Contacts of the helix formed by residues 522 - 546 (chain C) in PDB entry 5VOT


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 ALA 522 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    518C  LEU      4.7     6.4    +      -       -      -
    519C  ASP      5.3     1.1    -      -       -      -
    521C  LEU*     1.3    80.9    -      -       -      +
    523C  TYR*     1.3    60.5    +      -       -      +
    524C  GLU*     3.1    31.2    -      -       -      +
    525C  ILE*     3.5    18.3    -      -       +      +
    526C  TRP*     2.8    27.6    +      -       -      -
    788D  SER      4.5     0.4    -      -       -      +
    789D  LEU*     4.9     5.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 523 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    518C  LEU*     6.1     5.4    -      -       +      -
    522C  ALA*     1.3    70.4    -      -       -      +
    524C  GLU*     1.3    91.4    +      -       +      +
    525C  ILE      3.1     1.6    -      -       -      -
    526C  TRP*     2.8    28.2    +      -       -      +
    527C  MET*     2.9    41.2    +      -       +      +
    174H  TYR*     5.2     6.9    +      +       -      -
    175H  SER*     5.4     2.9    -      -       -      -
    176H  TYR*     3.3    28.7    +      +       -      -
    181H  TYR*     4.1    11.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 524 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    522C  ALA*     3.1    22.7    -      -       +      +
    523C  TYR*     1.3    96.3    +      -       +      +
    525C  ILE*     1.3    66.6    +      -       +      +
    527C  MET*     3.1    24.5    +      -       +      +
    528C  CYS*     2.9    28.4    +      -       -      -
    789D  LEU*     5.3     6.0    -      -       -      +
    157H  ILE*     4.5    19.1    -      -       +      -
    174H  TYR*     5.3     7.7    +      -       -      -
    176H  TYR*     3.7    29.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 525 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    521C  LEU*     3.7    22.9    -      -       +      -
    522C  ALA*     3.5    24.7    +      -       +      +
    523C  TYR      3.1     0.4    -      -       -      -
    524C  GLU*     1.3    80.6    -      -       +      +
    526C  TRP*     1.3    62.8    +      -       +      +
    528C  CYS*     3.0    11.3    +      -       +      +
    529C  ILE*     2.9    43.0    +      -       +      +
    612C  ILE*     4.8     6.3    -      -       +      -
    788D  SER*     3.1    28.0    -      -       -      +
    789D  LEU*     3.2    25.6    -      -       -      +
    792D  VAL*     5.5    11.7    -      -       +      -
    796D  PHE*     5.9     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 526 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    607B  PHE*     5.1    16.4    -      +       -      -
    610B  LEU*     6.2     3.6    -      -       +      -
    517C  PHE*     5.4     2.7    -      +       -      -
    518C  LEU*     3.3    52.5    +      -       +      +
    520C  PRO*     6.1     0.2    -      -       -      +
    521C  LEU*     4.8    15.3    -      -       +      +
    522C  ALA      2.8    28.1    +      -       -      -
    523C  TYR*     2.8    15.3    +      -       -      +
    525C  ILE*     1.3    74.3    -      -       +      +
    527C  MET*     1.3    57.6    +      -       +      +
    529C  ILE*     3.0    30.4    +      -       +      +
    530C  VAL*     2.9    34.9    +      -       +      +
    584C  PHE*     4.5    22.2    -      +       -      -
    613C  ILE*     5.9     4.0    -      -       +      -
    616C  TYR*     4.5    27.6    -      +       +      -
----------------------------------------------------------
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Residues in contact with MET 527 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    523C  TYR*     2.9    48.3    +      -       +      +
    524C  GLU*     3.1    18.1    +      -       +      +
    526C  TRP*     1.3    75.8    -      -       +      +
    528C  CYS*     1.3    57.2    +      -       -      +
    530C  VAL*     3.2    10.6    +      -       +      +
    531C  PHE*     2.9    51.1    +      -       +      -
    157H  ILE*     6.4     0.4    -      -       +      -
    176H  TYR*     5.3     1.1    -      -       +      -
    180H  PHE*     5.1     8.3    -      -       +      -
    181H  TYR*     4.3    27.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 528 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    524C  GLU      2.9    18.7    +      -       -      -
    525C  ILE*     3.0    10.3    +      -       -      +
    527C  MET*     1.3    76.1    -      -       -      +
    529C  ILE*     1.3    57.8    +      -       -      +
    531C  PHE*     3.0    22.0    +      -       +      +
    532C  ALA*     2.9    30.5    +      -       -      +
    796D  PHE*     3.8    24.0    -      -       +      -
    150H  ILE*     5.4     0.5    -      -       -      +
    153H  ILE*     5.3     1.6    -      -       -      -
    154H  ILE*     4.7    20.2    -      -       +      -
    157H  ILE*     4.2    24.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 529 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    521C  LEU*     5.2     2.0    -      -       +      -
    525C  ILE*     2.9    37.2    +      -       +      +
    526C  TRP*     3.0    39.2    +      -       +      +
    528C  CYS*     1.3    76.9    -      -       -      +
    530C  VAL*     1.3    59.4    +      -       +      +
    532C  ALA*     3.9     5.1    -      -       -      +
    533C  TYR*     2.9    31.5    +      -       +      +
    584C  PHE*     4.1    28.5    -      -       +      -
    605C  TRP*     5.0     2.5    -      -       +      -
    608C  PHE*     4.5    20.2    -      -       +      -
    612C  ILE*     4.2    18.8    -      -       +      -
    796D  PHE*     4.8     6.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 530 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    526C  TRP*     2.9    22.3    +      -       +      +
    527C  MET*     3.2    11.0    +      -       -      +
    529C  ILE*     1.3    77.8    -      -       +      +
    531C  PHE*     1.3    69.2    +      -       +      +
    533C  TYR*     3.1    11.3    +      -       +      +
    534C  ILE*     2.9    38.8    +      -       +      +
    188H  ILE*     6.1     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 531 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    527C  MET*     2.9    40.1    +      -       +      -
    528C  CYS*     3.0    24.7    +      -       -      +
    530C  VAL*     1.3    83.5    -      -       +      +
    532C  ALA*     1.3    64.3    +      -       -      +
    534C  ILE*     3.2    10.7    -      -       +      +
    535C  GLY*     2.9    20.8    +      -       -      -
    150H  ILE*     3.6    42.8    -      -       +      +
    153H  ILE*     4.7    17.3    -      -       +      -
    157H  ILE*     6.0     0.7    -      -       +      -
    180H  PHE*     5.8     3.6    -      +       -      -
    184H  ALA*     3.5    33.0    -      -       +      -
    187H  PHE*     6.5     0.4    -      -       +      -
    188H  ILE*     4.2    24.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 532 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    528C  CYS      2.9    16.6    +      -       -      +
    529C  ILE*     4.2     5.2    -      -       -      +
    531C  PHE*     1.3    73.2    -      -       -      +
    533C  TYR*     1.3    57.2    +      -       -      +
    535C  GLY*     4.5     1.6    -      -       -      +
    536C  VAL*     2.9    40.4    +      -       +      +
    605C  TRP*     4.5    14.8    -      -       +      -
    608C  PHE*     5.5     2.2    -      -       +      -
    796D  PHE*     5.1    10.5    -      -       +      -
    800D  VAL*     4.9    22.7    -      -       +      -
    803D  LEU*     5.7     0.2    -      -       +      -
    150H  ILE*     4.8     5.4    -      -       +      +
    154H  ILE*     6.4     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 533 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    529C  ILE*     2.9    23.0    +      -       +      +
    530C  VAL*     3.1    12.8    -      -       +      +
    531C  PHE      3.0     0.2    -      -       -      -
    532C  ALA*     1.3    77.4    -      -       -      +
    534C  ILE*     1.3    77.4    +      -       +      +
    536C  VAL*     3.9     1.6    -      -       -      +
    537C  SER*     3.0    25.5    +      -       -      -
    577C  LEU*     3.4    34.5    +      -       +      +
    580C  SER*     3.1    27.2    +      -       -      -
    581C  LEU*     3.2    46.0    +      -       +      +
    584C  PHE*     5.0     7.2    -      +       +      -
    605C  TRP*     4.3    17.5    -      +       +      -
----------------------------------------------------------
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Residues in contact with ILE 534 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    530C  VAL*     2.9    25.0    +      -       +      +
    531C  PHE*     3.2    18.2    -      -       +      +
    533C  TYR*     1.3    87.1    -      -       +      +
    535C  GLY*     1.3    77.3    +      -       -      +
    537C  SER*     3.6     5.9    -      -       -      -
    538C  VAL*     2.9    33.5    +      -       +      +
    577C  LEU*     5.3     5.2    -      -       +      -
    150H  ILE*     4.2     9.9    -      -       +      -
    188H  ILE*     5.1    18.6    -      -       +      -
    191H  GLU*     3.9    29.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 535 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    531C  PHE      2.9    15.9    +      -       -      -
    532C  ALA*     3.9     2.0    -      -       -      -
    534C  ILE*     1.3    83.4    -      -       -      +
    536C  VAL*     1.3    63.4    +      -       -      +
    538C  VAL*     3.1     6.3    +      -       -      +
    539C  VAL*     2.9    30.5    +      -       -      +
    147H  LEU*     4.5    18.2    -      -       -      -
    150H  ILE*     5.3     2.0    -      -       -      -
    191H  GLU*     4.8     6.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 536 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    532C  ALA*     2.9    27.1    +      -       +      +
    533C  TYR*     3.9     2.2    -      -       -      +
    535C  GLY*     1.3    71.3    -      -       -      +
    537C  SER*     1.3    63.5    +      -       -      +
    539C  VAL*     3.3     6.0    +      -       -      +
    540C  LEU*     2.9    41.1    +      -       +      +
    580C  SER*     5.1     3.8    -      -       -      +
    601C  VAL*     4.2    14.1    -      -       +      +
    605C  TRP*     4.0    38.8    -      -       +      -
    803D  LEU*     3.5    35.2    -      -       +      -
    147H  LEU*     5.4     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 537 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    533C  TYR      3.0    17.9    +      -       -      -
    534C  ILE*     3.6     5.6    -      -       -      -
    536C  VAL*     1.3    78.6    -      -       -      +
    538C  VAL*     1.3    65.5    +      -       -      +
    540C  LEU*     3.2     9.4    +      -       -      +
    541C  PHE*     3.0    21.1    +      -       -      +
    573C  ILE*     4.6     5.6    -      -       -      +
    576C  SER*     4.6     5.0    -      -       -      -
    577C  LEU*     3.3    35.5    -      -       -      +
    580C  SER*     3.2    24.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 538 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    534C  ILE*     2.9    26.1    +      -       +      +
    535C  GLY      3.6     3.6    -      -       -      +
    537C  SER*     1.3    75.4    -      -       -      +
    539C  VAL*     1.3    65.8    +      -       -      +
    541C  PHE*     2.8    22.2    +      -       +      +
    542C  LEU*     2.9    13.2    +      -       +      +
    573C  ILE*     4.5     6.3    -      -       +      -
    143H  VAL*     3.9    30.7    -      -       +      -
    191H  GLU*     4.3    18.4    -      -       +      +
    192H  MET*     6.2     1.8    -      -       -      -
    194H  GLY      5.6     0.2    -      -       -      -
    195H  VAL*     3.9    33.2    -      -       +      +
    198H  VAL*     6.2     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 539 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    535C  GLY      2.9    22.8    +      -       -      +
    536C  VAL*     3.8     6.1    -      -       -      +
    538C  VAL*     1.3    75.6    -      -       -      +
    540C  LEU*     1.3    63.9    +      -       +      +
    542C  LEU*     2.9    17.0    +      -       +      +
    543C  VAL*     2.9    23.4    +      -       +      +
    601C  VAL*     5.2    11.7    -      -       +      -
    803D  LEU*     5.2    10.3    -      -       +      +
    804D  GLY*     5.5     2.2    -      -       -      +
    807D  MET*     4.2    24.7    -      -       +      -
    143H  VAL*     4.4    15.0    -      -       +      -
    147H  LEU*     4.0    28.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 540 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    536C  VAL*     2.9    33.5    +      -       +      +
    537C  SER*     3.4    10.3    -      -       -      +
    539C  VAL*     1.3    74.5    -      -       -      +
    541C  PHE*     1.3    64.0    +      -       -      +
    543C  VAL*     2.9    18.9    +      -       +      +
    544C  SER*     2.9    11.6    +      -       -      -
    570C  GLU*     5.6     2.4    -      -       +      +
    576C  SER*     5.1    12.6    -      -       -      +
    579C  PHE*     4.6    24.9    -      -       +      -
    580C  SER*     5.6     3.6    -      -       -      -
    593C  PRO*     5.8     4.9    -      -       +      -
    598C  GLY*     4.0    23.1    -      -       -      +
    601C  VAL*     3.6    34.5    -      -       +      -
    602C  GLY*     4.3     5.2    -      -       -      +
    605C  TRP*     6.1     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 541 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    537C  SER      3.0     7.2    +      -       -      +
    538C  VAL*     2.8    17.2    +      -       +      +
    540C  LEU*     1.3    72.3    -      -       -      +
    542C  LEU*     1.3    58.2    +      -       -      +
    544C  SER*     2.8    18.7    +      -       -      +
    545C  ARG*     2.9    34.5    +      -       +      +
    570C  GLU      3.8     8.1    -      -       -      -
    571C  PHE      3.4    18.6    -      -       -      -
    572C  GLY*     3.3     9.0    -      -       -      -
    573C  ILE*     3.1    63.7    -      -       +      -
    576C  SER*     4.3     7.7    +      -       -      +
    195H  VAL*     5.1     9.9    -      -       +      -
    198H  VAL*     4.3    22.7    -      -       +      -
    199H  HIS*     5.0    21.3    -      +       +      -
    202H  ILE*     5.9     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 542 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    538C  VAL*     2.9    11.6    +      -       +      +
    539C  VAL*     2.9    17.2    +      -       +      +
    541C  PHE*     1.3    78.8    -      -       -      +
    543C  VAL*     1.3    63.4    +      -       +      +
    544C  SER      3.3     0.5    +      -       -      -
    545C  ARG*     4.6     2.2    -      -       +      +
    546C  PHE*     3.3    41.4    +      -       +      +
    807D  MET*     5.8     2.9    -      -       +      -
    811D  LEU*     4.4    22.2    -      -       +      +
    136H  LEU*     5.5     3.4    -      -       +      -
    140H  ILE*     4.1    32.3    -      -       +      -
    143H  VAL*     5.9     7.4    -      -       +      -
    198H  VAL*     3.8    33.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 543 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    539C  VAL*     2.9    23.5    +      -       +      +
    540C  LEU*     2.9    21.6    +      -       +      +
    542C  LEU*     1.3    75.7    -      -       +      +
    544C  SER*     1.3    62.0    +      -       -      +
    546C  PHE*     4.6     4.9    -      -       -      +
    547C  SER*     5.0     1.2    +      -       -      -
    595C  SER*     3.2    21.1    +      -       -      +
    597C  SER*     3.0    35.7    -      -       -      +
    598C  GLY*     3.6    11.9    -      -       -      +
    601C  VAL*     5.0     5.2    -      -       +      -
    807D  MET*     5.3     8.7    -      -       +      -
    811D  LEU*     6.2     3.6    -      -       +      -
    814D  PHE*     4.7    17.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 544 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    540C  LEU      2.9     8.0    +      -       -      -
    541C  PHE*     2.8    13.7    +      -       -      -
    543C  VAL*     1.3    81.5    -      -       -      +
    545C  ARG*     1.3    64.4    +      -       -      -
    546C  PHE      3.3     7.3    -      -       -      +
    568C  THR*     3.8    14.1    +      -       -      +
    570C  GLU*     2.8    49.3    +      -       -      +
    571C  PHE*     3.3    12.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 545 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    541C  PHE*     2.9    40.3    +      -       +      +
    542C  LEU*     4.9     3.4    -      -       +      +
    544C  SER*     1.3    71.7    -      -       -      +
    546C  PHE*     1.3    67.9    +      -       -      +
    547C  SER      4.7     1.4    -      -       -      -
    548C  PRO*     4.8     4.5    -      -       -      +
    571C  PHE*     5.2    15.8    -      -       +      +
    198H  VAL*     5.5     4.5    -      -       +      +
    202H  ILE*     3.4    36.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 546 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    542C  LEU*     3.3    31.9    +      -       +      +
    543C  VAL      4.6     2.0    -      -       -      +
    544C  SER      3.3     9.4    -      -       -      +
    545C  ARG*     1.3    84.3    -      -       -      +
    547C  SER*     1.3    98.4    +      -       -      +
    548C  PRO*     3.7     2.9    -      -       +      -
    811D  LEU*     4.4    17.5    -      -       +      -
    814D  PHE*     3.4    39.9    -      +       +      -
    815D  CYS*     4.7    10.8    -      -       +      -
    136H  LEU*     3.5    46.2    -      -       +      -
    140H  ILE*     5.6     8.3    -      -       +      -
    202H  ILE*     4.7     5.4    -      -       +      -
    205H  HIS*     5.3     3.4    -      +       -      -
----------------------------------------------------------
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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