Contacts of the helix formed by residues 182 - 209 (chain C) in PDB entry 3JRS


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 SER 182 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112B  SER*     3.9     5.9    +      -       -      -
    143C  ARG*     4.2     3.9    +      -       -      +
    177C  VAL*     4.4     0.4    -      -       -      -
    180C  GLY      3.9     0.6    +      -       -      -
    181C  ASN*     1.3    72.8    -      -       -      +
    183C  GLU*     1.3    53.5    +      -       -      +
    184C  GLU*     3.4    12.6    +      -       -      +
    185C  ASP*     2.9    43.3    +      -       -      +
    186C  THR*     2.6    37.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 183 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55C  GLY*     6.0     1.2    -      -       -      -
     56C  ARG      4.5     5.2    -      -       -      +
     57C  CYS*     3.3    20.0    -      -       +      +
    177C  VAL*     4.2    23.2    -      -       +      +
    181C  ASN      3.4     5.7    +      -       -      -
    182C  SER*     1.3    67.5    -      -       -      +
    184C  GLU*     1.3    63.1    +      -       -      +
    186C  THR*     3.2     4.8    +      -       -      -
    187C  ARG*     2.8    62.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 184 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182C  SER*     3.4    10.8    +      -       -      +
    183C  GLU*     1.3    79.1    -      -       -      +
    185C  ASP*     1.3    70.2    +      -       -      +
    187C  ARG*     3.9    10.4    -      -       -      +
    188C  LEU*     2.9    31.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 185 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90B  LYS*     5.0    12.0    +      -       -      +
    111B  ILE*     3.9    24.8    -      -       +      +
    112B  SER*     2.6    50.7    +      -       -      +
    143C  ARG*     4.2     4.9    -      -       -      +
    182C  SER*     2.9    28.9    +      -       -      +
    184C  GLU*     1.3    88.8    -      -       -      +
    186C  THR*     1.3    61.1    +      -       -      +
    188C  LEU*     3.8     6.4    -      -       -      +
    189C  PHE*     3.1    24.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 186 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57C  CYS*     5.4     1.8    -      -       -      -
    143C  ARG*     3.6    41.5    +      -       +      +
    144C  LEU*     4.0    18.6    -      -       +      +
    175C  VAL*     4.8    14.1    -      -       +      -
    177C  VAL*     4.6    14.8    -      -       +      +
    178C  PRO*     5.8     0.2    -      -       -      +
    181C  ASN*     4.6     2.9    +      -       -      +
    182C  SER      2.6    23.8    +      -       -      -
    183C  GLU*     3.6     6.0    -      -       -      -
    185C  ASP*     1.3    74.9    -      -       -      +
    187C  ARG*     1.3    64.5    +      -       -      +
    189C  PHE*     3.4     5.7    +      -       -      +
    190C  ALA*     3.1    22.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 187 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57C  CYS*     3.5    21.4    -      -       -      +
     58C  SER      3.1    28.9    +      -       -      +
     59C  SER*     4.2     6.3    +      -       -      -
    173C  TYR*     3.5    15.8    +      -       -      +
    183C  GLU*     2.8    50.9    +      -       -      +
    184C  GLU*     3.9     7.6    -      -       -      +
    186C  THR*     1.3    69.7    -      -       -      +
    188C  LEU*     1.3    62.1    +      -       -      +
    190C  ALA      3.2     0.3    +      -       -      -
    191C  ASP*     2.8    51.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 188 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87B  HIS*     3.6    51.8    -      -       +      +
     88B  PHE*     4.7     1.1    -      -       +      -
    111B  ILE*     4.3    27.6    -      -       +      -
    184C  GLU      2.9    20.2    +      -       -      +
    185C  ASP*     3.8     6.3    -      -       -      +
    187C  ARG*     1.3    78.2    -      -       -      +
    189C  PHE*     1.3    56.9    +      -       -      +
    191C  ASP*     3.9     5.4    -      -       +      +
    192C  THR*     2.7    34.7    +      -       -      +
    195C  ARG*     5.8     2.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 189 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88B  PHE*     4.3    23.1    -      +       -      -
    111B  ILE*     4.7     7.4    -      -       +      -
    114B  LEU*     4.2    15.0    -      -       +      -
      3C  A8S      3.7    36.3    -      -       +      -
     88C  PHE*     5.4     2.2    -      +       -      -
    114C  LEU*     4.3    13.0    -      -       +      -
    115C  PRO*     3.4    34.3    -      -       +      -
    144C  LEU*     5.2    11.7    -      -       +      -
    185C  ASP      3.1    18.0    +      -       -      +
    186C  THR*     3.8     5.2    -      -       -      +
    187C  ARG      3.2     0.2    -      -       -      -
    188C  LEU*     1.3    74.2    -      -       -      +
    190C  ALA*     1.3    69.2    +      -       +      +
    192C  THR*     3.3     5.2    +      -       -      -
    193C  VAL*     3.0    51.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 190 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3C  A8S      4.1    22.4    -      -       +      +
    144C  LEU*     4.7     9.4    -      -       +      -
    147C  TYR*     4.4     6.7    -      -       +      -
    173C  TYR*     3.6    32.3    -      -       +      +
    175C  VAL*     5.9     0.2    -      -       +      -
    186C  THR*     3.1    15.3    +      -       +      +
    189C  PHE*     1.3    79.4    -      -       -      +
    191C  ASP*     1.3    63.6    +      -       -      +
    192C  THR      3.2     0.2    +      -       -      -
    193C  VAL*     3.2     2.1    +      -       -      +
    194C  ILE*     3.0    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 191 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59C  SER*     2.8    25.6    +      -       -      -
     61C  LEU*     3.4    18.4    -      -       +      +
    173C  TYR*     2.8    24.2    +      -       -      -
    187C  ARG*     2.8    36.0    +      -       -      +
    188C  LEU*     3.9     6.7    -      -       +      +
    190C  ALA*     1.3    71.3    -      -       -      +
    192C  THR*     1.3    52.0    +      -       -      +
    195C  ARG*     2.8    53.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 192 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87B  HIS*     2.7    35.8    +      -       +      +
     88B  PHE*     4.2     8.3    -      -       +      -
    196B  LEU*     3.6    33.4    -      -       +      -
     88C  PHE*     5.8     0.9    -      -       +      -
    188C  LEU*     2.7    24.4    +      -       -      +
    189C  PHE*     3.6     7.4    -      -       -      -
    190C  ALA      3.1     0.4    -      -       -      -
    191C  ASP*     1.3    73.6    -      -       -      +
    193C  VAL*     1.3    68.8    +      -       +      +
    195C  ARG*     3.4    12.9    +      -       -      +
    196C  LEU*     2.9    36.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 193 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3C  A8S      3.7    46.4    -      -       +      +
     88C  PHE*     4.3    12.6    -      -       +      -
    189C  PHE*     3.0    55.5    +      -       +      +
    190C  ALA      3.2     3.8    +      -       -      +
    192C  THR*     1.3    77.5    -      -       +      +
    194C  ILE*     1.3    57.8    +      -       -      +
    196C  LEU*     3.3     9.5    +      -       -      +
    197C  ASN*     2.8    50.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 194 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3C  A8S      4.0    10.8    -      -       +      +
     61C  LEU*     4.1    18.4    -      -       +      -
    147C  TYR*     3.3    17.7    -      -       +      +
    171C  GLU*     3.7    36.1    -      -       +      +
    173C  TYR*     3.2    37.9    -      -       +      -
    190C  ALA      3.0    21.0    +      -       -      +
    191C  ASP      3.8     2.9    -      -       -      +
    193C  VAL*     1.3    77.3    -      -       -      +
    195C  ARG*     1.3    59.1    +      -       -      +
    197C  ASN*     3.1     9.7    +      -       -      +
    198C  LEU*     2.7    49.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 195 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87B  HIS*     4.4    12.3    -      -       -      -
    196B  LEU*     4.6     7.8    -      -       -      +
    199B  GLN*     5.8     5.9    -      -       -      +
     61C  LEU*     4.0    16.5    -      -       +      +
     63C  GLN*     4.8     2.2    -      -       -      +
    188C  LEU*     5.8     3.2    -      -       -      +
    191C  ASP*     2.8    43.3    +      -       -      +
    192C  THR*     3.7    27.5    +      -       -      +
    194C  ILE*     1.3    78.6    -      -       -      +
    196C  LEU*     1.3    62.7    +      -       +      +
    198C  LEU*     3.3     5.7    +      -       -      +
    199C  GLN*     3.0    50.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 196 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    192B  THR*     3.8    21.1    -      -       +      -
    195B  ARG*     6.0     5.4    -      -       +      -
    196B  LEU*     4.5    13.7    -      -       +      -
    199B  GLN*     5.8     2.0    -      -       -      +
     87C  HIS*     3.7    34.3    +      -       +      +
     88C  PHE*     3.6    29.6    -      -       +      -
    192C  THR*     2.9    37.5    +      -       +      +
    193C  VAL*     3.6     4.5    -      -       -      +
    195C  ARG*     1.3    75.6    -      -       +      +
    197C  ASN*     1.3    59.2    +      -       -      +
    199C  GLN*     3.3    19.0    +      -       +      +
    200C  LYS*     2.9    29.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 197 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3C  A8S      3.7    30.1    +      -       -      -
     85C  TYR*     3.5    27.2    -      -       +      +
     86C  LYS*     3.4    19.6    -      -       -      +
     87C  HIS*     2.8    25.2    +      -       -      +
     88C  PHE      4.6     1.0    +      -       -      -
    171C  GLU*     5.5     3.2    +      -       -      +
    193C  VAL*     2.8    33.9    +      -       -      +
    194C  ILE*     3.4     9.7    -      -       -      +
    196C  LEU*     1.3    75.7    -      -       -      +
    198C  LEU*     1.3    59.7    +      -       +      +
    200C  LYS      3.2     0.7    +      -       -      -
    201C  LEU*     2.8    29.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 198 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61C  LEU*     4.1    23.1    -      -       +      +
     62C  ALA      4.7     1.3    -      -       -      +
     63C  GLN*     3.6    34.7    -      -       +      +
     85C  TYR*     5.4     4.7    -      -       +      -
    151C  THR*     5.4     0.7    -      -       +      -
    169C  VAL*     3.6    32.5    -      -       +      +
    171C  GLU*     4.1    21.1    -      -       +      +
    194C  ILE*     2.7    42.1    +      -       +      +
    195C  ARG*     3.9     5.6    -      -       -      +
    197C  ASN*     1.3    76.5    -      -       +      +
    199C  GLN*     1.3    58.1    +      -       -      +
    201C  LEU*     3.5    17.5    +      -       +      +
    202C  ALA      3.0    21.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 199 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199B  GLN*     4.8    17.0    +      -       -      +
     63C  GLN*     3.6    18.9    +      -       -      +
    195C  ARG*     3.0    42.1    +      -       +      +
    196C  LEU*     3.7    23.3    -      -       -      +
    198C  LEU*     1.3    74.7    -      -       -      +
    200C  LYS*     1.3    62.0    +      -       -      +
    202C  ALA*     3.2     7.0    +      -       -      +
    203C  SER*     3.0    27.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 200 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83C  GLN      4.4     9.3    +      -       -      -
     84C  ILE      3.8    16.7    +      -       -      -
     85C  TYR*     3.1    30.3    -      -       -      +
     86C  LYS      4.5     6.5    +      -       -      -
     87C  HIS*     4.2    27.4    +      -       +      +
     89C  ILE      5.8     1.0    +      -       -      -
    196C  LEU      2.9    15.8    +      -       -      +
    197C  ASN*     4.6     0.2    -      -       -      -
    199C  GLN*     1.3    73.6    -      -       -      +
    201C  LEU*     1.3    65.6    +      -       -      +
    203C  SER*     3.2     6.8    +      -       -      -
    204C  ILE*     2.9    36.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 201 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65C  ILE*     3.9    20.9    -      -       +      -
     72C  VAL*     4.0     7.4    -      -       +      +
     75C  VAL*     3.7    32.8    -      -       +      -
     76C  VAL*     3.7    28.7    -      -       +      -
     85C  TYR*     3.7    22.1    +      -       +      -
    169C  VAL*     4.2     4.5    -      -       +      -
    197C  ASN      2.8    16.8    +      -       -      +
    198C  LEU*     3.5    23.3    -      -       +      +
    199C  GLN      3.3     0.2    -      -       -      -
    200C  LYS*     1.3    78.4    -      -       -      +
    202C  ALA*     1.3    60.7    +      -       -      +
    204C  ILE*     3.4     1.7    +      -       +      +
    205C  THR*     2.8    44.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 202 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63C  GLN*     4.1    15.0    -      -       -      +
     65C  ILE*     3.8    22.7    -      -       +      -
    198C  LEU      3.0    15.6    +      -       -      +
    199C  GLN*     3.2     8.9    +      -       -      +
    201C  LEU*     1.3    75.6    -      -       -      +
    203C  SER*     1.3    58.6    +      -       -      +
    205C  THR*     3.8     5.4    -      -       -      -
    206C  GLU*     2.8    50.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 203 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199C  GLN      3.0    16.3    +      -       -      -
    200C  LYS*     3.7     7.0    -      -       -      -
    202C  ALA*     1.3    77.2    -      -       -      +
    204C  ILE*     1.3    66.7    +      -       -      +
    206C  GLU*     4.0     6.0    -      -       -      +
    207C  ALA*     3.1    24.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 204 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75C  VAL*     4.6     3.8    -      -       +      -
     84C  ILE*     3.8    37.9    -      -       +      +
     85C  TYR*     4.8     1.8    -      -       +      -
    200C  LYS*     2.9    36.8    +      -       +      +
    201C  LEU*     3.8     6.1    -      -       -      +
    203C  SER*     1.3    79.8    -      -       -      +
    205C  THR*     1.3    69.1    +      -       +      +
    207C  ALA*     3.4     7.4    +      -       +      +
    208C  MET*     3.3    42.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 205 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65C  ILE*     3.1    24.8    -      -       -      +
     67C  ALA*     3.6    10.5    -      -       -      +
     71C  THR*     4.1     9.7    -      -       +      +
     72C  VAL*     3.6    27.9    -      -       -      +
     75C  VAL*     4.1    17.9    -      -       +      -
    201C  LEU*     2.8    42.8    +      -       +      +
    204C  ILE*     1.3    77.4    -      -       +      +
    206C  GLU*     1.3    65.1    +      -       -      +
    208C  MET*     3.0    19.7    +      -       -      +
    209C  ASN      3.2     8.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 206 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64C  ARG      4.3     1.6    -      -       -      +
     65C  ILE*     3.5    11.2    -      -       +      +
     66C  HIS*     2.8    62.9    +      -       +      +
     67C  ALA*     4.3     0.2    -      -       -      -
    202C  ALA*     2.8    32.3    +      -       -      +
    203C  SER*     4.1     4.8    -      -       -      +
    205C  THR*     1.3    77.2    +      -       -      +
    207C  ALA*     1.3    60.7    +      -       -      +
    209C  ASN*     3.1    20.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 207 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    203C  SER      3.1    19.9    +      -       -      +
    204C  ILE*     3.7     7.4    -      -       +      +
    205C  THR      3.2     0.6    -      -       -      -
    206C  GLU*     1.3    76.3    -      -       -      +
    208C  MET*     1.3    60.9    +      -       -      +
    209C  ASN      3.4     4.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 208 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71C  THR*     3.6    28.9    -      -       +      +
     74C  SER*     5.2     2.7    -      -       -      -
     75C  VAL*     3.9    20.0    -      -       +      -
     84C  ILE*     5.6     2.7    -      -       +      -
    204C  ILE*     3.3    35.5    +      -       +      +
    205C  THR*     3.0    11.5    +      -       -      +
    207C  ALA*     1.3    73.6    -      -       -      +
    209C  ASN*     1.3    61.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 209 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66C  HIS      3.3    24.3    +      -       -      +
     67C  ALA*     3.8     9.1    -      -       +      +
     68C  PRO*     3.5    27.0    -      -       +      +
    165C  ILE      5.6     2.8    +      -       -      -
    205C  THR      3.2     9.3    +      -       -      +
    206C  GLU      3.1    18.5    +      -       -      +
    207C  ALA      4.0     4.9    -      -       -      -
    208C  MET*     1.3    82.1    -      -       -      +
----------------------------------------------------------
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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