:ligand"
    },
    {
      "index": 76,
      "atom1_serNum": 841,
      "atom2_serNum": 1009,
      "donAcc_type": "acceptable",
      "distance": 2.526,
      "atom1_id": "///B/39/OP2",
      "atom2_id": "///A/46/O41",
      "atom_pair": "O:O",
      "residue_pair": "nt:ligand"
    },
    {
      "index": 77,
      "atom1_serNum": 863,
      "atom2_serNum": 1019,
      "donAcc_type": "standard",
      "distance": 2.697,
      "atom1_id": "///B/40/OP2",
      "atom2_id": "///A/46/N32",
      "atom_pair": "O:N",
      "residue_pair": "nt:ligand"
    },
    {
      "index": 78,
      "atom1_serNum": 875,
      "atom2_serNum": 1019,
      "donAcc_type": "standard",
      "distance": 2.876,
      "atom1_id": "///B/40/N7",
      "atom2_id": "///A/46/N32",
      "atom_pair": "N:N",
      "residue_pair": "nt:ligand"
    },
    {
      "index": 79,
      "atom1_serNum": 878,
      "atom2_serNum": 1022,
      "donAcc_type": "acceptable",
      "distance": 3.728,
      "atom1_id": "///B/40/O6",
      "atom2_id": "///A/46/O52",
      "atom_pair": "O:O",
      "residue_pair": "nt:ligand"
    },
    {
      "index": 80,
      "atom1_serNum": 894,
      "atom2_serNum": 910,
      "donAcc_type": "acceptable",
      "distance": 2.977,
      "atom1_id": "///B/41/O2'",
      "atom2_id": "///B/42/O4'",
      "atom_pair": "O:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 81,
      "atom1_serNum": 901,
      "atom2_serNum": 1016,
      "donAcc_type": "standard",
      "distance": 2.672,
      "atom1_id": "///B/41/O4",
      "atom2_id": "///A/46/N12",
      "atom_pair": "O:N",
      "residue_pair": "nt:ligand"
    },
    {
      "index": 82,
      "atom1_serNum": 982,
      "atom2_serNum": 993,
      "donAcc_type": "acceptable",
      "distance": 3.146,
      "atom1_id": "///A/45/N12",
      "atom2_id": "///A/45/O23",
      "atom_pair": "N:O",
      "residue_pair": "ligand:ligand"
    },
    {
      "index": 83,
      "atom1_serNum": 1016,
      "atom2_serNum": 1027,
      "donAcc_type": "acceptable",
      "distance": 3.076,
      "atom1_id": "///A/46/N12",
      "atom2_id": "///A/46/O23",
      "atom_pair": "N:O",
      "residue_pair": "ligand:ligand"
    }
  ],
  "refCoords": {
    "purine": [
      "   12 ATOMS,    12 BONDS",
      "    1 N      -2.2500   5.0000   0.4000",
      "    2 N      -2.2500  -0.5000   0.4000",
      "    3 N      -2.2500  -0.5000  -0.4000",
      "    4 N      -2.2500   5.0000  -0.4000",
      "    5 C       1.2500   5.0000   0.4000",
      "    6 C       1.2500  -0.5000   0.4000",
      "    7 C       1.2500  -0.5000  -0.4000",
      "    8 C       1.2500   5.0000  -0.4000",
      "    9 C      -2.2500   5.0000   0.4000",
      "   10 C      -2.2500  -0.5000   0.4000",
      "   11 C      -2.2500  -0.5000  -0.4000",
      "   12 C      -2.2500   5.0000  -0.4000",
      "    1     1     2",
      "    2     2     3",
      "    3     3     4",
      "    4     4     1",
      "    5     5     6",
      "    6     6     7",
      "    7     7     8",
      "    8     5     8",
      "    9     9     5",
      "   10    10     6",
      "   11    11     7",
      "   12    12     8"
    ],
    "pyrimidine": [
      "   12 ATOMS,    12 BONDS",
      "    1 N      -2.2500   5.0000   0.4000",
      "    2 N      -2.2500   1.0000   0.4000",
      "    3 N      -2.2500   1.0000  -0.4000",
      "    4 N      -2.2500   5.0000  -0.4000",
      "    5 C       1.2500   5.0000   0.4000",
      "    6 C       1.2500   1.0000   0.4000",
      "    7 C       1.2500   1.0000  -0.4000",
      "    8 C       1.2500   5.0000  -0.4000",
      "    9 C      -2.2500   5.0000   0.4000",
      "   10 C      -2.2500   1.0000   0.4000",
      "   11 C      -2.2500   1.0000  -0.4000",
      "   12 C      -2.2500   5.0000  -0.4000",
      "    1     1     2",
      "    2     2     3",
      "    3     3     4",
      "    4     4     1",
      "    5     5     6",
      "    6     6     7",
      "    7     7     8",
      "    8     5     8",
      "    9     9     5",
      "   10    10     6",
      "   11    11     7",
      "   12    12     8"
    ],
    "wc_pair": [
      "   12 ATOMS,    12 BONDS",
      "    1 N      -2.2500   5.0000   0.4000",
      "    2 N      -2.2500  -5.0000   0.4000",
      "    3 N      -2.2500  -5.0000  -0.4000",
      "    4 N      -2.2500   5.0000  -0.4000",
      "    5 C       2.2500   5.0000   0.4000",
      "    6 C       2.2500  -5.0000   0.4000",
      "    7 C       2.2500  -5.0000  -0.4000",
      "    8 C       2.2500   5.0000  -0.4000",
      "    9 C      -2.2500   5.0000   0.4000",
      "   10 C      -2.2500  -5.0000   0.4000",
      "   11 C      -2.2500  -5.0000  -0.4000",
      "   12 C      -2.2500   5.0000  -0.4000",
      "    1     1     2",
      "    2     2     3",
      "    3     3     4",
      "    4     4     1",
      "    5     5     6",
      "    6     6     7",
      "    7     7     8",
      "    8     5     8",
      "    9     9     5",
      "   10    10     6",
      "   11    11     7",
      "   12    12     8"
    ]
  },
  "metadata": {
    "license": "http://innovation.columbia.edu/technologies/CU20391",
    "url": "http://x3dna.org/",
    "url_alt": "http://home.x3dna.org/",
    "forum": "http://forum.x3dna.org/",
    "citation": "Lu et al. (2015). 'DSSR: an integrated software tool for dissecting the spatial structure of RNA.' Nucleic Acids Res., 43(21):e142 [doi:10.1093/nar/gkv716].",
    "str_id": "1mwl",
    "num_naChains": 2,
    "naChains": "A=21,B=21",
    "num_atoms": 1005,
    "num_waters": 39,
    "num_notes": 52,
    "notes": [
      {
        "Aminors": "A-minor interactions (including types I and II)"
      },
      {
        "Cstem_index": "stem index of the 'Canonical' helix in k-turn"
      },
      {
        "Cstem_pair": "Cstem bp delineating the k-turn internal loop"
      },
      {
        "Dp": "perpendicular distance of the 3' P atom to the glycosidic bond"
      },
      {
        "GA_pair": "sheared G-A pair in k-turn"
      },
      {
        "HtypePknot": "H-type pseudoknot"
      },
      {
        "Kturn": "kink-turn (k-turn)"
      },
      {
        "LW": "Leontis-Westhof"
      },
      {
        "NCstem_index": "stem index of the 'Non-Canonical' helix in k-turn"
      },
      {
        "NCstem_pair": "NCstem bp delineating the k-turn internal loop"
      },
      {
        "Uturn": "U-turn of the UNR- or GNRA-type"
      },
      {
        "aa": "amino acid"
      },
      {
        "atom_pair": "symbols of the two atoms involved in an H-bond"
      },
      {
        "auxfiles": "auxiliary files"
      },
      {
        "glyco_bond": "conformation of base related to sugar (syn or anti)"
      },
      {
        "bb_type": "backbone conformation, BI or BII"
      },
      {
        "bending_angle": "angle between two helical axes"
      },
      {
        "bp": "base pair"
      },
      {
        "bseq": "base sequence in one-letter code"
      },
      {
        "bulge": "bulge loop"
      },
      {
        "coaxStacks": "coaxial stacking of stems within a helix"
      },
      {
        "dbn": "dot bracket notation"
      },
      {
        "desc": "description"
      },
      {
        "donAcc_type": "donor/acceptor type of the atom pair in an H-bond"
      },
      {
        "epsilon_zeta": "difference between epsilon and zeta torsion angles"
      },
      {
        "hairpin": "hairpin loop"
      },
      {
        "hbond": "hydrogen bond (H-bond)"
      },
      {
        "helix": "defined by base-stacking interactions, regardless of bp type and backbone connectivity"
      },
      {
        "id": "identifier"
      },
      {
        "iloop": "internal loop"
      },
      {
        "index": "serial number"
      },
      {
        "isoCanonPairs": "isolated canonical pairs"
      },
      {
        "junction": "(multi-branched) junction loop"
      },
      {
        "kissingLoop": "kissing loop"
      },
      {
        "multiplet": "3+ bases in a coplanar geometry"
      },
      {
        "na": "nucleic acid"
      },
      {
        "nonPair": "two nts not forming a pair, but with H-bonding/stacking interactions"
      },
      {
        "nonStack": "nucleotide not involved in stacking interactions"
      },
      {
        "nt": "nucleotide"
      },
      {
        "num": "number"
      },
      {
        "oArea": "overlap areas between two bases, including exocyclic atoms"
      },
      {
        "oArea_ring": "overlap areas between two bases, including only ring atoms"
      },
      {
        "phosContacts": "H-bonding and atom-capping interactions involving a phosphate"
      },
      {
        "residue_pair": "types of the two residues involved in an H-bond"
      },
      {
        "rmsd": "root-mean-squares deviation"
      },
      {
        "serNum": "serial number"
      },
      {
        "ssSegments": "single-stranded segments not involved in loops"
      },
      {
        "ssZp": "Z-coordinate of the 3' phosphorus atom with reference to the 5' base plane"
      },
      {
        "sstr": "secondary structure in dbn"
      },
      {
        "stem": "helix consisting of only canonical pairs, with a continuous backbone"
      },
      {
        "str_id": "structure identifier, derived from inpfile with extension removed"
      },
      {
        "vert_dist": "vertical distance from an atom to a base plane"
      }
    ],
    "num_auxfiles": 15,
    "auxfiles": [
      {
        "index": 1,
        "name": "dssr-pairs.pdb",
        "desc": "an ensemble of base pairs"
      },
      {
        "index": 2,
        "name": "dssr-stems.pdb",
        "desc": "an ensemble of stems"
      },
      {
        "index": 3,
        "name": "dssr-helices.pdb",
        "desc": "an ensemble of helices (coaxial stacking)"
      },
      {
        "index": 4,
        "name": "dssr-iloops.pdb",
        "desc": "an ensemble of internal loops"
      },
      {
        "index": 5,
        "name": "dssr-2ndstrs.bpseq",
        "desc": "secondary structure in bpseq format"
      },
      {
        "index": 6,
        "name": "dssr-2ndstrs.ct",
        "desc": "secondary structure in connectivity table format"
      },
      {
        "index": 7,
        "name": "dssr-2ndstrs.dbn",
        "desc": "secondary structure in dot-bracket notation"
      },
      {
        "index": 8,
        "name": "dssr-torsions.txt",
        "desc": "backbone torsion angles and suite names"
      },
      {
        "index": 9,
        "name": "dssr-splays.pdb",
        "desc": "an ensemble of splayed-apart units"
      },
      {
        "index": 10,
        "name": "dssr-stacks.pdb",
        "desc": "an ensemble of base stacks"
      },
      {
        "index": 11,
        "name": "dssr-atom2bases.pdb",
        "desc": "an ensemble of atom-base stacking interactions"
      },
      {
        "index": 12,
        "name": "dssr-rotmat.txt",
        "desc": "position vector and rotation matrix"
      },
      {
        "index": 13,
        "name": "dssr-viewV.pdb",
        "desc": "vertical view of the principal moment of inertia"
      },
      {
        "index": 14,
        "name": "dssr-viewH.pdb",
        "desc": "horizontal view of the principal moment of inertia"
      },
      {
        "index": 15,
        "name": "dssr-viewT.pdb",
        "desc": "top view of the principal moment of inertia"
      }
    ],
    "time_used": "999"
  }
}
