Contacts of the helix formed by residues 604 - 627 (chain A) in PDB entry 1IVS


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with THR 604 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    602A  THR*     3.3    14.4    -      -       -      +
    603A  PRO*     1.3    73.9    -      -       -      +
    605A  LEU*     1.3    65.0    +      -       -      +
    606A  ALA*     3.4     9.3    +      -       -      +
    607A  ASP*     2.9    38.0    +      -       -      +
    608A  ARG*     3.0    16.7    +      -       -      +
    656A  ALA*     4.6     8.9    -      -       +      +
    661A  ASN*     3.7     9.6    -      -       -      +
    663A  HIS*     4.1     0.8    +      -       -      -
    664A  THR*     3.1    25.2    +      -       -      +
    758A  ASN*     5.2     4.5    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 605 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    603A  PRO      4.4     0.2    +      -       -      -
    604A  THR*     1.3    71.9    -      -       -      +
    606A  ALA*     1.3    64.8    +      -       -      +
    608A  ARG*     3.3     8.6    +      -       -      +
    609A  PHE*     2.8    24.8    +      -       +      +
    715A  ALA*     4.3     9.9    -      -       +      +
    718A  ALA*     4.0    20.2    -      -       +      -
    719A  PHE*     3.4    47.1    -      -       +      +
    722A  LEU*     5.3     3.6    -      -       +      -
    754A  PRO*     4.6    13.0    -      -       +      -
    757A  GLU*     4.5    11.0    -      -       -      +
    758A  ASN*     3.4    38.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 606 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    604A  THR*     3.2     8.6    +      -       -      +
    605A  LEU*     1.3    80.5    -      -       -      +
    607A  ASP*     1.3    62.2    +      -       -      +
    609A  PHE*     3.3     3.9    +      -       -      +
    610A  MET      3.0    18.9    +      -       -      -
    649A  TYR*     3.2    21.1    -      -       +      -
    652A  ALA*     3.7    37.9    -      -       +      +
    653A  ALA*     5.4     0.7    -      -       -      -
    719A  PHE*     4.0    16.6    -      -       +      -
    758A  ASN*     5.0     1.4    +      -       -      -
    761A  VAL*     5.8     2.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 607 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    604A  THR*     2.9    31.0    +      -       -      +
    606A  ALA*     1.3    72.5    -      -       -      +
    608A  ARG*     1.3    64.9    +      -       -      +
    609A  PHE      2.8     4.8    +      -       -      -
    610A  MET*     2.9    13.3    +      -       -      +
    611A  ARG*     3.0    17.7    +      -       +      +
    649A  TYR*     2.4    34.1    +      -       -      +
    653A  ALA*     5.2     0.2    -      -       -      +
    663A  HIS*     2.7    38.6    +      -       +      -
    664A  THR*     3.0    29.4    +      -       -      +
    667A  THR*     3.9     8.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 608 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    603A  PRO*     3.8    34.8    -      -       +      +
    604A  THR      3.0    14.2    +      -       -      +
    605A  LEU*     3.8     9.0    -      -       -      +
    607A  ASP*     1.3    78.9    -      -       +      +
    609A  PHE*     1.3    58.7    +      -       -      +
    611A  ARG*     4.0    14.8    -      -       -      +
    612A  SER*     3.4    21.8    +      -       -      -
    663A  HIS*     4.9     8.8    +      -       +      -
    712A  ASP*     4.1    27.2    +      -       -      +
    715A  ALA*     4.4     9.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 609 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    605A  LEU*     2.8    18.0    +      -       +      +
    606A  ALA      3.3     8.3    -      -       -      +
    607A  ASP      2.8     0.8    +      -       -      -
    608A  ARG*     1.3    76.7    -      -       -      +
    610A  MET*     1.3    68.5    +      -       +      +
    612A  SER*     3.2     5.8    +      -       -      -
    613A  ARG*     2.9    54.7    +      -       +      +
    644A  GLU*     4.2    20.9    -      -       -      -
    648A  TRP*     5.0     0.9    -      -       +      -
    649A  TYR*     5.3     3.4    -      +       -      -
    715A  ALA*     4.7     7.4    -      -       -      +
    716A  GLU*     3.9    24.7    -      -       +      +
    719A  PHE*     3.5    60.1    -      +       +      -
    720A  GLU*     6.1     0.4    -      -       -      -
    723A  LYS*     4.2    16.8    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 610 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    606A  ALA      3.0     5.5    +      -       -      +
    607A  ASP      2.9     5.6    +      -       -      +
    609A  PHE*     1.3    76.5    -      -       +      +
    611A  ARG*     1.3    66.0    +      -       -      +
    613A  ARG*     3.7     9.1    -      -       +      -
    614A  LEU*     3.0    29.5    +      -       +      +
    640A  LEU*     4.1    28.5    -      -       +      -
    644A  GLU*     3.3    33.9    -      -       +      +
    645A  PHE*     3.9    21.8    -      -       +      -
    649A  TYR*     3.1    53.2    -      -       +      -
    671A  VAL*     4.0    16.6    -      -       +      -
    675A  LEU*     5.4     0.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 611 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    607A  ASP      3.0    14.9    +      -       -      +
    608A  ARG*     4.0    13.5    -      -       -      +
    610A  MET*     1.3    77.3    -      -       -      +
    612A  SER*     1.3    61.8    +      -       -      +
    614A  LEU*     3.1    21.2    +      -       -      +
    615A  SER*     3.3    11.3    +      -       -      -
    663A  HIS*     5.1     7.6    +      -       -      -
    666A  ARG*     4.4     7.5    -      -       -      +
    667A  THR*     3.4    46.0    +      -       +      +
    670A  GLU*     2.7    44.3    +      -       -      +
    671A  VAL*     4.4     8.9    -      -       +      +
    710A  GLY      6.1     0.4    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 612 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    608A  ARG      3.4    13.0    +      -       -      -
    609A  PHE      3.2     7.7    +      -       -      -
    611A  ARG*     1.3    74.7    -      -       -      +
    613A  ARG*     1.3    58.8    +      -       -      +
    614A  LEU      2.9    10.8    +      -       -      -
    615A  SER*     3.1    14.0    +      -       -      -
    616A  ARG*     3.2    12.3    +      -       -      +
    710A  GLY      5.1     0.7    -      -       -      -
    711A  ARG*     3.4    13.4    -      -       -      +
    712A  ASP*     2.7    33.5    +      -       -      -
    716A  GLU*     2.6    34.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 613 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    609A  PHE*     2.9    47.6    +      -       +      +
    610A  MET*     3.7    15.9    -      -       +      +
    611A  ARG      3.4     0.2    -      -       -      -
    612A  SER*     1.3    76.3    -      -       -      +
    614A  LEU*     1.3    56.2    +      -       -      +
    616A  ARG*     3.6    24.0    -      -       -      +
    617A  GLY*     3.4    16.1    +      -       -      +
    620A  GLU*     4.6     6.9    +      -       -      -
    636A  GLU      5.8     0.2    +      -       -      -
    639A  GLU*     4.9     6.9    -      -       -      +
    640A  LEU*     3.1    41.3    -      -       -      +
    644A  GLU*     3.2    35.7    +      -       +      +
    716A  GLU*     3.8    17.9    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 614 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    610A  MET*     3.0    14.5    +      -       +      +
    611A  ARG*     3.2    12.3    -      -       -      +
    612A  SER      2.9     0.6    -      -       -      -
    613A  ARG*     1.3    77.9    -      -       -      +
    615A  SER*     1.3    55.9    +      -       -      +
    616A  ARG      3.1     1.1    -      -       -      -
    617A  GLY*     2.8     3.3    +      -       -      -
    618A  VAL*     2.7    35.9    +      -       +      +
    640A  LEU*     3.6    27.1    -      -       +      -
    671A  VAL*     3.6    40.4    -      -       +      -
    674A  VAL*     3.9    31.0    -      -       +      -
    675A  LEU*     3.8    14.1    -      -       +      -
    678A  LEU*     4.7     2.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 615 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    611A  ARG      3.3     7.1    +      -       -      -
    612A  SER      3.1     6.4    +      -       -      -
    614A  LEU*     1.3    77.7    -      -       -      +
    616A  ARG*     1.3    67.2    +      -       -      +
    618A  VAL*     4.3     1.6    -      -       -      +
    619A  GLU*     2.8    31.2    +      -       -      +
    708A  PRO*     3.8    16.4    -      -       -      +
    709A  GLY*     3.0    23.8    +      -       -      +
    710A  GLY      2.7    36.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 616 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    612A  SER*     3.2    16.4    +      -       -      +
    613A  ARG*     3.6    29.4    -      -       -      +
    615A  SER*     1.3    80.5    -      -       -      +
    617A  GLY*     1.3    60.2    +      -       -      +
    619A  GLU*     3.8    10.7    +      -       -      +
    620A  GLU*     3.1    49.1    +      -       -      +
    710A  GLY      4.7     0.2    +      -       -      -
    711A  ARG*     3.3    36.0    -      -       -      +
    712A  ASP      5.0     1.0    +      -       -      +
    713A  GLU*     4.2    16.8    +      -       -      -
    716A  GLU*     3.1    34.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 617 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    613A  ARG*     3.4     8.5    +      -       -      -
    614A  LEU      2.8    10.6    +      -       -      -
    616A  ARG*     1.3    79.6    -      -       -      +
    618A  VAL*     1.3    63.6    +      -       -      -
    619A  GLU      3.3     0.2    +      -       -      -
    620A  GLU*     3.4     6.0    +      -       -      -
    621A  ILE*     2.8    36.4    +      -       -      +
    636A  GLU*     6.1     0.4    -      -       -      -
    640A  LEU*     4.4    17.9    -      -       -      -
    678A  LEU*     4.9     1.1    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 618 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    614A  LEU*     2.7    22.3    +      -       +      +
    615A  SER*     3.8     3.4    -      -       -      +
    617A  GLY*     1.3    70.5    -      -       -      +
    619A  GLU*     1.3    68.1    +      -       -      +
    621A  ILE*     4.2     0.2    -      -       -      +
    622A  THR*     2.8    32.0    +      -       -      +
    674A  VAL*     3.6    31.0    -      -       +      -
    678A  LEU*     3.9    17.6    -      -       +      +
    706A  PRO*     3.7    24.0    -      -       +      +
    707A  GLU      3.9     1.3    -      -       -      +
    708A  PRO*     3.4    39.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 619 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    615A  SER*     2.8    23.3    +      -       -      +
    616A  ARG*     3.8    11.3    +      -       -      +
    618A  VAL*     1.3    79.8    -      -       -      +
    620A  GLU*     1.3    67.8    +      -       +      +
    622A  THR*     3.0    11.0    +      -       -      -
    623A  ALA*     3.2    15.6    +      -       +      +
    708A  PRO*     4.2    17.7    -      -       +      +
    711A  ARG*     5.4     6.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 620 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    613A  ARG*     4.6     6.4    +      -       -      -
    616A  ARG*     3.1    40.2    +      -       +      +
    617A  GLY*     3.7     4.7    -      -       -      +
    619A  GLU*     1.3    83.6    -      -       +      +
    621A  ILE*     1.3    64.0    +      -       +      +
    623A  ALA*     3.5     6.6    +      -       -      +
    624A  LEU*     3.1    28.1    +      -       +      +
    636A  GLU*     2.9    40.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 621 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    617A  GLY*     2.8    27.3    +      -       -      +
    618A  VAL      4.2     1.6    -      -       -      +
    620A  GLU*     1.3    70.7    -      -       +      +
    622A  THR*     1.3    67.0    +      -       -      +
    624A  LEU*     3.1     9.6    +      -       -      +
    625A  TYR*     3.0    45.2    +      -       +      -
    633A  ALA*     4.1     9.4    -      -       +      +
    636A  GLU*     4.7    17.3    -      -       +      +
    637A  VAL*     3.7    39.9    -      -       +      -
    640A  LEU*     4.8     4.5    -      -       +      -
    678A  LEU*     4.0    32.3    -      -       +      +
    705A  TRP*     4.7     0.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 622 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  TYR*     3.3    21.5    -      -       -      +
     70A  ARG*     3.4    20.6    -      -       -      +
    618A  VAL*     2.8    28.7    +      -       -      +
    619A  GLU*     3.6     3.5    -      -       -      -
    621A  ILE*     1.3    75.7    -      -       -      +
    623A  ALA*     1.3    53.3    +      -       -      +
    625A  TYR*     2.6    30.3    +      -       -      +
    626A  GLU*     2.7    20.5    +      -       +      -
    678A  LEU*     5.3     0.2    -      -       -      +
    705A  TRP*     3.0    27.5    +      -       +      +
    706A  PRO      4.8     0.2    +      -       -      -
    708A  PRO*     5.6     0.7    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 623 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    619A  GLU*     3.2    10.5    +      -       +      +
    620A  GLU*     3.7    10.3    -      -       -      +
    622A  THR*     1.3    79.8    -      -       -      +
    624A  LEU*     1.3    59.4    +      -       +      +
    626A  GLU*     3.1    12.9    +      -       -      +
    627A  ALA*     2.9    28.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 624 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    620A  GLU*     3.1    17.8    +      -       +      +
    621A  ILE*     3.3    11.9    -      -       -      +
    622A  THR      3.0     0.6    -      -       -      -
    623A  ALA*     1.3    76.2    -      -       +      +
    625A  TYR*     1.3    62.7    +      -       -      +
    627A  ALA*     3.3     7.6    +      -       +      -
    629A  ASP*     2.9    43.7    +      -       +      +
    632A  GLN*     3.5    28.9    -      -       +      -
    633A  ALA*     3.2    39.7    -      -       +      +
    636A  GLU*     3.8    17.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 625 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62A  ALA*     4.0     5.6    -      -       +      -
     63A  LEU*     5.0     3.7    -      -       +      +
     66A  TYR*     3.7    44.8    -      +       +      -
    621A  ILE*     3.0    44.1    +      -       +      -
    622A  THR      2.6    13.4    +      -       -      +
    624A  LEU*     1.3    71.9    -      -       -      +
    626A  GLU*     1.3    57.3    +      -       -      +
    628A  LEU*     2.8    28.1    +      -       -      +
    630A  LEU*     3.4    29.2    -      -       +      +
    633A  ALA*     4.0    11.4    -      -       +      -
    678A  LEU      3.8     6.6    +      -       -      -
    681A  PRO*     3.2    38.1    -      -       +      +
    682A  MET*     3.7    27.2    -      -       +      +
    705A  TRP*     4.2    13.5    -      +       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 626 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  TYR*     2.6    29.9    +      -       -      +
     67A  LYS*     4.0    12.6    +      -       -      -
     70A  ARG*     3.1    10.7    +      -       -      +
    622A  THR*     2.7    22.9    +      -       +      +
    623A  ALA*     3.2    16.2    -      -       -      +
    625A  TYR*     1.3    78.2    -      -       -      +
    627A  ALA*     1.3    54.4    +      -       -      +
    628A  LEU*     3.2     6.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 627 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    382A  VAL*     5.5     1.2    -      -       -      +
    623A  ALA      2.9    14.0    +      -       -      +
    624A  LEU*     3.3     8.5    +      -       +      +
    625A  TYR      3.1     0.6    -      -       -      -
    626A  GLU*     1.3    76.0    -      -       -      +
    628A  LEU*     1.3    72.4    +      -       -      +
    629A  ASP*     3.0    11.7    +      -       +      +
----------------------------------------------------------
 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