Contacts of the helix formed by residues 486 - 509 (chain A) in PDB entry 4WMJ


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 THR 486 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52A  ASP*     2.7    28.5    +      -       +      +
    175A  LEU*     3.8     4.9    -      -       -      -
    178A  TYR*     3.4    15.7    -      -       -      +
    484A  LYS*     3.7    25.1    -      -       +      +
    485A  PHE*     1.3    77.5    -      -       -      +
    487A  PRO*     1.4    77.7    -      -       -      +
    488A  PHE      3.1     2.5    +      -       -      -
    489A  THR*     3.0    19.4    +      -       +      +
    490A  LEU*     2.9    23.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 487 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175A  LEU*     3.9    26.9    -      -       +      -
    178A  TYR*     3.5    27.1    -      -       +      -
    291A  ILE*     4.7     0.2    -      -       +      -
    295A  ASN*     3.4    48.0    -      -       +      +
    298A  LYS*     3.8     9.6    -      -       +      -
    299A  LEU*     3.3    20.5    -      -       -      +
    486A  THR*     1.4    86.6    -      -       -      +
    488A  PHE*     1.3    60.8    +      -       -      +
    491A  GLY      3.0    18.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 488 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49A  THR*     3.7    27.4    -      -       +      -
     50A  PRO*     4.2    15.7    -      -       +      -
     51A  ASN      6.2     0.2    -      -       -      -
     52A  ASP*     3.5    34.5    -      -       +      +
    298A  LYS*     3.4    21.5    +      -       +      +
    301A  ASP*     3.7    24.9    -      -       +      -
    302A  GLY*     3.3    19.3    -      -       -      -
    305A  PHE*     3.5    35.0    -      +       +      -
    486A  THR*     3.1     1.4    +      -       -      -
    487A  PRO*     1.3    80.2    -      -       -      +
    489A  THR*     1.3    67.2    +      -       -      +
    491A  GLY      3.3     0.3    +      -       -      -
    492A  ALA*     3.0    20.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 489 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49A  THR*     5.3     0.9    -      -       +      -
     52A  ASP*     3.8    33.2    -      -       +      +
     55A  ILE*     4.8    12.3    -      -       +      +
    482A  VAL*     4.3    21.5    -      -       +      -
    484A  LYS      2.8    28.1    +      -       -      +
    485A  PHE*     3.4     6.6    -      -       -      -
    486A  THR*     3.0    16.7    +      -       +      +
    488A  PHE*     1.3    79.1    -      -       +      +
    490A  LEU*     1.3    63.3    +      -       -      +
    492A  ALA*     3.4     6.4    +      -       -      +
    493A  LEU*     3.0    28.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 490 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170A  MET*     4.7     1.6    -      -       -      -
    171A  VAL*     4.2    15.3    -      -       +      -
    174A  ALA*     3.7    25.4    -      -       +      -
    175A  LEU*     3.9    24.0    -      -       +      -
    299A  LEU*     4.3     2.5    -      -       +      -
    348A  LEU*     3.9    27.6    -      -       +      -
    351A  PHE*     4.4     9.4    -      -       +      -
    485A  PHE*     5.3     9.4    -      -       +      -
    486A  THR      2.9    17.8    +      -       -      +
    487A  PRO      3.9     2.0    -      -       -      +
    489A  THR*     1.3    80.7    +      -       -      +
    491A  GLY*     1.3    57.7    +      -       -      +
    493A  LEU*     3.1     7.7    +      -       +      -
    494A  ILE*     2.9    54.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 491 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    280A  TRP*     3.7    10.2    -      -       -      -
    299A  LEU*     3.6    34.0    -      -       -      +
    303A  ALA*     3.5     9.4    -      -       -      -
    487A  PRO      3.0    12.2    +      -       -      -
    488A  PHE      3.8     0.2    -      -       -      -
    490A  LEU*     1.3    74.7    -      -       -      +
    492A  ALA*     1.3    62.1    +      -       -      +
    495A  ALA*     3.0    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 492 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55A  ILE*     4.0    24.5    -      -       +      -
    302A  GLY*     3.3    23.5    -      -       -      +
    305A  PHE*     4.4     6.7    -      -       +      -
    306A  MET*     3.3    24.1    -      -       +      +
    488A  PHE*     3.0    16.8    +      -       +      +
    489A  THR*     3.6     6.1    -      -       -      +
    491A  GLY*     1.3    75.8    -      -       -      +
    493A  LEU*     1.3    57.4    +      -       -      +
    496A  MET*     2.9    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 493 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55A  ILE*     4.4    18.6    -      -       +      -
    306A  MET*     5.8     0.4    -      -       +      -
    348A  LEU*     6.1     0.4    -      -       +      -
    351A  PHE*     4.9    13.9    -      -       +      -
    410A  LEU*     4.3    14.6    -      -       +      -
    480A  ILE*     4.0    17.5    -      -       +      -
    482A  VAL*     4.1    12.3    -      -       +      -
    485A  PHE*     3.7    31.2    -      -       +      -
    489A  THR      3.0    21.4    +      -       -      +
    490A  LEU*     3.7     7.2    -      -       +      +
    492A  ALA*     1.3    77.1    -      -       +      +
    494A  ILE*     1.3    67.3    +      -       -      +
    496A  MET*     3.2    27.9    +      -       +      +
    497A  TYR*     3.2    30.7    +      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 494 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170A  MET*     3.9    24.0    -      -       +      -
    171A  VAL*     4.1    14.1    -      -       +      -
    279A  LEU*     4.5     3.4    -      -       +      -
    280A  TRP*     3.4    32.3    -      -       +      -
    299A  LEU*     4.6     3.1    -      -       +      -
    351A  PHE*     4.4     5.8    -      -       +      -
    354A  TYR*     4.1    14.1    -      -       +      +
    355A  PHE*     3.6    22.7    -      -       +      -
    490A  LEU*     2.9    45.5    +      -       +      +
    491A  GLY      3.9     0.7    -      -       -      +
    493A  LEU*     1.3    76.4    -      -       -      +
    495A  ALA*     1.3    62.8    +      -       -      +
    497A  TYR      3.2     3.1    +      -       -      -
    498A  GLU*     2.9    26.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 495 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108A  ARG*     3.8    20.2    -      -       -      +
    280A  TRP*     4.3     0.6    -      -       -      -
    303A  ALA*     3.8    19.5    -      -       +      +
    306A  MET*     3.9    11.9    -      -       +      -
    307A  ASP*     4.1     2.2    -      -       -      +
    491A  GLY      3.0    17.9    +      -       -      +
    492A  ALA      3.8     3.4    -      -       -      +
    494A  ILE*     1.3    77.0    -      -       -      +
    496A  MET*     1.3    63.4    +      -       -      +
    498A  GLU*     3.2    13.6    +      -       -      +
    499A  HIS*     3.0    26.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 496 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  ILE*     6.0     0.4    -      -       -      -
     55A  ILE*     5.8     3.4    -      -       -      -
     57A  LEU*     5.4     4.9    -      -       -      -
    306A  MET*     3.4    25.5    -      -       +      +
    319A  ALA*     4.2    14.1    -      -       +      -
    320A  PRO*     3.6    23.7    -      -       +      +
    323A  LEU*     3.7    27.1    -      -       +      -
    480A  ILE*     3.9    15.3    -      -       +      -
    492A  ALA      2.9    16.1    +      -       -      +
    493A  LEU*     3.2    30.2    +      -       +      +
    495A  ALA*     1.3    74.6    -      -       -      +
    497A  TYR*     1.3    88.0    +      -       +      +
    499A  HIS      3.2     1.6    +      -       -      -
    500A  LYS*     2.9    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 497 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    323A  LEU*     4.5     7.2    -      -       +      -
    341A  LEU*     3.5    18.1    -      -       +      +
    351A  PHE*     3.8    28.9    -      +       -      -
    355A  PHE*     3.3    31.6    -      +       +      -
    408A  ASP*     2.7    40.8    +      -       -      +
    410A  LEU*     4.4     9.2    -      -       +      +
    480A  ILE*     3.7     9.4    -      -       -      +
    493A  LEU*     3.2    19.0    +      -       +      -
    494A  ILE      3.2     1.8    +      -       -      +
    496A  MET*     1.3    94.0    -      -       +      +
    498A  GLU*     1.3    68.5    +      -       -      +
    500A  LYS*     3.2    27.9    +      -       +      +
    501A  ILE*     3.0    32.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 498 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104A  HIS*     3.6     6.8    +      -       -      +
    108A  ARG*     2.9    34.0    +      -       -      -
    276A  ARG      5.8     0.2    -      -       -      +
    277A  TYR*     3.6    44.8    +      -       +      -
    280A  TRP*     2.8    30.6    +      -       -      -
    354A  TYR*     4.2     5.7    +      -       -      +
    355A  PHE*     4.2     7.2    -      -       +      -
    494A  ILE*     2.9    24.8    +      -       +      +
    495A  ALA*     3.2     8.7    +      -       -      +
    497A  TYR*     1.3    77.7    -      -       -      +
    499A  HIS*     1.3    60.5    +      -       -      +
    501A  ILE*     3.3     8.9    +      -       -      +
    502A  PHE*     3.0    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 499 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88A  MET*     4.0    14.1    -      -       +      +
     89A  PHE*     4.2     1.1    -      +       -      -
    104A  HIS*     4.7     6.4    +      -       -      -
    105A  VAL*     3.9    19.7    -      -       +      -
    108A  ARG*     3.8     7.3    +      -       -      -
    306A  MET*     4.4     4.9    -      -       +      -
    307A  ASP*     2.7    35.3    +      -       -      -
    310A  PHE*     3.3    44.7    -      +       +      -
    320A  PRO*     3.6    19.5    -      -       +      -
    495A  ALA*     3.0    21.6    +      -       +      +
    498A  GLU*     1.3    75.9    -      -       +      +
    500A  LYS*     1.3    65.6    +      -       -      +
    502A  PHE*     3.6     5.3    -      -       -      +
    503A  THR*     2.8    30.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 500 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    320A  PRO*     3.6    17.5    -      -       -      +
    323A  LEU*     3.8    31.8    -      -       +      +
    324A  ALA*     3.5    16.9    -      -       -      +
    327A  GLY*     5.2     3.3    -      -       -      -
    339A  HIS*     3.6    38.6    +      -       -      -
    359A  ASP*     4.5     9.3    +      -       -      -
    408A  ASP*     4.6     3.6    +      -       -      -
    496A  MET      2.9    14.5    +      -       -      +
    497A  TYR*     3.5    28.0    -      -       +      +
    499A  HIS*     1.3    78.0    -      -       -      +
    501A  ILE*     1.3    66.2    +      -       +      +
    503A  THR      3.2     1.0    +      -       -      -
    504A  GLN*     3.0    47.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 501 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    277A  TYR*     3.6    12.6    -      -       +      +
    355A  PHE*     3.9    20.9    -      -       +      -
    358A  GLY*     3.6     7.6    -      -       -      +
    359A  ASP*     3.6    44.9    -      -       +      +
    362A  SER*     3.5    30.7    -      -       -      -
    363A  ASN*     2.9    32.3    +      -       -      +
    497A  TYR*     3.0    22.7    +      -       +      +
    498A  GLU*     3.5     5.6    -      -       -      +
    500A  LYS*     1.3    79.7    -      -       +      +
    502A  PHE*     1.3    63.7    +      -       -      +
    504A  GLN*     3.4     5.4    +      -       -      +
    505A  GLY      3.1     8.5    +      -       -      -
    512A  SER*     3.8     3.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 502 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81A  VAL*     4.4     4.3    -      -       +      -
     84A  ALA*     3.5    27.6    -      -       +      -
     85A  ARG*     3.6    25.6    -      -       +      -
     88A  MET*     3.9    21.5    -      -       +      -
     94A  ILE*     4.0    16.8    -      -       +      -
    277A  TYR*     5.2     0.2    +      -       -      -
    310A  PHE*     3.8    21.8    -      +       -      -
    498A  GLU      3.0    13.9    +      -       -      +
    499A  HIS*     3.6    11.7    -      -       -      +
    501A  ILE*     1.3    76.5    -      -       -      +
    503A  THR*     1.3    66.7    +      -       -      +
    505A  GLY*     3.1     4.0    +      -       -      -
    506A  VAL*     3.0    43.6    +      -       +      +
    512A  SER*     4.4     6.6    +      -       -      -
    513A  PHE*     3.8    29.6    -      +       +      -
----------------------------------------------------------
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Residues in contact with THR 503 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81A  VAL*     4.0    27.1    -      -       +      +
    310A  PHE*     3.5    23.0    -      -       -      -
    320A  PRO      4.7     0.7    -      -       -      -
    321A  VAL*     4.2    16.2    -      -       +      +
    324A  ALA*     3.4    21.3    -      -       +      -
    325A  LEU*     5.7     0.2    -      -       +      -
    499A  HIS      2.8    21.5    +      -       -      -
    500A  LYS*     3.6     4.5    -      -       -      -
    502A  PHE*     1.3    82.6    -      -       -      +
    504A  GLN*     1.3    60.2    +      -       -      +
    506A  VAL*     3.3     7.7    +      -       -      +
    507A  ILE*     3.1    29.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 504 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    324A  ALA*     3.1    30.8    +      -       +      +
    327A  GLY*     3.6    22.8    -      -       -      -
    328A  VAL*     3.9     4.6    -      -       +      +
    359A  ASP*     4.4    10.6    -      -       -      +
    363A  ASN*     3.8     7.6    +      -       -      +
    380A  PRO*     5.0     3.5    -      -       -      +
    500A  LYS*     3.0    44.7    +      -       -      +
    501A  ILE*     3.8     6.3    -      -       -      +
    503A  THR*     1.3    70.8    -      -       -      +
    505A  GLY*     1.3    65.9    +      -       -      +
    507A  ILE*     3.2     8.8    +      -       -      +
    508A  TRP*     3.0    59.9    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 505 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    363A  ASN*     3.8     3.3    -      -       -      +
    501A  ILE      3.1     7.4    +      -       -      -
    502A  PHE      3.1     4.5    +      -       -      -
    504A  GLN*     1.3    76.2    -      -       -      +
    506A  VAL*     1.3    57.3    +      -       -      +
    508A  TRP      3.5     0.3    +      -       -      -
    509A  ASP*     3.0    22.2    +      -       -      -
    510A  ILE*     3.2    31.8    +      -       -      +
    512A  SER*     3.3    23.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 506 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4A  LYS*     3.7    20.2    +      -       -      +
     79A  ARG      3.4    23.3    -      -       -      +
     81A  VAL*     4.2    14.6    -      -       +      -
     84A  ALA*     3.7    31.6    -      -       +      -
    502A  PHE*     3.0    39.4    +      -       +      +
    503A  THR*     3.6     8.7    -      -       -      +
    504A  GLN      3.2     0.2    -      -       -      -
    505A  GLY*     1.3    74.3    -      -       -      +
    507A  ILE*     1.3    65.5    +      -       -      +
    509A  ASP*     3.0    13.8    +      -       -      +
    510A  ILE      5.5     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 507 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7A  LEU*     3.7    12.6    -      -       +      +
     75A  LEU*     4.0    26.2    -      -       +      +
     76A  ALA*     4.9     0.9    -      -       -      -
     79A  ARG*     3.0    51.9    +      -       +      -
     81A  VAL*     4.2    10.5    -      -       +      -
    324A  ALA*     5.1     1.8    -      -       +      -
    325A  LEU*     3.8    29.4    -      -       +      -
    328A  VAL*     4.3    20.2    -      -       +      -
    503A  THR*     3.1    28.1    +      -       +      +
    504A  GLN*     3.2     7.6    +      -       -      +
    506A  VAL*     1.3    77.4    -      -       -      +
    508A  TRP*     1.3    67.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 508 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7A  LEU*     3.8    19.9    -      -       +      +
     79A  ARG*     4.4     0.2    -      -       -      -
    327A  GLY      5.2     2.0    -      -       -      -
    328A  VAL*     4.1    20.2    -      -       +      +
    331A  GLY*     6.2     0.7    -      -       -      -
    332A  ASN*     2.9    31.5    -      -       -      +
    363A  ASN*     3.8    13.5    -      -       +      -
    368A  THR*     4.2     0.3    -      -       -      +
    376A  TYR*     2.5    36.2    +      +       +      -
    377A  SER      3.5    12.0    +      -       -      -
    378A  THR*     3.5    35.9    -      -       +      -
    379A  GLY*     3.6    18.6    -      -       -      -
    380A  PRO*     4.4     4.5    -      -       +      -
    504A  GLN*     3.0    51.0    +      -       +      +
    507A  ILE*     1.3    78.1    -      -       +      +
    509A  ASP*     1.3    66.1    +      -       -      +
    510A  ILE*     3.3    27.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 509 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4A  LYS*     3.7    41.8    +      -       +      +
      5A  VAL      5.5     0.2    -      -       -      +
     79A  ARG*     3.8    16.2    -      -       -      +
     96A  PHE*     5.8     0.3    -      -       -      -
    368A  THR*     3.1    14.5    +      -       +      -
    369A  ARG*     3.0    49.6    +      -       -      +
    370A  SER*     4.6     2.9    +      -       -      -
    376A  TYR*     4.6     1.6    -      -       -      +
    505A  GLY      3.0     8.0    +      -       -      -
    506A  VAL*     3.0    10.2    +      -       -      +
    507A  ILE      3.2     0.2    -      -       -      -
    508A  TRP*     1.3    78.9    -      -       -      +
    510A  ILE*     1.3    60.3    +      -       -      +
----------------------------------------------------------
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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