Contacts of the helix formed by residues 2 - 25 (chain H) in PDB entry 6C4Z


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 LYS 2 (chain H).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1H  SER*     1.3    77.6    +      -       -      +
      3H  LEU*     1.3    64.4    +      -       -      +
      5H  GLU*     3.5    14.5    -      -       -      +
      6H  LEU*     3.1    20.4    +      -       -      +
     16J  LYS*     5.6     2.3    -      -       -      +
     20J  LEU*     3.8    25.1    -      -       +      +
     23J  LYS*     4.9    15.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 3 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3G  LEU*     3.8    31.6    -      -       +      -
      4G  LEU*     4.1    20.4    -      -       +      -
      7G  LEU*     4.1    23.3    -      -       +      -
      1H  SER      3.3     5.5    -      -       -      +
      2H  LYS*     1.3    76.1    -      -       -      +
      4H  LEU*     1.3    55.9    +      -       +      +
      6H  LEU*     2.8    17.8    +      -       +      +
      7H  LEU*     2.7    52.5    +      -       +      +
     20J  LEU*     3.9    17.9    -      -       +      +
     24J  TRP*     4.8    12.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 4 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24E  TRP*     4.2     9.4    -      -       +      -
     18F  ILE*     4.7     3.1    -      -       +      +
     21F  LEU*     4.0    24.5    -      -       +      +
     22F  GLU*     3.9    22.0    -      -       +      +
     25F  GLY*     3.8    36.8    -      -       -      +
     26F  NH2      4.4     0.4    -      -       -      +
      3G  LEU*     3.6    31.2    -      -       +      -
      1H  SER*     3.6    24.1    +      -       -      +
      3H  LEU*     1.3    78.2    -      -       +      +
      5H  GLU*     1.3    51.4    +      -       -      +
      7H  LEU*     3.1    13.1    +      -       +      +
      8H  ARG*     2.8    35.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 5 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22F  GLU*     3.9    14.7    +      -       -      +
      1H  SER      3.3    11.8    +      -       -      +
      2H  LYS*     3.5    16.0    -      -       -      +
      4H  LEU*     1.3    78.4    -      -       -      +
      6H  LEU*     1.3    62.0    +      -       -      +
      8H  ARG*     3.3    25.7    +      -       -      +
      9H  LYS*     3.1    33.1    +      -       +      +
     16J  LYS*     5.0    11.2    -      -       +      +
     19J  GLU*     5.6     2.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 6 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7G  LEU*     4.2    17.9    -      -       +      -
      2H  LYS      3.1     9.8    +      -       -      +
      3H  LEU*     2.8    18.3    +      -       +      +
      5H  GLU*     1.3    74.0    -      -       -      +
      7H  LEU*     1.3    64.8    +      -       -      +
      9H  LYS*     2.9    14.6    +      -       -      +
     10H  LEU*     3.1    30.6    +      -       +      -
     14I  LEU*     5.3     1.6    -      -       +      -
     18I  ILE*     5.8     0.9    -      -       +      -
     21I  LEU*     3.8    29.8    -      -       +      -
     13J  ALA*     3.7    27.8    -      -       +      +
     16J  LYS*     4.4    15.0    -      -       +      +
     17J  ALA*     4.1    11.9    -      -       +      +
     20J  LEU*     3.9    15.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 7 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18F  ILE*     3.9    14.8    -      -       +      +
     21F  LEU*     5.8     1.1    -      -       +      -
      3G  LEU*     3.6    33.4    -      -       +      +
      6G  LEU*     4.2    14.4    -      -       +      -
      7G  LEU*     3.7    45.1    -      -       +      +
     10G  LEU*     3.8    18.7    -      -       +      +
      3H  LEU*     2.7    25.7    +      -       +      +
      4H  LEU*     3.3    20.9    -      -       +      +
      6H  LEU*     1.3    72.6    -      -       -      +
      8H  ARG*     1.3    62.5    +      -       -      +
     10H  LEU*     3.0     9.2    +      -       -      +
     11H  GLY*     3.0    20.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 8 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15F  HIS*     4.7     3.4    +      -       +      +
     18F  ILE*     3.6    16.3    -      -       +      +
     19F  GLU*     4.4    25.1    -      -       +      +
     22F  GLU*     3.0    36.5    +      -       +      -
      4H  LEU      2.8    16.3    +      -       -      +
      5H  GLU*     3.5    32.8    +      -       -      +
      6H  LEU      3.2     0.2    -      -       -      -
      7H  LEU*     1.3    72.8    -      -       -      +
      9H  LYS*     1.3    86.8    +      -       -      +
     11H  GLY*     3.5     1.8    +      -       -      +
     12H  GLU*     3.3    45.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 9 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5H  GLU*     3.1    23.7    +      -       +      +
      6H  LEU*     2.9    11.4    +      -       -      +
      8H  ARG*     1.3   100.6    -      -       -      +
     10H  LEU*     1.3    60.9    +      -       -      +
     12H  GLU*     3.6    17.4    +      -       -      +
     13H  ALA*     3.1    26.9    +      -       -      +
      9J  LYS*     4.5     8.8    -      -       +      +
     12J  GLU*     3.4    40.9    +      -       +      +
     13J  ALA*     4.1    25.6    -      -       +      +
     16J  LYS*     5.4     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 10 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7G  LEU*     3.3    33.4    -      -       +      +
     10G  LEU*     4.5    25.5    -      -       +      +
     11G  GLY*     5.1     1.3    -      -       -      +
     14G  LEU*     3.8    15.5    -      -       +      +
      6H  LEU*     3.1    23.9    +      -       +      +
      7H  LEU*     3.0    10.6    +      -       -      +
      9H  LYS*     1.3    75.7    -      -       -      +
     11H  GLY*     1.3    60.6    +      -       -      +
     13H  ALA*     3.4     4.1    +      -       +      +
     14H  LEU*     2.9    32.2    +      -       -      +
     14I  LEU*     3.7    34.3    -      -       +      -
     18I  ILE*     4.3    11.9    -      -       +      -
     13J  ALA*     3.9    10.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 11 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11F  GLY      5.2     0.7    -      -       -      +
     14F  LEU*     5.8     1.3    -      -       -      -
     15F  HIS*     4.3    15.0    -      -       -      +
     18F  ILE*     4.1    20.5    -      -       -      +
     10G  LEU*     4.7     4.2    -      -       -      +
      7H  LEU      3.0    13.1    +      -       -      -
      8H  ARG*     3.9     4.0    -      -       -      -
      9H  LYS      3.4     0.2    -      -       -      -
     10H  LEU*     1.3    76.9    -      -       -      +
     12H  GLU*     1.3    51.5    +      -       -      +
     14H  LEU*     3.3     6.5    +      -       -      +
     15H  HIS*     2.8    35.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 12 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15F  HIS*     3.3    30.3    +      -       +      +
     19F  GLU*     5.0     1.0    -      -       -      +
      8H  ARG*     3.3    34.8    +      -       -      +
      9H  LYS*     3.8    17.6    +      -       -      +
     10H  LEU      3.3     0.2    -      -       -      -
     11H  GLY*     1.3    73.0    -      -       -      +
     13H  ALA*     1.3    55.8    +      -       -      +
     15H  HIS*     3.1    10.1    +      -       -      +
     16H  LYS*     2.8    39.7    +      -       +      +
      9J  LYS*     3.1    41.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 13 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14G  LEU*     4.3     7.9    -      -       +      -
      9H  LYS      3.1    14.6    +      -       -      +
     10H  LEU*     3.6     9.4    -      -       +      +
     12H  GLU*     1.3    78.3    -      -       -      +
     14H  LEU*     1.3    57.9    +      -       -      +
     16H  LYS*     3.3     4.6    +      -       -      +
     17H  ALA*     2.9    29.8    +      -       -      +
      6J  LEU*     3.8     5.6    -      -       +      +
      9J  LYS*     4.1    24.0    -      -       +      +
     10J  LEU*     4.2    26.5    -      -       +      +
     13J  ALA*     5.4     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 14 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6E  LEU*     5.0     1.1    -      -       +      -
     10E  LEU*     3.7    21.1    -      -       +      -
     11F  GLY*     5.8     1.1    -      -       -      -
     14F  LEU*     3.8     7.9    -      -       +      -
     10G  LEU*     3.8    30.1    -      -       +      +
     13G  ALA*     4.0    18.2    -      -       +      +
     14G  LEU*     3.9    35.1    -      -       +      +
     17G  ALA*     4.4     7.4    -      -       +      -
     10H  LEU      2.9    17.5    +      -       -      +
     11H  GLY*     3.5     4.5    -      -       -      +
     13H  ALA*     1.3    73.0    -      -       -      +
     15H  HIS*     1.3    67.0    +      -       -      +
     17H  ALA*     3.3     2.2    +      -       -      +
     18H  ILE*     3.0    49.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 15 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8F  ARG*     4.8     3.1    -      -       +      -
     11F  GLY*     4.1    11.8    +      -       -      +
     12F  GLU*     3.3    43.1    +      -       +      +
     15F  HIS*     4.5    20.6    +      +       +      -
     11H  GLY      2.8    21.3    +      -       -      +
     12H  GLU*     3.3     9.5    +      -       -      +
     14H  LEU*     1.3    74.3    -      -       -      +
     16H  LYS*     1.3    69.4    +      -       -      +
     18H  ILE*     3.4     8.9    +      -       +      +
     19H  GLU*     2.7    58.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 16 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12H  GLU*     2.8    26.3    +      -       +      +
     13H  ALA*     3.6     4.7    -      -       -      +
     15H  HIS*     1.3    80.1    -      -       -      +
     17H  ALA*     1.3    63.7    -      -       -      +
     19H  GLU*     3.3    19.5    +      -       -      +
     20H  LEU*     3.0    24.7    +      -       -      +
      2J  LYS      5.3     2.9    -      -       -      +
      5J  GLU*     4.0    26.5    -      -       +      +
      6J  LEU*     4.5    20.4    -      -       +      +
      8J  ARG*     5.1     4.8    -      -       -      +
      9J  LYS*     4.1    28.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 17 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14G  LEU*     4.4     7.4    -      -       +      -
     17G  ALA*     4.3    16.6    -      -       +      -
     18G  ILE*     5.6     1.3    -      -       +      -
     21G  LEU*     4.1    18.7    -      -       +      +
     13H  ALA      2.9    20.6    +      -       -      +
     14H  LEU*     3.3     8.3    +      -       -      +
     16H  LYS*     1.3    72.7    -      -       -      +
     18H  ILE*     1.3    58.2    +      -       -      +
     20H  LEU*     3.4     3.9    +      -       -      +
     21H  LEU*     3.0    31.3    +      -       -      +
      6J  LEU*     4.2    19.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 18 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6E  LEU*     5.1    13.0    -      -       +      -
     10E  LEU*     3.8    37.7    -      -       +      -
      4F  LEU*     4.8     2.6    -      -       +      +
      7F  LEU*     3.8    12.3    -      -       +      +
      8F  ARG*     3.5    35.7    -      -       +      +
     11F  GLY*     4.2    16.8    -      -       -      -
     17G  ALA*     5.1     3.1    -      -       +      -
     14H  LEU*     3.0    34.0    +      -       +      +
     15H  HIS*     3.8     4.7    -      -       +      +
     17H  ALA*     1.3    72.2    -      -       +      +
     19H  GLU*     1.3    60.9    +      -       -      +
     21H  LEU*     3.2    11.9    +      -       +      +
     22H  GLU*     2.9    27.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 19 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8F  ARG*     4.0    24.5    -      -       +      +
     12F  GLU*     4.5     5.0    -      -       -      +
     15H  HIS*     2.7    51.6    +      -       +      +
     16H  LYS*     3.3    24.3    +      -       -      +
     18H  ILE*     1.3    77.0    -      -       -      +
     20H  LEU*     1.3    60.6    +      -       -      +
     22H  GLU*     3.3    11.2    +      -       -      +
     23H  LYS*     3.0    21.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 20 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21G  LEU*     3.7    22.0    -      -       +      -
     16H  LYS      3.0    13.6    +      -       -      +
     17H  ALA      3.5     8.5    -      -       -      +
     19H  GLU*     1.3    73.4    -      -       -      +
     21H  LEU*     1.3    65.9    +      -       -      +
     23H  LYS*     3.0    11.7    +      -       +      +
     24H  TRP*     2.9    56.8    +      -       +      +
      2J  LYS*     4.2    26.5    -      -       +      +
      3J  LEU*     4.1    24.9    -      -       +      +
      6J  LEU*     3.8    23.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 21 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6E  LEU*     4.1    19.3    -      -       +      -
      4F  LEU*     4.7     9.6    -      -       +      -
      7F  LEU*     5.5     2.9    -      -       +      -
     17G  ALA*     4.1    13.0    -      -       +      +
     20G  LEU*     4.0    36.3    -      -       +      -
     21G  LEU*     3.9    19.4    -      -       +      +
     24G  TRP*     3.4    45.4    -      -       +      -
     17H  ALA      3.0    15.2    +      -       -      +
     18H  ILE*     3.2    15.3    -      -       +      +
     20H  LEU*     1.3    74.8    -      -       -      +
     22H  GLU*     1.3    52.7    +      -       -      +
     24H  TRP*     3.1     3.1    +      -       +      -
     25H  GLY*     2.7    34.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 22 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1F  SER      5.3     1.5    -      -       -      +
      4F  LEU*     3.9    34.2    -      -       +      +
      5F  GLU*     3.8    12.3    -      -       -      +
      8F  ARG*     2.8    47.3    +      -       +      +
     18H  ILE      2.9    12.4    +      -       -      +
     19H  GLU*     3.4    12.6    -      -       -      +
     21H  LEU*     1.3    74.8    -      -       -      +
     23H  LYS*     1.3    64.4    +      -       -      +
     25H  GLY      3.0    18.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 23 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19H  GLU      3.0    12.9    +      -       -      +
     20H  LEU*     3.0    15.7    +      -       +      +
     22H  GLU*     1.3    78.4    +      -       -      +
     24H  TRP*     1.3    70.0    +      -       +      +
     25H  GLY      3.8     4.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 24 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21G  LEU*     3.5    30.7    -      -       +      -
     24G  TRP*     4.5    16.7    -      +       +      +
     25G  GLY*     3.4    36.1    -      -       -      -
     20H  LEU*     2.9    50.5    +      -       +      +
     21H  LEU*     3.8     3.4    -      -       -      +
     23H  LYS*     1.3    83.8    -      -       +      +
     25H  GLY*     1.3    64.1    +      -       -      +
      4I  LEU*     4.2    18.6    -      -       +      -
      7I  LEU*     6.4     0.2    -      -       +      -
      3J  LEU*     4.4    17.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 25 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4F  LEU*     4.1     8.6    -      -       -      +
     24G  TRP*     3.4    27.5    -      -       -      -
     21H  LEU      2.7    16.9    +      -       -      -
     22H  GLU      3.0    15.6    +      -       -      +
     23H  LYS      3.8     4.2    -      -       -      +
     24H  TRP*     1.3    77.4    -      -       -      +
     26H  NH2      1.3    47.5    +      -       -      -
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il