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      "atom1_id": "///A/204/NH2",
      "atom2_id": "///A/502/O4",
      "atom_pair": "N:O",
      "residue_pair": "aa:ligand"
    },
    {
      "index": 194,
      "atom1_serNum": 1527,
      "atom2_serNum": 1542,
      "donAcc_type": "acceptable",
      "distance": 2.663,
      "atom1_id": "///A/206/OD1",
      "atom2_id": "///A/208/OG1",
      "atom_pair": "O:O",
      "residue_pair": "aa:aa"
    },
    {
      "index": 195,
      "atom1_serNum": 1565,
      "atom2_serNum": 2407,
      "donAcc_type": "standard",
      "distance": 2.865,
      "atom1_id": "///A/210/NH2",
      "atom2_id": "///A/502/O2",
      "atom_pair": "N:O",
      "residue_pair": "aa:ligand"
    },
    {
      "index": 196,
      "atom1_serNum": 1573,
      "atom2_serNum": 1583,
      "donAcc_type": "questionable",
      "distance": 3.120,
      "atom1_id": "///A/211/OE1",
      "atom2_id": "///A/213/O",
      "atom_pair": "O:O",
      "residue_pair": "aa:aa"
    },
    {
      "index": 197,
      "atom1_serNum": 1644,
      "atom2_serNum": 2395,
      "donAcc_type": "standard",
      "distance": 3.350,
      "atom1_id": "///B/2/N6",
      "atom2_id": "///C/13/O4",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 198,
      "atom1_serNum": 1646,
      "atom2_serNum": 2391,
      "donAcc_type": "standard",
      "distance": 2.834,
      "atom1_id": "///B/2/N1",
      "atom2_id": "///C/13/N3",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 199,
      "atom1_serNum": 1686,
      "atom2_serNum": 2357,
      "donAcc_type": "standard",
      "distance": 3.186,
      "atom1_id": "///B/3/O6",
      "atom2_id": "///C/12/N4",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 200,
      "atom1_serNum": 1688,
      "atom2_serNum": 2353,
      "donAcc_type": "standard",
      "distance": 3.045,
      "atom1_id": "///B/3/N1",
      "atom2_id": "///C/12/N3",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 201,
      "atom1_serNum": 1692,
      "atom2_serNum": 2351,
      "donAcc_type": "standard",
      "distance": 2.876,
      "atom1_id": "///B/3/N2",
      "atom2_id": "///C/12/O2",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 202,
      "atom1_serNum": 1692,
      "atom2_serNum": 2389,
      "donAcc_type": "standard",
      "distance": 3.264,
      "atom1_id": "///B/3/N2",
      "atom2_id": "///C/13/O2",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 203,
      "atom1_serNum": 1730,
      "atom2_serNum": 2319,
      "donAcc_type": "standard",
      "distance": 3.390,
      "atom1_id": "///B/4/O6",
      "atom2_id": "///C/11/N4",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 204,
      "atom1_serNum": 1732,
      "atom2_serNum": 2315,
      "donAcc_type": "standard",
      "distance": 3.199,
      "atom1_id": "///B/4/N1",
      "atom2_id": "///C/11/N3",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 205,
      "atom1_serNum": 1736,
      "atom2_serNum": 2313,
      "donAcc_type": "standard",
      "distance": 2.915,
      "atom1_id": "///B/4/N2",
      "atom2_id": "///C/11/O2",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 206,
      "atom1_serNum": 1770,
      "atom2_serNum": 2279,
      "donAcc_type": "standard",
      "distance": 2.846,
      "atom1_id": "///B/5/N3",
      "atom2_id": "///C/10/N1",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 207,
      "atom1_serNum": 1774,
      "atom2_serNum": 2237,
      "donAcc_type": "questionable",
      "distance": 3.178,
      "atom1_id": "///B/5/O4",
      "atom2_id": "///C/9/O4",
      "atom_pair": "O:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 208,
      "atom1_serNum": 1774,
      "atom2_serNum": 2277,
      "donAcc_type": "standard",
      "distance": 3.223,
      "atom1_id": "///B/5/O4",
      "atom2_id": "///C/10/N6",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 209,
      "atom1_serNum": 1816,
      "atom2_serNum": 2233,
      "donAcc_type": "standard",
      "distance": 2.782,
      "atom1_id": "///B/6/N1",
      "atom2_id": "///C/9/N3",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 210,
      "atom1_serNum": 1850,
      "atom2_serNum": 2164,
      "donAcc_type": "standard",
      "distance": 2.885,
      "atom1_id": "///B/7/N7",
      "atom2_id": "///C/7/N6",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 211,
      "atom1_serNum": 1856,
      "atom2_serNum": 2166,
      "donAcc_type": "standard",
      "distance": 2.807,
      "atom1_id": "///B/7/N6",
      "atom2_id": "///C/7/N1",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 212,
      "atom1_serNum": 1904,
      "atom2_serNum": 2124,
      "donAcc_type": "standard",
      "distance": 3.412,
      "atom1_id": "///B/9/N6",
      "atom2_id": "///C/6/O4",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 213,
      "atom1_serNum": 1905,
      "atom2_serNum": 2120,
      "donAcc_type": "standard",
      "distance": 2.886,
      "atom1_id": "///B/9/N1",
      "atom2_id": "///C/6/N3",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 214,
      "atom1_serNum": 1923,
      "atom2_serNum": 2088,
      "donAcc_type": "standard",
      "distance": 2.876,
      "atom1_id": "///B/10/N3",
      "atom2_id": "///C/5/N1",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 215,
      "atom1_serNum": 1925,
      "atom2_serNum": 2087,
      "donAcc_type": "standard",
      "distance": 2.976,
      "atom1_id": "///B/10/O4",
      "atom2_id": "///C/5/N6",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 216,
      "atom1_serNum": 1942,
      "atom2_serNum": 2068,
      "donAcc_type": "standard",
      "distance": 2.779,
      "atom1_id": "///B/11/O2",
      "atom2_id": "///C/4/N2",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 217,
      "atom1_serNum": 1943,
      "atom2_serNum": 2066,
      "donAcc_type": "standard",
      "distance": 2.844,
      "atom1_id": "///B/11/N3",
      "atom2_id": "///C/4/N1",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 218,
      "atom1_serNum": 1945,
      "atom2_serNum": 2065,
      "donAcc_type": "standard",
      "distance": 2.850,
      "atom1_id": "///B/11/N4",
      "atom2_id": "///C/4/O6",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 219,
      "atom1_serNum": 1964,
      "atom2_serNum": 2046,
      "donAcc_type": "standard",
      "distance": 2.942,
      "atom1_id": "///B/12/O6",
      "atom2_id": "///C/3/N4",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 220,
      "atom1_serNum": 1965,
      "atom2_serNum": 2044,
      "donAcc_type": "standard",
      "distance": 2.848,
      "atom1_id": "///B/12/N1",
      "atom2_id": "///C/3/N3",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 221,
      "atom1_serNum": 1967,
      "atom2_serNum": 2043,
      "donAcc_type": "standard",
      "distance": 2.663,
      "atom1_id": "///B/12/N2",
      "atom2_id": "///C/3/O2",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 222,
      "atom1_serNum": 1984,
      "atom2_serNum": 2026,
      "donAcc_type": "standard",
      "distance": 2.782,
      "atom1_id": "///B/13/N3",
      "atom2_id": "///C/2/N1",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 223,
      "atom1_serNum": 1986,
      "atom2_serNum": 2025,
      "donAcc_type": "standard",
      "distance": 2.984,
      "atom1_id": "///B/13/O4",
      "atom2_id": "///C/2/N6",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    }
  ],
  "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": "3bkz",
    "num_aaChains": 1,
    "aaChains": "A=201",
    "num_naChains": 2,
    "naChains": "B=13,C=13",
    "num_atoms": 2402,
    "num_waters": 292,
    "num_metals": 1,
    "metals_desc": "Mn=1",
    "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"
  }
}