Contacts of the helix formed by residues 105 - 132 (chain C) in PDB entry 2R6C


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 TYR 105 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16C  ALA*     4.4     5.4    -      -       -      +
     19C  ALA*     3.7    22.4    -      -       +      -
     20C  VAL*     3.9    15.0    -      -       +      -
     23C  ALA*     6.1     1.1    -      -       +      -
     96C  VAL*     6.0     1.6    -      -       +      -
     98C  THR      5.4     2.2    -      -       -      -
    101C  ASN*     3.1    41.3    -      -       +      -
    102C  VAL*     3.1    18.8    -      -       -      +
    104C  TYR*     1.3    78.2    +      +       -      -
    106C  ALA*     1.3    71.2    +      -       -      +
    108C  ILE*     2.9    17.2    +      -       +      +
    109C  VAL*     2.9    24.0    +      -       -      +
     66D  ASP*     2.4    30.3    +      -       -      -
     68D  VAL*     2.9    46.8    +      -       +      +
     69D  THR*     3.6     9.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 106 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20C  VAL*     3.7     2.6    -      -       +      +
     34C  ALA*     4.6     9.4    -      -       -      -
     37C  ILE*     3.8    25.1    -      -       +      -
     38C  LEU*     3.4    27.1    -      -       +      +
    102C  VAL      2.5    23.6    +      -       -      +
    103C  GLU*     3.6     8.1    -      -       -      -
    104C  TYR*     3.1     5.9    -      -       -      +
    105C  TYR*     1.3    75.1    -      -       -      +
    107C  ARG*     1.3    57.9    +      -       -      +
    109C  VAL      3.0     0.7    +      -       -      -
    110C  GLU*     2.8    24.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 107 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37C  ILE*     3.9    14.5    -      -       +      +
    103C  GLU*     3.1    41.8    +      -       -      +
    104C  TYR*     2.9    22.7    -      -       -      +
    106C  ALA*     1.3    76.2    -      -       -      +
    108C  ILE*     1.3    57.6    +      -       +      +
    110C  GLU*     3.7    19.2    -      -       -      +
    111C  GLU*     2.9    39.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 108 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16C  ALA*     3.5    19.7    -      -       +      -
    104C  TYR*     3.5    14.3    +      -       +      +
    105C  TYR*     2.9    37.9    +      -       +      +
    107C  ARG*     1.3    73.1    -      -       -      +
    109C  VAL*     1.3    66.5    +      -       -      +
    111C  GLU*     3.1    13.3    +      -       -      +
    112C  LYS*     3.0    42.6    +      -       +      +
     63D  GLU*     4.9     6.3    -      -       -      +
     69D  THR*     4.7     5.8    -      -       -      +
     72D  ALA*     3.8    29.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 109 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16C  ALA*     4.0     8.1    -      -       +      +
     17C  GLU*     3.8    50.3    -      -       +      +
     20C  VAL*     4.4     6.3    -      -       +      -
     38C  LEU*     3.8    12.3    -      -       +      -
     42C  ASP      3.4    25.1    -      -       -      +
     43C  PHE*     4.2     7.4    -      -       +      -
    105C  TYR      2.9    14.3    +      -       -      +
    106C  ALA      3.5     4.9    -      -       -      +
    108C  ILE*     1.3    75.6    -      -       -      +
    110C  GLU*     1.3    56.9    +      -       -      +
    112C  LYS*     3.4     6.1    +      -       -      +
    113C  SER*     2.8    27.9    +      -       -      -
    116C  ARG*     5.1     0.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 110 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37C  ILE*     3.5    34.8    -      -       +      +
     38C  LEU*     3.6    11.8    -      -       +      +
     42C  ASP*     4.7     7.0    -      -       -      +
    106C  ALA      2.8    19.5    +      -       -      +
    107C  ARG*     3.7    14.4    -      -       -      +
    109C  VAL*     1.3    72.0    -      -       -      +
    111C  GLU*     1.3    60.8    +      -       -      +
    113C  SER*     3.2     9.0    -      -       -      -
    114C  VAL*     3.0    48.1    +      -       +      +
    117C  ARG*     6.1     1.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 111 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107C  ARG*     2.9    26.1    +      -       +      +
    108C  ILE*     3.1    11.2    +      -       -      +
    110C  GLU*     1.3    76.2    -      -       +      +
    112C  LYS*     1.3    66.8    +      -       +      +
    113C  SER      3.0     1.1    -      -       -      -
    114C  VAL*     2.8    26.3    +      -       -      +
    115C  LEU*     2.9    13.9    +      -       -      +
    133F  GLU      4.3     5.9    -      -       -      +
    134F  ASP      5.4     0.7    +      -       -      -
    136F  ILE*     3.5    42.1    -      -       +      +
    137F  ASP*     5.1     4.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 112 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108C  ILE*     3.0    33.4    +      -       +      +
    109C  VAL*     4.1     5.4    -      -       -      +
    111C  GLU*     1.3    80.0    -      -       -      +
    113C  SER*     1.3    59.7    +      -       -      +
    115C  LEU*     3.9    10.8    -      -       +      +
    116C  ARG*     3.1    39.1    +      -       -      +
     72D  ALA*     4.5     6.5    +      -       -      -
     75D  ALA*     5.5     2.8    -      -       -      +
     76D  ALA*     4.1    17.0    -      -       -      +
    133F  GLU*     2.7    56.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 113 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41C  GLU      4.5     1.6    +      -       -      -
     42C  ASP*     2.8    43.8    +      -       -      -
    109C  VAL      2.8    14.5    +      -       -      -
    110C  GLU      3.2    10.5    -      -       -      -
    112C  LYS*     1.3    74.9    -      -       -      +
    114C  VAL*     1.3    65.2    -      -       -      +
    116C  ARG*     3.4    19.2    +      -       -      +
    117C  ARG*     3.2    32.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 114 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110C  GLU*     3.0    32.6    +      -       +      +
    111C  GLU*     2.8    12.4    +      -       -      +
    113C  SER*     1.3    69.3    -      -       -      +
    115C  LEU*     1.3    67.9    +      -       +      +
    117C  ARG*     3.1    36.1    +      -       +      +
    118C  LEU*     2.9    21.2    +      -       +      +
    136F  ILE*     4.0    13.0    -      -       +      -
    140F  LEU*     3.6    36.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 115 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111C  GLU      2.9     9.1    +      -       -      +
    112C  LYS*     3.9    13.5    -      -       +      +
    114C  VAL*     1.3    78.4    -      -       +      +
    116C  ARG*     1.3    63.6    +      -       -      +
    118C  LEU*     3.1    14.4    +      -       +      +
    119C  ILE*     2.9    29.9    +      -       +      +
    129F  GLY*     3.7    16.6    -      -       -      +
    133F  GLU*     3.5    36.3    -      -       +      -
    136F  ILE*     3.7    43.7    -      -       +      +
    139F  LEU*     3.9    22.4    -      -       +      -
    140F  LEU*     6.0     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 116 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17C  GLU*     5.2     0.8    +      -       -      -
     41C  GLU      3.9     5.9    +      -       -      -
     42C  ASP      3.0    31.9    +      -       -      -
     43C  PHE      3.8    10.5    +      -       -      -
     44C  TYR*     3.9    41.7    -      -       -      +
    109C  VAL*     5.1     0.4    +      -       -      +
    112C  LYS*     3.1    35.5    +      -       -      +
    113C  SER*     3.6    15.9    +      -       -      +
    114C  VAL      3.3     0.2    -      -       -      -
    115C  LEU*     1.3    76.2    -      -       -      +
    117C  ARG*     1.3    50.9    +      -       +      +
    119C  ILE*     3.2    11.2    +      -       -      +
    120C  ARG*     2.8    36.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 117 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42C  ASP*     4.9     6.3    +      -       -      -
    110C  GLU*     6.1     1.0    -      -       -      +
    113C  SER*     3.2    21.9    +      -       -      +
    114C  VAL*     3.1    39.3    +      -       +      +
    116C  ARG*     1.3    75.0    -      -       +      +
    118C  LEU*     1.3    66.6    +      -       -      +
    120C  ARG*     3.2     9.2    +      -       -      +
    121C  THR*     2.9    34.3    +      -       +      +
    149C  GLU      4.4    21.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 118 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114C  VAL*     2.9    13.5    +      -       +      +
    115C  LEU*     3.3    18.8    -      -       +      +
    117C  ARG*     1.3    77.9    -      -       -      +
    119C  ILE*     1.3    59.6    +      -       +      +
    121C  THR*     3.1     5.9    +      -       -      +
    122C  ALA*     2.8    31.2    +      -       -      +
    147C  ILE*     4.1    26.9    -      -       +      +
    125F  ILE*     3.7    19.7    -      -       +      +
    129F  GLY*     5.4     3.8    -      -       -      -
    139F  LEU*     3.7    38.6    -      -       +      +
    140F  LEU*     4.1    26.9    -      -       +      +
    143F  ALA*     4.2     8.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 119 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115C  LEU*     2.9    18.4    +      -       +      +
    116C  ARG*     3.5     9.6    -      -       -      +
    118C  LEU*     1.3    77.6    -      -       +      +
    120C  ARG*     1.3    53.8    +      -       -      +
    122C  ALA*     3.7     4.8    -      -       -      +
    123C  THR*     2.7    51.7    +      -       -      +
    125F  ILE      5.1     0.2    -      -       -      +
    126F  ALA*     4.1    22.0    -      -       +      +
    129F  GLY*     3.9    23.8    -      -       -      +
    130F  TYR*     3.4    47.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 120 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116C  ARG      2.8    19.2    +      -       -      +
    117C  ARG*     3.6    10.3    -      -       -      +
    118C  LEU      3.2     0.2    -      -       -      -
    119C  ILE*     1.3    75.5    -      -       -      +
    121C  THR*     1.3    59.8    +      -       +      +
    123C  THR*     3.8     4.5    -      -       -      -
    124C  SER*     2.9    31.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 121 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117C  ARG*     2.9    26.2    +      -       +      +
    118C  LEU*     3.2    13.3    +      -       -      +
    120C  ARG*     1.3    75.6    -      -       +      +
    122C  ALA*     1.3    59.2    +      -       -      +
    124C  SER*     4.0     7.8    -      -       -      -
    125C  ILE*     3.1    30.4    +      -       -      +
    146C  LYS*     4.1    37.1    +      -       +      +
    147C  ILE*     4.4    10.7    -      -       -      +
    149C  GLU      6.3     2.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 122 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118C  LEU      2.8    17.3    +      -       -      +
    119C  ILE*     3.7     5.2    -      -       -      +
    121C  THR*     1.3    76.7    +      -       -      +
    123C  THR*     1.3    64.5    +      -       -      +
    125C  ILE*     3.0    21.2    +      -       -      +
    126C  ALA*     3.2    10.4    +      -       -      +
    147C  ILE*     5.1     7.2    -      -       +      -
    122F  ALA*     4.1    27.1    -      -       -      +
    125F  ILE*     4.2    20.0    -      -       +      -
    126F  ALA*     4.6     5.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 123 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119C  ILE*     2.7    40.6    +      -       -      +
    120C  ARG*     3.8     4.9    -      -       -      -
    122C  ALA*     1.3    72.5    -      -       -      +
    124C  SER*     1.3    57.2    +      -       -      +
    126C  ALA*     3.1     9.0    +      -       +      +
    127C  GLN*     2.8    33.4    +      -       +      +
    126F  ALA*     4.3    11.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 124 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120C  ARG*     2.9    20.1    +      -       -      -
    121C  THR*     4.1     8.3    -      -       -      -
    122C  ALA      3.3     0.2    -      -       -      -
    123C  THR*     1.3    74.9    -      -       -      +
    125C  ILE*     1.3    57.2    +      -       -      +
    127C  GLN*     4.2     8.5    -      -       -      +
    128C  ASP*     2.8    45.7    +      -       -      +
    146C  LYS*     4.6    16.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 125 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121C  THR      3.1    18.4    +      -       -      +
    122C  ALA*     3.0    11.9    +      -       -      +
    124C  SER*     1.3    76.9    -      -       -      +
    126C  ALA*     1.3    61.6    +      -       -      +
    128C  ASP*     3.2     7.3    +      -       -      +
    129C  GLY*     2.8    25.6    +      -       -      -
    139C  LEU*     4.5     4.8    -      -       +      +
    143C  ALA*     3.8    38.8    -      -       +      +
    146C  LYS*     4.9    13.7    -      -       +      +
    147C  ILE*     4.0    16.4    -      -       +      -
    118F  LEU*     4.1    27.5    -      -       +      +
    122F  ALA*     4.0    16.8    -      -       +      -
    147F  ILE*     4.6     6.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 126 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122C  ALA      3.2     7.3    +      -       -      +
    123C  THR*     3.1    10.8    +      -       +      +
    125C  ILE*     1.3    76.8    -      -       -      +
    127C  GLN*     1.3    59.4    +      -       -      +
    129C  GLY*     2.6    25.7    +      -       -      +
    130C  TYR*     3.3    18.3    -      -       +      -
    119F  ILE*     4.6    17.2    -      -       +      +
    122F  ALA*     4.5     8.3    -      -       +      +
    123F  THR*     4.4    17.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 127 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123C  THR*     2.8    25.4    +      -       +      +
    124C  SER*     4.1     8.3    -      -       -      +
    126C  ALA*     1.3    72.5    -      -       -      +
    128C  ASP*     1.3    67.6    +      -       -      +
    129C  GLY      3.4     0.3    +      -       -      -
    130C  TYR*     3.7    15.9    +      -       -      +
    131C  THR*     3.9    25.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 128 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124C  SER*     2.8    37.7    +      -       -      +
    125C  ILE*     3.4     9.0    -      -       -      +
    126C  ALA      3.1     0.2    -      -       -      -
    127C  GLN*     1.3    78.9    -      -       -      +
    129C  GLY*     1.3    62.4    +      -       -      +
    130C  TYR      3.2     2.3    +      -       -      -
    131C  THR*     3.9    11.3    +      -       -      -
    132C  ARG*     3.1    51.8    +      -       -      +
    139C  LEU*     3.6    21.2    -      -       +      +
    142C  GLU*     4.8     0.5    -      -       -      -
    146C  LYS*     4.3    12.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 129 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125C  ILE      2.8     8.9    +      -       -      -
    126C  ALA      2.6    21.2    +      -       -      -
    128C  ASP*     1.3    71.9    -      -       -      +
    130C  TYR*     1.3    61.9    +      -       -      +
    133C  GLU*     4.2    11.3    -      -       -      +
    139C  LEU*     4.4    11.9    -      -       -      +
    115F  LEU*     4.1    21.2    -      -       -      +
    118F  LEU*     5.3     2.5    -      -       -      -
    119F  ILE*     4.5    16.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 130 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126C  ALA*     3.3    26.2    -      -       +      -
    127C  GLN*     3.7     9.4    +      -       -      +
    128C  ASP      3.2     0.2    -      -       -      -
    129C  GLY*     1.3    80.2    -      -       -      +
    131C  THR*     1.3    67.4    +      -       +      +
    132C  ARG      3.3     9.2    -      -       -      +
    133C  GLU*     4.2    13.9    -      -       -      +
    119F  ILE*     3.5    35.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 131 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127C  GLN*     3.9    28.2    -      -       -      +
    128C  ASP*     3.8    18.7    +      -       -      -
    130C  TYR*     1.3    75.3    -      -       +      +
    132C  ARG*     1.3    72.1    +      -       -      +
    134C  ASP*     4.1     6.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 132 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128C  ASP*     3.1    33.9    +      -       -      +
    130C  TYR      3.3     4.0    -      -       -      +
    131C  THR*     1.3    88.5    +      -       -      +
    133C  GLU*     1.3    77.3    +      -       -      +
    134C  ASP*     3.2    14.1    -      -       -      +
    135C  GLU*     2.6    49.6    +      -       -      +
    138C  VAL*     5.2     0.6    -      -       -      +
    139C  LEU*     3.4    34.7    -      -       +      +
    142C  GLU*     3.2    31.3    +      -       -      -
    146C  LYS*     5.0     0.2    -      -       -      +
----------------------------------------------------------
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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