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          -0.433
        ],
        "z_axis": [
          -0.708,
          -0.161,
          0.687
        ],
        "quaternion": [
          0.189,
          -0.359,
          -0.165,
          0.899
        ]
      }
    },
    {
      "index": 20,
      "index_chain": 10,
      "chain_name": "B",
      "nt_resnum": 20,
      "nt_name": "DC",
      "nt_code": "C",
      "nt_id": "///B/20",
      "linked_nts": [
        "///B/19",
        null
      ],
      "nt_type": "DNA",
      "dbn": ")",
      "summary": "anti,~C2'-endo,canonical,non-pair-contact,helix-end,stem-end",
      "alpha": -65.423,
      "beta": -172.574,
      "gamma": 55.902,
      "delta": 136.684,
      "epsilon": null,
      "zeta": null,
      "epsilon_zeta": null,
      "bb_type": "--",
      "chi": -126.652,
      "glyco_bond": "anti",
      "C5prime_xyz": [
        -1.925,
        8.720,
        -0.980
      ],
      "P_xyz": [
        0.362,
        9.674,
        -0.176
      ],
      "form": "-",
      "ssZp": null,
      "Dp": null,
      "splay_angle": null,
      "splay_distance": null,
      "splay_ratio": null,
      "d22": null,
      "d64": null,
      "eta": null,
      "theta": null,
      "eta_prime": null,
      "theta_prime": null,
      "eta_base": null,
      "theta_base": null,
      "v0": -24.729,
      "v1": 34.309,
      "v2": -30.405,
      "v3": 17.028,
      "v4": 4.609,
      "amplitude": 33.970,
      "phase_angle": 153.517,
      "puckering": "C2'-endo",
      "sugar_class": "~C2'-endo",
      "bin": "32p",
      "cluster": "1b",
      "suiteness": 0.424,
      "filter_rmsd": 0.063,
      "frame": {
        "rmsd": 0.003,
        "origin": [
          -9.753,
          -3.471,
          20.085
        ],
        "x_axis": [
          -0.593,
          0.002,
          -0.805
        ],
        "y_axis": [
          -0.016,
          -1.000,
          0.009
        ],
        "z_axis": [
          -0.805,
          0.018,
          0.593
        ],
        "quaternion": [
          0.005,
          -0.451,
          0.008,
          0.893
        ]
      }
    }
  ],
  "num_hbonds": 30,
  "hbonds": [
    {
      "index": 1,
      "atom1_serNum": 14,
      "atom2_serNum": 423,
      "donAcc_type": "standard",
      "distance": 2.909,
      "atom1_id": "///A/1/O6",
      "atom2_id": "///B/20/N4",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 2,
      "atom1_serNum": 15,
      "atom2_serNum": 421,
      "donAcc_type": "standard",
      "distance": 3.019,
      "atom1_id": "///A/1/N1",
      "atom2_id": "///B/20/N3",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 3,
      "atom1_serNum": 17,
      "atom2_serNum": 420,
      "donAcc_type": "standard",
      "distance": 2.988,
      "atom1_id": "///A/1/N2",
      "atom2_id": "///B/20/O2",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 4,
      "atom1_serNum": 33,
      "atom2_serNum": 404,
      "donAcc_type": "standard",
      "distance": 2.700,
      "atom1_id": "///A/2/O2",
      "atom2_id": "///B/19/N2",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 5,
      "atom1_serNum": 34,
      "atom2_serNum": 402,
      "donAcc_type": "standard",
      "distance": 2.944,
      "atom1_id": "///A/2/N3",
      "atom2_id": "///B/19/N1",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 6,
      "atom1_serNum": 36,
      "atom2_serNum": 401,
      "donAcc_type": "standard",
      "distance": 3.103,
      "atom1_id": "///A/2/N4",
      "atom2_id": "///B/19/O6",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 7,
      "atom1_serNum": 55,
      "atom2_serNum": 382,
      "donAcc_type": "standard",
      "distance": 3.170,
      "atom1_id": "///A/3/O6",
      "atom2_id": "///B/18/N4",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 8,
      "atom1_serNum": 56,
      "atom2_serNum": 380,
      "donAcc_type": "standard",
      "distance": 2.945,
      "atom1_id": "///A/3/N1",
      "atom2_id": "///B/18/N3",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 9,
      "atom1_serNum": 58,
      "atom2_serNum": 379,
      "donAcc_type": "standard",
      "distance": 2.687,
      "atom1_id": "///A/3/N2",
      "atom2_id": "///B/18/O2",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 10,
      "atom1_serNum": 75,
      "atom2_serNum": 362,
      "donAcc_type": "standard",
      "distance": 2.795,
      "atom1_id": "///A/4/N3",
      "atom2_id": "///B/17/N1",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 11,
      "atom1_serNum": 77,
      "atom2_serNum": 361,
      "donAcc_type": "standard",
      "distance": 3.195,
      "atom1_id": "///A/4/O4",
      "atom2_id": "///B/17/N6",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 12,
      "atom1_serNum": 97,
      "atom2_serNum": 337,
      "donAcc_type": "standard",
      "distance": 3.254,
      "atom1_id": "///A/5/N6",
      "atom2_id": "///B/16/O4",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 13,
      "atom1_serNum": 97,
      "atom2_serNum": 430,
      "donAcc_type": "acceptable",
      "distance": 3.844,
      "atom1_id": "///A/5/N6",
      "atom2_id": "///B/101/O1",
      "atom_pair": "N:O",
      "residue_pair": "nt:ligand"
    },
    {
      "index": 14,
      "atom1_serNum": 98,
      "atom2_serNum": 320,
      "donAcc_type": "standard",
      "distance": 2.687,
      "atom1_id": "///A/5/N1",
      "atom2_id": "///B/16/N3",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 15,
      "atom1_serNum": 107,
      "atom2_serNum": 311,
      "donAcc_type": "standard",
      "distance": 2.736,
      "atom1_id": "///A/6/N3",
      "atom2_id": "///B/15/N1",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 16,
      "atom1_serNum": 124,
      "atom2_serNum": 310,
      "donAcc_type": "standard",
      "distance": 2.903,
      "atom1_id": "///A/6/O4",
      "atom2_id": "///B/15/N6",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 17,
      "atom1_serNum": 148,
      "atom2_serNum": 290,
      "donAcc_type": "standard",
      "distance": 2.927,
      "atom1_id": "///A/7/N6",
      "atom2_id": "///B/14/O4",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 18,
      "atom1_serNum": 149,
      "atom2_serNum": 288,
      "donAcc_type": "standard",
      "distance": 2.781,
      "atom1_id": "///A/7/N1",
      "atom2_id": "///B/14/N3",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 19,
      "atom1_serNum": 166,
      "atom2_serNum": 271,
      "donAcc_type": "standard",
      "distance": 2.683,
      "atom1_id": "///A/8/O2",
      "atom2_id": "///B/13/N2",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 20,
      "atom1_serNum": 167,
      "atom2_serNum": 269,
      "donAcc_type": "standard",
      "distance": 2.935,
      "atom1_id": "///A/8/N3",
      "atom2_id": "///B/13/N1",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 21,
      "atom1_serNum": 169,
      "atom2_serNum": 268,
      "donAcc_type": "standard",
      "distance": 3.175,
      "atom1_id": "///A/8/N4",
      "atom2_id": "///B/13/O6",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 22,
      "atom1_serNum": 188,
      "atom2_serNum": 249,
      "donAcc_type": "standard",
      "distance": 2.910,
      "atom1_id": "///A/9/O6",
      "atom2_id": "///B/12/N4",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 23,
      "atom1_serNum": 189,
      "atom2_serNum": 247,
      "donAcc_type": "standard",
      "distance": 2.747,
      "atom1_id": "///A/9/N1",
      "atom2_id": "///B/12/N3",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 24,
      "atom1_serNum": 191,
      "atom2_serNum": 246,
      "donAcc_type": "standard",
      "distance": 2.505,
      "atom1_id": "///A/9/N2",
      "atom2_id": "///B/12/O2",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 25,
      "atom1_serNum": 207,
      "atom2_serNum": 230,
      "donAcc_type": "standard",
      "distance": 2.537,
      "atom1_id": "///A/10/O2",
      "atom2_id": "///B/11/N2",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 26,
      "atom1_serNum": 208,
      "atom2_serNum": 228,
      "donAcc_type": "standard",
      "distance": 2.737,
      "atom1_id": "///A/10/N3",
      "atom2_id": "///B/11/N1",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 27,
      "atom1_serNum": 210,
      "atom2_serNum": 227,
      "donAcc_type": "standard",
      "distance": 2.821,
      "atom1_id": "///A/10/N4",
      "atom2_id": "///B/11/O6",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 28,
      "atom1_serNum": 310,
      "atom2_serNum": 431,
      "donAcc_type": "acceptable",
      "distance": 3.421,
      "atom1_id": "///B/15/N6",
      "atom2_id": "///B/101/O2",
      "atom_pair": "N:O",
      "residue_pair": "nt:ligand"
    },
    {
      "index": 29,
      "atom1_serNum": 334,
      "atom2_serNum": 351,
      "donAcc_type": "unknown",
      "distance": 3.140,
      "atom1_id": "///B/16/N4'",
      "atom2_id": "///B/17/O4'",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 30,
      "atom1_serNum": 337,
      "atom2_serNum": 431,
      "donAcc_type": "acceptable",
      "distance": 2.560,
      "atom1_id": "///B/16/O4",
      "atom2_id": "///B/101/O2",
      "atom_pair": "O:O",
      "residue_pair": "nt: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": "8his",
    "num_naChains": 2,
    "naChains": "A=10,B=10",
    "num_atoms": 520,
    "num_waters": 91,
    "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": 11,
    "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-2ndstrs.bpseq",
        "desc": "secondary structure in bpseq format"
      },
      {
        "index": 5,
        "name": "dssr-2ndstrs.ct",
        "desc": "secondary structure in connectivity table format"
      },
      {
        "index": 6,
        "name": "dssr-2ndstrs.dbn",
        "desc": "secondary structure in dot-bracket notation"
      },
      {
        "index": 7,
        "name": "dssr-torsions.txt",
        "desc": "backbone torsion angles and suite names"
      },
      {
        "index": 8,
        "name": "dssr-rotmat.txt",
        "desc": "position vector and rotation matrix"
      },
      {
        "index": 9,
        "name": "dssr-viewV.pdb",
        "desc": "vertical view of the principal moment of inertia"
      },
      {
        "index": 10,
        "name": "dssr-viewH.pdb",
        "desc": "horizontal view of the principal moment of inertia"
      },
      {
        "index": 11,
        "name": "dssr-viewT.pdb",
        "desc": "top view of the principal moment of inertia"
      }
    ],
    "time_used": "999"
  }
}