Contacts of the helix formed by residues 316 - 339 (chain B) in PDB entry 3RMD


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 ASN 316 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    176B  ASP*     5.2     0.5    -      -       -      +
    312B  LEU*     3.2    16.5    +      -       +      +
    315B  SER*     1.3    88.0    +      -       -      +
    317B  HIS*     1.3    62.8    +      -       -      +
    318B  GLN*     3.0    16.0    +      -       -      +
    319B  ARG*     3.3    36.0    +      -       +      +
    320B  TYR      3.1    16.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 317 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134B  ASP      6.0     0.2    -      -       -      -
    150B  ASP*     3.0    39.8    +      -       -      -
    151B  LEU      4.5     1.0    +      -       -      -
    159B  VAL*     3.1    39.1    -      -       +      +
    160B  GLU      3.2    22.2    +      -       -      +
    161B  GLU      4.4     2.6    +      -       -      -
    162B  TRP*     4.1    10.5    -      -       +      -
    313B  ARG*     2.9    41.4    +      -       -      +
    314B  GLU      3.8     3.2    +      -       -      +
    316B  ASN*     1.3    71.6    -      -       -      +
    318B  GLN*     1.3    67.5    +      -       -      +
    320B  TYR*     3.3     8.3    -      +       -      +
    321B  ILE*     3.3    25.1    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 318 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    161B  GLU      4.1     4.6    +      -       -      -
    162B  TRP*     3.4    24.9    -      -       -      +
    163B  SER*     2.9    48.0    -      -       -      +
    166B  ILE*     3.7    18.9    -      -       +      +
    167B  ALA      3.6     4.3    +      -       -      -
    176B  ASP*     3.0    24.6    -      -       -      +
    316B  ASN*     3.0    13.1    -      -       -      +
    317B  HIS*     1.3    83.4    +      -       -      +
    319B  ARG*     1.3    66.4    +      -       -      +
    321B  ILE      3.1     7.8    +      -       -      -
    322B  SER*     3.3    12.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 319 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171B  GLN*     3.0    22.4    +      -       -      +
    175B  GLY      3.5    10.1    +      -       -      -
    176B  ASP*     2.6    45.5    +      -       +      +
    303B  LEU*     2.9    48.9    +      -       +      +
    304B  LYS      4.4     2.2    +      -       -      -
    305B  TYR*     3.6    37.8    -      -       +      +
    306B  ASP*     5.3     1.6    -      -       -      +
    312B  LEU*     4.9     4.9    -      -       +      -
    316B  ASN*     3.1    29.7    +      -       +      +
    318B  GLN*     1.3    78.2    -      -       -      +
    320B  TYR*     1.3    54.5    +      -       -      +
    321B  ILE      3.1     0.3    +      -       -      -
    322B  SER*     3.1     2.6    +      -       -      -
    323B  TYR*     2.8    41.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 320 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116B  GLU*     3.0    42.0    -      -       +      +
    117B  VAL      3.9     2.4    +      -       -      -
    118B  THR*     3.5    12.3    +      -       -      -
    134B  ASP*     3.0    25.7    +      -       -      -
    135B  ALA*     4.6     3.6    -      -       +      -
    309B  ILE*     4.4    20.3    -      -       +      +
    312B  LEU*     3.8    22.8    -      -       +      +
    313B  ARG*     3.3    52.0    -      -       +      -
    316B  ASN      3.1    11.8    +      -       -      +
    317B  HIS*     3.3    17.0    -      +       -      +
    318B  GLN      3.1     0.2    -      -       -      -
    319B  ARG*     1.3    76.8    -      -       -      +
    321B  ILE*     1.3    70.3    +      -       +      +
    323B  TYR*     3.4    16.1    -      +       -      +
    324B  ASN*     3.5     6.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 321 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135B  ALA*     3.5    27.6    -      -       +      -
    148B  VAL*     4.0    24.7    -      -       +      -
    149B  PHE      5.2     0.7    -      -       -      +
    150B  ASP*     3.0    34.5    -      -       +      +
    162B  TRP*     3.8    31.6    -      -       +      -
    188B  TYR*     4.8     2.5    -      -       +      -
    317B  HIS*     3.3    23.3    +      -       +      +
    318B  GLN      3.1     2.8    +      -       -      +
    320B  TYR*     1.3    80.4    -      -       +      +
    322B  SER*     1.3    66.8    +      -       -      +
    323B  TYR      3.0     1.3    -      -       -      -
    324B  ASN*     2.9    14.9    +      -       +      +
    325B  ILE*     3.0    14.4    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 322 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162B  TRP*     2.7    27.6    +      -       -      +
    167B  ALA*     3.7     1.9    -      -       -      +
    176B  ASP*     2.9    39.6    +      -       -      +
    178B  VAL*     3.7    10.8    -      -       -      -
    318B  GLN      3.3     1.8    +      -       -      -
    319B  ARG*     3.1     6.6    +      -       -      -
    321B  ILE*     1.3    77.4    -      -       -      +
    323B  TYR*     1.3    58.0    +      -       -      +
    325B  ILE*     3.2    10.5    +      -       -      +
    326B  ILE*     2.9    37.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 323 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116B  GLU*     3.1    30.5    -      -       -      -
    302B  LYS*     3.4    48.6    +      -       +      +
    303B  LEU*     5.0     5.6    -      -       +      +
    305B  TYR*     4.4    26.4    +      +       +      -
    309B  ILE*     3.9    25.1    -      -       +      +
    312B  LEU*     4.8     7.6    -      -       +      -
    319B  ARG*     2.8    25.2    +      -       +      +
    320B  TYR*     3.4     8.7    -      +       -      +
    322B  SER*     1.3    78.7    -      -       -      +
    324B  ASN*     1.3    55.6    +      -       -      +
    326B  ILE*     3.6     6.2    +      -       -      +
    327B  ALA*     3.1    26.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 324 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114B  ASP*     3.4    36.4    +      -       -      +
    116B  GLU*     3.9    26.5    +      -       +      +
    135B  ALA*     3.8    23.8    -      -       +      +
    136B  ILE      3.8     1.4    +      -       -      -
    137B  THR*     3.3    23.4    +      -       -      +
    148B  VAL*     5.7     0.2    -      -       -      +
    320B  TYR      3.5     5.1    +      -       -      +
    321B  ILE*     2.9    13.1    +      -       +      +
    323B  TYR*     1.3    79.3    -      -       -      +
    325B  ILE*     1.3    64.0    +      -       -      +
    327B  ALA*     3.2    17.1    -      -       -      +
    328B  VAL*     3.3     6.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 325 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137B  THR*     3.9    21.1    -      -       +      +
    146B  PHE*     4.5    13.8    -      -       +      -
    148B  VAL*     4.1    22.4    -      -       +      -
    162B  TRP*     3.6    39.5    -      -       +      -
    178B  VAL*     4.8     5.2    -      -       +      -
    182B  ILE*     4.0    23.3    -      -       +      -
    186B  ILE*     4.2    14.6    -      -       +      -
    321B  ILE*     3.0    14.9    +      -       +      +
    322B  SER*     3.6     7.9    -      -       -      +
    324B  ASN*     1.3    73.1    -      -       -      +
    326B  ILE*     1.3    66.7    +      -       +      +
    328B  VAL*     3.2     5.5    +      -       -      +
    329B  TYR*     3.1    19.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 326 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    176B  ASP      5.1     4.0    -      -       -      +
    177B  GLU      4.6     2.2    -      -       -      +
    178B  VAL*     3.7    24.9    -      -       +      +
    179B  PRO*     3.6    31.6    -      -       +      -
    182B  ILE*     5.1     1.3    -      -       +      -
    301B  GLY      4.2     3.4    -      -       -      +
    302B  LYS*     4.4    11.4    -      -       +      -
    303B  LEU*     5.4     6.5    -      -       +      +
    322B  SER*     2.9    24.9    +      -       -      +
    323B  TYR*     3.7     7.0    -      -       -      +
    325B  ILE*     1.3    72.9    -      -       -      +
    327B  ALA*     1.3    66.6    +      -       -      +
    329B  TYR*     3.2     6.2    +      -       +      -
    330B  ARG*     2.8    65.1    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 327 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114B  ASP*     4.8    12.6    -      -       +      +
    290B  LEU*     3.6    29.1    -      -       +      +
    302B  LYS*     4.7    11.4    -      -       -      +
    323B  TYR*     3.1    17.6    +      -       +      +
    324B  ASN*     3.2    18.4    -      -       -      +
    325B  ILE      3.2     0.2    -      -       -      -
    326B  ILE*     1.3    78.9    -      -       -      +
    328B  VAL*     1.3    64.5    +      -       -      +
    330B  ARG*     3.4    15.4    +      -       -      +
    331B  VAL*     3.5     6.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 328 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112B  ASN*     3.4    39.0    +      -       +      +
    113B  PHE      4.5     0.7    -      -       -      +
    114B  ASP*     4.0    19.3    -      -       +      +
    137B  THR*     3.5    34.8    -      -       +      +
    139B  TYR*     3.9    14.1    -      -       +      +
    146B  PHE*     4.5     6.3    -      -       +      -
    324B  ASN      3.5    14.1    -      -       -      +
    325B  ILE      3.2     5.5    +      -       -      +
    327B  ALA*     1.3    77.0    -      -       -      +
    329B  TYR*     1.3    64.2    +      -       -      +
    331B  VAL*     3.2    17.8    +      -       -      +
    332B  LEU*     3.2    11.1    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 329 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146B  PHE*     4.0    17.2    -      +       +      -
    179B  PRO*     3.4    35.4    -      -       +      -
    181B  GLU*     3.1    23.4    +      -       +      +
    182B  ILE*     3.4    35.2    -      -       +      -
    325B  ILE      3.1    12.9    +      -       -      +
    326B  ILE*     3.7    10.3    -      -       +      +
    328B  VAL*     1.3    75.9    -      -       -      +
    330B  ARG*     1.3    56.0    +      -       -      +
    332B  LEU*     3.0    13.9    +      -       +      +
    333B  GLN*     2.7    83.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 330 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179B  PRO*     5.4     5.7    -      -       -      +
    290B  LEU*     4.5     7.0    -      -       +      -
    294B  SER*     4.3    20.9    -      -       -      +
    298B  LEU*     3.6     6.1    -      -       -      +
    300B  VAL*     3.5    35.7    -      -       -      +
    301B  GLY      2.5    34.9    +      -       -      +
    302B  LYS*     4.5     8.2    -      -       +      +
    303B  LEU*     5.5     3.6    -      -       -      +
    326B  ILE*     2.8    49.8    +      -       +      +
    327B  ALA*     3.5     9.0    -      -       -      +
    328B  VAL      3.2     0.2    -      -       -      -
    329B  TYR*     1.3    79.5    -      -       -      +
    331B  VAL*     1.3    57.8    +      -       -      +
    333B  GLN*     3.0    29.1    +      -       -      +
    334B  ILE*     2.7    33.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 331 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112B  ASN*     3.4    23.6    -      -       -      +
    114B  ASP*     5.0     2.5    -      -       -      +
    215B  GLY*     4.3     5.2    -      -       -      +
    216B  TRP*     3.9    21.8    -      -       +      +
    273B  TYR*     3.9    37.0    -      -       +      -
    290B  LEU*     3.6    25.8    -      -       +      -
    327B  ALA      3.8     9.2    -      -       -      +
    328B  VAL*     3.2     5.5    +      -       -      +
    330B  ARG*     1.3    75.4    -      -       -      +
    332B  LEU*     1.3    64.4    +      -       -      +
    334B  ILE*     2.9    10.9    +      -       -      +
    335B  ASP*     2.8    23.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 332 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112B  ASN*     3.8    20.4    -      -       -      +
    139B  TYR*     3.4    47.8    -      -       +      -
    146B  PHE*     3.5    34.8    -      -       +      -
    328B  VAL      3.2    10.0    +      -       -      +
    329B  TYR*     3.0    18.8    +      -       +      +
    331B  VAL*     1.3    79.2    -      -       -      +
    333B  GLN*     1.3    52.3    +      -       -      +
    335B  ASP*     3.3     7.8    +      -       +      +
    336B  ALA*     2.7    35.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 333 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181B  GLU*     5.2     1.2    +      -       -      -
    298B  LEU*     3.2    25.0    -      -       +      +
    300B  VAL*     5.2     0.2    -      -       -      +
    329B  TYR*     2.7    66.2    +      -       +      +
    330B  ARG*     3.0    39.6    +      -       -      +
    332B  LEU*     1.3    70.3    -      -       -      +
    334B  ILE*     1.3    67.4    +      -       -      +
    336B  ALA*     2.9    19.3    +      -       -      +
    337B  LYS*     3.0    14.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 334 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    216B  TRP*     4.2    12.1    -      -       +      -
    273B  TYR*     3.9    22.0    -      -       +      -
    277B  TYR*     4.4    11.9    -      -       +      -
    290B  LEU*     4.7     5.4    -      -       +      -
    293B  ILE*     3.7    28.0    -      -       +      +
    294B  SER*     4.0    18.6    -      -       -      +
    297B  GLU*     4.4     6.5    -      -       +      -
    298B  LEU*     3.9    23.1    -      -       +      +
    330B  ARG      2.7    20.4    +      -       -      +
    331B  VAL*     3.4    12.6    -      -       -      +
    333B  GLN*     1.3    73.4    -      -       -      +
    335B  ASP*     1.3    58.1    +      -       -      +
    337B  LYS*     3.2     2.7    +      -       -      +
    338B  ARG*     2.7    39.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 335 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    273B  TYR*     2.8    41.9    +      -       +      +
    331B  VAL*     2.8    16.2    +      -       +      +
    332B  LEU*     3.7     7.9    -      -       +      +
    334B  ILE*     1.3    72.1    -      -       -      +
    336B  ALA*     1.3    62.6    +      -       -      +
    339B  GLN*     2.5    51.6    +      -       -      +
    340B  PHE      3.0     3.6    +      -       -      -
    341B  ILE*     3.3    24.1    +      -       -      +
    342B  ASN      5.3     0.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 336 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    332B  LEU      2.7    19.1    +      -       -      +
    333B  GLN*     3.1    15.7    -      -       -      +
    335B  ASP*     1.3    72.7    -      -       -      +
    337B  LYS*     1.3    61.3    +      -       +      +
    339B  GLN*     3.9    17.3    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 337 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    296B  PHE      4.7     1.4    +      -       -      -
    297B  GLU*     2.5    56.9    +      -       +      +
    298B  LEU*     4.4    11.4    -      -       +      -
    299B  ASN*     5.5     0.8    -      -       -      +
    333B  GLN      3.0     9.8    +      -       -      +
    334B  ILE      3.5     7.4    -      -       -      +
    335B  ASP      3.0     0.2    -      -       -      -
    336B  ALA*     1.3    79.9    -      -       -      +
    338B  ARG*     1.3    70.8    +      -       -      +
    339B  GLN*     4.2     5.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 338 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    273B  TYR*     3.9     2.7    -      -       -      +
    277B  TYR*     4.3     2.7    +      -       +      -
    280B  PHE      5.0     1.2    +      -       -      -
    281B  SER*     2.9    35.4    +      -       -      +
    283B  THR*     4.6     2.6    -      -       -      +
    296B  PHE*     4.6     6.5    -      -       -      -
    297B  GLU*     2.7    39.5    +      -       -      +
    334B  ILE*     2.7    34.3    +      -       +      +
    337B  LYS*     1.3    82.0    -      -       +      +
    339B  GLN*     1.3    69.6    +      -       -      +
    340B  PHE*     3.4    50.3    +      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 339 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    335B  ASP*     2.5    38.8    +      -       -      +
    336B  ALA*     3.9    16.8    -      -       -      +
    337B  LYS      4.2     4.5    -      -       -      +
    338B  ARG*     1.3    75.2    -      -       -      +
    340B  PHE*     1.3    62.6    +      -       -      +
    341B  ILE      3.5     0.9    -      -       -      -
    342B  ASN*     3.7    29.4    +      -       -      +
    343B  LEU*     3.4    18.4    +      -       -      +
    550B  VAL*     5.3    11.7    -      -       +      +
    554B  THR*     5.4     5.1    +      -       -      +
----------------------------------------------------------
 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