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      "atom2_id": "///B/95/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 360,
      "atom1_serNum": 2871,
      "atom2_serNum": 2905,
      "donAcc_type": "standard",
      "distance": 2.786,
      "atom1_id": "///B/92/O",
      "atom2_id": "///B/96/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 361,
      "atom1_serNum": 2885,
      "atom2_serNum": 2937,
      "donAcc_type": "standard",
      "distance": 2.880,
      "atom1_id": "///B/93/NH1",
      "atom2_id": "///B/99/O",
      "atom_pair": "N:O",
      "residue_pair": "aa:aa"
    },
    {
      "index": 362,
      "atom1_serNum": 2885,
      "atom2_serNum": 2970,
      "donAcc_type": "standard",
      "distance": 2.935,
      "atom1_id": "///B/93/NH1",
      "atom2_id": "///B/103/O",
      "atom_pair": "N:O",
      "residue_pair": "aa:aa"
    },
    {
      "index": 363,
      "atom1_serNum": 2908,
      "atom2_serNum": 2934,
      "donAcc_type": "standard",
      "distance": 3.267,
      "atom1_id": "///B/96/O",
      "atom2_id": "///B/99/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 364,
      "atom1_serNum": 2919,
      "atom2_serNum": 2942,
      "donAcc_type": "standard",
      "distance": 2.747,
      "atom1_id": "///B/97/O",
      "atom2_id": "///B/100/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 365,
      "atom1_serNum": 2919,
      "atom2_serNum": 2951,
      "donAcc_type": "standard",
      "distance": 2.795,
      "atom1_id": "///B/97/O",
      "atom2_id": "///B/101/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 366,
      "atom1_serNum": 2987,
      "atom2_serNum": 3000,
      "donAcc_type": "acceptable",
      "distance": 2.846,
      "atom1_id": "///B/105/OG1",
      "atom2_id": "///B/107/O",
      "atom_pair": "O:O",
      "residue_pair": "aa:aa"
    },
    {
      "index": 367,
      "atom1_serNum": 3016,
      "atom2_serNum": 3026,
      "donAcc_type": "acceptable",
      "distance": 3.260,
      "atom1_id": "///B/108/OG1",
      "atom2_id": "///B/110/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 368,
      "atom1_serNum": 3060,
      "atom2_serNum": 3062,
      "donAcc_type": "acceptable",
      "distance": 2.807,
      "atom1_id": "///B/114/O",
      "atom2_id": "///B/114/OG",
      "atom_pair": "O:O",
      "residue_pair": "aa:aa"
    },
    {
      "index": 369,
      "atom1_serNum": 3093,
      "atom2_serNum": 3105,
      "donAcc_type": "standard",
      "distance": 2.693,
      "atom1_id": "///B/120/O",
      "atom2_id": "///B/122/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 370,
      "atom1_serNum": 3093,
      "atom2_serNum": 3113,
      "donAcc_type": "standard",
      "distance": 2.775,
      "atom1_id": "///B/120/O",
      "atom2_id": "///B/123/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 371,
      "atom1_serNum": 3100,
      "atom2_serNum": 3127,
      "donAcc_type": "standard",
      "distance": 3.296,
      "atom1_id": "///B/121/O",
      "atom2_id": "///B/125/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 372,
      "atom1_serNum": 3108,
      "atom2_serNum": 3136,
      "donAcc_type": "standard",
      "distance": 3.059,
      "atom1_id": "///B/122/O",
      "atom2_id": "///B/126/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 373,
      "atom1_serNum": 3116,
      "atom2_serNum": 3145,
      "donAcc_type": "standard",
      "distance": 3.076,
      "atom1_id": "///B/123/O",
      "atom2_id": "///B/127/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 374,
      "atom1_serNum": 3123,
      "atom2_serNum": 3157,
      "donAcc_type": "standard",
      "distance": 3.034,
      "atom1_id": "///B/124/O",
      "atom2_id": "///B/128/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 375,
      "atom1_serNum": 3130,
      "atom2_serNum": 3165,
      "donAcc_type": "standard",
      "distance": 2.966,
      "atom1_id": "///B/125/O",
      "atom2_id": "///B/129/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 376,
      "atom1_serNum": 3139,
      "atom2_serNum": 3174,
      "donAcc_type": "standard",
      "distance": 3.200,
      "atom1_id": "///B/126/O",
      "atom2_id": "///B/130/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 377,
      "atom1_serNum": 3139,
      "atom2_serNum": 3181,
      "donAcc_type": "standard",
      "distance": 2.799,
      "atom1_id": "///B/126/O",
      "atom2_id": "///B/130/ND2",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 378,
      "atom1_serNum": 3148,
      "atom2_serNum": 3190,
      "donAcc_type": "standard",
      "distance": 3.195,
      "atom1_id": "///B/127/O",
      "atom2_id": "///B/131/NE2",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 379,
      "atom1_serNum": 3160,
      "atom2_serNum": 3182,
      "donAcc_type": "standard",
      "distance": 2.980,
      "atom1_id": "///B/128/O",
      "atom2_id": "///B/131/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 380,
      "atom1_serNum": 3168,
      "atom2_serNum": 3284,
      "donAcc_type": "standard",
      "distance": 2.701,
      "atom1_id": "///B/129/O",
      "atom2_id": "///B/142/NZ",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 381,
      "atom1_serNum": 3185,
      "atom2_serNum": 3257,
      "donAcc_type": "standard",
      "distance": 3.790,
      "atom1_id": "///B/131/O",
      "atom2_id": "///B/139/NE2",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 382,
      "atom1_serNum": 3199,
      "atom2_serNum": 3211,
      "donAcc_type": "standard",
      "distance": 3.187,
      "atom1_id": "///B/132/NE2",
      "atom2_id": "///B/134/O",
      "atom_pair": "N:O",
      "residue_pair": "aa:aa"
    },
    {
      "index": 383,
      "atom1_serNum": 3207,
      "atom2_serNum": 3213,
      "donAcc_type": "acceptable",
      "distance": 3.095,
      "atom1_id": "///B/133/ND2",
      "atom2_id": "///B/134/OG",
      "atom_pair": "N:O",
      "residue_pair": "aa:aa"
    },
    {
      "index": 384,
      "atom1_serNum": 3213,
      "atom2_serNum": 3222,
      "donAcc_type": "acceptable",
      "distance": 3.467,
      "atom1_id": "///B/134/OG",
      "atom2_id": "///B/136/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 385,
      "atom1_serNum": 3225,
      "atom2_serNum": 3249,
      "donAcc_type": "standard",
      "distance": 2.992,
      "atom1_id": "///B/136/O",
      "atom2_id": "///B/139/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 386,
      "atom1_serNum": 3225,
      "atom2_serNum": 3258,
      "donAcc_type": "standard",
      "distance": 3.220,
      "atom1_id": "///B/136/O",
      "atom2_id": "///B/140/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 387,
      "atom1_serNum": 3236,
      "atom2_serNum": 3267,
      "donAcc_type": "standard",
      "distance": 2.942,
      "atom1_id": "///B/137/O",
      "atom2_id": "///B/141/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 388,
      "atom1_serNum": 3243,
      "atom2_serNum": 3276,
      "donAcc_type": "standard",
      "distance": 2.977,
      "atom1_id": "///B/138/O",
      "atom2_id": "///B/142/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 389,
      "atom1_serNum": 3252,
      "atom2_serNum": 3285,
      "donAcc_type": "standard",
      "distance": 2.988,
      "atom1_id": "///B/139/O",
      "atom2_id": "///B/143/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 390,
      "atom1_serNum": 3257,
      "atom2_serNum": 3284,
      "donAcc_type": "questionable",
      "distance": 3.380,
      "atom1_id": "///B/139/NE2",
      "atom2_id": "///B/142/NZ",
      "atom_pair": "N:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 391,
      "atom1_serNum": 3261,
      "atom2_serNum": 3299,
      "donAcc_type": "standard",
      "distance": 2.996,
      "atom1_id": "///B/140/O",
      "atom2_id": "///B/144/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 392,
      "atom1_serNum": 3270,
      "atom2_serNum": 3308,
      "donAcc_type": "standard",
      "distance": 2.764,
      "atom1_id": "///B/141/O",
      "atom2_id": "///B/145/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 393,
      "atom1_serNum": 3279,
      "atom2_serNum": 3314,
      "donAcc_type": "standard",
      "distance": 3.106,
      "atom1_id": "///B/142/O",
      "atom2_id": "///B/146/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 394,
      "atom1_serNum": 3288,
      "atom2_serNum": 3326,
      "donAcc_type": "standard",
      "distance": 3.008,
      "atom1_id": "///B/143/O",
      "atom2_id": "///B/147/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 395,
      "atom1_serNum": 3302,
      "atom2_serNum": 3333,
      "donAcc_type": "standard",
      "distance": 2.892,
      "atom1_id": "///B/144/O",
      "atom2_id": "///B/148/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 396,
      "atom1_serNum": 3311,
      "atom2_serNum": 3341,
      "donAcc_type": "standard",
      "distance": 3.203,
      "atom1_id": "///B/145/O",
      "atom2_id": "///B/149/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 397,
      "atom1_serNum": 3317,
      "atom2_serNum": 3341,
      "donAcc_type": "standard",
      "distance": 3.111,
      "atom1_id": "///B/146/O",
      "atom2_id": "///B/149/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 398,
      "atom1_serNum": 3344,
      "atom2_serNum": 3348,
      "donAcc_type": "standard",
      "distance": 2.620,
      "atom1_id": "///B/149/O",
      "atom2_id": "///B/149/ND2",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    }
  ],
  "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": "2a6o",
    "num_aaChains": 2,
    "aaChains": "A=152,B=152",
    "num_naChains": 2,
    "naChains": "C=22,D=22",
    "num_atoms": 3515,
    "num_waters": 123,
    "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": 16,
    "auxfiles": [
      {
        "index": 1,
        "name": "dssr-pairs.pdb",
        "desc": "an ensemble of base pairs"
      },
      {
        "index": 2,
        "name": "dssr-multiplets.pdb",
        "desc": "an ensemble of multiplets"
      },
      {
        "index": 3,
        "name": "dssr-stems.pdb",
        "desc": "an ensemble of stems"
      },
      {
        "index": 4,
        "name": "dssr-helices.pdb",
        "desc": "an ensemble of helices (coaxial stacking)"
      },
      {
        "index": 5,
        "name": "dssr-hairpins.pdb",
        "desc": "an ensemble of hairpin loops"
      },
      {
        "index": 6,
        "name": "dssr-bulges.pdb",
        "desc": "an ensemble of bulges"
      },
      {
        "index": 7,
        "name": "dssr-2ndstrs.bpseq",
        "desc": "secondary structure in bpseq format"
      },
      {
        "index": 8,
        "name": "dssr-2ndstrs.ct",
        "desc": "secondary structure in connectivity table format"
      },
      {
        "index": 9,
        "name": "dssr-2ndstrs.dbn",
        "desc": "secondary structure in dot-bracket notation"
      },
      {
        "index": 10,
        "name": "dssr-torsions.txt",
        "desc": "backbone torsion angles and suite names"
      },
      {
        "index": 11,
        "name": "dssr-splays.pdb",
        "desc": "an ensemble of splayed-apart units"
      },
      {
        "index": 12,
        "name": "dssr-stacks.pdb",
        "desc": "an ensemble of base stacks"
      },
      {
        "index": 13,
        "name": "dssr-rotmat.txt",
        "desc": "position vector and rotation matrix"
      },
      {
        "index": 14,
        "name": "dssr-viewV.pdb",
        "desc": "vertical view of the principal moment of inertia"
      },
      {
        "index": 15,
        "name": "dssr-viewH.pdb",
        "desc": "horizontal view of the principal moment of inertia"
      },
      {
        "index": 16,
        "name": "dssr-viewT.pdb",
        "desc": "top view of the principal moment of inertia"
      }
    ],
    "time_used": "999"
  }
}
