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      "atom1_id": "///A/260/O",
      "atom2_id": "///A/264/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 301,
      "atom1_serNum": 2119,
      "atom2_serNum": 2152,
      "donAcc_type": "standard",
      "distance": 3.070,
      "atom1_id": "///A/261/O",
      "atom2_id": "///A/265/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 302,
      "atom1_serNum": 2128,
      "atom2_serNum": 2161,
      "donAcc_type": "standard",
      "distance": 3.185,
      "atom1_id": "///A/262/O",
      "atom2_id": "///A/266/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 303,
      "atom1_serNum": 2139,
      "atom2_serNum": 2170,
      "donAcc_type": "standard",
      "distance": 2.785,
      "atom1_id": "///A/263/O",
      "atom2_id": "///A/267/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 304,
      "atom1_serNum": 2144,
      "atom2_serNum": 2178,
      "donAcc_type": "standard",
      "distance": 2.782,
      "atom1_id": "///A/264/O",
      "atom2_id": "///A/268/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 305,
      "atom1_serNum": 2148,
      "atom2_serNum": 2637,
      "donAcc_type": "standard",
      "distance": 2.961,
      "atom1_id": "///A/264/NE",
      "atom2_id": "///D/1536/N3",
      "atom_pair": "N:N",
      "residue_pair": "aa:nt"
    },
    {
      "index": 306,
      "atom1_serNum": 2150,
      "atom2_serNum": 2186,
      "donAcc_type": "standard",
      "distance": 2.828,
      "atom1_id": "///A/264/NH1",
      "atom2_id": "///A/268/OE2",
      "atom_pair": "N:O",
      "residue_pair": "aa:aa"
    },
    {
      "index": 307,
      "atom1_serNum": 2151,
      "atom2_serNum": 2636,
      "donAcc_type": "standard",
      "distance": 2.653,
      "atom1_id": "///A/264/NH2",
      "atom2_id": "///D/1536/O2",
      "atom_pair": "N:O",
      "residue_pair": "aa:nt"
    },
    {
      "index": 308,
      "atom1_serNum": 2155,
      "atom2_serNum": 2187,
      "donAcc_type": "standard",
      "distance": 3.164,
      "atom1_id": "///A/265/O",
      "atom2_id": "///A/269/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 309,
      "atom1_serNum": 2164,
      "atom2_serNum": 2195,
      "donAcc_type": "standard",
      "distance": 2.947,
      "atom1_id": "///A/266/O",
      "atom2_id": "///A/270/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 310,
      "atom1_serNum": 2173,
      "atom2_serNum": 2203,
      "donAcc_type": "standard",
      "distance": 2.740,
      "atom1_id": "///A/267/O",
      "atom2_id": "///A/271/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 311,
      "atom1_serNum": 2181,
      "atom2_serNum": 2211,
      "donAcc_type": "standard",
      "distance": 2.827,
      "atom1_id": "///A/268/O",
      "atom2_id": "///A/272/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 312,
      "atom1_serNum": 2181,
      "atom2_serNum": 2215,
      "donAcc_type": "standard",
      "distance": 3.503,
      "atom1_id": "///A/268/O",
      "atom2_id": "///A/273/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 313,
      "atom1_serNum": 2186,
      "atom2_serNum": 2233,
      "donAcc_type": "standard",
      "distance": 3.231,
      "atom1_id": "///A/268/OE2",
      "atom2_id": "///A/275/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 314,
      "atom1_serNum": 2206,
      "atom2_serNum": 2222,
      "donAcc_type": "standard",
      "distance": 2.898,
      "atom1_id": "///A/271/O",
      "atom2_id": "///A/273/NE",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 315,
      "atom1_serNum": 2236,
      "atom2_serNum": 2652,
      "donAcc_type": "acceptable",
      "distance": 2.781,
      "atom1_id": "///A/275/O",
      "atom2_id": "///D/1537/O2'",
      "atom_pair": "O:O",
      "residue_pair": "aa:nt"
    },
    {
      "index": 316,
      "atom1_serNum": 2252,
      "atom2_serNum": 2656,
      "donAcc_type": "standard",
      "distance": 2.782,
      "atom1_id": "///A/277/N",
      "atom2_id": "///D/1537/O2",
      "atom_pair": "N:O",
      "residue_pair": "aa:nt"
    },
    {
      "index": 317,
      "atom1_serNum": 2255,
      "atom2_serNum": 2657,
      "donAcc_type": "standard",
      "distance": 2.772,
      "atom1_id": "///A/277/O",
      "atom2_id": "///D/1537/N3",
      "atom_pair": "O:N",
      "residue_pair": "aa:nt"
    },
    {
      "index": 318,
      "atom1_serNum": 2268,
      "atom2_serNum": 2679,
      "donAcc_type": "standard",
      "distance": 3.409,
      "atom1_id": "///A/278/OE2",
      "atom2_id": "///D/1538/N4",
      "atom_pair": "O:N",
      "residue_pair": "aa:nt"
    },
    {
      "index": 319,
      "atom1_serNum": 2272,
      "atom2_serNum": 2619,
      "donAcc_type": "standard",
      "distance": 2.691,
      "atom1_id": "///A/279/O",
      "atom2_id": "///D/1535/N4",
      "atom_pair": "O:N",
      "residue_pair": "aa:nt"
    },
    {
      "index": 320,
      "atom1_serNum": 2302,
      "atom2_serNum": 2598,
      "donAcc_type": "standard",
      "distance": 2.876,
      "atom1_id": "///A/281/N",
      "atom2_id": "///D/1534/N1",
      "atom_pair": "N:N",
      "residue_pair": "aa:nt"
    },
    {
      "index": 321,
      "atom1_serNum": 2305,
      "atom2_serNum": 2597,
      "donAcc_type": "standard",
      "distance": 2.882,
      "atom1_id": "///A/281/O",
      "atom2_id": "///D/1534/N6",
      "atom_pair": "O:N",
      "residue_pair": "aa:nt"
    },
    {
      "index": 322,
      "atom1_serNum": 2328,
      "atom2_serNum": 2347,
      "donAcc_type": "standard",
      "distance": 3.260,
      "atom1_id": "///A/284/O",
      "atom2_id": "///A/287/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 323,
      "atom1_serNum": 2335,
      "atom2_serNum": 2392,
      "donAcc_type": "standard",
      "distance": 3.162,
      "atom1_id": "///A/285/O",
      "atom2_id": "///A/290/NH1",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 324,
      "atom1_serNum": 2342,
      "atom2_serNum": 2372,
      "donAcc_type": "standard",
      "distance": 2.905,
      "atom1_id": "///A/286/O",
      "atom2_id": "///A/289/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 325,
      "atom1_serNum": 2350,
      "atom2_serNum": 2383,
      "donAcc_type": "standard",
      "distance": 2.997,
      "atom1_id": "///A/287/O",
      "atom2_id": "///A/290/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 326,
      "atom1_serNum": 2386,
      "atom2_serNum": 2410,
      "donAcc_type": "standard",
      "distance": 3.090,
      "atom1_id": "///A/290/O",
      "atom2_id": "///A/293/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 327,
      "atom1_serNum": 2386,
      "atom2_serNum": 2422,
      "donAcc_type": "standard",
      "distance": 3.050,
      "atom1_id": "///A/290/O",
      "atom2_id": "///A/294/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 328,
      "atom1_serNum": 2397,
      "atom2_serNum": 2429,
      "donAcc_type": "standard",
      "distance": 2.984,
      "atom1_id": "///A/291/O",
      "atom2_id": "///A/295/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 329,
      "atom1_serNum": 2404,
      "atom2_serNum": 2448,
      "donAcc_type": "standard",
      "distance": 2.872,
      "atom1_id": "///A/292/O",
      "atom2_id": "///A/296/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 330,
      "atom1_serNum": 2413,
      "atom2_serNum": 2456,
      "donAcc_type": "standard",
      "distance": 2.961,
      "atom1_id": "///A/293/O",
      "atom2_id": "///A/297/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 331,
      "atom1_serNum": 2425,
      "atom2_serNum": 2471,
      "donAcc_type": "standard",
      "distance": 2.993,
      "atom1_id": "///A/294/O",
      "atom2_id": "///A/299/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 332,
      "atom1_serNum": 2433,
      "atom2_serNum": 2467,
      "donAcc_type": "standard",
      "distance": 2.964,
      "atom1_id": "///A/295/O",
      "atom2_id": "///A/298/N",
      "atom_pair": "O:N",
      "residue_pair": "aa:aa"
    },
    {
      "index": 333,
      "atom1_serNum": 2508,
      "atom2_serNum": 2532,
      "donAcc_type": "acceptable",
      "distance": 3.098,
      "atom1_id": "///D/1531/O2'",
      "atom2_id": "///D/1532/O4'",
      "atom_pair": "O:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 334,
      "atom1_serNum": 2570,
      "atom2_serNum": 2582,
      "donAcc_type": "acceptable",
      "distance": 2.750,
      "atom1_id": "///D/1533/O2'",
      "atom2_id": "///D/1534/OP2",
      "atom_pair": "O:O",
      "residue_pair": "nt:nt"
    },
    {
      "index": 335,
      "atom1_serNum": 2600,
      "atom2_serNum": 2619,
      "donAcc_type": "standard",
      "distance": 3.285,
      "atom1_id": "///D/1534/N3",
      "atom2_id": "///D/1535/N4",
      "atom_pair": "N:N",
      "residue_pair": "nt:nt"
    },
    {
      "index": 336,
      "atom1_serNum": 2732,
      "atom2_serNum": 2736,
      "donAcc_type": "acceptable",
      "distance": 2.793,
      "atom1_id": "///D/1541/O2'",
      "atom2_id": "///D/1541/O2",
      "atom_pair": "O: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": "3iev",
    "num_aaChains": 1,
    "aaChains": "A=303",
    "num_naChains": 1,
    "naChains": "D=11",
    "num_atoms": 2902,
    "num_waters": 245,
    "num_metals": 1,
    "metals_desc": "Mg=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": 6,
    "auxfiles": [
      {
        "index": 1,
        "name": "dssr-2ndstrs.bpseq",
        "desc": "secondary structure in bpseq format"
      },
      {
        "index": 2,
        "name": "dssr-2ndstrs.ct",
        "desc": "secondary structure in connectivity table format"
      },
      {
        "index": 3,
        "name": "dssr-2ndstrs.dbn",
        "desc": "secondary structure in dot-bracket notation"
      },
      {
        "index": 4,
        "name": "dssr-torsions.txt",
        "desc": "backbone torsion angles and suite names"
      },
      {
        "index": 5,
        "name": "dssr-splays.pdb",
        "desc": "an ensemble of splayed-apart units"
      },
      {
        "index": 6,
        "name": "dssr-stacks.pdb",
        "desc": "an ensemble of base stacks"
      }
    ],
    "time_used": "999"
  }
}
