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      "zeta": -89.702,
      "epsilon_zeta": -98.355,
      "bb_type": "BI",
      "chi": -127.763,
      "glyco_bond": "anti",
      "C5prime_xyz": [
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      "P_xyz": [
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        -0.663
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      "form": ".",
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      "Dp": 2.334,
      "splay_angle": 18.761,
      "splay_distance": 3.990,
      "splay_ratio": 0.195,
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      "d64": null,
      "eta": 167.147,
      "theta": -130.479,
      "eta_prime": -172.845,
      "theta_prime": -151.017,
      "eta_base": -137.601,
      "theta_base": -125.271,
      "v0": -36.322,
      "v1": 43.431,
      "v2": -33.213,
      "v3": 14.349,
      "v4": 12.981,
      "amplitude": 41.854,
      "phase_angle": 142.518,
      "puckering": "C1'-exo",
      "sugar_class": "~C2'-endo",
      "bin": "22p",
      "cluster": "!!",
      "suiteness": 0.000,
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      "frame": {
        "rmsd": 0.067,
        "origin": [
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        "x_axis": [
          -0.467,
          -0.126,
          -0.875
        ],
        "y_axis": [
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        ],
        "z_axis": [
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        ],
        "quaternion": [
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          0.610
        ]
      }
    },
    {
      "index": 26,
      "index_chain": 13,
      "chain_name": "B",
      "nt_resnum": 26,
      "nt_name": "DG",
      "nt_code": "G",
      "nt_id": "///B/26",
      "linked_nts": [
        "///B/25",
        null
      ],
      "nt_type": "DNA",
      "dbn": ")",
      "summary": "anti,~C2'-endo,canonical,non-pair-contact,helix-end,stem-end,coaxial-stack",
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      "beta": -175.288,
      "gamma": 172.642,
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      "zeta": null,
      "epsilon_zeta": null,
      "bb_type": "--",
      "chi": -146.657,
      "glyco_bond": "anti",
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      "P_xyz": [
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        11.006,
        -1.512
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      "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": -41.485,
      "v1": 45.374,
      "v2": -31.588,
      "v3": 7.776,
      "v4": 21.706,
      "amplitude": 45.500,
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      "puckering": "C1'-exo",
      "sugar_class": "~C2'-endo",
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      "suiteness": 0.000,
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        "x_axis": [
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        "y_axis": [
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        "z_axis": [
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        ],
        "quaternion": [
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      }
    }
  ],
  "num_hbonds": 35,
  "hbonds": [
    {
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      "donAcc_type": "questionable",
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    {
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    },
    {
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      "atom1_id": "///A/1/N3",
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      "residue_pair": "nt:nt"
    },
    {
      "index": 4,
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      "atom1_id": "///A/1/N4",
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      "residue_pair": "nt:nt"
    },
    {
      "index": 5,
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      "distance": 2.856,
      "atom1_id": "///A/2/O2",
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      "residue_pair": "nt:nt"
    },
    {
      "index": 6,
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      "donAcc_type": "standard",
      "distance": 2.937,
      "atom1_id": "///A/2/N3",
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      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
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      "residue_pair": "nt:nt"
    },
    {
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      "residue_pair": "nt:nt"
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    {
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      "atom1_id": "///A/3/N1",
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      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
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      "atom1_id": "///A/4/N6",
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      "residue_pair": "nt:nt"
    },
    {
      "index": 11,
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      "distance": 2.944,
      "atom1_id": "///A/4/N1",
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      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 12,
      "atom1_serNum": 139,
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      "donAcc_type": "standard",
      "distance": 2.756,
      "atom1_id": "///A/5/N6",
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      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 13,
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      "distance": 2.985,
      "atom1_id": "///A/5/N1",
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      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 14,
      "atom1_serNum": 171,
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      "donAcc_type": "standard",
      "distance": 2.982,
      "atom1_id": "///A/6/O6",
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      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 15,
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      "donAcc_type": "standard",
      "distance": 2.892,
      "atom1_id": "///A/6/N1",
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      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 16,
      "atom1_serNum": 174,
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      "donAcc_type": "standard",
      "distance": 2.886,
      "atom1_id": "///A/6/N2",
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      "residue_pair": "nt:nt"
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    {
      "index": 17,
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      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 18,
      "atom1_serNum": 225,
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      "donAcc_type": "standard",
      "distance": 2.870,
      "atom1_id": "///A/8/N1",
      "atom2_id": "///B/19/N3",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
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    {
      "index": 19,
      "atom1_serNum": 253,
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      "donAcc_type": "standard",
      "distance": 2.924,
      "atom1_id": "///A/9/O2",
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      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 20,
      "atom1_serNum": 254,
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      "donAcc_type": "standard",
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      "atom1_id": "///A/9/N3",
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      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 21,
      "atom1_serNum": 256,
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      "donAcc_type": "standard",
      "distance": 2.820,
      "atom1_id": "///A/9/N4",
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      "residue_pair": "nt:nt"
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    {
      "index": 22,
      "atom1_serNum": 283,
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      "donAcc_type": "standard",
      "distance": 2.989,
      "atom1_id": "///A/10/O2",
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      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 23,
      "atom1_serNum": 284,
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      "donAcc_type": "standard",
      "distance": 2.939,
      "atom1_id": "///A/10/N3",
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      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 24,
      "atom1_serNum": 286,
      "atom2_serNum": 505,
      "donAcc_type": "standard",
      "distance": 2.864,
      "atom1_id": "///A/10/N4",
      "atom2_id": "///B/17/O6",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 25,
      "atom1_serNum": 316,
      "atom2_serNum": 475,
      "donAcc_type": "standard",
      "distance": 2.879,
      "atom1_id": "///A/11/O6",
      "atom2_id": "///B/16/N4",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
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    {
      "index": 26,
      "atom1_serNum": 317,
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      "donAcc_type": "standard",
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      "atom1_id": "///A/11/N1",
      "atom2_id": "///B/16/N3",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 27,
      "atom1_serNum": 319,
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      "donAcc_type": "standard",
      "distance": 2.776,
      "atom1_id": "///A/11/N2",
      "atom2_id": "///B/16/O2",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
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    {
      "index": 28,
      "atom1_serNum": 349,
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      "donAcc_type": "standard",
      "distance": 2.921,
      "atom1_id": "///A/12/O6",
      "atom2_id": "///B/15/N4",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 29,
      "atom1_serNum": 350,
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      "donAcc_type": "standard",
      "distance": 2.821,
      "atom1_id": "///A/12/N1",
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      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 30,
      "atom1_serNum": 352,
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      "donAcc_type": "standard",
      "distance": 2.714,
      "atom1_id": "///A/12/N2",
      "atom2_id": "///B/15/O2",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 31,
      "atom1_serNum": 382,
      "atom2_serNum": 414,
      "donAcc_type": "standard",
      "distance": 2.900,
      "atom1_id": "///A/13/O6",
      "atom2_id": "///B/14/N4",
      "atom_pair": "O:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 32,
      "atom1_serNum": 383,
      "atom2_serNum": 412,
      "donAcc_type": "standard",
      "distance": 2.911,
      "atom1_id": "///A/13/N1",
      "atom2_id": "///B/14/N3",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 33,
      "atom1_serNum": 385,
      "atom2_serNum": 411,
      "donAcc_type": "standard",
      "distance": 2.898,
      "atom1_id": "///A/13/N2",
      "atom2_id": "///B/14/O2",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 34,
      "atom1_serNum": 508,
      "atom2_serNum": 528,
      "donAcc_type": "standard",
      "distance": 3.172,
      "atom1_id": "///B/17/N2",
      "atom2_id": "///B/18/O4'",
      "atom_pair": "N:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 35,
      "atom1_serNum": 541,
      "atom2_serNum": 561,
      "donAcc_type": "standard",
      "distance": 3.014,
      "atom1_id": "///B/18/N2",
      "atom2_id": "///B/19/O4'",
      "atom_pair": "N:O",
      "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": "2o7x",
    "num_naChains": 2,
    "naChains": "A=13,B=13",
    "num_atoms": 811,
    "num_waters": 0,
    "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": 13,
    "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-stacks.pdb",
        "desc": "an ensemble of base stacks"
      },
      {
        "index": 10,
        "name": "dssr-rotmat.txt",
        "desc": "position vector and rotation matrix"
      },
      {
        "index": 11,
        "name": "dssr-viewV.pdb",
        "desc": "vertical view of the principal moment of inertia"
      },
      {
        "index": 12,
        "name": "dssr-viewH.pdb",
        "desc": "horizontal view of the principal moment of inertia"
      },
      {
        "index": 13,
        "name": "dssr-viewT.pdb",
        "desc": "top view of the principal moment of inertia"
      }
    ],
    "time_used": "999"
  }
}
