Contacts of the helix formed by residues 116 - 141 (chain C) in PDB entry 2NP5


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with SER 116 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    601A  NDS      3.8     3.1    -      -       -      -
     54C  ASP*     2.6    29.2    +      -       -      -
    112C  ARG*     3.2    16.1    +      -       -      -
    113C  ALA      3.4     6.9    +      -       -      +
    115C  THR*     1.3    82.4    -      -       -      +
    117C  PRO*     1.3    61.9    -      -       -      +
    118C  SER*     3.2    12.5    +      -       -      -
    119C  LEU*     3.2    20.6    -      -       -      +
    120C  ALA      2.9    23.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with PRO 117 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    601A  NDS      3.8    30.7    -      -       +      -
     54C  ASP*     5.7     1.1    -      -       -      +
    115C  THR      3.8     7.0    -      -       -      +
    116C  SER*     1.3    84.9    -      -       -      +
    118C  SER*     1.3    57.9    +      -       -      +
    120C  ALA*     3.7     2.6    -      -       +      +
    121C  GLU*     2.9    30.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 118 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54C  ASP*     2.6    29.4    +      -       -      -
     58C  ALA*     3.9    19.4    -      -       -      +
    116C  SER*     3.2     3.7    +      -       -      -
    117C  PRO*     1.3    78.2    -      -       -      +
    119C  LEU*     1.3    60.5    +      -       -      +
    121C  GLU*     3.3     5.1    +      -       -      +
    122C  ILE*     3.0    35.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 119 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54C  ASP*     4.6     2.7    -      -       -      +
     57C  PHE*     4.0    12.3    -      -       +      +
     58C  ALA*     3.7    33.9    -      -       -      +
     61C  LEU*     3.8    25.9    -      -       +      +
    109C  PHE*     3.8    22.6    -      -       +      +
    112C  ARG*     3.4    37.7    -      -       +      -
    113C  ALA*     4.0    11.9    -      -       +      +
    116C  SER*     3.2    22.5    +      -       -      +
    118C  SER*     1.3    81.0    +      -       -      +
    120C  ALA*     1.3    64.5    +      -       -      +
    122C  ILE*     3.4     1.8    +      -       -      +
    123C  ARG*     3.0    23.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 120 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166A  GLY*     3.3    28.5    -      -       -      +
    167A  SER*     4.4     4.7    +      -       -      +
    601A  NDS      3.8    11.0    -      -       +      -
    113C  ALA*     3.6    21.4    -      -       +      +
    116C  SER      2.9    16.9    +      -       -      +
    117C  PRO      3.7     4.5    -      -       -      +
    119C  LEU*     1.3    75.2    -      -       -      +
    121C  GLU*     1.3    58.3    +      -       -      +
    123C  ARG*     3.4     4.2    +      -       -      +
    124C  ARG*     2.9    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 121 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117C  PRO      2.9    18.8    +      -       -      +
    118C  SER*     3.7     5.6    -      -       -      +
    120C  ALA*     1.3    74.1    -      -       -      +
    122C  ILE*     1.3    68.1    +      -       +      +
    124C  ARG*     2.7    40.5    +      -       -      -
    125C  LYS*     2.5    57.4    +      -       +      +
     77D  ARG*     3.2    32.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 122 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58C  ALA*     3.4    43.7    -      -       +      +
     61C  LEU*     3.6    31.4    -      -       +      -
     62C  ARG*     3.5    27.4    -      -       +      +
     65C  VAL*     4.4     7.6    -      -       +      -
    118C  SER*     3.0    23.9    +      -       -      +
    121C  GLU*     1.3    78.7    -      -       +      +
    123C  ARG*     1.3    59.8    +      -       -      +
    125C  LYS*     3.3     6.5    +      -       -      +
    126C  THR*     2.9    37.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 123 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162A  LEU*     4.1    12.2    -      -       -      +
    163A  ASP*     2.6    38.6    +      -       -      +
    166A  GLY*     6.2     2.2    -      -       -      -
     61C  LEU*     4.5     6.2    -      -       +      +
     65C  VAL*     6.1     0.9    -      -       -      -
    106C  MSE      4.1    26.5    +      -       -      +
    109C  PHE      5.5     0.4    -      -       -      -
    110C  ALA*     3.5    39.5    -      -       -      +
    113C  ALA*     5.1     4.0    -      -       +      -
    119C  LEU      3.0    16.9    +      -       -      +
    120C  ALA*     3.7     7.0    -      -       -      +
    122C  ILE*     1.3    77.0    -      -       -      +
    124C  ARG*     1.3    57.9    +      -       -      +
    126C  THR*     3.1     7.4    +      -       -      -
    127C  LEU*     2.9    47.6    +      -       +      +
    158C  ASP*     3.0    24.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 124 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167A  SER*     4.2    13.0    -      -       -      +
    170A  LEU*     3.4    28.7    -      -       +      -
    601A  NDS      5.6     1.1    -      -       -      -
    120C  ALA      2.9    18.2    +      -       -      +
    121C  GLU*     2.7    43.3    +      -       -      +
    123C  ARG*     1.3    77.8    -      -       -      +
    125C  LYS*     1.3    66.7    +      -       -      +
    127C  LEU*     3.4     9.5    +      -       -      +
    128C  PHE*     2.9    22.9    +      -       -      +
    131C  ARG*     5.1     0.7    +      -       -      -
     73D  SER*     2.9    51.1    +      -       -      -
     74D  GLU*     3.7    11.5    +      -       -      -
     76D  GLU*     2.9    30.1    +      -       -      +
     77D  ARG*     3.8    13.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 125 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121C  GLU*     2.5    58.0    +      -       +      +
    122C  ILE*     3.8     6.7    -      -       -      +
    124C  ARG*     1.3    83.5    -      -       -      +
    126C  THR*     1.3    57.9    +      -       -      +
    128C  PHE*     3.3     8.2    +      -       -      +
    129C  THR*     2.9    34.5    +      -       -      +
     70D  ALA*     3.7    33.8    -      -       +      -
     73D  SER*     3.7     9.8    -      -       -      +
     74D  GLU*     3.2    25.6    +      -       -      -
     77D  ARG*     3.7     5.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 126 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65C  VAL*     3.1    46.9    -      -       +      +
     68C  LEU*     4.8     5.8    -      -       +      -
     69C  LEU*     4.8     5.4    -      -       +      -
    106C  MSE      6.0     2.2    -      -       -      -
    122C  ILE*     2.9    23.1    +      -       -      +
    123C  ARG*     3.5     9.2    -      -       -      -
    125C  LYS*     1.3    74.6    -      -       -      +
    127C  LEU*     1.3    61.1    +      -       +      +
    129C  THR*     3.3     8.0    +      -       -      -
    130C  ILE*     3.0    47.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 127 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163A  ASP*     3.7    30.3    -      -       +      +
    171A  TYR*     4.1    11.7    -      -       +      +
    123C  ARG*     2.9    44.6    +      -       +      +
    124C  ARG*     3.8     7.9    -      -       -      +
    126C  THR*     1.3    77.4    -      -       +      +
    128C  PHE*     1.3    57.8    +      -       -      +
    130C  ILE*     3.3     4.0    +      -       +      -
    131C  ARG*     2.8    46.3    +      -       -      +
    154C  LEU*     3.8    26.2    -      -       +      +
    158C  ASP*     3.6    23.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 128 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124C  ARG*     2.9    18.9    +      -       -      +
    125C  LYS      3.5     4.5    -      -       -      +
    127C  LEU*     1.3    76.9    -      -       -      +
    129C  THR*     1.3    58.3    +      -       -      +
    131C  ARG*     3.5    18.0    -      -       -      +
    132C  THR*     2.8    55.3    +      -       -      -
     69D  LEU*     3.4    36.8    -      -       +      -
     72D  LEU*     4.2    13.0    -      -       +      -
     73D  SER*     3.4    34.5    -      -       -      -
     76D  GLU*     3.5    36.6    -      -       +      +
    133D  GLY*     5.2    10.1    -      -       -      -
    136D  ALA*     6.1     4.5    -      -       +      -
    137D  VAL*     5.5     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 129 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69C  LEU*     4.3    18.8    -      -       +      +
    125C  LYS      2.9    18.0    +      -       -      -
    126C  THR*     3.5     7.2    -      -       -      -
    127C  LEU      3.3     0.2    -      -       -      -
    128C  PHE*     1.3    76.5    -      -       -      +
    130C  ILE*     1.3    64.7    +      -       -      +
    132C  THR*     3.4     3.3    +      -       -      -
    133C  GLY*     3.1    19.1    +      -       -      -
     62D  ARG*     5.1     3.2    +      -       -      +
     66D  ASP*     3.3    41.1    +      -       +      +
     69D  LEU*     4.1    28.0    -      -       +      +
     70D  ALA*     4.7     4.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 130 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68C  LEU*     4.1    19.5    -      -       +      -
     69C  LEU*     3.9    17.7    -      -       +      -
     72C  LEU*     4.0    14.4    -      -       +      -
     89C  MSE      4.1    13.7    -      -       +      -
     92C  LEU*     5.0     5.2    -      -       +      -
    126C  THR*     3.0    38.4    +      -       +      +
    127C  LEU*     5.0     3.8    -      -       +      -
    129C  THR*     1.3    75.4    -      -       -      +
    131C  ARG*     1.3    59.5    +      -       -      +
    133C  GLY*     3.1     3.8    +      -       -      -
    134C  LEU*     2.9    41.4    +      -       +      +
    154C  LEU*     3.9    32.5    -      -       +      -
     62D  ARG*     5.6     2.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 131 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171A  TYR*     4.8     9.5    +      -       -      -
    175A  TYR*     5.5     1.5    +      -       -      -
    124C  ARG      5.1     0.4    +      -       -      -
    127C  LEU*     2.8    41.4    +      -       -      +
    128C  PHE*     3.5    23.0    +      -       -      +
    130C  ILE*     1.3    78.7    -      -       -      +
    132C  THR*     1.3    57.7    +      -       -      +
    134C  LEU*     3.4     7.3    +      -       -      +
    135C  SER*     2.8    35.6    +      -       -      +
    147C  GLU      5.2     0.6    +      -       -      +
    150C  ALA*     4.0     2.6    -      -       +      +
    151C  ALA*     3.8    41.3    -      -       +      +
    154C  LEU*     4.0    13.9    -      -       +      +
     76D  GLU*     2.5    32.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 132 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128C  PHE*     2.8    44.9    +      -       -      -
    129C  THR      3.8     4.0    -      -       -      -
    130C  ILE      3.3     0.2    -      -       -      -
    131C  ARG*     1.3    75.4    +      -       -      +
    133C  GLY*     1.3    57.6    +      -       -      +
    135C  SER*     3.3     7.4    +      -       -      -
    136C  ALA*     2.9    28.2    +      -       -      +
     69D  LEU*     4.0    18.2    -      -       +      -
    129D  THR*     3.8    13.0    -      -       +      +
    132D  THR*     4.0     6.4    -      -       +      +
    133D  GLY*     3.7    31.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 133 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76C  GLU*     5.2     6.3    -      -       -      -
    129C  THR      3.1    14.1    +      -       -      -
    130C  ILE*     3.1     4.0    +      -       -      -
    132C  THR*     1.3    76.9    -      -       -      +
    134C  LEU*     1.3    60.5    +      -       -      +
    136C  ALA*     3.3     5.0    +      -       -      +
    137C  VAL*     3.2    27.7    +      -       -      +
     62D  ARG*     6.1     3.4    -      -       -      -
    129D  THR*     4.3    16.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 134 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76C  GLU*     4.2    12.9    +      -       -      +
     85C  LEU*     3.6    28.0    -      -       +      +
     88C  ALA*     5.4     0.4    -      -       +      -
     89C  MSE      4.0    25.8    -      -       +      -
    130C  ILE*     2.9    39.4    +      -       +      +
    131C  ARG*     3.7     4.5    -      -       -      +
    133C  GLY*     1.3    71.6    -      -       -      +
    135C  SER*     1.3    64.0    +      -       -      +
    137C  VAL*     3.2     7.6    +      -       -      +
    138C  LEU*     3.0    28.1    +      -       +      +
    150C  ALA*     3.8    30.5    -      -       +      +
    153C  LEU*     4.2    10.8    -      -       +      -
    154C  LEU*     4.1    15.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 135 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131C  ARG*     2.8    28.0    +      -       -      +
    132C  THR*     3.5     7.4    -      -       -      -
    134C  LEU*     1.3    71.7    -      -       -      +
    136C  ALA*     1.3    58.8    +      -       -      +
    138C  LEU*     3.2     4.3    +      -       -      +
    139C  ILE*     2.8    37.4    +      -       -      +
    146C  ALA      4.7     1.8    -      -       -      -
    147C  GLU*     3.5    32.2    +      -       -      +
    150C  ALA*     3.3    18.3    -      -       -      +
    132D  THR*     4.0    10.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 136 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132C  THR      2.9    16.4    +      -       -      +
    133C  GLY      3.6     5.2    -      -       -      +
    134C  LEU      3.2     0.2    -      -       -      -
    135C  SER*     1.3    76.1    -      -       -      +
    137C  VAL*     1.3    64.2    +      -       -      +
    139C  ILE*     4.6     0.2    -      -       -      -
    140C  GLY*     3.0    20.1    +      -       -      -
    125D  LYS*     4.4     6.4    +      -       -      +
    128D  PHE*     3.3    21.8    -      -       +      -
    129D  THR*     3.8    24.5    -      -       -      +
    132D  THR*     3.4    25.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 137 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76C  GLU*     4.1    24.9    -      -       +      +
     81C  PRO*     4.6    16.8    -      -       +      +
     84C  ALA*     6.0     3.8    -      -       +      -
     85C  LEU*     4.1    31.0    -      -       +      -
    133C  GLY      3.2    12.9    +      -       -      +
    134C  LEU*     3.2     8.5    +      -       -      +
    136C  ALA*     1.3    77.9    -      -       +      +
    138C  LEU*     1.3    62.4    +      -       +      +
    140C  GLY*     3.3    10.1    +      -       -      -
    141C  ILE*     3.5    16.4    +      -       +      +
    125D  LYS*     4.0    22.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 138 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85C  LEU*     3.9    18.2    -      -       +      -
    134C  LEU*     3.0    17.6    +      -       +      +
    135C  SER      3.2     1.1    +      -       -      +
    137C  VAL*     1.3    73.3    -      -       +      +
    139C  ILE*     1.3    65.3    +      -       -      +
    141C  ILE*     3.3     8.3    +      -       +      -
    143C  THR*     2.9    48.0    +      -       +      +
    146C  ALA*     3.6    29.2    -      -       +      +
    149C  ARG*     4.3     2.9    -      -       +      -
    150C  ALA*     3.7    24.0    -      -       +      +
    153C  LEU*     5.6     3.8    -      -       +      -
    187C  ILE*     3.8    24.2    -      -       +      -
    188C  LEU*     3.8    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 139 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135C  SER      2.8    25.2    +      -       -      +
    136C  ALA      3.9     2.9    -      -       -      +
    138C  LEU*     1.3    72.1    -      -       -      +
    140C  GLY*     1.3    63.7    +      -       -      +
    142C  GLY*     3.0    16.3    +      -       -      +
    143C  THR      4.8     1.8    -      -       -      +
    146C  ALA*     3.5    18.6    -      -       +      -
    147C  GLU*     4.4    21.5    -      -       +      +
    128D  PHE*     3.9    20.0    -      -       +      -
    132D  THR*     3.7    28.0    -      -       +      +
    135D  SER*     5.9     1.1    -      -       -      +
    147D  GLU*     5.1    12.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 140 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136C  ALA      3.0    17.3    +      -       -      -
    137C  VAL      3.3     2.9    +      -       -      -
    138C  LEU      3.2     0.6    -      -       -      -
    139C  ILE*     1.3    77.2    -      -       -      +
    141C  ILE*     1.3    63.7    +      -       -      +
    142C  GLY      3.5     0.4    +      -       -      -
    124D  ARG*     6.3     1.1    -      -       -      -
    125D  LYS*     6.0     1.8    -      -       -      -
    128D  PHE*     4.2    14.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 141 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81C  PRO*     3.8    35.2    -      -       +      -
    137C  VAL*     3.6    14.4    -      -       +      +
    138C  LEU*     3.4     8.1    -      -       +      +
    140C  GLY*     1.3    82.8    -      -       -      +
    142C  GLY*     1.3    54.3    +      -       -      +
    143C  THR*     3.4    16.3    +      -       -      +
    188C  LEU*     3.6    31.6    -      -       +      -
    191C  ALA*     4.1     6.3    -      -       +      -
    192C  ASP*     2.7    55.6    +      -       -      +
    193C  VAL      4.7     3.8    -      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il