Contacts of the helix formed by residues 164 - 188 (chain A) in PDB entry 4WTM


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 ASP 164 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98A  ARG      4.5     1.0    -      -       -      +
     99A  SER*     2.7    22.7    +      -       -      -
    100A  LYS*     3.0    36.3    +      -       +      +
    101A  TYR*     3.9    17.0    -      -       +      -
    118A  HIS*     4.3     1.9    +      -       -      -
    134A  ILE*     5.7     0.2    -      -       -      +
    135A  PRO      4.7     3.6    +      -       -      -
    162A  TYR*     5.5     0.9    -      -       -      -
    163A  PRO*     1.3    77.5    -      -       -      +
    165A  LEU*     1.3    67.4    +      -       -      +
    166A  GLY*     3.1    19.7    +      -       -      +
    167A  VAL*     2.9    24.4    +      -       +      +
    168A  ARG*     3.0    10.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 165 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92A  THR*     4.0    24.7    -      -       +      -
     96A  SER*     4.1     1.8    -      -       -      +
     97A  ALA      3.5    21.3    +      -       -      +
     98A  ARG*     4.1     1.2    +      -       -      -
     99A  SER*     3.8    24.0    -      -       -      +
    103A  PHE*     4.2     6.5    -      -       +      -
    104A  GLY*     3.9    26.5    -      -       -      -
    105A  ALA*     4.0     3.6    -      -       -      +
    108A  VAL*     3.9    16.2    -      -       +      -
    164A  ASP*     1.3    75.0    +      -       -      +
    166A  GLY*     1.3    63.5    +      -       -      +
    168A  ARG*     3.1    33.9    +      -       +      +
    169A  VAL*     3.0    29.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 166 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99A  SER*     4.8     1.6    +      -       -      -
    103A  PHE*     4.9     1.5    -      -       -      -
    118A  HIS*     4.3    13.2    -      -       -      -
    119A  ILE*     4.0    23.5    -      -       -      +
    122A  VAL*     4.1     6.5    -      -       -      +
    164A  ASP*     3.1    13.7    +      -       -      -
    165A  LEU*     1.3    78.4    -      -       -      +
    167A  VAL*     1.3    62.6    +      -       -      +
    169A  VAL*     3.4     4.0    +      -       -      +
    170A  CYS*     3.2    25.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 167 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122A  VAL*     4.0    22.4    -      -       +      -
    126A  LEU*     5.9     1.6    -      -       +      -
    134A  ILE*     4.3    27.8    -      -       +      -
    163A  PRO*     3.8    22.7    -      -       +      -
    164A  ASP*     2.9    20.0    +      -       +      +
    166A  GLY*     1.3    72.4    -      -       -      +
    168A  ARG*     1.3    61.3    +      -       -      +
    170A  CYS*     2.9     5.3    +      -       +      +
    171A  GLU*     2.8    35.2    +      -       +      +
    256A  LEU*     4.5     9.0    -      -       +      -
    260A  LEU*     4.1    16.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 168 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96A  SER*     2.7    24.0    +      -       -      -
     97A  ALA*     2.7    31.1    +      -       -      +
     98A  ARG      5.4     0.6    +      -       -      -
    162A  TYR*     3.6    14.9    -      -       -      -
    163A  PRO*     2.9    38.8    +      -       +      +
    164A  ASP*     3.0    10.6    +      -       -      +
    165A  LEU*     3.1    33.7    +      -       +      +
    167A  VAL*     1.3    75.9    -      -       -      +
    169A  VAL*     1.3    62.2    +      -       -      +
    171A  GLU*     3.3    15.5    +      -       -      +
    172A  LYS*     3.3    31.2    +      -       -      +
    283A  GLY      4.6     1.3    -      -       -      -
    285A  LEU*     5.5     0.3    -      -       -      +
      2T    A      3.3    36.4    +      -       -      -
      3T    G      3.5    17.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 169 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85A  LEU      4.3     2.0    -      -       -      +
     88A  ALA*     3.6    21.1    -      -       +      +
     89A  CYS*     3.9    17.7    -      -       -      +
     92A  THR*     3.7    22.0    -      -       -      +
    108A  VAL*     4.1     9.4    -      -       +      -
    119A  ILE*     4.0    33.4    -      -       +      -
    165A  LEU*     3.0    21.5    +      -       +      +
    166A  GLY      3.7     7.0    -      -       -      +
    167A  VAL      3.2     0.2    -      -       -      -
    168A  ARG*     1.3    77.7    -      -       -      +
    170A  CYS*     1.3    63.4    +      -       -      +
    172A  LYS*     3.1    18.9    +      -       -      +
    173A  MET*     3.2    10.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 170 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  ILE*     3.8    15.3    -      -       -      -
    122A  VAL*     3.6    20.0    -      -       -      -
    123A  TRP*     3.6    43.7    -      -       +      -
    126A  LEU*     3.8    13.7    -      -       +      -
    166A  GLY      3.2    15.6    +      -       -      +
    167A  VAL*     2.9    10.8    +      -       -      +
    169A  VAL*     1.3    76.1    -      -       -      +
    171A  GLU*     1.3    65.6    +      -       -      +
    173A  MET*     2.9    22.3    +      -       -      +
    174A  ALA*     3.0    12.1    +      -       -      +
    256A  LEU*     4.8     1.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 171 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163A  PRO*     3.6    18.2    -      -       -      +
    167A  VAL      2.8    17.6    +      -       -      +
    168A  ARG*     3.6    23.2    -      -       -      +
    169A  VAL      3.3     0.2    -      -       -      -
    170A  CYS*     1.3    75.3    -      -       -      +
    172A  LYS*     1.3    58.8    +      -       -      +
    174A  ALA*     3.3     1.0    +      -       -      +
    175A  LEU*     2.8    33.1    +      -       -      +
    256A  LEU*     3.9    24.0    -      -       +      +
    260A  LEU*     3.9    11.2    -      -       +      -
    261A  TYR*     2.6    33.3    +      -       -      +
    283A  GLY      4.9     0.2    -      -       -      +
    284A  VAL*     3.5     3.7    -      -       -      +
    285A  LEU*     2.8    39.7    +      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 172 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83A  LEU*     3.9     4.7    -      -       +      +
     88A  ALA*     4.0    18.4    -      -       +      +
     91A  LEU*     3.9    40.7    +      -       +      -
     92A  THR*     4.3     8.5    -      -       -      +
     93A  PRO*     5.0     3.6    -      -       -      +
    168A  ARG*     3.4    20.2    +      -       -      +
    169A  VAL*     3.1     8.2    +      -       -      +
    170A  CYS      3.1     0.6    -      -       -      -
    171A  GLU*     1.3    76.9    -      -       -      +
    173A  MET*     1.3    67.3    +      -       -      +
    176A  TYR*     3.0    36.5    +      -       +      +
    285A  LEU*     3.7    19.5    -      -       +      +
      3T    G      3.2    21.4    +      -       -      -
      4T    G      3.0    28.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 173 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81A  ARG      4.3     1.2    -      -       -      +
     82A  LEU*     3.5    12.8    -      -       +      -
     83A  LEU*     3.1    42.9    +      -       -      +
     84A  THR*     5.2     0.2    -      -       -      -
     85A  LEU*     3.7    42.8    -      -       +      +
     88A  ALA*     3.5    20.9    -      -       +      -
    119A  ILE*     4.6     3.1    -      -       -      -
    123A  TRP*     3.8    40.6    -      -       +      +
    169A  VAL*     3.2     3.1    +      -       -      +
    170A  CYS*     2.9    28.3    +      -       -      +
    172A  LYS*     1.3    79.8    -      -       -      +
    174A  ALA*     1.3    61.0    +      -       -      +
    176A  TYR      4.8     0.2    +      -       -      -
    177A  ASP      5.7     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 174 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81A  ARG      4.7     6.1    -      -       -      +
     82A  LEU*     4.1     9.9    -      -       -      -
    123A  TRP*     4.0    11.4    -      -       +      -
    170A  CYS      3.0    10.5    +      -       -      +
    171A  GLU      3.7     6.7    -      -       -      +
    173A  MET*     1.3    81.0    -      -       -      +
    175A  LEU*     1.3    64.4    +      -       +      +
    177A  ASP      5.4     0.2    +      -       -      -
    178A  ILE*     4.2     5.4    -      -       -      +
    249A  ALA*     4.5     7.4    -      -       -      +
    252A  ALA*     4.1    11.7    -      -       +      -
    253A  ILE*     3.9    19.6    -      -       +      +
    256A  LEU*     3.9    20.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 175 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171A  GLU      2.8    16.3    +      -       -      +
    174A  ALA*     1.3    76.5    -      -       -      +
    176A  TYR*     1.3    65.6    +      -       -      +
    177A  ASP      3.2     2.9    -      -       -      -
    178A  ILE*     3.1    23.8    +      -       +      +
    179A  THR*     3.0    21.6    +      -       +      +
    240A  TYR*     4.0    23.8    -      -       +      -
    253A  ILE*     3.8    31.2    -      -       +      -
    256A  LEU*     4.1    17.7    -      -       +      -
    261A  TYR*     3.4    38.6    -      -       +      +
    285A  LEU*     3.8    10.5    -      -       +      -
    286A  THR*     4.1    10.3    -      -       +      -
    289A  MET*     4.6     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 176 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83A  LEU*     3.7    26.2    -      -       +      -
     91A  LEU*     4.0    29.8    -      -       +      +
    172A  LYS*     3.0    35.9    +      -       +      +
    173A  MET      4.8     0.2    +      -       -      -
    175A  LEU*     1.3    77.6    -      -       -      +
    177A  ASP*     1.3    65.5    +      -       -      +
    179A  THR*     2.5    26.7    +      -       -      -
    180A  GLN*     3.2    43.0    +      -       +      +
    285A  LEU*     3.9    10.2    -      -       +      +
      4T    G      4.2    25.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 177 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80A  ALA*     3.2     3.4    -      -       +      -
     81A  ARG*     2.8    57.2    +      -       -      +
     83A  LEU*     4.3    11.6    -      -       +      +
    175A  LEU      3.2     0.8    -      -       -      -
    176A  TYR*     1.3    83.6    -      -       -      +
    178A  ILE*     1.3    62.7    +      -       -      +
    180A  GLN*     3.2    15.7    +      -       -      +
    181A  LYS*     2.8    52.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 178 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78A  VAL*     5.6     1.1    -      -       +      -
     80A  ALA*     3.5    20.2    -      -       +      -
    174A  ALA      4.2     7.9    -      -       -      +
    175A  LEU*     3.1    17.1    +      -       +      +
    177A  ASP*     1.3    73.3    -      -       +      +
    179A  THR*     1.3    65.7    +      -       -      +
    180A  GLN      3.0     1.3    -      -       -      -
    181A  LYS*     2.9     2.8    +      -       -      +
    182A  LEU*     2.8    50.3    +      -       +      +
    240A  TYR*     4.3    13.0    -      -       +      +
    243A  CYS*     4.7     7.4    -      -       -      -
    245A  LEU*     3.8    24.7    -      -       +      -
    253A  ILE*     3.9    22.7    -      -       +      -
    289A  MET*     3.6    23.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 179 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175A  LEU*     3.0    19.4    +      -       +      +
    176A  TYR*     2.5    27.9    +      -       -      -
    178A  ILE*     1.3    74.9    -      -       -      +
    180A  GLN*     1.3    72.5    +      -       -      +
    181A  LYS      3.6     0.2    +      -       -      -
    183A  PRO*     3.8    15.1    -      -       -      +
    191A  TYR*     5.1     3.5    +      -       -      -
    285A  LEU*     4.3    31.9    -      -       +      +
    289A  MET*     3.7    32.9    -      -       +      +
      4T    G      5.1     9.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 180 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    176A  TYR*     3.4    48.7    +      -       +      +
    177A  ASP*     3.2    14.1    +      -       -      +
    178A  ILE      3.0     1.0    -      -       -      -
    179A  THR*     1.3    95.1    +      -       -      +
    181A  LYS*     1.3    64.6    +      -       +      +
    183A  PRO*     5.1     0.4    -      -       -      -
    184A  GLN*     5.5     3.6    -      -       -      +
      4T    G      3.9    15.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 181 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78A  VAL*     4.1    17.9    -      -       +      -
     79A  SER      3.1    25.1    +      -       -      +
     80A  ALA*     4.1     0.9    -      -       -      +
     81A  ARG*     4.8     3.6    -      -       -      +
    177A  ASP*     2.8    47.3    +      -       -      +
    178A  ILE      2.9     5.4    +      -       -      +
    179A  THR      3.4     0.2    -      -       -      -
    180A  GLN*     1.3    85.7    -      -       +      +
    182A  LEU*     1.3    63.9    +      -       -      +
    183A  PRO*     3.6     1.6    -      -       -      -
    184A  GLN*     3.7     8.5    +      -       -      +
    185A  ALA*     3.1    23.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 182 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75A  ALA*     3.7    23.6    -      -       +      -
     78A  VAL*     4.4     5.8    -      -       +      +
    178A  ILE*     2.8    30.6    +      -       +      +
    181A  LYS*     1.3    70.0    -      -       -      +
    183A  PRO*     1.4    73.8    -      -       +      +
    185A  ALA*     2.7    16.1    +      -       -      +
    186A  VAL*     2.9    22.6    +      -       +      +
    239A  ILE*     4.1    10.3    -      -       +      -
    240A  TYR*     3.7    33.9    -      -       +      -
    243A  CYS*     3.7    22.4    -      -       -      -
    289A  MET*     4.1     1.3    -      -       -      -
    293A  ILE*     3.8    20.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 183 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178A  ILE      3.7     7.4    -      -       -      +
    179A  THR      3.8    14.8    -      -       -      +
    180A  GLN      5.1     0.2    -      -       -      -
    181A  LYS      3.9     1.1    -      -       -      -
    182A  LEU*     1.4    93.5    -      -       +      +
    184A  GLN*     1.3    62.9    +      -       -      +
    186A  VAL*     3.3     7.3    +      -       +      -
    187A  MET*     3.0    35.8    +      -       -      +
    191A  TYR*     3.6    39.9    -      -       +      +
    289A  MET*     3.9    28.7    -      -       +      -
    292A  THR*     5.5     1.3    -      -       +      -
    293A  ILE*     4.6     6.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 184 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    180A  GLN      5.5     2.7    -      -       -      +
    181A  LYS*     3.7    10.6    +      -       -      +
    182A  LEU      3.2     0.8    -      -       -      -
    183A  PRO*     1.3    79.7    -      -       -      +
    185A  ALA*     1.3    59.3    +      -       -      +
    188A  GLY*     2.9    42.1    +      -       -      +
    191A  TYR*     4.2    16.0    -      -       +      -
    194A  GLN*     3.2    39.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 185 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74A  ALA*     3.9    19.7    -      -       -      +
     77A  LYS*     6.2     0.7    -      -       +      -
     78A  VAL*     3.4    28.9    -      -       +      -
    181A  LYS      3.1    14.6    +      -       -      +
    182A  LEU      2.7    10.3    +      -       -      +
    184A  GLN*     1.3    81.8    -      -       -      +
    186A  VAL*     1.3    62.4    +      -       +      +
    188A  GLY*     4.7     1.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 186 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  ILE*     3.7    43.6    -      -       +      +
     74A  ALA*     4.0     9.7    -      -       +      +
     75A  ALA*     3.8    10.1    -      -       +      +
    182A  LEU*     2.9    32.5    +      -       +      +
    183A  PRO*     3.6     4.7    -      -       +      +
    185A  ALA*     1.3    79.6    -      -       -      +
    187A  MET*     1.3    72.6    +      -       +      +
    188A  GLY      3.9     0.2    -      -       -      -
    239A  ILE*     5.0     1.8    -      -       +      -
    293A  ILE*     4.3    21.5    -      -       +      -
    296A  TYR*     3.7    19.7    +      -       +      -
----------------------------------------------------------
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Residues in contact with MET 187 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183A  PRO*     3.0    18.7    +      -       -      +
    186A  VAL*     1.3    90.9    -      -       +      +
    188A  GLY*     1.3    65.8    +      -       -      +
    189A  ALA      3.3     0.9    +      -       -      -
    190A  SER*     3.0    35.4    +      -       -      +
    191A  TYR*     3.9    19.5    -      -       +      +
    292A  THR*     3.7    26.2    -      -       +      +
    293A  ILE*     4.8     3.6    -      -       -      -
    296A  TYR*     3.6    49.5    +      -       +      -
    315A  VAL*     3.7    24.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 188 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    184A  GLN*     2.9    34.3    +      -       -      -
    185A  ALA      4.6     0.8    +      -       -      -
    186A  VAL      3.9     0.4    -      -       -      -
    187A  MET*     1.3    77.2    -      -       -      +
    189A  ALA*     1.3    61.9    -      -       -      -
    190A  SER      3.1     1.2    +      -       -      -
    191A  TYR*     3.1    10.7    +      -       -      +
    194A  GLN*     2.9    17.5    +      -       -      -
----------------------------------------------------------
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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