Contacts of the helix formed by residues 150 - 176 (chain F) in PDB entry 1NU9


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 THR 150 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148F  PRO      4.0     0.8    +      -       -      +
    149F  PHE*     1.3    79.3    -      -       -      +
    151F  ASP*     1.3    65.0    +      -       -      +
    152F  GLU*     3.7     6.9    +      -       -      +
    153F  MET*     3.2    29.7    +      -       +      +
    154F  GLU*     2.9    17.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 151 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149F  PHE      3.9     0.9    +      -       -      +
    150F  THR*     1.3    72.7    -      -       -      +
    152F  GLU*     1.3    58.5    +      -       -      +
    154F  GLU*     3.3    15.5    +      -       -      +
    155F  GLU*     2.9    30.1    +      -       -      +
    204F  ARG*     4.9     5.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 152 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150F  THR*     3.2     7.0    +      -       -      +
    151F  ASP*     1.3    79.1    -      -       -      +
    153F  MET*     1.3    80.4    +      -       +      +
    155F  GLU*     3.1    11.3    +      -       +      +
    156F  LYS*     3.1    47.1    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 153 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149F  PHE*     3.6    30.9    -      -       +      -
    150F  THR*     3.2    22.3    +      -       +      +
    152F  GLU*     1.3    97.3    -      -       +      +
    154F  GLU*     1.3    56.4    +      -       -      +
    156F  LYS*     3.4    24.1    +      -       +      +
    157F  ALA*     3.0    29.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 154 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149F  PHE*     3.5    22.2    -      -       +      +
    150F  THR      2.9    15.8    +      -       -      +
    151F  ASP*     3.7    12.8    -      -       -      +
    153F  MET*     1.3    73.6    -      -       -      +
    155F  GLU*     1.3    60.1    +      -       -      +
    157F  ALA*     3.9     0.5    -      -       -      +
    158F  THR*     2.7    44.9    +      -       -      +
    204F  ARG*     2.9    56.1    +      -       -      +
    205F  ILE      3.3    17.7    +      -       -      +
    206F  SER*     4.4     8.9    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 155 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151F  ASP      2.9    17.7    +      -       -      +
    152F  GLU*     3.1    10.5    +      -       -      +
    154F  GLU*     1.3    77.2    -      -       -      +
    156F  LYS*     1.3    60.2    -      -       +      +
    158F  THR*     3.8     5.3    -      -       -      -
    159F  ALA*     3.0    28.4    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 156 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152F  GLU*     3.1    38.5    +      -       +      +
    153F  MET*     3.7    27.1    -      -       +      +
    155F  GLU*     1.3    75.9    -      -       +      +
    157F  ALA*     1.3    66.6    +      -       -      +
    159F  ALA*     3.0    16.7    +      -       -      +
    160F  ARG*     3.2    18.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 157 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149F  PHE*     3.6    20.0    -      -       +      -
    153F  MET      3.0    18.4    +      -       -      +
    154F  GLU      3.9     2.5    -      -       -      +
    156F  LYS*     1.3    75.5    -      -       -      +
    158F  THR*     1.3    64.1    +      -       -      +
    160F  ARG*     3.2     6.5    +      -       -      +
    161F  VAL*     3.1    24.3    +      -       -      +
    205F  ILE*     3.9     8.5    -      -       +      -
    211F  GLU*     3.5    36.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 158 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    154F  GLU*     2.7    37.6    +      -       -      +
    155F  GLU*     3.8     6.1    -      -       -      -
    157F  ALA*     1.3    71.8    -      -       -      +
    159F  ALA*     1.3    56.7    +      -       -      +
    161F  VAL*     3.3     1.6    +      -       -      +
    162F  ASP*     2.9    45.0    +      -       -      +
    204F  ARG*     5.4     1.4    -      -       -      -
    205F  ILE*     3.4    33.0    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 159 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155F  GLU*     3.0    14.3    +      -       +      +
    156F  LYS*     3.0    12.1    +      -       -      +
    158F  THR*     1.3    74.3    -      -       -      +
    160F  ARG*     1.3    61.5    +      -       +      +
    162F  ASP*     4.0     6.3    -      -       -      +
    163F  ASP*     2.9    30.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 160 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156F  LYS*     3.2    15.0    +      -       +      +
    157F  ALA*     3.6     4.9    -      -       -      +
    159F  ALA*     1.3    77.4    -      -       +      +
    161F  VAL*     1.3    63.0    +      -       -      +
    163F  ASP*     3.3     6.7    +      -       -      +
    164F  LEU*     3.1    24.1    +      -       -      +
    211F  GLU*     2.7    38.0    +      -       -      +
    215F  ILE*     3.8    38.2    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 161 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    157F  ALA      3.1    12.4    +      -       -      +
    158F  THR      3.6     7.6    -      -       -      +
    160F  ARG*     1.3    81.9    -      -       -      +
    162F  ASP*     1.3    71.2    +      -       -      +
    164F  LEU      3.4     0.2    +      -       -      -
    165F  ALA*     3.0    18.7    +      -       -      +
    196F  LEU*     4.0    16.2    -      -       +      -
    205F  ILE*     4.0    26.7    -      -       +      -
    211F  GLU*     4.5     2.2    -      -       +      +
    214F  MET*     3.7    35.4    -      -       +      -
    215F  ILE*     3.7    24.7    -      -       +      -
    218F  LEU*     3.5     8.3    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 162 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158F  THR*     2.9    36.0    +      -       -      +
    159F  ALA*     4.0     6.0    -      -       -      +
    161F  VAL*     1.3    82.7    -      -       -      +
    163F  ASP*     1.3    60.5    +      -       -      +
    165F  ALA*     3.3     6.2    +      -       -      +
    166F  ASN*     2.9    42.3    +      -       -      +
    196F  LEU*     4.8    10.7    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 163 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159F  ALA      2.9    19.1    +      -       -      +
    160F  ARG*     3.6     7.4    -      -       -      +
    161F  VAL      3.2     0.2    -      -       -      -
    162F  ASP*     1.3    76.1    -      -       -      +
    164F  LEU*     1.3    63.2    +      -       -      +
    166F  ASN*     3.0    18.9    +      -       -      +
    167F  LYS*     3.0    27.0    +      -       -      +
    239F  SER*     2.6    32.5    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 164 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160F  ARG      3.1    10.3    +      -       -      +
    161F  VAL      3.7     7.6    -      -       -      +
    163F  ASP*     1.3    79.1    +      -       -      +
    165F  ALA*     1.3    65.1    +      -       -      +
    167F  LYS*     2.9    22.4    +      -       +      +
    168F  ALA*     3.0    10.8    +      -       -      +
    215F  ILE*     3.6    31.2    -      -       +      +
    218F  LEU*     3.5    28.7    -      -       +      -
    219F  GLU*     3.7    16.4    -      -       +      +
    222F  ILE*     3.5    24.9    -      -       +      -
   2004F  IMD      4.3    16.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 165 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    161F  VAL      3.0    17.2    +      -       -      +
    162F  ASP*     3.6     6.7    -      -       -      +
    164F  LEU*     1.3    77.6    -      -       -      +
    166F  ASN*     1.3    57.7    +      -       -      +
    168F  ALA*     3.0    10.4    +      -       -      +
    169F  TYR*     2.8    35.7    +      -       +      -
    192F  VAL*     4.0     7.1    -      -       +      +
    196F  LEU*     3.7    31.2    -      -       +      -
    218F  LEU*     3.8    14.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 166 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162F  ASP*     2.9    29.6    +      -       -      +
    163F  ASP*     3.0    12.9    +      -       -      +
    165F  ALA*     1.3    75.1    -      -       -      +
    167F  LYS*     1.3    61.5    +      -       -      +
    169F  TYR*     3.3    17.1    +      -       -      -
    170F  SER      3.1    14.2    +      -       -      -
    239F  SER*     4.0     5.6    -      -       -      -
    240F  TYR*     2.9    55.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 167 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163F  ASP*     3.0    25.7    +      -       -      +
    164F  LEU*     2.9    19.5    +      -       +      +
    166F  ASN*     1.3    74.2    -      -       -      +
    168F  ALA*     1.3    66.8    +      -       -      +
    170F  SER*     3.1    13.2    +      -       -      -
    171F  VAL*     3.1    13.1    +      -       -      +
    222F  ILE*     5.0     1.6    -      -       +      -
    237F  ILE*     2.9    47.6    +      -       +      +
    238F  THR*     4.7     0.2    -      -       -      +
    239F  SER*     2.6    37.9    +      -       -      +
   2004F  IMD      4.0    24.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 168 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    164F  LEU      3.0     8.6    +      -       -      +
    165F  ALA*     3.0    13.2    +      -       -      +
    167F  LYS*     1.3    78.3    -      -       -      +
    169F  TYR*     1.3    57.1    +      -       -      +
    171F  VAL*     3.2     8.4    +      -       -      +
    172F  TYR*     2.9    27.3    +      -       -      +
    188F  LEU*     3.6     8.4    -      -       +      +
    192F  VAL*     3.6    28.0    -      -       +      -
    218F  LEU*     5.5     1.8    -      -       +      -
    222F  ILE*     3.8    27.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 169 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    165F  ALA*     2.8    22.9    +      -       +      -
    166F  ASN*     3.7    23.6    -      -       -      +
    167F  LYS      3.2     0.6    -      -       -      -
    168F  ALA*     1.3    78.0    -      -       -      +
    170F  SER*     1.3    56.0    +      -       -      +
    172F  TYR*     3.2     8.8    +      +       +      +
    173F  PHE*     2.8    46.2    +      +       +      -
    189F  LYS*     3.8    31.4    -      -       +      -
    192F  VAL*     3.5    30.0    -      -       +      +
    193F  ASP*     2.3    33.1    +      -       -      -
    196F  LEU*     3.7    18.3    -      -       +      +
    199F  GLU*     5.3     6.8    +      -       -      +
    240F  TYR*     4.2    13.9    -      +       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 170 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166F  ASN      3.1     4.0    +      -       -      -
    167F  LYS      3.1    11.1    +      -       -      -
    169F  TYR*     1.3    73.4    -      -       -      +
    171F  VAL*     1.3    67.5    +      -       -      +
    173F  PHE*     3.0     5.3    +      -       -      +
    174F  ALA*     2.8    24.1    +      -       -      +
    237F  ILE*     3.8     9.6    -      -       -      -
    238F  THR      2.6    27.0    +      -       -      -
    240F  TYR*     3.2    15.1    +      -       -      +
    257F  LEU*     3.5    30.8    -      -       -      +
    258F  VAL*     5.7     0.3    -      -       -      +
    261F  THR*     4.3     4.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 171 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167F  LYS      3.1    12.4    +      -       -      +
    168F  ALA*     3.2     9.2    +      -       -      +
    170F  SER*     1.3    75.9    -      -       -      +
    172F  TYR*     1.3    64.6    +      -       -      +
    174F  ALA*     3.1     8.7    +      -       -      -
    175F  PHE*     3.3    19.9    +      -       +      +
    188F  LEU*     3.8     9.2    -      -       +      -
    222F  ILE*     5.1     4.3    -      -       +      -
    225F  PHE*     3.6    37.9    -      -       +      -
    226F  PHE*     4.0    17.3    -      -       +      -
    234F  PRO*     5.9     0.4    -      -       +      -
    237F  ILE*     3.8    28.3    -      -       +      -
    261F  THR*     4.2    13.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 172 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    168F  ALA      2.9    14.0    +      -       -      +
    169F  TYR*     3.3    17.0    -      +       +      +
    170F  SER      3.1     0.2    -      -       -      -
    171F  VAL*     1.3    79.5    -      -       -      +
    173F  PHE*     1.3   104.7    +      +       -      +
    175F  PHE      3.2     0.3    +      -       -      -
    176F  VAL*     3.0    54.0    +      -       +      +
    185F  ALA*     3.2    27.6    -      -       -      +
    186F  LEU*     4.2    12.9    -      -       +      +
    188F  LEU*     3.6    15.9    -      -       +      +
    189F  LYS*     3.6    44.2    +      -       +      +
   2002F  IMD      4.5    10.2    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 173 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169F  TYR*     2.8    34.2    +      +       +      +
    170F  SER*     3.6     5.8    -      -       -      +
    172F  TYR*     1.3   103.1    -      +       -      +
    174F  ALA*     1.3    61.9    +      -       -      +
    175F  PHE      3.3     0.9    +      -       -      -
    176F  VAL*     3.6    14.5    +      -       +      +
    177F  ARG*     4.5     4.9    -      -       -      -
    189F  LYS*     6.4     0.2    -      -       -      -
    240F  TYR*     3.4    52.3    -      +       -      -
    247F  TYR*     5.7     6.3    -      +       +      -
    254F  PHE*     3.7    33.5    -      +       +      -
    257F  LEU*     5.1     4.0    -      -       +      -
    258F  VAL*     3.8    14.8    -      -       +      +
   2002F  IMD      4.4    18.6    -      +       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 174 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170F  SER      2.8    15.8    +      -       -      +
    171F  VAL      3.1     5.8    +      -       -      +
    173F  PHE*     1.3    76.9    -      -       -      +
    175F  PHE*     1.3    70.6    +      -       +      +
    177F  ARG*     5.3     1.1    +      -       -      -
    178F  ASP      5.5     0.2    +      -       -      -
    258F  VAL*     3.8    22.1    -      -       +      +
    261F  THR*     3.6    30.3    -      -       +      -
    262F  ARG*     3.1    28.7    +      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 175 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171F  VAL*     3.3    20.4    -      -       +      +
    172F  TYR      3.2     2.6    +      -       -      -
    174F  ALA*     1.3    90.5    -      -       +      +
    176F  VAL*     1.3    61.9    +      -       -      +
    177F  ARG      3.1     3.6    -      -       -      +
    178F  ASP*     3.0    46.7    +      -       -      +
    181F  HIS*     4.2    13.7    -      +       +      -
    182F  LYS*     3.7     8.1    +      -       -      -
    185F  ALA*     3.8     8.1    -      -       +      -
    225F  PHE*     3.7    30.3    -      +       +      -
    231F  LEU*     3.7    22.9    -      -       +      -
    261F  THR*     4.8     1.8    -      -       +      -
    262F  ARG*     3.8    28.5    -      -       +      -
    265F  VAL*     3.9    35.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 176 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172F  TYR*     3.0    45.5    +      -       +      +
    173F  PHE*     3.6    20.9    -      -       -      +
    175F  PHE*     1.3    77.4    -      -       -      +
    177F  ARG*     1.3    73.7    +      -       +      +
    178F  ASP      3.4     0.2    -      -       -      -
    182F  LYS*     3.8    27.5    +      -       +      +
    185F  ALA*     3.8     7.2    -      -       -      +
    186F  LEU*     3.9    20.4    -      -       +      -
    254F  PHE*     5.7     0.2    -      -       +      -
   2002F  IMD      4.4    19.5    -      -       +      -
----------------------------------------------------------
 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