Contacts of the helix formed by residues 176 - 199 (chain C) in PDB entry 2ONK


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 VAL 176 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82A  PHE*     4.0    19.1    -      -       +      -
     84A  HIS*     4.2     2.9    -      -       -      -
     93A  TYR*     3.9    10.1    -      -       +      +
    154C  VAL*     4.7     0.9    -      -       +      -
    158C  LEU*     3.9    28.9    -      -       +      +
    159C  GLU*     4.2     7.0    -      -       +      -
    162C  ALA*     3.5    29.4    -      -       +      -
    172C  VAL*     2.6    22.7    +      -       +      +
    175C  THR*     1.3    78.7    -      -       -      +
    177C  SER*     1.3    70.3    +      -       -      +
    178C  LEU      3.6     0.2    -      -       -      -
    179C  PRO*     3.3     4.7    -      -       -      +
    180C  LEU*     3.1    39.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 177 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74C  TYR*     3.8    13.2    +      -       -      -
    151C  PHE*     4.3     7.4    -      -       -      -
    154C  VAL*     4.0     7.9    -      -       -      +
    159C  GLU*     3.0    34.3    +      -       -      +
    172C  VAL*     3.2     2.8    +      -       -      +
    173C  PHE*     3.3    30.7    -      -       -      -
    176C  VAL*     1.3    82.0    -      -       -      +
    178C  LEU*     1.3    65.7    -      -       -      +
    180C  LEU*     3.5     3.1    -      -       -      +
    181C  SER*     3.0    23.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 178 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70C  THR*     4.4     3.8    -      -       +      -
    151C  PHE*     3.5    20.4    -      -       +      -
    173C  PHE*     2.7    57.9    +      -       +      +
    174C  PHE*     3.9    27.6    -      -       +      +
    177C  SER*     1.3    71.6    -      -       -      +
    179C  PRO*     1.4    65.0    -      -       +      +
    181C  SER*     2.8    27.2    +      -       -      -
    182C  VAL*     2.9    16.4    +      -       +      +
    185C  ILE*     4.2    15.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 179 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84A  HIS*     3.7    23.2    -      -       +      +
    174C  PHE      3.1    26.5    -      -       -      +
    175C  THR*     3.0    29.4    -      -       -      +
    176C  VAL      3.3     9.0    -      -       -      +
    178C  LEU*     1.4    89.5    -      -       +      +
    180C  LEU*     1.3    57.9    +      -       -      +
    182C  VAL*     3.5    24.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 180 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82A  PHE*     5.8     0.2    -      -       +      -
     83A  PRO*     3.4    24.0    -      -       +      -
     84A  HIS*     3.4    33.2    -      -       +      +
    153C  SER*     4.9     3.6    +      -       -      -
    154C  VAL*     3.4    39.5    -      -       +      +
    158C  LEU*     3.9    14.8    -      -       +      -
    176C  VAL*     3.1    34.5    +      -       +      +
    177C  SER      3.1     0.4    +      -       -      -
    178C  LEU      2.8     1.2    +      -       -      -
    179C  PRO*     1.3    81.9    -      -       -      +
    181C  SER*     1.3    57.7    +      -       -      +
    182C  VAL      3.3     1.5    +      -       -      -
    183C  ARG*     4.9     2.6    +      -       -      +
    184C  HIS*     5.0     2.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 181 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    147C  ALA      5.2     0.2    -      -       -      -
    150C  GLY*     3.4    35.2    -      -       -      -
    151C  PHE*     3.5    23.4    -      -       -      -
    153C  SER*     5.1     0.2    -      -       -      -
    154C  VAL*     4.5     2.0    -      -       -      -
    177C  SER      3.0    15.6    +      -       -      -
    178C  LEU*     2.8     8.4    +      -       -      -
    180C  LEU*     1.3    71.7    -      -       -      +
    182C  VAL*     1.3    66.3    +      -       -      +
    183C  ARG      3.3     2.9    -      -       -      -
    184C  HIS*     2.7    22.1    +      -       -      +
    185C  ILE*     3.0    16.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 182 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178C  LEU*     2.9    21.5    +      -       +      +
    179C  PRO*     3.5    22.7    -      -       +      +
    180C  LEU      3.3     2.4    -      -       -      -
    181C  SER*     1.3    76.8    -      -       -      +
    183C  ARG*     1.3    54.8    +      -       -      +
    184C  HIS      2.6    12.3    +      -       -      -
    185C  ILE*     2.9    12.7    +      -       +      -
    186C  VAL*     2.8    39.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 183 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    180C  LEU      4.9     2.7    +      -       -      +
    181C  SER      3.2     1.4    +      -       -      -
    182C  VAL*     1.3    77.9    -      -       -      +
    184C  HIS*     1.3    64.8    +      -       +      +
    186C  VAL*     4.2     6.9    -      -       +      +
    187C  ALA*     3.6    17.5    +      -       -      +
    251C  VAL*     4.2    34.1    +      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 184 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146C  GLN*     3.7    33.4    +      -       -      +
    147C  ALA*     5.0     1.1    -      -       -      -
    149C  GLU*     4.3    13.5    -      -       +      +
    150C  GLY*     3.2    35.5    +      -       -      -
    153C  SER*     3.7    22.2    +      -       -      -
    180C  LEU      5.0     2.2    -      -       -      -
    181C  SER*     2.7    18.1    +      -       -      +
    182C  VAL      2.6     4.8    +      -       -      -
    183C  ARG*     1.3    80.2    +      -       +      +
    185C  ILE*     1.3    56.9    +      -       -      +
    186C  VAL      3.1     1.3    -      -       -      -
    187C  ALA      3.7     0.4    -      -       -      +
    188C  GLY*     2.7    32.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 185 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66C  VAL*     4.5    12.3    -      -       +      -
     70C  THR*     4.5     5.8    -      -       +      +
    143C  TYR*     3.1    32.0    -      -       +      +
    147C  ALA*     5.0    11.7    -      -       +      +
    151C  PHE*     4.4    11.0    -      -       +      -
    178C  LEU*     4.2    29.8    -      -       +      +
    181C  SER*     3.0    21.3    +      -       -      +
    182C  VAL*     2.9    13.4    +      -       +      +
    184C  HIS*     1.3    77.6    -      -       +      +
    186C  VAL*     1.3    58.4    +      -       +      +
    189C  ALA*     2.8    29.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 186 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182C  VAL*     2.8    32.3    +      -       +      +
    183C  ARG*     4.5     5.6    -      -       -      +
    185C  ILE*     1.3    80.8    -      -       +      +
    187C  ALA*     1.3    68.2    +      -       -      +
    189C  ALA*     3.1     6.7    +      -       -      +
    190C  ILE*     2.9    33.7    +      -       +      +
    251C  VAL*     4.3    30.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 187 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146C  GLN*     4.1    12.1    -      -       -      +
    183C  ARG      3.6    17.3    +      -       -      +
    184C  HIS      3.3     4.9    +      -       -      +
    186C  VAL*     1.3    82.4    -      -       -      +
    188C  GLY*     1.3    64.9    +      -       -      +
    190C  ILE*     3.1     9.1    +      -       -      +
    191C  MET*     2.8    35.4    +      -       +      +
    251C  VAL*     6.5     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 188 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143C  TYR*     3.4    16.8    -      -       -      -
    146C  GLN*     3.5    27.5    -      -       -      +
    184C  HIS      2.7    21.4    +      -       -      -
    185C  ILE      3.7     1.3    -      -       -      -
    187C  ALA*     1.3    75.1    -      -       -      +
    189C  ALA*     1.3    60.4    +      -       -      +
    191C  MET*     3.2     4.2    +      -       -      +
    192C  SER*     3.0    23.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 189 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62C  THR*     3.7    23.5    +      -       +      -
     66C  VAL*     4.2    11.4    -      -       +      -
    143C  TYR*     3.4     8.4    -      -       -      -
    185C  ILE*     2.8    22.0    +      -       +      +
    186C  VAL*     3.1     6.9    +      -       -      +
    188C  GLY*     1.3    72.2    -      -       -      +
    190C  ILE*     1.3    65.9    +      -       +      +
    192C  SER*     2.9    15.7    +      -       -      -
    193C  TRP*     2.9    13.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 190 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186C  VAL*     2.9    30.4    +      -       +      +
    187C  ALA*     3.5    11.0    -      -       -      +
    189C  ALA*     1.3    77.1    -      -       +      +
    191C  MET*     1.3    65.6    +      -       +      +
    193C  TRP*     3.2     8.7    +      -       -      +
    194C  ALA*     3.0    21.0    +      -       -      +
    244C  PHE*     4.0    24.9    -      -       +      -
    247C  LEU*     3.6    48.5    -      -       +      +
    251C  VAL*     5.0     4.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 191 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142C  ILE*     3.9    19.1    -      -       +      +
    146C  GLN*     3.3    37.2    -      -       +      +
    187C  ALA*     2.8    27.6    +      -       +      +
    188C  GLY      3.5     3.8    -      -       -      +
    190C  ILE*     1.3    78.0    -      -       +      +
    192C  SER*     1.3    61.6    +      -       -      +
    194C  ALA*     3.3     8.8    +      -       -      +
    195C  ARG*     3.1    20.6    +      -       -      +
     95D  VAL*     5.2    12.4    -      -       +      +
    145D  ASN*     5.5     8.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 192 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61C  SER*     4.7     1.7    +      -       -      -
     62C  THR*     2.7    31.6    +      -       -      +
     65C  ALA*     5.3     2.2    -      -       -      -
    139C  SER*     3.4    32.4    +      -       -      -
    142C  ILE*     3.8     6.2    -      -       -      +
    143C  TYR*     4.0    19.4    -      -       -      +
    188C  GLY      3.0    11.8    +      -       -      -
    189C  ALA*     2.9     8.5    +      -       -      -
    191C  MET*     1.3    75.1    -      -       -      +
    193C  TRP*     1.3    63.7    +      -       -      +
    195C  ARG*     3.3     0.8    +      -       -      -
    196C  GLY*     3.1    18.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 193 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55C  TYR*     3.1    48.1    +      +       +      -
     58C  ALA*     3.6     9.2    -      -       +      +
     59C  LEU*     3.5    40.3    -      -       +      +
     62C  THR*     3.5    11.2    -      -       +      +
    189C  ALA      2.9    11.1    +      -       -      +
    190C  ILE*     3.4    11.4    -      -       -      +
    192C  SER*     1.3    76.8    +      -       -      +
    194C  ALA*     1.3    66.0    +      -       -      +
    196C  GLY*     3.2     1.8    +      -       -      +
    197C  ILE*     3.0    53.3    +      -       +      +
    243C  VAL*     3.5    27.8    -      -       +      -
    244C  PHE*     3.2    39.0    -      +       -      -
    247C  LEU*     5.0     7.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 194 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190C  ILE      3.0     8.9    +      -       -      +
    191C  MET*     3.6    10.5    -      -       -      +
    193C  TRP*     1.3    77.7    -      -       -      +
    195C  ARG*     1.3    60.7    +      -       -      +
    197C  ILE*     3.7     5.9    -      -       -      +
    198C  SER*     3.0    28.9    +      -       -      -
    244C  PHE*     3.7    33.2    -      -       +      -
     95D  VAL*     3.5    28.0    -      -       +      +
     96D  VAL*     4.7     3.5    -      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
     99C  HIS*     3.3    23.6    -      -       -      -
    138C  VAL*     2.7    44.5    +      -       +      +
    139C  SER*     3.6    21.3    -      -       -      -
    142C  ILE*     4.0    21.6    -      -       +      +
    191C  MET      3.1    13.1    +      -       -      +
    192C  SER      3.4     8.7    -      -       -      +
    193C  TRP      3.0     0.4    -      -       -      -
    194C  ALA*     1.3    76.2    -      -       -      +
    196C  GLY*     1.3    67.1    +      -       -      +
    198C  SER*     3.1    12.8    +      -       -      -
    199C  GLU*     2.7    41.7    +      -       -      +
     95D  VAL*     5.1     4.5    -      -       +      -
     99D  HIS*     3.8    14.5    +      -       -      -
    195D  ARG*     4.9     7.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 196 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58C  ALA*     4.2     4.3    -      -       -      -
     61C  SER*     5.2     0.4    -      -       -      -
    135C  MET*     2.8    52.8    -      -       -      +
    139C  SER*     4.4     1.3    -      -       -      -
    192C  SER      3.1    11.0    +      -       -      -
    193C  TRP      3.2     2.2    +      -       -      -
    195C  ARG*     1.3    78.1    -      -       -      +
    197C  ILE*     1.3    63.8    +      -       -      +
    199C  GLU*     3.1    16.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 197 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54C  THR*     3.9    18.9    -      -       +      +
     55C  TYR*     3.1    43.7    -      -       +      +
     58C  ALA*     3.8    11.0    -      -       +      +
    135C  MET*     4.2     1.2    -      -       -      +
    193C  TRP*     3.0    50.8    +      -       +      +
    194C  ALA*     3.7     7.6    -      -       -      +
    196C  GLY*     1.3    76.9    -      -       -      +
    198C  SER*     1.3    67.3    +      -       -      +
    199C  GLU      3.4     1.0    +      -       -      +
    213C  ALA*     5.7     0.2    -      -       -      +
    214C  PRO*     3.6    18.9    -      -       -      +
    240C  SER*     4.9     4.0    -      -       -      +
    244C  PHE*     4.6     6.3    -      -       +      -
     96D  VAL      4.2    12.3    -      -       -      +
     98D  PRO*     3.9     9.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 198 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    194C  ALA      3.0    16.5    +      -       -      -
    195C  ARG*     3.1     8.5    +      -       -      -
    197C  ILE*     1.3    76.1    -      -       -      +
    199C  GLU*     1.3    63.5    +      -       -      +
    200C  PHE*     4.6     0.2    -      -       -      +
    214C  PRO*     4.5     0.3    -      -       -      +
     94D  PRO      5.5     0.9    -      -       -      -
     95D  VAL      3.6     8.7    +      -       -      -
     96D  VAL      3.5     8.8    +      -       -      -
     97D  ILE      3.5     8.2    +      -       -      -
     98D  PRO*     3.3    30.1    -      -       -      +
     99D  HIS*     3.0    38.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 199 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99C  HIS*     3.4    11.8    +      -       -      +
    135C  MET*     4.8     3.6    -      -       +      -
    138C  VAL*     4.2     9.8    -      -       +      +
    195C  ARG*     2.7    44.5    +      -       -      +
    196C  GLY*     3.1    18.1    +      -       -      +
    197C  ILE      4.1     1.0    -      -       -      +
    198C  SER*     1.3    78.1    -      -       -      +
    200C  PHE*     1.3    64.5    +      -       -      +
    201C  GLY      3.6     0.7    +      -       -      -
    202C  ALA*     2.6    40.2    +      -       +      +
    203C  VAL*     3.6    31.1    -      -       +      +
    212C  ILE*     4.8     4.3    -      -       -      +
    214C  PRO*     3.4    17.2    -      -       -      +
     99D  HIS*     2.9    12.3    +      -       -      -
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
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  Atomic class           I  II  III   IV   V   VI  VII  VIII
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   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
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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