Contacts of the helix formed by residues 154 - 179 (chain D) in PDB entry 2VT4


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 154 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75D  LEU*     3.4    14.9    -      -       -      +
    150D  GLN      5.7     1.1    -      -       -      +
    151D  SER      5.0     5.4    -      -       -      +
    152D  LEU      3.4    11.9    +      -       -      +
    153D  MET*     1.3    79.9    -      -       -      +
    155D  ARG*     1.3    60.1    +      -       -      +
    156D  ALA*     3.6     8.1    +      -       -      +
    157D  ARG*     3.2    32.2    +      -       -      +
    158D  ALA*     3.0    21.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 155 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73D  GLN*     2.9    37.8    +      -       -      +
     74D  THR*     3.9    14.5    -      -       -      +
     75D  LEU*     4.1    12.8    -      -       +      +
     78D  LEU*     4.0    23.8    -      -       +      +
    154D  THR*     1.3    72.9    -      -       -      +
    156D  ALA*     1.3    64.7    +      -       -      +
    157D  ARG      3.2     0.2    -      -       -      -
    158D  ALA*     3.8     1.2    -      -       -      +
    159D  LYS*     3.1    37.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 156 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    154D  THR*     3.6     7.0    +      -       -      +
    155D  ARG*     1.3    78.0    -      -       -      +
    157D  ARG*     1.3    62.0    +      -       -      +
    159D  LYS*     3.4    10.1    +      -       -      +
    160D  VAL*     3.2    24.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 157 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205C  ARG*     5.1    10.3    -      -       -      +
    151D  SER      4.3     4.4    +      -       -      -
    152D  LEU*     2.7    57.8    +      -       -      +
    153D  MET*     4.7     7.4    -      -       -      +
    154D  THR*     3.2    26.6    +      -       -      +
    155D  ARG      3.2     0.4    -      -       -      -
    156D  ALA*     1.3    78.3    -      -       -      +
    158D  ALA*     1.3    65.6    +      -       -      +
    160D  VAL*     3.0    13.1    +      -       +      +
    161D  ILE*     3.0    28.4    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 158 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75D  LEU*     4.2     9.2    -      -       +      +
     78D  LEU*     4.1    18.8    -      -       +      -
     79D  PHE*     4.0    22.1    -      -       +      -
    153D  MET*     4.5     4.2    -      -       -      -
    154D  THR      3.0    17.4    +      -       -      +
    155D  ARG      3.8     4.5    -      -       -      +
    157D  ARG*     1.3    76.2    -      -       -      +
    159D  LYS*     1.3    57.6    +      -       -      +
    161D  ILE*     3.1    15.9    +      -       -      +
    162D  ILE*     2.8    32.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 159 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78D  LEU*     4.5    24.9    -      -       +      -
    155D  ARG*     3.1    27.3    +      -       -      +
    156D  ALA*     3.6     9.2    -      -       -      +
    158D  ALA*     1.3    73.6    -      -       -      +
    160D  VAL*     1.3    65.8    +      -       +      +
    162D  ILE*     3.2    15.1    +      -       +      +
    163D  CYS*     3.0    32.4    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 160 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    206C  ALA*     4.0    27.1    -      -       +      +
    402C  SOG      4.8    20.5    -      -       -      +
    156D  ALA      3.2    11.6    +      -       -      +
    157D  ARG*     3.0    15.5    +      -       +      +
    159D  LYS*     1.3    79.2    -      -       -      +
    161D  ILE*     1.3    61.0    +      -       +      +
    163D  CYS*     3.2     5.5    +      -       -      +
    164D  THR*     2.9    31.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 161 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79D  PHE*     4.6     6.7    -      -       +      -
    134D  VAL*     4.0    34.8    -      -       +      -
    153D  MET*     4.0    27.6    -      -       +      -
    157D  ARG*     3.0    24.3    +      -       +      +
    158D  ALA*     3.1    15.7    +      -       -      +
    160D  VAL*     1.3    78.9    -      -       +      +
    162D  ILE*     1.3    61.7    +      -       -      +
    164D  THR*     3.5     7.2    +      -       -      -
    165D  VAL*     3.1    24.0    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 162 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78D  LEU*     3.6    38.6    -      -       +      +
     79D  PHE*     4.0    17.7    -      -       +      -
     82D  SER*     3.6    27.6    -      -       -      +
    131D  THR*     6.2     0.2    -      -       +      -
    158D  ALA      2.8    20.7    +      -       -      +
    159D  LYS*     3.5    20.0    -      -       +      +
    161D  ILE*     1.3    71.4    -      -       -      +
    163D  CYS*     1.3    64.9    +      -       -      +
    165D  VAL*     3.2     8.3    +      -       -      +
    166D  TRP*     3.0    40.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with CYS 163 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    402C  SOG      3.0    43.2    +      -       -      +
    159D  LYS*     3.0    24.0    +      -       -      +
    160D  VAL*     3.7     4.0    -      -       -      +
    162D  ILE*     1.3    80.1    -      -       -      +
    164D  THR*     1.3    58.1    +      -       -      +
    166D  TRP*     3.7     7.1    -      -       -      +
    167D  ALA*     2.7    36.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 164 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    206C  ALA*     3.4    27.1    -      -       +      +
    210C  ALA*     3.9    28.7    -      -       +      -
    402C  SOG      4.1    17.3    -      -       +      -
    160D  VAL*     2.9    18.6    +      -       -      +
    161D  ILE*     3.7     8.7    -      -       -      -
    163D  CYS*     1.3    75.5    -      -       -      +
    165D  VAL*     1.3    58.3    +      -       +      +
    167D  ALA*     3.4     5.5    +      -       -      +
    168D  ILE*     2.9    40.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 165 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    406C  D10      6.3     2.7    -      -       +      -
     82D  SER*     5.7     0.2    -      -       -      +
    127D  ALA*     4.2     4.9    -      -       +      +
    130D  GLU*     3.4    33.1    -      -       +      +
    131D  THR*     3.8    22.0    -      -       -      +
    134D  VAL*     3.8    28.0    -      -       +      -
    161D  ILE*     3.1    17.9    +      -       +      +
    162D  ILE*     3.3    12.1    -      -       -      +
    164D  THR*     1.3    78.1    -      -       +      +
    166D  TRP*     1.3    61.0    +      -       +      +
    168D  ILE*     4.7     4.9    -      -       +      -
    169D  SER*     2.8    34.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TRP 166 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82D  SER*     3.0    32.3    +      -       -      +
     85D  CYS*     4.5     8.3    -      -       +      -
     86D  ALA*     3.8    35.9    -      -       +      -
     89D  VAL*     5.4     6.3    -      -       +      -
    123D  LEU*     3.9    36.7    -      -       +      +
    124D  CYS*     5.1     5.8    -      -       -      -
    127D  ALA*     4.0    27.7    -      -       +      +
    131D  THR*     5.0     1.0    +      -       -      -
    162D  ILE*     3.0    37.3    +      -       +      +
    163D  CYS*     3.2     7.1    +      -       -      +
    165D  VAL*     1.3    75.7    -      -       +      +
    167D  ALA*     1.3    59.9    +      -       -      +
    169D  SER*     3.2     5.3    +      -       -      -
    170D  ALA*     2.9    29.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 167 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181C  TRP*     3.9    26.1    -      -       +      -
    402C  SOG      4.3    20.2    -      -       +      +
    163D  CYS      2.7    21.7    +      -       -      +
    164D  THR*     3.5     5.4    -      -       -      +
    166D  TRP*     1.3    69.4    -      -       -      +
    168D  ILE*     1.3    66.6    +      -       -      +
    169D  SER      3.1     0.2    +      -       -      -
    170D  ALA*     3.2     6.7    +      -       -      +
    171D  LEU*     3.0    22.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 168 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181C  TRP*     5.2     0.9    -      -       -      -
    210C  ALA*     3.8    20.6    -      -       +      -
    214C  ILE*     3.7    33.7    -      -       +      -
    402C  SOG      4.1    18.6    -      -       +      -
    406C  D10      5.3    10.1    -      -       +      -
    130D  GLU*     3.8    21.3    -      -       -      +
    164D  THR*     2.9    31.3    +      -       +      +
    165D  VAL*     3.8     8.1    -      -       +      +
    167D  ALA*     1.3    71.3    -      -       -      +
    169D  SER*     1.3    62.4    +      -       -      +
    171D  LEU*     3.2    13.4    -      -       +      +
    172D  VAL*     3.2    31.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 169 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123D  LEU*     3.8    13.0    -      -       -      -
    126D  THR*     3.7    18.0    -      -       -      +
    127D  ALA*     3.4    26.0    +      -       -      -
    130D  GLU*     3.3    11.7    +      -       -      -
    165D  VAL      2.8    22.1    +      -       -      -
    166D  TRP*     3.4     8.5    -      -       -      -
    167D  ALA      3.0     0.2    -      -       -      -
    168D  ILE*     1.3    79.3    -      -       -      +
    170D  ALA*     1.3    55.8    +      -       -      +
    172D  VAL*     3.5     2.9    +      -       -      +
    173D  SER*     2.6    34.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 170 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181C  TRP*     5.7     2.7    -      -       +      -
    123D  LEU*     3.5     6.1    -      -       +      +
    166D  TRP      2.9    18.7    +      -       -      +
    167D  ALA*     3.8     4.9    -      -       -      +
    169D  SER*     1.3    69.3    -      -       -      +
    171D  LEU*     1.3    63.1    +      -       -      +
    173D  SER*     3.5     7.0    -      -       -      -
    174D  PHE*     2.8    59.5    +      -       +      +
    175D  LEU*     3.4     2.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 171 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171C  LEU*     3.5    36.5    -      -       +      +
    172C  VAL*     4.3    11.0    -      -       +      -
    175C  LEU*     4.8     4.3    -      -       +      -
    176C  PRO*     3.9    19.7    -      -       +      -
    179C  MET*     5.0     1.8    -      -       -      -
    181C  TRP*     4.4    17.1    -      -       +      -
    214C  ILE*     6.4     0.2    -      -       +      -
    402C  SOG      4.3    16.8    -      -       +      -
    167D  ALA      3.0    11.7    +      -       -      +
    168D  ILE*     3.2    16.6    -      -       +      +
    170D  ALA*     1.3    79.0    -      -       -      +
    172D  VAL*     1.3    64.6    +      -       +      +
    175D  LEU*     3.2    48.9    -      -       +      +
    176D  PRO*     3.3     6.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 172 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171C  LEU*     4.3    14.4    -      -       +      -
    172C  VAL*     5.1     9.0    -      -       +      -
    406C  D10      6.0     2.2    -      -       +      -
    122D  VAL*     4.9     1.9    -      -       -      +
    126D  THR*     3.9    22.0    -      -       +      -
    130D  GLU*     4.9     2.7    -      -       -      +
    168D  ILE*     3.2    24.6    +      -       +      +
    169D  SER      3.7     9.4    -      -       -      +
    171D  LEU*     1.3    82.8    -      -       +      +
    173D  SER*     1.3    60.2    +      -       -      +
    176D  PRO*     3.9    12.4    -      -       -      +
    207D  TYR*     5.4     2.9    +      -       -      -
    211D  SER*     5.4     4.3    -      -       -      -
    214D  ILE*     3.9    26.0    -      -       +      -
    215D  SER*     3.9    16.7    +      -       -      +
    402D  SOG      4.3     9.4    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 173 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119D  SER*     4.5     4.1    +      -       -      -
    122D  VAL*     3.5    32.4    -      -       -      +
    123D  LEU*     3.5    27.2    -      -       -      +
    126D  THR*     4.6     1.6    -      -       -      -
    169D  SER      2.6    23.9    +      -       -      -
    171D  LEU      3.3     0.4    -      -       -      -
    172D  VAL*     1.3    83.6    -      -       -      +
    174D  PHE*     1.3    75.2    +      -       -      +
    175D  LEU      3.5     0.4    -      -       -      -
    176D  PRO*     4.0     3.6    -      -       -      +
    177D  ILE*     3.4    22.2    -      -       -      +
    207D  TYR*     5.3     1.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 174 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116D  LEU*     5.0     1.8    -      -       +      -
    119D  SER*     3.5    45.0    +      -       -      -
    120D  LEU*     3.9    15.5    -      -       +      -
    123D  LEU*     3.6    28.0    -      -       +      -
    170D  ALA*     2.8    43.1    +      -       +      +
    173D  SER*     1.3    78.2    +      -       -      +
    175D  LEU*     1.3    59.6    +      -       +      +
    177D  ILE*     3.1     7.3    +      -       -      +
    178D  MET*     2.9    40.8    +      -       -      +
    403D  SOG      3.9    20.8    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 175 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171C  LEU*     4.1     8.1    -      -       +      -
    175C  LEU*     4.0    17.3    -      -       +      -
    179C  MET*     4.0    26.5    -      -       +      -
    181C  TRP*     5.4     0.9    -      -       +      -
    170D  ALA      3.4     3.2    +      -       -      +
    171D  LEU*     3.2    47.1    -      -       +      +
    174D  PHE*     1.3    79.7    -      -       +      +
    176D  PRO*     1.3    63.5    -      -       +      +
    178D  MET*     3.3    27.0    +      -       +      +
    179D  MET*     3.1    35.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PRO 176 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171C  LEU*     3.8    26.0    -      -       +      -
    171D  LEU      3.3    13.5    -      -       -      +
    172D  VAL      3.9    14.4    -      -       -      +
    173D  SER      4.0     3.1    -      -       -      +
    174D  PHE      3.8     0.9    -      -       -      -
    175D  LEU*     1.3    90.1    -      -       +      +
    177D  ILE*     1.3    60.2    +      -       -      +
    179D  MET*     5.3     0.2    -      -       -      -
    180D  HIS      3.1     2.3    +      -       -      -
    181D  TRP*     2.8    58.6    +      -       +      +
    182D  TRP*     3.8     3.1    -      -       -      -
    207D  TYR*     4.1    18.8    -      -       +      +
    402D  SOG      3.9    12.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 177 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115D  GLU*     4.0    13.1    -      -       +      +
    118D  THR*     3.8    30.5    -      -       +      +
    119D  SER*     3.5    22.9    -      -       -      +
    122D  VAL*     5.2     3.1    -      -       +      -
    173D  SER      3.4    17.0    -      -       -      +
    174D  PHE      3.1     9.2    +      -       -      +
    176D  PRO*     1.3    79.2    -      -       -      +
    178D  MET*     1.3    61.4    +      -       -      +
    180D  HIS*     3.1    11.8    +      -       -      -
    182D  TRP*     3.7    25.2    +      -       +      +
    201D  PHE*     4.0    16.8    -      -       +      -
    207D  TYR*     4.6    10.3    -      -       -      +
    403D  SOG      3.5    22.8    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 178 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    195B  ASP*     4.6     3.3    -      -       -      +
    197B  GLY*     5.3     0.3    -      -       -      -
    174D  PHE*     2.9    31.4    +      -       -      +
    175D  LEU*     3.5    32.3    -      -       +      +
    177D  ILE*     1.3    76.9    -      -       -      +
    179D  MET*     1.3    59.6    +      -       +      +
    180D  HIS*     3.2    17.1    +      -       -      -
    403D  SOG      2.6    92.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 179 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    194B  GLN      4.5    15.3    -      -       -      +
    195B  ASP*     4.0    18.4    -      -       +      +
    196B  PRO*     3.7    16.0    -      -       +      +
    171C  LEU*     5.8     0.4    -      -       -      -
    175C  LEU*     4.4    26.9    -      -       +      -
    175D  LEU*     3.1    28.1    +      -       +      +
    176D  PRO*     5.3     0.2    -      -       -      -
    177D  ILE      3.2     0.4    -      -       -      -
    178D  MET*     1.3    76.5    -      -       +      +
    180D  HIS*     1.3    75.0    +      -       -      +
    181D  TRP*     3.1    55.1    +      -       +      +
----------------------------------------------------------
 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