Contacts of the helix formed by residues 152 - 178 (chain F) in PDB entry 4NFI


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 TYR 152 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84F  ARG*     3.2    31.9    +      -       -      +
    147F  CYS*     3.9    12.3    -      -       +      -
    150F  GLN*     3.0    27.3    +      -       +      -
    151F  PRO*     1.3    85.1    -      -       +      +
    153F  TYR*     1.3    66.2    +      -       -      +
    154F  LEU      3.4     2.2    -      -       -      -
    155F  ASN*     3.2    14.2    +      -       +      +
    156F  LEU*     3.0    48.3    +      -       +      +
    215F  TYR*     3.5    27.1    -      -       +      +
    216F  MET*     3.6    49.8    -      -       +      +
    218F  GLY*     5.6     0.4    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 153 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140F  TYR      4.9     1.2    +      -       -      -
    143F  LEU*     3.5    28.0    -      -       +      -
    144F  LYS*     3.5    26.2    +      -       -      +
    147F  CYS*     3.4    32.3    -      -       +      +
    148F  ARG*     3.6    37.8    +      -       +      +
    150F  GLN      3.1    11.0    +      -       -      +
    151F  PRO      3.4     1.0    -      -       -      -
    152F  TYR*     1.3    83.9    -      -       -      +
    154F  LEU*     1.3    66.8    +      -       +      +
    156F  LEU*     3.2     4.7    +      -       +      +
    157F  ILE*     3.0    50.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 154 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151F  PRO      5.1     2.1    +      -       -      +
    152F  TYR      3.4     0.2    -      -       -      -
    153F  TYR*     1.3    78.8    -      -       +      +
    155F  ASN*     1.3    68.9    +      -       -      +
    157F  ILE*     3.3    18.0    +      -       +      -
    158F  GLU*     2.9    52.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 155 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151F  PRO      4.8     3.9    +      -       -      -
    152F  TYR*     3.2    21.4    +      -       -      +
    154F  LEU*     1.3    79.1    -      -       -      +
    156F  LEU*     1.3    57.2    +      -       -      +
    158F  GLU*     3.8     9.1    -      -       -      +
    159F  LEU*     2.9    29.9    +      -       -      +
    215F  TYR*     3.4    48.2    +      -       +      +
    220F  ASP*     4.0    15.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 156 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88F  VAL*     3.9    26.5    -      -       +      -
    143F  LEU*     3.9    21.3    -      -       +      -
    147F  CYS*     4.5     3.6    -      -       +      -
    152F  TYR*     3.0    44.2    +      -       +      +
    153F  TYR*     3.2     7.2    +      -       +      +
    155F  ASN*     1.3    74.5    -      -       -      +
    157F  ILE*     1.3    67.4    +      -       -      +
    159F  LEU*     3.2     7.0    +      -       +      +
    160F  PHE*     2.9    34.6    +      -       +      -
    212F  ALA*     3.8    43.3    -      -       +      +
    215F  TYR*     4.3     9.4    -      -       +      -
    216F  MET*     4.3     2.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 157 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140F  TYR*     4.0    13.6    -      -       +      -
    143F  LEU*     4.2    16.8    -      -       +      -
    153F  TYR*     3.0    63.0    +      -       +      +
    154F  LEU*     3.7    19.7    -      -       +      +
    156F  LEU*     1.3    75.9    -      -       -      +
    158F  GLU*     1.3    65.0    +      -       +      +
    160F  PHE*     3.3     2.3    +      -       -      +
    161F  LEU*     3.0    45.0    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 158 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    154F  LEU*     2.9    47.7    +      -       +      +
    155F  ASN*     4.0     9.4    -      -       -      +
    157F  ILE*     1.3    75.7    -      -       +      +
    159F  LEU*     1.3    60.1    +      -       -      +
    161F  LEU*     3.9     9.1    -      -       +      +
    162F  GLN*     2.8    33.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 159 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155F  ASN      2.9    18.7    +      -       -      +
    156F  LEU*     3.2     8.5    +      -       +      +
    158F  GLU*     1.3    77.9    -      -       -      +
    160F  PHE*     1.3    54.1    +      -       +      +
    162F  GLN*     4.0     4.6    -      -       +      +
    163F  SER*     2.7    47.0    +      -       -      +
    207F  TYR*     3.7    31.6    -      -       +      +
    208F  LEU*     3.6    21.5    -      -       +      +
    211F  ALA*     3.9     7.2    -      -       +      -
    212F  ALA*     3.5    38.1    -      -       +      +
    215F  TYR*     4.0    15.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 160 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88F  VAL*     4.2    17.7    -      -       +      -
     91F  CYS*     3.7    43.5    -      -       +      -
     92F  VAL*     3.7    24.5    -      -       +      -
     95F  LEU*     4.7     7.0    -      -       +      +
    139F  ILE*     3.7    21.3    -      -       +      -
    140F  TYR*     3.3    20.9    -      -       +      +
    143F  LEU*     4.2    12.6    -      -       +      -
    156F  LEU*     2.9    32.8    +      -       +      +
    157F  ILE      3.8     2.7    -      -       -      +
    159F  LEU*     1.3    77.4    -      -       +      +
    161F  LEU*     1.3    61.1    +      -       -      +
    163F  SER*     3.4     5.1    +      -       -      -
    164F  SER*     2.8    29.8    +      -       -      -
    208F  LEU*     4.2    24.0    -      -       +      -
    212F  ALA*     4.8     6.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 161 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136F  GLU*     5.7     3.1    -      -       -      +
    140F  TYR*     3.3    27.4    -      -       +      +
    157F  ILE*     3.0    40.3    +      -       +      +
    158F  GLU*     3.9     8.5    -      -       +      +
    160F  PHE*     1.3    74.2    -      -       -      +
    162F  GLN*     1.3    64.1    +      -       -      +
    164F  SER*     3.3     6.7    +      -       -      -
    165F  TYR*     3.0    22.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 162 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158F  GLU      2.8    18.7    +      -       -      +
    159F  LEU*     4.1     5.2    -      -       +      +
    161F  LEU*     1.3    78.6    -      -       -      +
    163F  SER*     1.3    56.8    +      -       -      +
    165F  TYR*     3.3    24.0    +      -       -      +
    166F  GLN*     3.0    58.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 163 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95F  LEU*     5.1     0.9    -      -       -      -
     99F  PHE*     5.3     0.7    -      -       -      -
    159F  LEU*     2.7    36.9    +      -       -      +
    160F  PHE      3.8     3.6    -      -       -      -
    162F  GLN*     1.3    77.2    -      -       -      +
    164F  SER*     1.3    53.5    +      -       -      +
    166F  GLN*     3.4    14.7    +      -       -      +
    167F  THR*     2.6    38.7    +      -       -      -
    203F  PHE*     4.8     2.6    +      -       -      +
    204F  TYR*     4.6     9.4    -      -       -      +
    207F  TYR*     5.1     2.4    -      -       -      -
    208F  LEU*     3.8    31.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 164 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95F  LEU*     3.5    23.3    -      -       -      +
     99F  PHE*     4.3    12.3    -      -       -      -
    136F  GLU*     4.5    11.5    +      -       -      -
    140F  TYR*     4.3     4.7    +      -       -      -
    160F  PHE      2.8    18.4    +      -       -      -
    161F  LEU*     3.5     7.9    -      -       -      -
    163F  SER*     1.3    73.7    -      -       -      +
    165F  TYR*     1.3    66.5    +      -       -      +
    167F  THR*     3.4     1.7    +      -       -      -
    168F  GLU*     2.9    43.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 165 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    161F  LEU      3.0    13.3    +      -       -      +
    162F  GLN*     3.6    31.9    -      -       -      +
    164F  SER*     1.3    77.9    -      -       -      +
    166F  GLN*     1.3    62.9    +      -       +      +
    168F  GLU*     3.3    11.0    +      -       +      +
    169F  ILE*     2.8    61.9    +      -       +      +
    199F  TYR*     6.4     1.3    -      +       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 166 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162F  GLN*     3.0    50.8    +      -       -      +
    163F  SER*     3.4    16.4    +      -       -      +
    165F  TYR*     1.3    82.4    -      -       +      +
    167F  THR*     1.3    58.1    +      -       -      +
    169F  ILE*     3.2     5.0    +      -       -      +
    170F  GLY      2.9    23.9    +      -       -      -
    199F  TYR*     3.2    24.3    -      -       +      +
    203F  PHE*     3.3    61.1    -      -       +      +
    207F  TYR*     5.7     1.2    -      -       -      -
    229F  LYS*     5.2     4.9    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 167 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99F  PHE*     3.6    20.2    -      -       +      -
    163F  SER      2.6    21.2    +      -       -      -
    164F  SER      3.7     4.3    -      -       -      -
    166F  GLN*     1.3    79.3    -      -       -      +
    168F  GLU*     1.3    55.8    +      -       -      +
    170F  GLY*     3.3     2.4    +      -       -      -
    171F  GLN*     2.9    26.9    +      -       -      +
    199F  TYR      3.2     9.8    +      -       -      -
    200F  LYS*     3.4    22.7    -      -       -      +
    204F  TYR*     3.4    23.7    +      -       +      +
    401F  JD5      3.6    25.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 168 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98F  PHE*     3.9    27.7    -      -       -      -
     99F  PHE*     4.5     2.3    -      -       +      -
    136F  GLU*     4.6     3.3    -      -       -      +
    164F  SER*     2.9    32.2    +      -       -      +
    165F  TYR*     3.7     9.7    -      -       +      +
    167F  THR*     1.3    72.1    -      -       -      +
    169F  ILE*     1.3    66.2    +      -       -      +
    171F  GLN*     3.4     7.8    +      -       -      +
    172F  THR*     3.0    25.9    +      -       -      -
    401F  JD5      4.1    23.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 169 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    165F  TYR*     2.8    57.2    +      -       +      +
    166F  GLN*     3.5     8.3    -      -       -      +
    168F  GLU*     1.3    75.7    -      -       +      +
    170F  GLY*     1.3    64.1    +      -       -      +
    172F  THR*     3.1    12.6    +      -       +      +
    173F  LEU*     3.1    29.5    +      -       +      +
    199F  TYR*     4.1    22.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 170 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166F  GLN      2.9    10.5    +      -       -      -
    167F  THR      3.6     4.3    -      -       -      -
    169F  ILE*     1.3    78.6    -      -       -      +
    171F  GLN*     1.3    55.6    +      -       -      +
    173F  LEU*     3.1     9.8    +      -       -      +
    174F  ASP*     2.9    26.9    +      -       -      +
    196F  ILE*     4.1     4.7    -      -       -      +
    199F  TYR*     3.4    23.3    -      -       -      -
    200F  LYS*     3.6    15.3    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 171 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103F  ASP*     3.7    17.5    +      -       -      +
    106F  MET*     3.9    13.0    -      -       +      +
    107F  ASP*     4.8     0.4    +      -       -      -
    167F  THR      2.9    17.4    +      -       -      +
    168F  GLU*     3.7     9.2    -      -       -      +
    170F  GLY*     1.3    74.9    -      -       -      +
    172F  THR*     1.3    60.8    +      -       -      +
    174F  ASP*     3.3    12.3    +      -       -      +
    175F  LEU*     3.0    62.6    +      -       +      +
    200F  LYS*     3.8     5.5    -      -       +      +
    401F  JD5      3.3    51.0    -      -       +      +
    402F   MG      4.1     6.5    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 172 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    168F  GLU      3.0    16.1    +      -       -      -
    169F  ILE*     3.1    16.2    +      -       +      +
    171F  GLN*     1.3    74.4    -      -       -      +
    173F  LEU*     1.3    60.0    +      -       +      +
    175F  LEU*     3.3     7.2    +      -       -      +
    176F  LEU*     2.9    53.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 173 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169F  ILE*     3.1    28.4    +      -       +      +
    170F  GLY*     3.1     8.9    +      -       -      +
    172F  THR*     1.3    78.9    -      -       +      +
    174F  ASP*     1.3    61.5    +      -       -      +
    176F  LEU*     3.8    10.9    -      -       +      +
    177F  THR*     2.7    32.2    +      -       -      -
    192F  ARG*     3.9    28.9    -      -       -      +
    195F  SER*     4.1    33.9    -      -       -      +
    196F  ILE*     3.8    16.2    -      -       +      +
    199F  TYR*     4.9     6.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 174 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170F  GLY      2.9    13.0    +      -       -      +
    171F  GLN*     3.4    21.5    +      -       -      +
    173F  LEU*     1.3    78.0    -      -       -      +
    175F  LEU*     1.3    69.7    +      -       -      +
    177F  THR*     3.5     2.3    +      -       -      -
    178F  ALA*     3.3    23.7    +      -       -      +
    196F  ILE*     4.1    19.2    -      -       +      +
    200F  LYS*     2.9    30.3    +      -       +      -
    266F  LYS*     3.3    34.7    +      -       -      +
    267F  CYS*     5.6     1.1    +      -       -      +
    401F  JD5      4.3     1.0    +      -       -      -
    402F   MG      4.1     6.2    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 175 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106F  MET*     3.8    33.7    -      -       +      +
    107F  ASP*     4.6     6.5    -      -       -      +
    171F  GLN*     3.0    47.0    +      -       +      +
    172F  THR*     3.9     6.1    -      -       -      +
    174F  ASP*     1.3    86.8    -      -       -      +
    176F  LEU*     1.3    64.4    +      -       +      +
    178F  ALA*     3.3    22.7    +      -       +      +
    179F  PRO*     3.6     3.8    -      -       -      +
    266F  LYS*     4.8     5.4    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 176 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172F  THR*     2.9    45.7    +      -       +      +
    173F  LEU*     3.8    11.7    -      -       +      +
    175F  LEU*     1.3    75.2    -      -       +      +
    177F  THR*     1.3    58.6    +      -       -      +
    178F  ALA      3.1     6.0    +      -       -      -
    179F  PRO*     3.5    14.2    -      -       -      +
    187F  ARG*     4.8     4.2    -      -       -      -
    192F  ARG*     4.5    12.8    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 177 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    173F  LEU      2.7    21.3    +      -       -      -
    174F  ASP      4.2     2.5    -      -       -      -
    175F  LEU      3.3     0.2    -      -       -      -
    176F  LEU*     1.3    75.3    -      -       -      +
    178F  ALA*     1.3    58.8    +      -       -      +
    179F  PRO*     3.4     7.7    -      -       -      +
    187F  ARG*     4.0    20.8    +      -       +      +
    188F  PHE*     3.3    27.0    -      -       +      -
    192F  ARG*     2.9    44.5    +      -       +      +
    196F  ILE*     3.8     7.9    -      -       -      +
    267F  CYS*     3.7    24.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 178 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174F  ASP      3.3    17.7    +      -       -      +
    175F  LEU*     3.4     9.0    -      -       -      +
    176F  LEU      3.1     0.2    -      -       -      -
    177F  THR*     1.3    78.7    -      -       -      +
    179F  PRO*     1.3    68.2    -      -       -      +
    180F  GLN      3.2     3.1    +      -       -      -
    264F  ASP      3.6     9.3    -      -       -      +
    265F  ASN*     3.2    24.7    -      -       -      +
    266F  LYS*     3.6    29.5    -      -       +      -
    267F  CYS      4.8     0.7    -      -       -      +
----------------------------------------------------------
 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