Contacts of the helix formed by residues 453 - 478 (chain A) in PDB entry 4YOZ


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 HIS 453 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    442A  TYR*     3.5     5.0    -      -       -      -
    452A  SER*     1.3    76.9    -      -       -      +
    454A  ILE*     1.3    75.8    +      -       +      +
    455A  ASP*     3.1    52.3    +      -       -      +
    456A  PHE*     3.2    30.4    +      +       +      +
    457A  ALA      3.4     7.8    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 454 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    439A  CYS*     3.7    34.5    -      -       +      +
    443A  THR*     3.7    25.8    -      -       +      +
    452A  SER      3.6     1.4    +      -       -      -
    453A  HIS*     1.3    84.8    +      -       +      +
    455A  ASP*     1.3    70.4    +      -       -      +
    457A  ALA*     3.2     2.7    +      -       +      -
    458A  VAL*     2.9    38.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 455 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    453A  HIS*     3.1    29.6    +      -       -      +
    454A  ILE*     1.3    83.9    -      -       -      +
    456A  PHE*     1.3    65.1    +      -       +      +
    458A  VAL*     3.7     6.8    +      -       -      +
    459A  ASN*     3.2    22.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 456 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    442A  TYR*     3.4    18.6    -      -       +      +
    452A  SER*     5.9     1.3    -      -       -      -
    453A  HIS*     3.2    27.7    +      +       +      +
    454A  ILE      3.2     0.6    -      -       -      -
    455A  ASP*     1.3    81.1    -      -       +      +
    457A  ALA*     1.3    58.8    +      -       -      +
    459A  ASN*     3.2     8.2    +      -       +      +
    460A  ARG*     2.8    57.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 457 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    438A  PHE*     3.3    18.1    -      -       +      -
    439A  CYS*     4.0    10.5    -      -       -      -
    442A  TYR*     3.3    37.8    -      -       +      -
    453A  HIS      3.4     2.8    +      -       -      +
    454A  ILE*     3.2    26.0    +      -       +      +
    456A  PHE*     1.3    78.4    -      -       -      +
    458A  VAL*     1.3    51.1    +      -       -      +
    460A  ARG*     3.2     1.8    +      -       -      -
    461A  LEU*     2.8    31.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 458 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    439A  CYS*     4.4     7.6    -      -       -      -
    454A  ILE*     2.9    38.3    +      -       +      +
    455A  ASP*     4.0     7.0    -      -       -      +
    457A  ALA*     1.3    74.1    -      -       -      +
    459A  ASN*     1.3    53.4    +      -       -      +
    461A  LEU*     3.5    10.8    -      -       +      +
    462A  LYS*     2.7    42.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 459 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    455A  ASP      3.2    12.9    +      -       -      +
    456A  PHE*     3.2    12.3    +      -       +      +
    458A  VAL*     1.3    77.9    -      -       -      +
    460A  ARG*     1.3    87.3    +      -       -      +
    462A  LYS*     3.8     6.5    -      -       -      +
    463A  LEU*     3.1    32.3    +      -       -      +
    513A  TYR*     4.0    13.8    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 460 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    438A  PHE*     4.0    13.7    -      -       +      -
    442A  TYR*     4.4    23.3    +      -       +      +
    456A  PHE*     2.8    48.4    +      -       -      +
    457A  ALA*     3.4     9.2    -      -       -      +
    459A  ASN*     1.3    95.1    +      -       -      +
    461A  LEU*     1.3    64.0    +      -       -      +
    463A  LEU*     3.3     3.2    +      -       -      +
    464A  ALA*     3.0    22.7    +      -       -      +
    506A  LEU*     4.4     4.2    -      -       +      +
    509A  VAL*     3.7    28.6    -      -       +      +
    510A  LEU*     4.5    15.1    -      -       +      +
    513A  TYR*     3.6    48.4    -      -       -      +
    515A  SER*     5.8     1.6    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 461 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    431A  LEU      5.3     0.2    -      -       -      +
    435A  GLY*     3.5    40.6    -      -       -      +
    438A  PHE*     4.3     8.3    -      -       +      -
    439A  CYS*     4.5     9.2    -      -       -      -
    457A  ALA      2.8    21.0    +      -       -      +
    458A  VAL*     3.5     9.9    -      -       +      +
    460A  ARG*     1.3    73.1    -      -       -      +
    462A  LYS*     1.3    58.1    +      -       -      +
    464A  ALA*     3.0     4.3    +      -       -      +
    465A  GLU*     2.9    49.6    +      -       +      +
    502A  MET*     3.6    29.2    -      -       +      -
    506A  LEU*     4.2    15.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 462 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    406A  ASN*     3.8    33.2    +      -       +      +
    458A  VAL*     2.7    28.5    +      -       +      +
    459A  ASN*     3.8     8.1    -      -       -      +
    461A  LEU*     1.3    73.7    -      -       -      +
    463A  LEU*     1.3    63.4    +      -       +      +
    465A  GLU*     3.3    13.0    +      -       -      +
    466A  ILE*     3.0    41.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 463 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    394A  VAL*     6.0     0.7    -      -       +      -
    397A  LEU*     3.7    34.8    -      -       +      -
    398A  GLN*     5.8     7.2    -      -       +      -
    401A  VAL*     4.2    26.2    -      -       +      +
    459A  ASN*     3.1    25.2    +      -       -      +
    460A  ARG      3.6     4.7    -      -       -      +
    462A  LYS*     1.3    79.7    -      -       +      +
    464A  ALA*     1.3    61.7    +      -       -      +
    466A  ILE*     3.3    13.5    +      -       +      +
    467A  LEU*     3.1    24.3    +      -       -      +
    509A  VAL*     4.1     8.7    -      -       +      -
    513A  TYR*     3.9    24.9    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 464 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    460A  ARG      3.0     9.1    +      -       -      +
    461A  LEU      3.0     7.2    +      -       -      +
    463A  LEU*     1.3    77.6    -      -       -      +
    465A  GLU*     1.3    58.5    +      -       -      +
    467A  LEU*     3.3     3.9    +      -       -      +
    468A  TYR*     2.8    28.4    +      -       -      +
    502A  MET*     3.6    10.5    -      -       +      -
    505A  CYS*     3.5    10.3    -      -       -      +
    506A  LEU*     3.6    45.5    -      -       +      +
    509A  VAL*     3.9     7.8    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 465 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    406A  ASN*     3.5    36.6    +      -       +      +
    431A  LEU*     3.9    37.5    -      -       +      +
    432A  LYS*     5.6     0.3    -      -       -      -
    461A  LEU*     2.9    32.4    +      -       +      +
    462A  LYS*     3.6    13.3    -      -       -      +
    463A  LEU      3.3     0.2    -      -       -      -
    464A  ALA*     1.3    75.2    -      -       -      +
    466A  ILE*     1.3    64.8    +      -       -      +
    468A  TYR*     3.3     7.3    +      -       -      +
    469A  TYR*     3.2    29.5    +      -       -      -
    502A  MET*     3.8    15.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 466 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    401A  VAL*     3.7    34.1    -      -       +      +
    404A  LEU*     3.7    40.2    -      -       +      +
    405A  LYS      3.7    10.0    -      -       -      +
    406A  ASN*     3.7    19.5    -      -       +      +
    462A  LYS*     3.0    32.2    +      -       +      +
    463A  LEU*     3.6    17.7    -      -       +      +
    464A  ALA      3.3     0.2    -      -       -      -
    465A  GLU*     1.3    75.4    -      -       -      +
    467A  LEU*     1.3    63.2    +      -       -      +
    469A  TYR*     3.6     2.1    +      -       -      +
    470A  LYS*     3.2    21.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 467 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    397A  LEU*     3.8    24.5    -      -       +      -
    400A  ILE*     3.7    31.2    -      -       +      -
    401A  VAL*     4.3    10.7    -      -       +      +
    463A  LEU      3.1    11.0    +      -       -      +
    464A  ALA      3.5     8.1    -      -       -      +
    466A  ILE*     1.3    77.6    -      -       -      +
    468A  TYR*     1.3    62.4    +      -       -      +
    470A  LYS*     3.3     6.4    +      -       +      +
    471A  ILE*     2.9    45.1    +      -       +      +
    505A  CYS*     3.8    14.8    -      -       +      +
    508A  ILE*     3.9    22.9    -      -       +      -
    509A  VAL*     4.3    12.6    -      -       +      -
    544A  GLU*     4.9     5.2    -      -       +      +
    547A  LEU*     5.4     2.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 468 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    427A  ILE*     3.2    29.6    -      -       +      +
    431A  LEU*     3.8    25.6    -      -       +      -
    464A  ALA      2.8    17.8    +      -       -      +
    465A  GLU      3.5     4.7    -      -       -      +
    466A  ILE      3.3     0.2    -      -       -      -
    467A  LEU*     1.3    76.8    -      -       -      +
    469A  TYR*     1.3    71.3    -      +       -      +
    471A  ILE*     3.9     0.5    -      -       -      -
    472A  LEU*     2.8    48.9    +      -       +      +
    498A  HIS*     2.6    51.0    +      -       -      +
    501A  LEU*     3.6    32.2    -      -       +      +
    502A  MET*     3.8    24.0    -      -       +      -
    505A  CYS*     3.6     9.6    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 469 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    405A  LYS      4.6     2.9    -      -       -      +
    406A  ASN      3.0    34.1    -      -       -      -
    407A  ALA*     3.7    14.4    -      -       -      +
    408A  PRO*     3.5    36.5    -      -       +      +
    409A  SER      5.3     1.3    +      -       -      +
    412A  LEU*     3.9    14.3    -      -       +      +
    416A  PHE*     5.0     1.8    -      +       -      -
    427A  ILE*     4.1    12.1    -      -       +      +
    428A  MET*     4.0    22.7    -      -       -      +
    431A  LEU*     3.4    30.9    -      -       +      +
    465A  GLU      3.2    21.4    +      -       -      +
    466A  ILE      4.3     2.5    -      -       -      +
    468A  TYR*     1.3    95.4    -      +       -      +
    470A  LYS*     1.3    61.3    +      -       -      +
    472A  LEU*     4.3     4.5    -      -       +      -
    473A  GLU*     3.1    26.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 470 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    400A  ILE*     3.3    34.5    -      -       +      +
    401A  VAL*     5.4     1.1    -      -       +      -
    404A  LEU*     3.7    26.7    -      -       +      -
    466A  ILE      3.2    18.9    +      -       -      +
    467A  LEU*     3.5     8.5    -      -       +      +
    468A  TYR      3.2     0.6    -      -       -      -
    469A  TYR*     1.3    77.1    -      -       -      +
    471A  ILE*     1.3    62.3    +      -       -      +
    473A  GLU*     3.4     7.7    +      -       -      +
    474A  THR*     3.1    32.3    +      -       -      +
    543A  SER      5.7     0.2    +      -       -      -
    544A  GLU*     2.7    34.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 471 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    467A  LEU*     2.9    36.7    +      -       +      +
    468A  TYR      4.0     2.2    -      -       -      +
    470A  LYS*     1.3    74.0    -      -       -      +
    472A  LEU*     1.3    61.7    +      -       -      +
    474A  THR*     3.2     7.8    +      -       -      -
    475A  VAL*     2.8    40.1    +      -       +      +
    501A  LEU*     3.8    21.8    -      -       +      -
    505A  CYS*     4.0    19.5    -      -       -      -
    508A  ILE*     6.3     1.6    -      -       +      -
    539A  VAL*     5.5     0.7    -      -       +      -
    540A  VAL*     4.3    28.3    -      -       +      -
    543A  SER*     3.9    20.4    -      -       -      -
    544A  GLU*     4.3    22.0    -      -       +      +
    547A  LEU*     6.1     0.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 472 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    412A  LEU*     3.9     9.0    -      -       +      -
    416A  PHE*     3.9    26.9    -      -       +      -
    427A  ILE*     4.2     6.1    -      -       +      -
    468A  TYR*     2.8    47.3    +      -       +      +
    469A  TYR*     4.0     3.8    -      -       +      +
    471A  ILE*     1.3    78.0    -      -       -      +
    473A  GLU*     1.3    57.8    +      -       -      +
    475A  VAL*     3.3     3.7    +      -       +      +
    476A  MET*     2.9    62.2    +      -       +      +
    492A  LEU*     4.3     1.6    -      -       +      -
    497A  PHE*     4.1    12.6    -      -       +      -
    498A  HIS*     4.0    16.8    -      -       +      +
    501A  LEU*     4.0    10.7    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 473 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    409A  SER*     2.4    34.1    +      -       -      +
    411A  GLN*     3.3    31.1    +      -       -      +
    412A  LEU*     3.9    25.8    -      -       +      +
    415A  ILE*     5.8     0.2    -      -       +      -
    469A  TYR      3.1    20.8    +      -       -      +
    470A  LYS*     3.6     6.7    -      -       -      +
    471A  ILE      3.2     0.2    -      -       -      -
    472A  LEU*     1.3    76.2    -      -       -      +
    474A  THR*     1.3    64.0    +      -       -      +
    476A  MET*     3.3     0.7    +      -       -      +
    477A  VAL*     3.0    40.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 474 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    470A  LYS*     3.1    22.8    +      -       -      +
    471A  ILE*     3.2     8.9    +      -       -      -
    473A  GLU*     1.3    77.4    -      -       -      +
    475A  VAL*     1.3    61.1    +      -       -      +
    477A  VAL*     4.0     4.1    -      -       -      +
    478A  GLN*     3.3    48.9    +      -       -      +
    543A  SER*     3.3    35.7    +      -       -      +
    544A  GLU*     5.6     0.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 475 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    471A  ILE*     2.8    30.6    +      -       +      +
    472A  LEU*     3.7     7.0    -      -       -      +
    474A  THR*     1.3    74.5    -      -       -      +
    476A  MET*     1.3    80.5    +      -       +      +
    478A  GLN*     3.5     4.3    +      -       -      +
    479A  GLU*     3.2    29.0    +      -       -      +
    497A  PHE*     4.2    18.6    -      -       +      -
    539A  VAL*     3.8    20.0    -      -       +      -
    542A  ARG*     6.1     2.5    -      -       -      +
    543A  SER*     3.3    25.6    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 476 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    412A  LEU*     4.2    12.6    -      -       +      -
    415A  ILE*     4.0    21.8    -      -       +      -
    472A  LEU*     2.9    39.8    +      -       +      +
    473A  GLU      3.9     3.1    -      -       -      +
    475A  VAL*     1.3   106.2    -      -       +      +
    477A  VAL*     1.3    63.1    +      -       -      +
    479A  GLU*     3.3    16.2    +      -       -      +
    482A  ARG*     3.4    14.6    -      -       -      +
    488A  MET*     4.1     7.4    -      -       -      +
    491A  LEU*     3.9    28.0    -      -       +      +
    492A  LEU*     3.6    35.9    -      -       +      -
    497A  PHE*     4.8     7.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 477 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    411A  GLN*     3.9    21.8    -      -       +      +
    415A  ILE*     4.1    15.9    -      -       +      -
    473A  GLU*     3.0    29.6    +      -       +      +
    474A  THR*     4.0     5.2    -      -       -      +
    476A  MET*     1.3    77.0    -      -       -      +
    478A  GLN*     1.3    65.6    +      -       +      +
    479A  GLU      3.2     3.0    +      -       -      +
    482A  ARG*     3.0    46.2    +      -       -      +
    483A  LEU*     4.2     1.7    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 478 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    474A  THR*     3.3    38.4    +      -       +      +
    475A  VAL*     3.5     4.5    +      -       -      +
    477A  VAL*     1.3    81.9    -      -       +      +
    479A  GLU*     1.3    64.9    +      -       -      +
    480A  THR*     3.6     1.9    +      -       -      -
    483A  LEU*     3.8    14.0    -      -       -      +
    542A  ARG*     5.1    11.6    +      -       -      +
    543A  SER*     4.8     8.7    +      -       -      +
----------------------------------------------------------
 Back to top of page


A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il