Contacts of the helix formed by residues 191 - 215 (chain A) in PDB entry 1WMA


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 SER 191 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141A  MET*     5.9     0.7    -      -       -      +
    145A  ALA*     5.2     3.3    -      -       -      +
    174A  PHE*     4.6     0.4    -      -       -      -
    189A  PRO*     3.4     7.0    -      -       -      +
    190A  SER*     1.3    75.4    -      -       -      +
    192A  ALA*     1.3    63.8    +      -       -      +
    193A  TYR*     4.1     1.4    -      -       -      +
    194A  GLY*     3.0    22.0    +      -       -      -
    195A  VAL*     3.1    25.7    +      -       -      +
    301A  SO4      2.7    26.3    +      -       -      -
    310A  PE5      4.1    22.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 192 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102A  PHE*     3.8    24.5    -      -       +      -
    105A  GLN*     4.8     3.4    -      -       +      +
    106A  ALA*     3.9    26.7    -      -       -      +
    109A  THR*     4.3     5.2    -      -       +      +
    174A  PHE*     3.7    16.5    -      -       +      -
    190A  SER      3.4     3.8    +      -       -      -
    191A  SER*     1.3    69.6    -      -       -      +
    193A  TYR*     1.3    68.2    +      -       -      +
    195A  VAL*     3.1     4.2    +      -       -      +
    196A  THR*     3.0    26.4    +      -       +      +
    301A  SO4      3.0    11.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 193 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92A  ILE      3.5    26.5    -      -       -      -
     93A  ALA*     3.6    18.8    -      -       +      -
     94A  PHE      5.9     0.7    -      -       -      +
    109A  THR*     4.5     7.7    +      -       +      +
    113A  ASN*     3.8    12.6    -      -       -      -
    139A  SER*     3.9     4.9    -      -       -      -
    141A  MET*     4.1     9.9    -      -       +      -
    191A  SER*     4.2     2.9    -      -       -      +
    192A  ALA*     1.3    77.2    -      -       -      +
    194A  GLY*     1.3    64.3    +      -       -      +
    196A  THR*     2.8    24.8    +      -       -      -
    197A  LYS*     3.1    25.9    +      -       +      +
    234A  MET*     4.4     0.9    -      -       -      -
    301A  SO4      2.9    17.9    +      -       -      +
    307A  AB3      2.5    43.5    +      +       -      -
    309A  NDP      2.7    29.1    +      -       -      -
    310A  PE5      3.8    18.8    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 194 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141A  MET*     4.0    14.1    -      -       -      -
    142A  SER*     4.0     1.7    -      -       -      -
    145A  ALA*     3.8    19.9    -      -       -      +
    191A  SER*     3.0    19.6    +      -       -      -
    192A  ALA      3.2     0.2    -      -       -      -
    193A  TYR*     1.3    83.3    -      -       -      +
    195A  VAL*     1.3    55.3    +      -       -      +
    197A  LYS*     3.2     5.2    +      -       -      +
    198A  ILE*     2.9    28.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 195 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110A  MET*     4.0     3.1    -      -       +      -
    171A  MET*     3.7    15.6    -      -       +      +
    174A  PHE*     3.8    39.9    -      -       +      -
    188A  TRP*     3.9    17.9    -      -       +      -
    189A  PRO*     3.7    34.3    -      -       +      -
    191A  SER      3.1    15.4    +      -       -      +
    192A  ALA      3.1     6.0    +      -       -      +
    194A  GLY*     1.3    71.1    -      -       -      +
    196A  THR*     1.3    67.0    +      -       -      +
    198A  ILE*     3.1    13.3    +      -       +      +
    199A  GLY      3.0    17.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 196 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  ALA      4.8     0.4    -      -       -      +
    109A  THR*     3.5    24.0    -      -       -      +
    110A  MET*     3.5    40.2    -      -       +      +
    113A  ASN*     3.1    33.8    +      -       -      +
    114A  PHE*     4.3     4.3    -      -       -      +
    174A  PHE*     5.8     0.7    -      -       +      -
    192A  ALA      3.0    15.4    +      -       -      +
    193A  TYR*     2.8    15.8    +      -       -      -
    195A  VAL*     1.3    76.3    -      -       -      +
    197A  LYS*     1.3    58.0    +      -       -      +
    199A  GLY*     3.1     4.7    +      -       -      -
    200A  VAL*     3.1    26.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 197 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90A  ALA      5.0     1.4    +      -       -      -
     91A  GLY*     4.9     0.8    -      -       -      -
    113A  ASN*     4.0    14.8    -      -       +      +
    137A  VAL      3.0    18.2    +      -       -      -
    138A  SER*     3.1    34.2    +      -       -      +
    139A  SER*     4.0    14.4    -      -       -      +
    142A  SER*     3.4    13.5    -      -       -      +
    193A  TYR*     3.1    32.9    +      -       +      +
    194A  GLY*     3.8     7.0    -      -       -      +
    196A  THR*     1.3    78.9    +      -       -      +
    198A  ILE*     1.3    64.1    +      -       -      +
    199A  GLY      3.1     0.9    -      -       -      -
    200A  VAL*     4.1    12.7    -      -       +      +
    201A  THR*     2.9    22.5    +      -       -      -
    309A  NDP      2.9    44.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 198 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142A  SER*     3.5    23.0    -      -       -      +
    145A  ALA*     3.8     9.9    -      -       +      -
    146A  LEU*     3.7    23.6    -      -       +      +
    149A  CYS*     3.8    23.6    -      -       -      -
    157A  PHE*     3.8    40.6    -      -       +      -
    171A  MET*     4.7     1.1    -      -       +      -
    194A  GLY      2.9    16.7    +      -       -      +
    195A  VAL*     3.1    17.7    +      -       +      +
    197A  LYS*     1.3    73.9    -      -       -      +
    199A  GLY*     1.3    64.6    +      -       -      +
    201A  THR*     3.2     1.7    +      -       -      -
    202A  VAL*     2.9    30.8    +      -       +      +
    276A  TRP*     4.2    10.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 199 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  PHE*     3.6    16.3    -      -       -      -
    167A  LEU*     3.7     6.8    -      -       -      +
    171A  MET*     3.7    23.3    -      -       -      -
    195A  VAL      3.0    11.3    +      -       -      -
    196A  THR      3.1     6.0    +      -       -      -
    198A  ILE*     1.3    77.3    -      -       -      +
    200A  VAL*     1.3    55.5    +      -       -      +
    203A  LEU*     2.9    32.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 200 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113A  ASN*     3.2    28.9    -      -       +      +
    114A  PHE*     4.6     2.7    -      -       -      -
    117A  THR*     4.7    12.1    -      -       +      +
    136A  ASN*     4.0    23.5    +      -       +      -
    137A  VAL      4.1     4.9    -      -       -      +
    138A  SER*     3.9    24.9    -      -       -      +
    196A  THR      3.1    13.6    +      -       -      +
    197A  LYS*     3.2    21.3    +      -       +      +
    199A  GLY*     1.3    75.1    -      -       -      +
    201A  THR*     1.3    62.1    +      -       -      +
    203A  LEU*     3.4     7.8    +      -       +      +
    204A  SER*     2.8    28.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 201 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  SER*     2.8    23.6    +      -       -      -
    142A  SER*     3.0    11.6    +      -       -      -
    197A  LYS      2.9     9.0    +      -       -      -
    198A  ILE      3.7     3.1    -      -       -      -
    200A  VAL*     1.3    75.6    -      -       -      +
    202A  VAL*     1.3    61.9    +      -       -      +
    204A  SER*     3.2     9.0    +      -       -      -
    205A  ARG*     3.1    26.4    +      -       +      +
    224A  ALA*     4.3     6.5    -      -       +      -
    266A  GLN      6.3     0.2    -      -       -      -
    267A  PHE*     3.5    23.3    -      -       +      -
    276A  TRP*     3.6    42.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 202 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    157A  PHE*     3.5    31.9    -      -       +      +
    162A  ILE*     4.2    19.3    -      -       +      -
    167A  LEU*     3.9    25.1    -      -       +      -
    198A  ILE*     2.9    32.3    +      -       +      +
    201A  THR*     1.3    70.1    -      -       -      +
    203A  LEU*     1.3    65.9    +      -       -      +
    205A  ARG*     3.1    11.3    +      -       +      +
    206A  ILE*     2.9    31.1    +      -       +      +
    276A  TRP*     3.8    18.4    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 203 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  PHE*     4.2    13.9    -      -       +      -
    117A  THR*     4.6    14.1    -      -       +      -
    118A  ARG*     4.0    29.4    -      -       +      +
    121A  CYS*     4.9     2.9    -      -       -      -
    136A  ASN*     5.5     3.8    -      -       -      +
    164A  GLU*     4.0    24.2    -      -       +      +
    167A  LEU*     3.5    15.3    -      -       +      +
    199A  GLY      2.9    19.4    +      -       -      +
    200A  VAL*     3.7     6.5    -      -       -      +
    201A  THR      3.3     0.2    -      -       -      -
    202A  VAL*     1.3    76.0    -      -       -      +
    204A  SER*     1.3    56.3    +      -       -      +
    206A  ILE*     3.3     5.5    +      -       +      +
    207A  HIS*     2.9    71.0    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 204 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136A  ASN*     2.9    26.3    +      -       -      +
    200A  VAL      2.8    18.7    +      -       -      -
    201A  THR      3.3     8.5    -      -       -      -
    203A  LEU*     1.3    77.4    -      -       -      +
    205A  ARG*     1.3    58.9    +      -       -      +
    207A  HIS*     4.6     0.7    -      -       -      -
    208A  ALA*     2.9    28.3    +      -       -      +
    222A  LEU*     3.3    21.9    -      -       -      +
    223A  ASN*     5.1     0.2    -      -       -      -
    224A  ALA*     3.5    29.1    -      -       -      +
    265A  GLY*     5.1     2.5    -      -       -      -
    266A  GLN      5.4     0.9    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 205 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    157A  PHE      4.3     4.0    +      -       -      -
    158A  ARG*     3.1    28.3    +      -       -      +
    159A  SER      4.3     5.1    +      -       -      -
    160A  GLU*     4.3    19.0    +      -       -      +
    162A  ILE*     6.6     0.2    -      -       +      -
    201A  THR*     3.1    18.9    +      -       +      +
    202A  VAL*     3.1    14.1    +      -       +      +
    204A  SER*     1.3    76.5    -      -       -      +
    206A  ILE*     1.3    63.5    +      -       +      +
    208A  ALA*     3.4     3.6    +      -       -      +
    209A  ARG*     3.1    23.2    +      -       -      +
    265A  GLY*     3.7    26.5    +      -       -      +
    266A  GLN*     5.6     5.5    -      -       -      +
    276A  TRP*     3.4    48.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 206 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162A  ILE*     3.6    29.4    -      -       +      +
    163A  THR      3.7    23.8    -      -       -      +
    164A  GLU*     3.9    20.2    -      -       +      +
    167A  LEU*     3.9    22.7    -      -       +      -
    202A  VAL*     2.9    19.4    +      -       +      +
    203A  LEU*     3.6     7.4    -      -       +      +
    205A  ARG*     1.3    77.2    -      -       +      +
    207A  HIS*     1.3    71.0    +      -       +      +
    209A  ARG*     3.2    19.3    +      -       -      +
    210A  LYS*     3.0    39.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 207 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118A  ARG*     5.4     1.3    -      -       -      -
    121A  CYS*     3.7    31.0    -      -       +      +
    125A  LEU*     3.6     8.1    -      -       -      +
    136A  ASN*     5.3     2.6    +      -       -      -
    164A  GLU*     2.8    28.4    +      -       -      -
    203A  LEU*     2.9    45.0    +      -       +      +
    204A  SER*     4.0     1.5    -      -       -      +
    206A  ILE*     1.3    81.0    -      -       +      +
    208A  ALA*     1.3    65.3    +      -       -      +
    210A  LYS*     3.4     2.8    +      -       +      -
    211A  LEU*     3.0    27.0    +      -       -      +
    222A  LEU*     3.8    22.4    -      -       +      +
    311A  P33      3.4    33.6    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 208 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    204A  SER      2.9    13.8    +      -       -      +
    205A  ARG      3.8     3.1    -      -       -      +
    207A  HIS*     1.3    76.9    -      -       -      +
    209A  ARG*     1.3    62.7    +      -       -      +
    211A  LEU*     3.2     3.6    +      -       -      -
    212A  SER*     3.0    13.4    +      -       -      -
    222A  LEU*     4.0     6.1    -      -       +      +
    264A  HIS*     2.9    40.3    +      -       +      +
    265A  GLY*     3.3    36.1    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 209 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160A  GLU*     3.4    26.8    +      -       -      -
    161A  THR*     4.3     4.9    +      -       -      -
    162A  ILE      3.1    25.7    +      -       -      -
    205A  ARG      3.1    17.4    +      -       -      +
    206A  ILE*     3.2    15.7    +      -       -      +
    208A  ALA*     1.3    75.8    -      -       -      +
    210A  LYS*     1.3    65.9    +      -       -      +
    212A  SER*     3.2     7.8    +      -       -      -
    213A  GLU*     2.9    76.9    +      -       +      +
    303A  SO4      2.7    46.1    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 210 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    164A  GLU*     4.7    16.5    +      -       -      +
    165A  GLU*     5.2     6.9    +      -       -      -
    206A  ILE*     3.0    29.1    +      -       +      +
    207A  HIS*     3.8     6.7    -      -       +      +
    209A  ARG*     1.3    82.7    -      -       -      +
    211A  LEU*     1.3    53.9    +      -       -      +
    213A  GLU*     4.2     8.1    -      -       -      +
    214A  GLN*     2.6    57.7    +      -       -      +
    303A  SO4      3.4    37.4    +      -       -      +
    311A  P33      3.8    41.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 211 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125A  LEU*     5.9     4.7    -      -       +      +
    128A  ILE*     6.1     1.3    -      -       +      -
    134A  VAL*     5.7     0.7    -      -       +      -
    207A  HIS      3.0    19.9    +      -       -      +
    208A  ALA      3.4     6.7    -      -       -      +
    210A  LYS*     1.3    76.6    -      -       -      +
    212A  SER*     1.3    56.6    +      -       -      +
    215A  ARG*     2.8    55.9    +      -       +      +
    220A  ILE*     3.8    39.7    -      -       +      +
    222A  LEU*     3.8    32.5    -      -       +      -
    264A  HIS*     4.0    12.8    -      -       +      +
    302A  SO4      5.6     0.3    +      -       -      -
    311A  P33      3.6    26.2    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 212 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    208A  ALA      3.0    14.7    +      -       -      -
    209A  ARG*     3.2     9.3    +      -       -      -
    211A  LEU*     1.3    77.0    -      -       -      +
    213A  GLU*     1.3    63.3    +      -       -      +
    216A  LYS*     3.9    20.7    +      -       -      +
    264A  HIS*     3.1    21.1    +      -       -      -
    302A  SO4      5.4     5.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 213 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    209A  ARG*     2.9    61.6    +      -       +      +
    210A  LYS*     3.7     6.4    -      -       -      +
    212A  SER*     1.3    82.7    -      -       -      +
    214A  GLN*     1.3    66.8    +      -       +      +
    216A  LYS*     4.7    14.6    -      -       -      +
    303A  SO4      4.3     6.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 214 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    210A  LYS*     2.6    47.7    +      -       -      +
    213A  GLU*     1.3    83.8    +      -       +      +
    215A  ARG*     1.3    61.8    +      -       -      +
    216A  LYS*     3.7     3.7    -      -       -      -
    303A  SO4      4.4     9.7    +      -       -      -
    311A  P33      3.8    25.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 215 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125A  LEU      4.0    14.8    +      -       -      -
    126A  PRO*     4.7     5.9    +      -       -      +
    128A  ILE*     2.9    31.5    +      -       -      +
    129A  LYS*     4.3     0.2    -      -       -      +
    130A  PRO*     4.1    12.1    -      -       -      +
    211A  LEU*     2.8    32.6    +      -       +      +
    214A  GLN*     1.3    82.4    -      -       -      +
    216A  LYS*     1.3    68.8    +      -       -      +
    217A  GLY      3.2     0.2    +      -       -      -
    218A  ASP*     2.9    48.8    +      -       +      +
    219A  LYS      4.6     0.2    +      -       -      -
    220A  ILE*     3.3    21.4    +      -       +      +
    302A  SO4      4.2     5.4    +      -       -      -
    311A  P33      3.8    29.2    +      -       -      -
----------------------------------------------------------
 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