Contacts of the helix formed by residues 115 - 143 (chain A) in PDB entry 2G7S


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 PRO 115 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  TYR*     3.4    44.2    -      -       +      +
     51A  SER*     3.6    23.3    -      -       -      -
    113A  VAL      4.2     2.0    -      -       -      +
    114A  LEU*     1.3    89.9    -      -       +      +
    116A  GLU*     1.3    66.1    +      -       -      +
    117A  THR*     4.0     6.1    -      -       -      +
    118A  VAL*     3.0    22.9    +      -       +      +
    119A  VAL*     3.0    11.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 116 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  LEU      3.4     3.7    +      -       -      +
    115A  PRO*     1.3    71.8    -      -       -      +
    117A  THR*     1.3    65.2    +      -       +      +
    119A  VAL*     3.2    10.5    +      -       -      +
    120A  LEU*     3.0    28.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 117 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  SER*     4.2     8.7    +      -       -      -
     55A  CYS*     3.4    25.6    -      -       -      -
    115A  PRO*     4.0    10.9    -      -       -      +
    116A  GLU*     1.3    79.9    -      -       +      +
    118A  VAL*     1.3    61.5    +      -       -      +
    120A  LEU*     3.4    25.1    +      -       +      +
    121A  GLU*     3.5    12.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 118 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  TYR*     4.4     0.9    -      -       +      -
     51A  SER*     3.8    23.3    -      -       -      +
     54A  VAL*     3.9    30.5    -      -       +      -
     55A  CYS*     3.8     9.4    -      -       -      +
     58A  VAL*     4.8     4.0    -      -       +      -
    107A  LEU*     4.3     4.5    -      -       +      -
    114A  LEU*     4.1    22.9    -      -       +      -
    115A  PRO*     3.0    33.0    +      -       +      +
    117A  THR*     1.3    73.7    -      -       -      +
    119A  VAL*     1.3    68.4    +      -       -      +
    121A  GLU*     3.0     6.8    +      -       -      +
    122A  VAL*     3.0    29.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 119 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111A  ILE*     3.8    30.3    -      -       +      +
    114A  LEU*     3.7    24.2    -      -       +      +
    115A  PRO      3.0    14.4    +      -       -      +
    116A  GLU*     3.2    12.1    +      -       -      +
    118A  VAL*     1.3    77.4    -      -       -      +
    120A  LEU*     1.4    63.2    +      -       +      +
    122A  VAL*     3.2     6.5    +      -       -      +
    123A  ARG*     2.9    64.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 120 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116A  GLU*     3.0    22.3    +      -       +      +
    117A  THR*     3.5    19.1    -      -       +      +
    118A  VAL      3.2     0.4    -      -       -      -
    119A  VAL*     1.4    78.7    -      -       +      +
    121A  GLU*     1.3    63.6    +      -       +      +
    123A  ARG*     3.5     7.0    +      -       -      +
    124A  ALA*     3.0    24.8    +      -       -      +
    127A  ARG*     4.9     1.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 121 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55A  CYS*     4.2    23.2    -      -       -      +
     58A  VAL*     3.6    18.4    -      -       +      -
     59A  SER*     3.6    31.8    +      -       -      -
     62A  ARG*     3.3    36.6    +      -       -      +
    117A  THR      3.5    11.6    +      -       -      +
    118A  VAL*     3.0     9.0    +      -       -      +
    120A  LEU*     1.3    75.5    -      -       +      +
    122A  VAL*     1.3    65.8    +      -       -      +
    124A  ALA*     3.3     2.1    +      -       -      +
    125A  HIS      3.1    17.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 122 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  VAL*     4.7     2.7    -      -       +      -
    104A  CYS*     3.5    34.8    -      -       -      +
    107A  LEU*     3.7    34.3    -      -       +      -
    108A  ALA*     3.9    21.1    -      -       +      +
    111A  ILE*     4.3     9.4    -      -       +      -
    114A  LEU*     4.7     2.2    -      -       +      -
    118A  VAL*     3.0    23.3    +      -       +      +
    119A  VAL*     3.2     9.4    +      -       -      +
    121A  GLU*     1.3    78.1    -      -       -      +
    123A  ARG*     1.3    62.8    +      -       -      +
    125A  HIS*     3.1    12.5    +      -       -      +
    126A  PHE*     3.2    18.3    +      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 123 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111A  ILE*     3.8    32.1    -      -       +      +
    119A  VAL*     2.9    42.9    +      -       +      +
    120A  LEU*     4.1     7.0    -      -       -      +
    122A  VAL*     1.3    76.2    -      -       -      +
    124A  ALA*     1.3    62.1    +      -       -      +
    126A  PHE*     3.1    10.2    +      -       -      +
    127A  ARG*     3.0    37.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 124 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62A  ARG*     3.0    36.4    +      -       -      +
    120A  LEU      3.0    17.3    +      -       -      +
    121A  GLU*     3.6     0.9    -      -       -      +
    122A  VAL      3.2     0.2    -      -       -      -
    123A  ARG*     1.3    77.5    -      -       -      +
    125A  HIS*     1.3    60.9    +      -       -      +
    127A  ARG*     3.6    27.2    +      -       -      +
    128A  SER*     3.0    26.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 125 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61A  TYR*     4.2    15.8    -      +       -      -
     62A  ARG*     3.4    26.6    -      -       -      +
     65A  ALA*     4.4    15.1    -      -       +      +
     66A  GLU*     6.1     1.8    -      -       -      +
    102A  CYS*     3.9    14.6    -      -       -      -
    104A  CYS*     3.5    35.2    -      -       +      -
    121A  GLU      3.1     4.8    +      -       -      -
    122A  VAL      3.1    10.1    +      -       -      +
    124A  ALA*     1.3    75.6    -      -       -      +
    126A  PHE*     1.3    78.8    +      +       -      +
    128A  SER*     3.7     2.8    -      -       -      -
    129A  LEU*     2.9    50.6    +      -       +      +
    164A  HIS*     4.9     3.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 126 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104A  CYS*     3.7    18.8    -      -       +      -
    105A  ALA*     4.1     6.3    -      -       -      -
    108A  ALA*     3.5    32.5    -      -       +      -
    122A  VAL*     3.2    18.3    +      -       +      -
    123A  ARG*     3.1    11.7    +      -       -      +
    125A  HIS*     1.3    87.8    -      +       -      +
    127A  ARG*     1.3    64.4    +      -       +      +
    130A  SER*     3.0    25.8    +      -       -      -
    160A  MSE      3.5    29.6    -      -       +      +
    164A  HIS*     3.6    31.0    -      +       -      -
----------------------------------------------------------
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Residues in contact with ARG 127 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62A  ARG*     5.5     0.6    -      -       -      +
    120A  LEU      4.9     1.8    +      -       -      -
    123A  ARG*     3.0    22.0    +      -       +      +
    124A  ALA*     3.6    38.0    +      -       -      +
    126A  PHE*     1.3    78.1    -      -       +      +
    128A  SER*     1.3    57.5    +      -       -      +
    130A  SER*     3.4     5.4    +      -       -      -
    131A  ASP*     2.9    40.6    +      -       -      +
    153A  ARG*     5.7     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 128 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62A  ARG*     4.2    10.3    -      -       -      -
     66A  GLU*     3.3    30.1    +      -       -      +
    124A  ALA      3.0    20.0    +      -       -      -
    125A  HIS*     3.8     4.9    -      -       -      -
    127A  ARG*     1.3    74.3    -      -       -      +
    129A  LEU*     1.3    59.7    +      -       -      +
    131A  ASP*     3.1    11.9    +      -       -      +
    132A  TRP*     2.9    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 129 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69A  ILE*     4.5    12.6    -      -       +      -
     86A  TYR*     3.5    37.7    -      -       +      +
    125A  HIS*     2.9    45.4    +      -       +      +
    128A  SER*     1.3    71.6    +      -       -      +
    130A  SER*     1.3    62.8    +      -       -      +
    132A  TRP*     3.2    13.0    +      -       +      +
    133A  LEU*     2.9    40.7    +      -       +      +
    160A  MSE      3.7    29.6    -      -       +      -
    163A  VAL*     5.9     0.2    -      -       +      -
    164A  HIS*     4.2     8.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 130 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126A  PHE      3.0    19.9    +      -       -      -
    127A  ARG*     3.5     5.8    -      -       -      -
    129A  LEU*     1.3    76.5    -      -       -      +
    131A  ASP*     1.3    57.7    +      -       -      +
    133A  LEU*     3.4     6.2    +      -       -      -
    134A  THR*     2.7    34.8    +      -       -      -
    153A  ARG*     2.8    25.5    +      -       -      -
    156A  ALA*     3.7     6.5    -      -       -      +
    157A  GLU*     2.7    31.4    +      -       -      +
    160A  MSE      3.9    11.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 131 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127A  ARG*     2.9    27.8    +      -       -      +
    128A  SER*     3.1    11.5    +      -       -      +
    130A  SER*     1.3    75.8    -      -       -      +
    132A  TRP*     1.3    63.2    +      -       -      +
    134A  THR*     3.4     4.5    +      -       -      -
    135A  ALA*     3.0    24.1    +      -       -      +
    153A  ARG*     2.9    34.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 132 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69A  ILE*     3.5    61.7    +      -       +      -
     70A  ALA*     5.4     0.7    -      -       -      -
     72A  LEU*     4.5     4.9    -      -       +      -
     73A  GLU*     2.9    33.3    +      -       +      -
     82A  GLN*     4.3    27.4    -      -       +      -
     83A  LEU*     4.7     2.0    -      -       +      -
     86A  TYR*     4.2    22.9    -      +       +      -
    128A  SER      2.9    12.4    +      -       -      +
    129A  LEU*     3.7     9.2    -      -       +      +
    131A  ASP*     1.3    74.6    -      -       -      +
    133A  LEU*     1.3   101.0    +      -       +      +
    135A  ALA*     3.1     9.3    +      -       +      +
    136A  VAL*     2.9    48.4    +      -       +      +
    139A  ARG*     5.5     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 133 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83A  LEU*     3.7    20.1    -      -       +      +
     86A  TYR*     4.5     7.2    -      -       +      +
    129A  LEU*     2.9    32.2    +      -       +      +
    130A  SER*     4.7     0.7    -      -       -      -
    132A  TRP*     1.3    97.8    -      -       +      +
    134A  THR*     1.3    57.3    +      -       -      +
    136A  VAL*     3.3     3.7    +      -       -      +
    137A  LEU*     2.9    36.4    +      -       +      +
    156A  ALA*     3.8    33.2    -      -       +      +
    159A  PHE*     3.6    33.2    -      -       +      -
    160A  MSE      3.9    18.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 134 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130A  SER      2.7    23.7    +      -       -      -
    131A  ASP*     3.6     5.8    -      -       -      +
    133A  LEU*     1.3    77.6    -      -       -      +
    135A  ALA*     1.3    58.0    +      -       -      +
    137A  LEU*     3.3     3.0    +      -       -      +
    138A  GLU*     2.9    53.8    +      -       -      +
    152A  ALA*     3.8     4.4    -      -       +      +
    153A  ARG*     3.4    49.8    +      -       +      +
    156A  ALA*     3.2    17.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 135 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131A  ASP      3.0    17.8    +      -       -      +
    132A  TRP*     3.1     7.2    +      -       +      +
    134A  THR*     1.3    75.3    -      -       -      +
    136A  VAL*     1.3    64.5    +      -       -      +
    138A  GLU*     3.3    15.2    +      -       -      +
    139A  ARG*     2.9    43.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 136 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79A  PRO*     3.3    33.6    -      -       +      +
     82A  GLN*     3.7    10.8    -      -       +      +
     83A  LEU*     3.6    23.3    -      -       +      -
    132A  TRP*     2.9    47.5    +      -       +      +
    133A  LEU      3.7     5.6    -      -       -      +
    135A  ALA*     1.3    75.5    -      -       -      +
    137A  LEU*     1.4    59.0    +      -       -      +
    139A  ARG*     3.2    25.2    +      -       -      +
    140A  GLY      2.9    24.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 137 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83A  LEU*     3.9    15.7    -      -       +      -
    133A  LEU*     2.9    23.2    +      -       +      +
    134A  THR      3.7     3.6    -      -       -      +
    136A  VAL*     1.4    76.0    -      -       -      +
    138A  GLU*     1.3    62.7    +      -       -      +
    140A  GLY*     3.1     2.1    +      -       -      -
    141A  ILE*     2.9    26.7    +      -       -      +
    146A  LEU*     3.7    24.0    -      -       +      +
    148A  LEU*     4.2    14.5    -      -       +      +
    152A  ALA*     3.5    19.3    -      -       +      +
    155A  ASN*     3.9    10.8    -      -       +      +
    156A  ALA*     3.5    33.2    -      -       -      +
    159A  PHE*     5.6     2.5    -      -       +      -
    186A  MSE      5.0     4.3    -      -       +      -
    190A  ILE*     3.9    20.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 138 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134A  THR*     2.9    32.6    +      -       -      +
    135A  ALA*     3.5    21.5    +      -       -      +
    137A  LEU*     1.3    78.3    -      -       -      +
    139A  ARG*     1.4    59.0    +      -       +      +
    141A  ILE*     3.2     9.0    +      -       -      +
    142A  ALA*     2.8    28.5    +      -       -      +
    152A  ALA*     3.5    18.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 139 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  GLU*     3.5    35.0    +      -       -      +
     79A  PRO*     3.7    12.7    -      -       +      +
     82A  GLN*     2.7    33.1    +      -       -      +
    132A  TRP*     5.8     0.4    -      -       -      -
    135A  ALA*     2.9    45.4    +      -       -      +
    136A  VAL*     3.4    20.3    -      -       -      +
    138A  GLU*     1.4    76.0    -      -       +      +
    140A  GLY*     1.3    57.6    +      -       -      +
    142A  ALA*     4.2     7.0    -      -       -      -
    143A  GLN*     2.9    46.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 140 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79A  PRO*     3.5    20.1    -      -       -      +
    136A  VAL      2.9    11.9    +      -       -      -
    137A  LEU      3.1     3.8    +      -       -      -
    139A  ARG*     1.3    77.6    -      -       -      +
    141A  ILE*     1.3    59.6    +      -       -      +
    143A  GLN      3.5     0.3    +      -       -      -
    144A  GLY      3.2     2.6    +      -       -      -
    145A  ARG*     2.8    33.4    +      -       -      -
    146A  LEU*     3.4    20.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 141 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137A  LEU      2.9    17.9    +      -       -      +
    138A  GLU*     3.5     9.4    -      -       -      +
    140A  GLY*     1.3    75.2    -      -       -      +
    142A  ALA*     1.3    68.0    +      -       -      +
    144A  GLY*     3.0    13.9    +      -       -      -
    146A  LEU*     3.4    23.8    -      -       +      +
    147A  VAL*     4.4     0.7    -      -       -      -
    148A  LEU*     4.1    37.7    -      -       +      +
    152A  ALA*     5.9     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 142 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  GLU      2.8    19.8    +      -       -      +
    139A  ARG*     3.2     9.4    +      -       +      +
    141A  ILE*     1.3    76.1    -      -       -      +
    143A  GLN*     1.3    61.1    +      -       +      +
    144A  GLY      3.4     0.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 143 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77A  SER      4.1     9.2    +      -       -      +
     78A  ASP*     4.8     0.9    -      -       -      -
     79A  PRO*     3.2    29.5    -      -       -      +
    139A  ARG*     2.9    35.2    +      -       -      +
    140A  GLY      4.1     0.2    -      -       -      +
    142A  ALA*     1.3    81.0    -      -       +      +
    144A  GLY*     1.3    61.9    +      -       -      +
    145A  ARG*     3.2    22.7    +      -       +      +
----------------------------------------------------------
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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