Contacts of the helix formed by residues 236 - 258 (chain C) in PDB entry 3OX4


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with ASP 236 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    229C  THR*     3.0    17.3    -      -       +      +
    233C  ASN*     2.8    32.0    +      -       +      +
    234C  GLY      3.4     0.2    -      -       -      -
    235C  LYS*     1.3    72.2    -      -       -      +
    237C  MET*     1.3    63.5    +      -       -      +
    238C  PRO*     3.6    17.9    -      -       -      +
    239C  ALA*     2.9    40.1    +      -       +      +
    240C  ARG*     3.1    14.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 237 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16C  GLU*     3.0    36.8    -      -       +      +
    177C  PRO*     3.5    23.8    -      -       +      +
    178C  LEU*     3.4    27.8    -      -       +      -
    181C  VAL*     3.5    29.2    -      -       -      -
    235C  LYS      2.8    13.1    +      -       -      +
    236C  ASP*     1.3    67.7    -      -       -      +
    238C  PRO*     1.3    76.1    -      -       +      +
    240C  ARG*     3.0     5.1    +      -       -      +
    241C  GLU*     2.8    27.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 238 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    226C  ASN*     4.9     1.3    -      -       -      -
    236C  ASP*     3.5    19.1    -      -       -      +
    237C  MET*     1.3    94.1    -      -       +      +
    239C  ALA*     1.3    56.1    +      -       -      +
    241C  GLU*     4.0     4.6    -      -       +      +
    242C  ALA*     3.0    29.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 239 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    226C  ASN*     4.0    18.6    -      -       -      +
    229C  THR*     3.7    16.8    -      -       +      -
    230C  ALA*     3.9    20.4    -      -       +      +
    236C  ASP*     2.9    27.3    +      -       -      +
    238C  PRO*     1.3    77.5    -      -       -      +
    240C  ARG*     1.3    59.7    +      -       -      +
    242C  ALA*     3.3     1.9    +      -       -      +
    243C  MET*     2.9    34.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 240 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177C  PRO*     4.0    17.8    -      -       +      +
    180C  MET*     3.3    27.0    +      -       +      +
    181C  VAL*     3.4    21.3    +      -       +      +
    183C  MET*     2.8    44.8    +      -       -      +
    188C  THR*     2.9    29.8    -      -       -      +
    230C  ALA*     4.1    14.9    +      -       +      +
    233C  ASN      5.3     0.4    -      -       -      +
    234C  GLY*     2.8    44.7    +      -       -      +
    236C  ASP      3.1    15.8    +      -       -      +
    237C  MET*     3.0    12.0    +      -       -      +
    239C  ALA*     1.3    76.8    -      -       +      +
    241C  GLU*     1.3    57.5    +      -       -      +
    243C  MET*     3.4     5.8    +      -       -      +
    244C  ALA*     3.0    26.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 241 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15C  GLY*     3.7     8.0    -      -       -      -
     16C  GLU*     3.6    31.6    +      -       -      +
    177C  PRO*     3.7    21.0    -      -       +      +
    237C  MET*     2.8    19.7    +      -       +      +
    238C  PRO*     4.1     4.7    -      -       +      +
    240C  ARG*     1.3    71.7    -      -       -      +
    242C  ALA*     1.3    65.6    +      -       -      +
    244C  ALA*     3.0    13.4    +      -       +      +
    245C  TYR*     3.1    40.7    +      -       +      -
      2D  ALA      4.3    20.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 242 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    222C  MET*     3.5    20.5    -      -       +      +
    226C  ASN*     3.2    37.7    -      -       -      +
    238C  PRO      3.0    19.9    +      -       -      +
    239C  ALA      3.3     2.4    +      -       -      +
    241C  GLU*     1.3    78.4    -      -       -      +
    243C  MET*     1.3    56.5    +      -       -      +
    245C  TYR*     3.3     2.0    +      -       -      -
    246C  ALA*     2.9    28.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 243 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140C  ALA*     3.8    23.6    -      -       +      +
    188C  THR      5.3     0.2    -      -       -      +
    192C  GLY*     3.7    18.6    -      -       -      +
    195C  ALA*     5.4     1.6    -      -       +      -
    222C  MET      4.5     0.7    -      -       -      +
    223C  ILE*     4.0    33.0    -      -       +      -
    226C  ASN*     4.1     6.3    -      -       +      -
    227C  LEU*     3.6    44.9    -      -       +      -
    230C  ALA*     4.2    18.8    -      -       +      -
    239C  ALA      2.9    20.3    +      -       -      +
    240C  ARG*     3.8     6.7    -      -       -      +
    242C  ALA*     1.3    74.4    -      -       -      +
    244C  ALA*     1.3    65.9    +      -       -      +
    246C  ALA*     3.8     2.6    -      -       +      +
    247C  GLN*     2.9    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 244 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14C  MET*     4.5     4.6    -      -       +      +
     15C  GLY      6.0     0.7    -      -       -      +
    140C  ALA*     4.7     0.4    -      -       -      +
    175C  ASN*     4.5    15.2    -      -       +      +
    177C  PRO*     4.7     3.6    -      -       +      -
    180C  MET*     4.0    27.1    -      -       +      -
    240C  ARG      3.0    15.4    +      -       -      +
    241C  GLU*     3.0    16.1    +      -       +      +
    243C  MET*     1.3    75.8    -      -       -      +
    245C  TYR*     1.3    64.2    +      -       +      +
    247C  GLN*     3.0    30.4    +      -       -      +
    248C  PHE*     3.2     6.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 245 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14C  MET*     3.5    46.6    +      -       +      +
     15C  GLY*     4.8     2.1    +      -       -      -
    222C  MET*     3.9    14.6    -      -       +      -
    241C  GLU*     3.1    47.4    +      -       +      -
    242C  ALA*     3.7     5.8    -      -       -      +
    244C  ALA*     1.3    79.0    -      -       +      +
    246C  ALA*     1.3    58.2    +      -       -      +
    248C  PHE*     3.1     3.5    +      -       -      +
    249C  LEU*     2.8    35.1    +      -       +      +
      2D  ALA      4.2     8.3    +      -       -      -
      4D  SER*     2.7    29.8    +      -       -      -
    209D  THR*     4.2     9.3    -      -       -      +
    210D  PRO*     3.9    33.2    -      -       +      -
    211D  ILE*     3.8    13.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 246 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    219C  ALA*     3.5    12.3    -      -       -      +
    222C  MET*     3.7    28.9    -      -       +      -
    223C  ILE*     3.9    24.2    -      -       +      +
    242C  ALA      2.9    17.2    +      -       -      +
    243C  MET*     3.8     8.3    -      -       -      +
    245C  TYR*     1.3    77.4    -      -       -      +
    247C  GLN*     1.3    57.3    +      -       -      +
    249C  LEU*     3.2     4.2    +      -       -      -
    250C  ALA*     2.9    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 247 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137C  ASN*     3.5    12.4    +      -       -      +
    140C  ALA*     3.7    15.0    -      -       -      +
    141C  GLY*     3.6    25.8    +      -       -      +
    143C  ALA*     2.9    40.4    +      -       -      +
    145C  GLU*     2.9    15.3    +      -       -      -
    175C  ASN*     2.9    29.1    +      -       -      +
    195C  ALA*     4.1    15.0    -      -       +      +
    198C  HIS*     5.4     0.3    +      -       -      -
    243C  MET*     2.9    16.7    +      -       +      +
    244C  ALA*     3.0    19.9    +      -       -      +
    246C  ALA*     1.3    78.3    -      -       -      +
    248C  PHE*     1.3    67.8    +      -       -      +
    250C  ALA*     3.6     2.6    +      -       -      +
    251C  GLY      3.1    19.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 248 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8C  ILE*     4.1    13.2    -      -       +      -
     12C  ASN*     3.3    40.4    -      -       +      -
     14C  MET*     3.2    34.1    -      -       +      -
    143C  ALA*     4.6     2.7    -      -       -      -
    145C  GLU*     4.2     2.5    -      -       -      -
    146C  MET*     3.7    30.2    -      -       +      +
    173C  SER*     3.8     9.2    -      -       -      -
    175C  ASN*     3.7    13.2    -      -       -      -
    244C  ALA      3.7     3.6    -      -       -      +
    245C  TYR      3.1     5.3    +      -       -      +
    246C  ALA      3.1     0.6    -      -       -      -
    247C  GLN*     1.3    85.9    -      -       -      +
    249C  LEU*     1.3    60.0    +      -       -      +
    251C  GLY*     2.9     4.0    +      -       -      -
    252C  MET*     2.8    54.8    +      -       +      +
      6D  PHE*     4.8     3.8    -      +       -      -
    211D  ILE*     3.8    12.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 249 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    215C  CYS*     3.4    45.1    -      -       +      +
    218C  LYS*     3.5    29.8    -      -       +      -
    219C  ALA*     4.0     3.1    -      -       +      +
    222C  MET*     3.8    16.8    -      -       -      -
    245C  TYR      2.8    20.5    +      -       -      +
    246C  ALA*     3.6     5.4    -      -       -      +
    248C  PHE*     1.3    76.7    -      -       -      +
    250C  ALA*     1.3    61.1    +      -       -      +
    252C  MET*     3.2    26.2    +      -       -      -
    253C  ALA*     3.2     9.2    +      -       -      +
    210D  PRO*     4.4     4.5    -      -       +      +
    211D  ILE*     3.8    37.7    -      -       +      -
    214D  ALA*     4.9     3.1    -      -       +      -
    215D  CYS*     6.0     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 250 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    195C  ALA*     3.4    29.4    -      -       +      +
    198C  HIS*     3.9    10.8    -      -       +      +
    199C  ALA*     4.1     5.4    -      -       -      +
    219C  ALA*     3.6    14.7    -      -       +      +
    223C  ILE*     5.4     0.2    -      -       +      -
    246C  ALA      2.9    17.4    +      -       -      +
    247C  GLN*     3.8     7.2    -      -       -      +
    249C  LEU*     1.3    78.3    -      -       -      +
    251C  GLY*     1.3    57.0    +      -       -      +
    253C  ALA*     3.3     6.9    +      -       -      +
    254C  PHE*     3.0    32.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 251 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143C  ALA*     3.4    26.9    -      -       -      +
    146C  MET*     3.7     7.4    -      -       -      -
    247C  GLN      3.1     6.3    +      -       -      -
    248C  PHE      2.9     8.3    +      -       -      -
    250C  ALA*     1.3    74.8    -      -       -      +
    252C  MET*     1.3    63.7    +      -       -      +
    253C  ALA      3.0     2.0    -      -       -      -
    254C  PHE*     3.5     7.9    -      -       -      -
    255C  ASN*     3.0    31.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 252 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6C  PHE*     3.4    19.7    -      -       +      -
      8C  ILE*     4.2     9.0    -      -       +      -
    146C  MET*     3.7     9.8    -      -       +      +
    212C  THR*     4.0     0.9    -      -       -      +
    215C  CYS*     3.8    17.7    -      -       -      -
    248C  PHE*     2.8    45.4    +      -       +      +
    249C  LEU*     3.2    30.0    +      -       -      +
    251C  GLY*     1.3    74.8    -      -       -      +
    253C  ALA*     1.3    58.6    +      -       -      +
    256C  ASN*     3.0    24.7    +      -       -      +
      6D  PHE*     4.1    13.2    -      -       +      -
    211D  ILE*     4.0    16.6    -      -       +      -
    252D  MET*     3.4    33.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 253 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    198C  HIS      5.2     0.2    -      -       -      +
    199C  ALA*     5.4     0.2    -      -       -      -
    202C  ALA*     3.5    20.2    -      -       +      -
    212C  THR*     3.4    31.4    -      -       -      +
    215C  CYS*     4.2     0.6    -      -       +      +
    216C  ALA*     3.9    12.1    -      -       +      +
    249C  LEU      3.2    10.8    +      -       -      +
    250C  ALA*     3.5     8.1    -      -       -      +
    251C  GLY      3.0     1.4    -      -       -      -
    252C  MET*     1.3    77.3    -      -       -      +
    254C  PHE*     1.3    59.9    +      -       -      +
    256C  ASN      3.3     1.7    +      -       -      -
    257C  ALA*     2.8    30.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 254 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142C  THR      3.2    22.0    -      -       -      -
    143C  ALA*     4.0     0.2    -      -       +      -
    147C  THR*     4.0    19.7    -      -       +      -
    149C  PHE*     3.9    11.0    -      +       -      -
    198C  HIS*     3.1    36.8    -      +       -      +
    202C  ALA*     3.7     6.9    -      -       +      +
    250C  ALA      3.0    24.3    +      -       -      +
    251C  GLY*     3.5    19.5    -      -       -      -
    253C  ALA*     1.3    74.9    -      -       -      +
    255C  ASN*     1.3    62.1    +      -       -      +
    256C  ASN      3.0     2.7    -      -       -      -
    258C  SER*     2.8    36.9    +      -       -      +
    259C  LEU*     3.2    39.9    -      -       +      -
   1385C  NAD      4.2    28.0    -      +       -      -
----------------------------------------------------------
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Residues in contact with ASN 255 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7C  TYR*     2.8    41.4    +      -       -      +
    146C  MET*     3.7    15.8    +      -       -      +
    147C  THR*     3.2    22.4    -      -       +      +
    148C  ARG*     2.9    61.5    +      -       -      +
    149C  PHE*     3.5    11.9    -      -       -      -
    169C  THR*     5.5     0.2    +      -       -      -
    251C  GLY      3.0    19.9    +      -       -      +
    254C  PHE*     1.3    81.1    -      -       -      +
    256C  ASN*     1.3    61.8    +      -       -      +
    258C  SER      4.8     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 256 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5C  THR      3.6    11.9    -      -       -      +
      6C  PHE*     3.1    23.0    -      -       +      -
      7C  TYR*     2.5    60.9    +      -       -      +
    148C  ARG*     4.2     8.8    +      -       -      +
    207C  ALA*     4.5     7.0    -      -       -      +
    209C  THR*     5.8     2.0    -      -       +      +
    212C  THR*     3.8    18.2    -      -       +      -
    252C  MET*     3.0    21.4    +      -       -      +
    253C  ALA      3.3     1.4    +      -       -      -
    255C  ASN*     1.3    83.9    -      -       -      +
    257C  ALA*     1.3    59.6    +      -       -      +
    258C  SER*     3.3     1.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 257 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    202C  ALA*     3.7    21.8    -      -       -      +
    205C  SER*     2.5    26.6    +      -       -      -
    207C  ALA*     3.5    15.5    -      -       -      +
    208C  ALA*     3.9    12.1    -      -       -      +
    212C  THR*     3.7    22.0    -      -       +      +
    253C  ALA      2.8    19.2    +      -       -      +
    256C  ASN*     1.3    74.1    -      -       -      +
    258C  SER*     1.3    68.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 258 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148C  ARG*     6.0     0.9    -      -       -      +
    149C  PHE*     5.2    10.1    -      -       -      -
    201C  GLU      4.1     0.3    -      -       -      +
    202C  ALA*     3.7    12.5    -      -       -      -
    207C  ALA*     5.3     0.4    -      -       -      -
    254C  PHE*     2.8    30.7    +      -       -      +
    255C  ASN      4.5     0.4    -      -       -      -
    256C  ASN      3.3     1.6    -      -       -      -
    257C  ALA*     1.3    87.8    -      -       -      +
    259C  LEU*     1.3    70.2    +      -       -      +
    361C  ALA      4.7     3.8    +      -       -      -
    362C  CYS*     4.6    11.3    -      -       -      +
    365C  THR*     3.5    20.4    +      -       -      +
----------------------------------------------------------
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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