Contacts of the helix formed by residues 179 - 206 (chain C) in PDB entry 3H90


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with ASP 179 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104C  HIS*     4.4    19.4    +      -       +      +
    110C  PRO*     5.8     4.2    -      -       -      +
    111C  MET      6.0     0.2    +      -       -      -
    112C  THR*     4.2    19.1    +      -       -      -
    161C  ASN*     5.3     3.9    +      -       -      +
    164C  ILE*     3.4    29.3    -      -       -      +
    178C  ALA*     1.3    78.4    -      -       -      +
    180C  ALA*     1.3    57.4    +      -       -      +
    182C  PHE*     2.8    11.9    +      -       +      +
    183C  ALA*     2.8    40.4    +      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 180 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101C  GLY      3.7    18.7    -      -       -      +
    104C  HIS*     3.8    23.4    -      -       -      +
    105C  LEU*     3.8    25.6    -      -       +      -
    106C  ILE*     5.8     0.7    -      -       +      -
    178C  ALA*     3.2     9.9    -      -       +      +
    179C  ASP*     1.3    77.5    -      -       -      +
    181C  LEU*     1.3    56.5    +      -       -      +
    183C  ALA*     4.7     4.0    -      -       -      +
    184C  LEU*     2.9    36.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 181 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177C  ARG*     4.3    29.2    -      -       +      +
    178C  ALA      4.1     8.5    +      -       -      +
    179C  ASP      3.0     1.0    +      -       -      -
    180C  ALA*     1.3    78.6    -      -       -      +
    182C  PHE*     1.3    76.9    +      -       +      +
    184C  LEU*     4.3     5.3    -      -       -      +
    185C  GLY*     3.3    20.4    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 182 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    161C  ASN*     3.2    38.1    -      -       -      +
    163C  ALA*     5.1    12.8    -      -       +      -
    178C  ALA      5.5     2.9    -      -       -      -
    179C  ASP*     2.8     9.5    +      -       -      +
    181C  LEU*     1.3    96.3    -      -       +      +
    183C  ALA*     1.3    59.0    +      -       -      +
    184C  LEU      3.1     1.3    -      -       -      -
    185C  GLY*     3.0     2.4    +      -       -      -
    186C  ILE*     2.9    43.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 183 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97C  LEU*     3.0    39.7    -      -       +      +
    100C  THR*     5.7     1.3    -      -       +      -
    101C  GLY*     4.4     6.1    -      -       -      +
    104C  HIS*     4.9     8.1    -      -       +      +
    179C  ASP*     2.8    32.4    +      -       +      +
    180C  ALA*     4.5     2.7    -      -       -      +
    182C  PHE*     1.3    71.7    -      -       -      +
    184C  LEU*     1.3    58.1    +      -       -      +
    186C  ILE*     4.4     8.9    -      -       -      +
    187C  GLY      3.7    10.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 184 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97C  LEU      4.5     1.6    -      -       -      -
     98C  PHE*     3.8    23.0    -      -       +      -
    101C  GLY*     3.8    21.7    -      -       -      +
    102C  ILE*     3.5    33.0    -      -       +      +
    105C  LEU*     5.7     2.7    -      -       +      -
    180C  ALA      2.9    20.8    +      -       -      +
    181C  LEU*     4.7     5.2    -      -       -      +
    183C  ALA*     1.3    76.3    -      -       -      +
    185C  GLY*     1.3    65.6    +      -       -      +
    187C  GLY*     3.2    10.7    +      -       -      -
    188C  ILE*     3.2    35.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 185 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181C  LEU      3.3    12.5    +      -       -      -
    182C  PHE*     3.0     6.9    +      -       -      -
    184C  LEU*     1.3    78.3    -      -       -      +
    186C  ILE*     1.3    63.2    +      -       -      +
    188C  ILE*     3.4    17.0    +      -       -      +
    189C  TYR*     3.4    21.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 186 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97C  LEU*     4.7    15.3    -      -       +      -
    156C  SER*     4.6     5.8    -      -       -      +
    159C  MET*     3.6    58.1    -      -       +      +
    161C  ASN*     5.4     7.2    -      -       -      +
    182C  PHE*     2.9    32.7    +      -       +      +
    183C  ALA*     4.5     7.6    -      -       -      +
    185C  GLY*     1.3    74.3    -      -       -      +
    187C  GLY*     1.3    58.7    +      -       -      +
    189C  TYR*     3.2     6.2    +      -       -      -
    190C  ILE*     2.9    47.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 187 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94C  ALA*     3.5    25.0    -      -       -      +
     97C  LEU*     4.7     4.0    -      -       -      +
     98C  PHE*     4.1    13.0    -      -       -      +
    183C  ALA      3.7     9.5    +      -       -      -
    184C  LEU      3.2     9.1    +      -       -      -
    186C  ILE*     1.3    80.3    -      -       -      +
    188C  ILE*     1.3    59.4    +      -       -      +
    191C  LEU*     3.2    26.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 188 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98C  PHE*     3.7    22.0    -      -       +      -
    184C  LEU*     3.2    38.3    +      -       +      +
    185C  GLY*     3.4    11.9    +      -       -      +
    186C  ILE      3.3     0.4    -      -       -      -
    187C  GLY*     1.3    74.1    -      -       -      +
    189C  TYR*     1.3    63.3    +      -       -      +
    191C  LEU*     3.9     9.2    -      -       +      +
    192C  TYR*     3.1    24.1    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 189 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152C  LEU*     5.8     0.9    -      -       +      -
    155C  GLN*     6.1     1.0    -      -       +      -
    159C  MET*     4.0    22.2    -      -       +      -
    185C  GLY      3.4     9.4    +      -       -      +
    186C  ILE*     3.2     7.3    +      -       -      +
    188C  ILE*     1.3    80.0    -      -       -      +
    190C  ILE*     1.3    78.7    +      -       +      +
    192C  TYR*     3.3    13.4    +      +       -      +
    193C  SER*     2.7    48.8    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 190 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90C  ILE*     4.0    22.9    -      -       +      +
     94C  ALA*     4.0    13.2    -      -       +      -
    152C  LEU*     4.0    21.8    -      -       +      +
    155C  GLN*     4.8     3.8    -      -       +      -
    156C  SER*     3.2    35.9    -      -       -      +
    159C  MET*     4.7     5.4    -      -       +      -
    186C  ILE*     2.9    33.6    +      -       +      +
    187C  GLY*     5.2     0.2    -      -       -      -
    189C  TYR*     1.3    95.6    -      -       +      +
    191C  LEU*     1.3    61.4    +      -       -      +
    193C  SER*     3.9     1.8    -      -       -      -
    194C  ALA*     2.8    28.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 191 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91C  SER*     3.4    36.5    +      -       -      +
     94C  ALA*     3.5    12.4    -      -       +      +
     95C  LEU*     4.4    24.5    -      -       +      -
     98C  PHE*     6.2     4.7    -      -       +      -
    187C  GLY      3.2    22.5    +      -       -      +
    188C  ILE*     3.9     8.7    -      -       +      +
    190C  ILE*     1.3    75.4    -      -       -      +
    192C  TYR*     1.3    58.9    +      -       -      +
    194C  ALA*     3.3     3.0    +      -       -      +
    195C  LEU*     2.8    50.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 192 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    188C  ILE*     3.1    17.4    +      -       +      +
    189C  TYR*     3.4    14.6    -      +       -      +
    191C  LEU*     1.3    83.8    -      -       +      +
    193C  SER*     1.3    61.1    +      -       -      +
    195C  LEU*     3.3    10.4    +      -       +      +
    196C  ARG*     3.0    56.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 193 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152C  LEU*     3.7    23.1    -      -       -      +
    189C  TYR*     2.7    36.5    +      -       -      -
    190C  ILE*     3.6    12.3    -      -       -      -
    191C  LEU      3.2     0.4    -      -       -      -
    192C  TYR*     1.3    81.9    -      -       -      +
    194C  ALA*     1.3    55.9    +      -       -      +
    196C  ARG*     3.9     4.1    -      -       -      +
    197C  MET*     3.1    26.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 194 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87C  SER*     3.5    29.7    -      -       -      +
     90C  ILE*     3.8     8.1    -      -       +      -
     91C  SER*     3.7    17.0    -      -       -      +
    152C  LEU*     3.4    19.2    -      -       +      +
    190C  ILE      2.8    21.3    +      -       -      +
    191C  LEU      3.9     2.5    -      -       -      +
    193C  SER*     1.3    71.6    -      -       -      +
    195C  LEU*     1.3    60.2    +      -       -      +
    197C  MET*     3.3     3.4    -      -       -      +
    198C  GLY*     2.9    25.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 195 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91C  SER*     4.2    10.7    +      -       -      +
    191C  LEU*     2.8    45.2    +      -       +      +
    192C  TYR*     3.3    10.1    +      -       +      +
    194C  ALA*     1.3    77.0    -      -       -      +
    196C  ARG*     1.3    57.5    +      -       -      +
    198C  GLY*     4.0     0.7    -      -       -      -
    199C  TYR*     3.1    27.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 196 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    192C  TYR*     3.0    44.4    +      -       +      +
    193C  SER*     3.9     6.5    -      -       -      +
    195C  LEU*     1.3    73.4    -      -       -      +
    197C  MET*     1.3    66.0    +      -       -      +
    199C  TYR*     3.2    43.4    +      -       -      +
    200C  GLU*     3.1    41.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 197 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83C  ALA*     4.2     8.7    -      -       +      +
     87C  SER*     4.0    14.8    -      -       -      -
     90C  ILE*     6.4     0.4    -      -       +      -
    145C  GLN*     3.4    41.1    -      -       -      +
    148C  ARG*     3.6    34.5    -      -       -      +
    149C  ALA*     3.7    30.1    -      -       +      -
    152C  LEU*     4.2    13.2    -      -       +      -
    193C  SER      3.1    19.6    +      -       -      +
    194C  ALA*     3.3     7.6    -      -       -      +
    196C  ARG*     1.3    74.2    -      -       -      +
    198C  GLY*     1.3    61.8    +      -       -      +
    200C  GLU*     3.2    13.0    +      -       -      +
    201C  ALA*     3.2    15.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 198 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84C  LEU*     4.3     4.3    -      -       -      -
     87C  SER*     3.2    24.7    -      -       -      -
    194C  ALA      2.9    12.9    +      -       -      -
    195C  LEU      4.0     1.3    -      -       -      -
    197C  MET*     1.3    73.0    -      -       -      +
    199C  TYR*     1.3    61.1    +      -       -      +
    201C  ALA*     2.8    24.7    +      -       -      +
    202C  VAL*     3.0    20.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 199 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    195C  LEU*     3.1    15.6    +      -       +      +
    196C  ARG*     3.2    43.3    +      -       -      +
    198C  GLY*     1.3    74.9    -      -       -      +
    200C  GLU*     1.3    65.8    +      -       +      +
    202C  VAL*     3.7    12.8    +      -       +      +
    203C  GLN*     3.1    59.9    +      -       +      +
    208C  ARG*     4.0    12.5    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 200 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145C  GLN*     3.7     4.7    -      -       -      +
    148C  ARG*     2.9    40.0    +      -       -      +
    196C  ARG*     3.1    37.6    +      -       +      +
    197C  MET*     3.5     9.3    -      -       -      +
    198C  GLY      3.1     0.2    -      -       -      -
    199C  TYR*     1.3    83.2    -      -       +      +
    201C  ALA*     1.3    56.3    +      -       -      +
    203C  GLN*     3.2     8.1    +      -       -      +
    204C  SER*     2.7    31.8    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 201 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80C  SER*     3.5    23.2    -      -       -      +
     83C  ALA*     3.9     9.2    -      -       +      -
     84C  LEU*     3.7    19.7    -      -       +      +
    145C  GLN*     3.6    11.6    +      -       -      +
    197C  MET      3.2    10.9    +      -       -      +
    198C  GLY*     2.8    11.9    +      -       -      +
    200C  GLU*     1.3    72.4    -      -       -      +
    202C  VAL*     1.3    61.8    +      -       -      +
    203C  GLN      3.0     4.3    -      -       -      -
    204C  SER*     3.0     6.4    +      -       -      -
    205C  LEU*     3.0    26.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 202 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81A  LEU*     3.9    18.6    -      -       +      -
     84C  LEU*     3.8    23.3    -      -       +      -
    198C  GLY      3.0    19.2    +      -       -      +
    199C  TYR*     3.8    15.0    -      -       +      +
    201C  ALA*     1.3    74.2    -      -       -      +
    203C  GLN*     1.3    62.6    +      -       -      +
    205C  LEU*     3.4    12.2    -      -       -      +
    206C  LEU*     2.7    49.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 203 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62A  TYR*     5.4     0.8    +      -       -      -
     71A  HIS*     2.7    36.6    +      -       -      -
    199C  TYR*     3.1    54.3    +      -       +      +
    200C  GLU*     3.4    10.1    -      -       -      +
    201C  ALA      3.0     0.4    -      -       -      -
    202C  VAL*     1.3    84.9    -      -       -      +
    204C  SER*     1.3    55.0    +      -       -      +
    206C  LEU*     2.9    27.2    -      -       -      +
    208C  ARG*     2.9    57.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 204 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77C  LYS*     3.5    21.9    -      -       -      +
     80C  SER*     3.7    14.4    -      -       -      -
    145C  GLN*     2.7    18.6    +      -       -      -
    200C  GLU      2.7    16.8    +      -       -      -
    201C  ALA      3.1     4.0    +      -       -      -
    203C  GLN*     1.3    71.0    -      -       -      +
    205C  LEU*     1.3    59.6    +      -       -      +
    206C  LEU      3.0    13.8    -      -       -      +
    207C  ASP*     3.9     2.4    -      -       -      +
    208C  ARG*     4.9     3.4    -      -       -      +
    238C  GLN*     4.4    15.2    -      -       -      +
    239C  SER*     6.3     0.2    -      -       -      -
    240C  GLY      6.2     0.9    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 205 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77A  LYS*     3.5    31.8    +      -       -      +
     81A  LEU*     3.8    27.1    -      -       +      -
    205A  LEU*     4.4    10.9    -      -       +      +
     77C  LYS*     4.0    21.2    +      -       +      +
     80C  SER*     3.8    25.8    -      -       -      +
     81C  LEU*     3.5    36.1    -      -       +      -
     84C  LEU*     4.0    20.9    -      -       +      -
    201C  ALA      3.0    16.2    +      -       -      +
    202C  VAL*     3.2     9.8    +      -       -      +
    204C  SER*     1.3    75.9    -      -       -      +
    206C  LEU*     1.3    64.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 206 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62A  TYR*     4.2    22.2    -      -       +      +
     71A  HIS*     4.1    17.9    -      -       +      +
     75A  HIS*     5.0     8.1    -      -       -      +
     77A  LYS*     4.1     6.7    -      -       +      -
     78A  ALA*     3.9    26.2    -      -       +      +
     81A  LEU*     3.5    25.8    -      -       +      -
    202C  VAL*     2.7    28.3    +      -       +      +
    203C  GLN*     2.9    41.4    -      -       -      +
    204C  SER      3.0    10.0    -      -       -      -
    205C  LEU*     1.3    70.6    -      -       -      +
    207C  ASP*     1.3    62.1    +      -       -      +
    208C  ARG      2.8     8.5    +      -       -      -
----------------------------------------------------------
 Back to top of page


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