Contacts of the helix formed by residues 431 - 455 (chain C) in PDB entry 5YD6


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with PRO 431 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    429C  ASP      3.9     0.2    -      -       -      -
    430C  LEU*     1.4    87.1    -      -       +      +
    432C  LYS*     1.3    55.7    +      -       -      +
    433C  ALA*     3.2     2.5    -      -       +      +
    434C  ASP*     2.9    33.8    +      -       -      +
    435C  GLN*     2.8    31.9    +      -       -      +
    519C  LYS*     4.5    16.8    -      -       +      -
    520C  GLU*     3.8    33.9    -      -       +      +
    523C  ARG*     4.0     5.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 432 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418C  ARG*     4.1    17.4    -      -       -      +
    422C  GLU*     5.7     0.8    +      -       -      -
    430C  LEU      3.5     2.0    +      -       -      -
    431C  PRO*     1.3    71.1    -      -       -      +
    433C  ALA*     1.3    56.9    +      -       -      +
    435C  GLN*     3.5    21.3    +      -       -      +
    436C  ASP*     2.7    70.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 433 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    431C  PRO*     3.2     1.4    -      -       +      +
    432C  LYS*     1.3    78.4    -      -       -      +
    434C  ASP*     1.3    58.5    +      -       -      +
    436C  ASP*     3.5     7.5    +      -       -      +
    437C  LEU*     3.0    28.6    +      -       -      +
    519C  LYS*     3.9    35.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 434 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    430C  LEU*     4.6     5.6    -      -       +      -
    431C  PRO*     2.9    25.7    +      -       +      +
    433C  ALA*     1.3    76.2    -      -       -      +
    435C  GLN*     1.3    59.3    +      -       -      +
    437C  LEU*     3.7     3.0    -      -       -      +
    438C  LEU*     2.8    41.0    +      -       +      +
    517C  GLY      4.2     1.7    -      -       -      +
    518C  LEU*     3.4    24.4    -      -       +      +
    519C  LYS*     2.6    34.4    +      -       -      +
    520C  GLU*     2.9    30.5    +      -       -      +
    524C  VAL*     4.8     2.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 435 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    422C  GLU*     4.4    16.2    +      -       -      +
    427C  PHE*     3.3    57.5    -      -       +      +
    428C  ALA*     3.0    20.0    -      -       -      +
    430C  LEU*     3.0    21.7    -      -       +      +
    431C  PRO      2.8    15.1    +      -       -      +
    432C  LYS*     3.6    24.5    -      -       +      +
    434C  ASP*     1.3    71.5    -      -       -      +
    436C  ASP*     1.3    62.1    +      -       -      +
    438C  LEU*     4.8     0.4    -      -       -      +
    439C  PHE*     3.0    31.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 436 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418C  ARG*     4.7     7.4    +      -       -      -
    432C  LYS*     2.7    55.3    +      -       -      +
    433C  ALA*     3.8     6.5    -      -       -      +
    435C  GLN*     1.3    75.7    -      -       -      +
    437C  LEU*     1.3    58.3    +      -       -      +
    439C  PHE*     3.5     5.5    +      -       -      +
    440C  GLU*     3.0    50.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 437 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    433C  ALA      3.0    17.7    +      -       -      +
    434C  ASP*     3.3     5.1    +      -       -      +
    436C  ASP*     1.3    73.4    -      -       -      +
    438C  LEU*     1.3    59.2    +      -       -      +
    440C  GLU*     4.3     3.3    -      -       +      +
    441C  SER*     2.7    48.1    +      -       -      +
    515C  ARG*     4.2    14.6    -      -       +      -
    516C  HIS      3.4    26.0    -      -       -      +
    517C  GLY*     3.7    24.5    -      -       -      +
    518C  LEU*     3.8     9.2    -      -       +      +
    594C  ASP*     5.2    10.1    -      -       +      +
    595C  THR*     5.8     3.6    -      -       -      +
    601C  8SU      5.9     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 438 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    427C  PHE*     3.7    26.5    -      -       +      -
    430C  LEU*     3.7    22.0    -      -       +      -
    434C  ASP      2.8    25.1    +      -       -      +
    435C  GLN      3.9     2.9    -      -       -      +
    437C  LEU*     1.3    72.3    -      -       -      +
    439C  PHE*     1.3    64.9    +      -       -      +
    441C  SER*     4.0     3.1    -      -       -      -
    442C  ALA*     3.3    16.1    +      -       -      +
    511C  MET*     3.4    36.8    -      -       +      +
    512C  VAL*     5.1     4.9    -      -       +      -
    513C  THR      3.4    21.3    -      -       -      +
    515C  ARG*     4.1    11.6    +      -       +      -
    518C  LEU*     4.1    12.8    -      -       +      -
    524C  VAL*     4.2    16.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 439 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    414C  MET*     3.6    28.7    -      -       +      -
    417C  ILE*     4.0    18.2    -      -       +      -
    418C  ARG*     3.6    57.0    -      -       +      -
    421C  ALA*     5.2     2.2    -      -       +      -
    427C  PHE*     4.9     4.0    -      -       +      -
    435C  GLN      3.0    19.6    +      -       -      +
    436C  ASP*     3.9     5.4    -      -       -      +
    438C  LEU*     1.3    77.3    -      -       -      +
    440C  GLU*     1.3    77.4    +      -       +      +
    442C  ALA*     3.2     2.6    +      -       -      +
    443C  PHE*     2.8    46.8    +      +       +      -
    511C  MET*     3.9    16.6    -      -       -      +
    591C  LEU*     4.0    20.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 440 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    436C  ASP*     3.0    35.4    +      -       -      +
    437C  LEU*     4.3     3.6    -      -       +      +
    439C  PHE*     1.3    86.2    -      -       +      +
    441C  SER*     1.3    59.8    +      -       -      +
    442C  ALA      3.4     0.3    +      -       -      -
    443C  PHE*     3.5     0.5    +      -       -      +
    590C  LYS*     5.0     5.0    -      -       -      -
    591C  LEU*     3.5    42.5    -      -       +      +
    594C  ASP*     2.6    40.3    -      -       +      +
    595C  THR*     3.7    13.8    +      -       -      +
    601C  8SU      2.8    30.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 441 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    437C  LEU*     2.7    36.3    +      -       -      +
    438C  LEU      4.0     1.8    -      -       -      -
    440C  GLU*     1.3    78.5    -      -       -      +
    442C  ALA*     1.3    55.8    +      -       -      +
    443C  PHE      3.5     0.2    -      -       -      -
    445C  GLU*     4.3     2.1    -      -       -      +
    515C  ARG*     3.3    42.4    +      -       -      +
    595C  THR*     4.0    11.5    +      -       -      +
    601C  8SU      3.4    39.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 442 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    438C  LEU      3.3    14.8    +      -       -      +
    439C  PHE      3.2     2.3    +      -       -      +
    441C  SER*     1.3    76.9    -      -       -      +
    443C  PHE*     1.3    67.1    +      -       -      +
    444C  LEU      3.4     2.5    -      -       -      -
    445C  GLU*     3.1    10.5    +      -       +      +
    446C  LEU*     2.8    37.0    +      -       +      +
    510C  ALA      3.5    25.1    -      -       -      +
    511C  MET*     3.8     9.0    -      -       +      -
    515C  ARG*     3.8     7.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 443 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    410C  LEU*     3.3    33.2    -      -       +      -
    413C  SER*     4.1     1.8    -      -       -      -
    414C  MET*     3.4    28.0    -      -       +      -
    417C  ILE*     3.7    27.8    -      -       +      -
    439C  PHE*     2.8    32.8    +      +       +      +
    440C  GLU      3.9     3.1    -      -       -      +
    441C  SER      3.5     2.0    -      -       -      -
    442C  ALA*     1.3    74.9    -      -       -      +
    444C  LEU*     1.3    72.2    +      -       +      +
    446C  LEU*     3.0     6.2    +      -       -      +
    447C  PHE*     2.7    42.1    +      -       +      -
    591C  LEU*     4.1    17.9    -      -       +      -
    601C  8SU      3.4    40.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 444 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    410C  LEU*     3.8    29.4    -      -       +      -
    442C  ALA      3.4     0.2    -      -       -      -
    443C  PHE*     1.3    81.3    -      -       +      +
    445C  GLU*     1.3    56.7    +      -       -      +
    447C  PHE*     3.6     3.8    -      -       +      +
    448C  VAL*     2.9    35.3    +      -       -      +
    482C  TRP*     3.9    18.4    -      -       +      -
    566C  CYS*     3.7    20.6    -      -       -      +
    569C  GLY*     3.8    11.0    -      -       -      -
    570C  LEU*     3.7    29.6    -      -       -      +
    573C  ILE*     4.4     9.2    -      -       +      -
    601C  8SU      3.1    41.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 445 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    441C  SER      4.3     3.1    -      -       -      +
    442C  ALA*     3.1    13.3    +      -       +      +
    444C  LEU*     1.3    78.3    -      -       -      +
    446C  LEU*     1.3    57.1    +      -       -      +
    448C  VAL*     3.4     0.8    +      -       -      -
    449C  LEU*     2.9    30.8    +      -       -      +
    510C  ALA*     4.8    11.3    -      -       +      +
    515C  ARG*     3.9    12.9    +      -       -      -
    559C  LEU*     4.0     6.1    -      -       -      +
    562C  LEU*     3.3    34.2    -      -       +      +
    563C  ARG*     2.8    56.6    +      -       -      +
    566C  CYS*     3.6    21.7    -      -       +      -
    601C  8SU      4.2     7.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 446 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    417C  ILE*     4.1    17.9    -      -       +      -
    420C  TRP*     3.8    17.9    -      -       +      -
    442C  ALA*     2.8    43.7    +      -       +      +
    443C  PHE      3.6     3.4    -      -       -      +
    445C  GLU*     1.3    69.9    -      -       -      +
    447C  PHE*     1.3    67.1    +      -       -      +
    449C  LEU*     4.1     9.0    -      -       +      -
    450C  ARG*     3.0    43.9    +      -       -      +
    507C  ALA*     3.4    41.5    -      -       +      +
    510C  ALA*     3.8    15.7    -      -       +      -
    511C  MET*     3.9    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 447 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    409C  LEU*     3.7    22.4    -      -       +      -
    410C  LEU*     3.7    30.3    -      -       +      -
    413C  SER*     3.6    20.9    -      -       -      -
    417C  ILE*     3.9     7.9    -      -       +      +
    443C  PHE*     2.7    31.3    +      +       +      +
    444C  LEU*     3.6    11.2    -      -       +      +
    446C  LEU*     1.3    72.8    -      -       -      +
    448C  VAL*     1.3    71.5    +      -       +      +
    450C  ARG*     4.2     2.0    -      -       -      +
    451C  LEU*     3.2    39.7    +      -       +      +
    454C  ARG*     5.3     3.1    +      -       -      -
    464C  PHE*     3.8    33.0    -      +       -      -
    465C  CYS      6.3     0.4    -      -       -      -
    479C  PHE*     4.1    16.2    -      +       -      -
    482C  TRP*     4.7     6.1    -      +       -      -
    486C  ILE*     5.3     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 448 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    444C  LEU      2.9    20.3    +      -       -      +
    445C  GLU*     3.8     2.7    -      -       -      +
    447C  PHE*     1.3    78.0    -      -       +      +
    449C  LEU*     1.3    62.5    +      -       -      +
    451C  LEU*     3.4     7.6    +      -       -      +
    452C  ALA*     2.9    28.1    +      -       -      +
    482C  TRP*     3.3    38.4    -      -       +      +
    486C  ILE*     4.1    17.4    -      -       +      +
    489C  PHE*     4.5     4.7    -      -       +      -
    562C  LEU*     3.7    13.2    -      -       +      +
    565C  LEU*     3.3    35.7    -      -       +      +
    566C  CYS*     5.6     1.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 449 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    445C  GLU      2.9    20.9    +      -       -      +
    446C  LEU*     3.9    10.3    -      -       +      +
    448C  VAL*     1.3    74.5    -      -       -      +
    450C  ARG*     1.3    56.0    +      -       -      +
    452C  ALA*     3.2     7.3    +      -       -      +
    453C  TYR*     3.1    27.7    +      -       -      +
    489C  PHE*     4.0    23.6    -      -       +      -
    493C  LEU*     4.0    12.7    -      -       +      +
    503C  PHE*     3.6    20.0    -      -       +      -
    506C  ILE*     4.4    14.8    -      -       +      +
    507C  ALA*     3.7    37.5    -      -       +      +
    510C  ALA*     4.4     1.3    -      -       +      -
    558C  LYS*     6.0     1.3    -      -       +      -
    562C  LEU*     3.8    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 450 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    372C  HIS*     4.5     4.7    -      -       +      -
    375C  SER*     2.9    44.6    +      -       -      -
    376C  ASN*     3.4    22.1    +      -       -      +
    416C  ILE*     3.3    19.8    -      -       -      +
    417C  ILE*     3.6    23.3    -      -       -      +
    420C  TRP*     4.1    18.4    -      -       -      +
    446C  LEU*     3.0    42.2    +      -       +      +
    447C  PHE*     4.4     2.0    -      -       -      +
    449C  LEU*     1.3    74.2    -      -       -      +
    451C  LEU*     1.3    64.8    +      -       -      +
    453C  TYR*     3.4     2.3    +      -       -      +
    454C  ARG*     3.3    47.1    +      -       -      +
    465C  CYS*     4.6     4.4    -      -       -      +
    503C  PHE*     4.2    22.0    -      -       +      -
    507C  ALA*     5.2     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 451 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    447C  PHE*     3.2    36.6    +      -       +      +
    448C  VAL*     3.4     4.7    -      -       -      +
    450C  ARG*     1.3    75.2    -      -       -      +
    452C  ALA*     1.3    60.5    +      -       -      +
    454C  ARG*     3.4    12.5    +      -       -      +
    455C  SER*     2.6    45.0    +      -       -      +
    462C  LEU*     3.9    16.8    -      -       +      -
    463C  ILE      3.4    24.9    -      -       -      +
    464C  PHE*     3.8    35.4    -      -       +      -
    479C  PHE*     4.9     2.9    -      -       +      -
    483C  ILE*     5.7     0.4    -      -       +      -
    486C  ILE*     3.9    28.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 452 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    448C  VAL*     2.9    19.1    +      -       +      +
    449C  LEU      3.2     6.0    +      -       -      +
    451C  LEU*     1.3    77.9    -      -       -      +
    453C  TYR*     1.3    58.1    +      -       -      +
    455C  SER*     4.0     1.7    +      -       -      -
    462C  LEU*     6.1     0.4    -      -       -      -
    486C  ILE*     4.7     4.9    -      -       +      +
    489C  PHE*     3.7    30.1    -      -       +      -
    490C  SER*     2.5    42.5    +      -       -      +
    493C  LEU*     4.1     4.5    -      -       +      -
    494C  GLN*     3.1    12.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 453 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    370A  ARG*     5.0     3.8    +      -       -      -
    372C  HIS*     4.2    18.4    -      +       -      -
    449C  LEU      3.1     6.9    +      -       -      +
    450C  ARG      3.9     4.3    -      -       -      +
    451C  LEU      3.3     0.2    -      -       -      -
    452C  ALA*     1.3    78.0    -      -       -      +
    454C  ARG*     1.3    63.1    +      -       +      +
    455C  SER      4.3     0.2    -      -       -      +
    493C  LEU*     4.1    15.3    -      -       +      -
    494C  GLN*     3.7    20.5    -      -       +      +
    498C  ILE*     2.7    36.0    +      -       +      -
    499C  ASP*     3.3    16.5    -      -       -      -
    500C  ILE*     3.5    12.1    +      -       +      +
    503C  PHE*     3.5    65.1    -      +       +      -
----------------------------------------------------------
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Residues in contact with ARG 454 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    376C  ASN*     2.8    38.8    +      -       -      -
    377C  PRO*     3.6    17.9    -      -       -      -
    379C  MET*     3.6    33.4    -      -       +      +
    447C  PHE*     5.3     2.4    +      -       -      -
    450C  ARG*     3.3    36.1    +      -       -      +
    451C  LEU*     3.7    19.7    -      -       -      +
    453C  TYR*     1.3    81.6    -      -       +      +
    455C  SER*     1.3    64.2    +      -       -      +
    463C  ILE*     3.0    43.5    +      -       +      +
    464C  PHE*     3.3     4.9    +      -       -      +
    465C  CYS*     3.1    38.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 455 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    451C  LEU*     2.6    26.1    +      -       -      +
    452C  ALA*     4.0     0.6    +      -       -      -
    453C  TYR      3.5     0.7    -      -       -      +
    454C  ARG*     1.3    80.5    -      -       -      +
    456C  ASN*     1.3    56.4    +      -       -      +
    457C  PRO*     3.6     1.8    -      -       -      -
    461C  LYS      3.0    18.6    -      -       -      -
    462C  LEU*     3.3    12.0    -      -       -      +
    463C  ILE*     2.9    27.5    +      -       -      -
    490C  SER*     4.3    11.0    -      -       -      -
    494C  GLN*     2.7    29.5    +      -       -      +
----------------------------------------------------------
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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