Contacts of the helix formed by residues 785 - 814 (chain A) in PDB entry 2XT6


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 785 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    779A  ILE*     3.5     5.9    -      -       -      +
    784A  ILE*     1.3    74.5    -      -       -      +
    786A  MET*     1.3    66.5    +      -       -      +
    787A  LYS*     3.2     9.6    -      -       -      -
    788A  GLU*     2.9    23.3    +      -       -      -
    789A  ALA      3.0    18.0    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 786 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    779A  ILE*     3.8    36.8    -      -       +      +
    785A  SER*     1.3    72.8    -      -       -      +
    787A  LYS*     1.4    51.7    +      -       -      +
    789A  ALA*     3.3     5.5    +      -       -      +
    790A  GLU*     2.8    52.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 787 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    785A  SER*     3.2     7.0    -      -       -      -
    786A  MET*     1.4    74.2    -      -       -      +
    788A  GLU*     1.4    59.6    +      -       +      +
    790A  GLU*     3.1    14.9    +      -       -      +
    791A  ASP*     2.9    38.1    +      -       -      +
    794A  ARG*     4.6     0.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 788 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    476A  VAL*     4.4    12.3    -      -       -      +
    783A  ASP      4.1     3.4    -      -       -      +
    784A  ILE*     3.2    26.8    -      -       +      +
    785A  SER*     2.9    40.3    +      -       -      +
    787A  LYS*     1.4    77.1    -      -       +      +
    789A  ALA*     1.4    56.6    +      -       -      +
    791A  ASP*     3.6    13.7    -      -       -      +
    792A  ALA*     3.3    21.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 789 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    775A  THR*     4.0    13.9    -      -       +      +
    779A  ILE*     3.2    33.9    -      -       +      -
    784A  ILE*     3.8    11.6    -      -       +      +
    785A  SER      3.0     5.1    +      -       -      -
    786A  MET*     3.5     9.2    -      -       -      +
    787A  LYS      3.2     0.2    -      -       -      -
    788A  GLU*     1.4    75.2    -      -       -      +
    790A  GLU*     1.4    60.1    +      -       +      +
    791A  ASP      3.2     0.4    -      -       -      -
    792A  ALA*     3.1     8.8    +      -       -      +
    793A  LEU*     3.0    26.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 790 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    786A  MET*     2.8    34.0    +      -       +      +
    787A  LYS*     3.1    14.1    +      -       -      +
    789A  ALA*     1.4    75.8    -      -       +      +
    791A  ASP*     1.4    56.3    +      -       -      +
    793A  LEU*     3.3    10.0    +      -       +      +
    794A  ARG*     2.9    54.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 791 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    787A  LYS*     2.9    25.4    +      -       -      +
    788A  GLU*     3.6    14.1    -      -       -      +
    790A  GLU*     1.4    74.2    -      -       -      +
    792A  ALA*     1.4    51.6    +      -       -      +
    794A  ARG*     2.6    32.5    +      -       -      +
    795A  ASP*     2.8    33.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 792 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    483A  LEU*     3.8    30.5    -      -       +      -
    487A  ASN*     2.8    29.9    +      -       -      +
    771A  ARG*     5.7     0.7    -      -       -      -
    775A  THR*     4.7     6.3    -      -       +      +
    784A  ILE*     5.6     0.2    -      -       +      -
    788A  GLU      3.3    10.3    +      -       -      +
    789A  ALA*     3.1    14.5    +      -       -      +
    791A  ASP*     1.4    76.5    -      -       -      +
    793A  LEU*     1.4    59.0    +      -       -      +
    795A  ASP*     3.4     2.9    +      -       -      -
    796A  TYR*     3.0    12.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 793 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    771A  ARG*     3.9    26.0    -      -       -      +
    789A  ALA      3.0    11.3    +      -       -      +
    790A  GLU*     3.3    11.0    +      -       +      +
    792A  ALA*     1.4    72.8    -      -       -      +
    794A  ARG*     1.3    60.3    +      -       -      +
    796A  TYR*     3.4    13.8    +      -       +      +
    797A  GLN*     3.1    48.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 794 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    790A  GLU*     2.9    45.8    +      -       -      +
    791A  ASP*     2.6    51.3    +      -       -      +
    792A  ALA      3.3     0.2    -      -       -      -
    793A  LEU*     1.3    75.9    -      -       -      +
    795A  ASP*     1.4    55.2    +      -       -      +
    797A  GLN*     3.5    14.8    +      -       -      +
    798A  GLY*     3.0    24.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 795 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    484A  SER*     4.1    14.7    -      -       -      -
    487A  ASN*     2.8    27.1    +      -       -      +
    791A  ASP      2.8    18.9    +      -       -      +
    792A  ALA*     3.5     8.5    -      -       -      +
    794A  ARG*     1.4    70.3    -      -       -      +
    796A  TYR*     1.3    64.1    +      -       -      +
    798A  GLY*     3.1     2.9    +      -       -      -
    799A  GLN*     2.9    42.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 796 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    487A  ASN*     3.4    32.6    -      -       -      +
    490A  GLU*     3.8    10.9    -      -       +      +
    491A  ALA*     3.4    25.5    -      -       +      +
    494A  THR*     3.0    25.5    +      -       -      +
    771A  ARG*     3.7    40.6    -      -       -      +
    792A  ALA      3.0    14.8    +      -       -      +
    793A  LEU*     3.7    11.4    -      -       +      +
    795A  ASP*     1.3    76.2    -      -       -      +
    797A  GLN*     1.3    69.5    +      -       +      +
    799A  GLN*     3.4     3.8    +      -       -      +
    800A  LEU*     3.0    54.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 797 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    793A  LEU*     3.1    42.4    +      -       +      +
    794A  ARG*     3.6    18.7    -      -       -      +
    796A  TYR*     1.3    83.2    -      -       +      +
    798A  GLY*     1.3    58.9    +      -       -      +
    800A  LEU*     3.4     7.2    +      -       +      +
    801A  GLU*     2.8    43.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 798 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    794A  ARG      3.0    15.6    +      -       -      -
    795A  ASP*     3.1     4.7    +      -       -      -
    797A  GLN*     1.3    74.3    -      -       -      +
    799A  GLN*     1.3    57.3    +      -       -      +
    801A  GLU*     3.2    14.5    +      -       -      +
    802A  ARG*     2.9    32.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 799 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    484A  SER*     3.8    12.1    +      -       -      +
    487A  ASN      4.6     1.3    -      -       -      +
    488A  ALA*     3.5    31.8    -      -       -      +
    491A  ALA*     3.8    16.6    -      -       +      +
    554A  TYR*     4.9     2.1    +      -       -      +
    795A  ASP*     2.9    35.9    +      -       -      +
    796A  TYR*     3.5     9.6    -      -       -      +
    798A  GLY*     1.3    74.3    -      -       -      +
    800A  LEU*     1.4    60.6    +      -       -      +
    802A  ARG*     2.8    42.0    +      -       -      +
    803A  VAL*     3.2    25.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 800 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    491A  ALA*     3.3    29.5    -      -       +      +
    494A  THR*     3.8    19.3    -      -       +      -
    495A  PHE*     3.9     3.8    -      -       +      +
    796A  TYR*     3.0    46.7    +      -       +      +
    797A  GLN*     3.7     7.6    -      -       +      +
    799A  GLN*     1.4    73.4    -      -       -      +
    801A  GLU*     1.3    61.8    +      -       -      +
    803A  VAL*     3.2    10.1    -      -       -      +
    804A  PHE*     3.1    51.6    +      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 801 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    797A  GLN*     2.8    30.8    +      -       +      +
    798A  GLY*     3.2    11.0    +      -       -      +
    800A  LEU*     1.3    73.3    -      -       -      +
    802A  ARG*     1.4    59.9    +      -       -      +
    804A  PHE*     3.1     8.9    +      -       -      +
    805A  ASN*     2.8    37.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 802 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    554A  TYR*     3.4    38.1    +      -       -      -
    798A  GLY      2.9    26.4    +      -       -      +
    799A  GLN*     2.8    41.3    +      -       -      +
    801A  GLU*     1.4    69.4    -      -       -      +
    803A  VAL*     1.3    58.9    +      -       -      +
    805A  ASN*     4.1     7.4    -      -       +      -
    806A  GLU*     2.8    56.8    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 803 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    491A  ALA*     4.5     6.7    -      -       +      +
    492A  PHE*     4.4     7.0    -      -       +      -
    495A  PHE*     3.6    46.9    -      -       +      -
    554A  TYR*     3.6    44.9    -      -       +      +
    799A  GLN      3.2    14.7    +      -       -      +
    800A  LEU*     3.2    25.1    -      -       +      +
    802A  ARG*     1.3    77.8    -      -       -      +
    804A  PHE*     1.3    61.0    +      -       -      +
    807A  VAL*     3.2    31.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 804 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    494A  THR*     5.3     1.1    -      -       +      -
    495A  PHE*     3.6    33.2    -      +       -      -
    498A  THR*     3.7    32.8    -      -       +      -
    499A  LYS*     4.0    23.7    +      -       +      -
    800A  LEU*     3.1    47.1    +      -       +      -
    801A  GLU*     3.1     9.9    +      -       -      +
    803A  VAL*     1.3    76.7    -      -       -      +
    805A  ASN*     1.3    55.9    +      -       -      +
    807A  VAL*     4.0     1.4    -      -       -      +
    808A  ARG*     3.0    47.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 805 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    801A  GLU*     2.8    23.9    +      -       -      +
    802A  ARG*     3.9     8.7    -      -       +      +
    803A  VAL      3.4     0.2    -      -       -      -
    804A  PHE*     1.3    73.7    -      -       -      +
    806A  GLU*     1.4    64.5    +      -       +      +
    808A  ARG*     3.2    36.6    +      -       -      +
    809A  GLU*     3.4    31.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 806 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    553A  PRO*     5.1     4.3    -      -       -      +
    554A  TYR*     3.3    44.5    +      -       +      +
    555A  SER*     4.8     7.4    +      -       -      +
    802A  ARG*     2.8    48.6    +      -       +      +
    805A  ASN*     1.4    73.6    -      -       +      +
    807A  VAL*     1.3    63.2    +      -       -      +
    809A  GLU*     3.5     8.7    +      -       -      +
    810A  LEU*     3.3    21.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 807 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    495A  PHE*     3.6    16.6    -      -       +      -
    499A  LYS*     3.7    15.5    -      -       -      +
    500A  TYR*     3.5    24.9    -      -       -      +
    554A  TYR*     4.1    11.2    -      -       +      +
    558A  PHE*     3.5    37.7    -      -       +      +
    803A  VAL*     3.2    19.5    +      -       +      +
    804A  PHE      4.3     0.7    -      -       -      +
    806A  GLU*     1.3    74.3    -      -       -      +
    808A  ARG*     1.4    64.7    +      -       -      +
    810A  LEU*     3.6    10.9    +      -       +      +
    811A  GLU*     3.2    26.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 808 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    499A  LYS*     4.4     4.9    -      -       -      +
    804A  PHE*     3.0    27.8    +      -       -      +
    805A  ASN*     3.2    57.4    +      -       -      +
    806A  GLU      3.3     0.4    -      -       -      -
    807A  VAL*     1.4    76.6    -      -       -      +
    809A  GLU*     1.4    64.3    +      -       +      +
    811A  GLU*     3.4    23.5    +      -       -      +
    812A  LYS*     3.4    10.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 809 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    805A  ASN*     3.4    18.5    +      -       -      +
    806A  GLU*     3.7     9.9    -      -       -      +
    807A  VAL      3.4     0.2    -      -       -      -
    808A  ARG*     1.4    75.7    +      -       -      +
    810A  LEU*     1.3    64.0    +      -       -      +
    812A  LYS*     3.2    19.2    +      -       -      +
    813A  HIS*     3.2    13.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 810 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    554A  TYR      4.1     5.6    -      -       -      +
    555A  SER*     3.7    33.2    -      -       -      +
    558A  PHE*     3.3    42.4    -      -       +      +
    559A  SER*     4.1    10.8    -      -       -      -
    806A  GLU      3.3    12.4    +      -       -      +
    807A  VAL*     3.7    13.0    -      -       +      +
    808A  ARG      3.4     0.2    -      -       -      -
    809A  GLU*     1.3    77.5    -      -       -      +
    811A  GLU*     1.3    58.8    +      -       +      +
    813A  HIS*     4.5     6.1    -      -       +      +
    814A  GLU*     2.8    50.8    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 811 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    499A  LYS*     3.2    38.4    +      -       -      -
    500A  TYR*     4.1    12.9    +      -       -      +
    807A  VAL*     3.2    16.5    +      -       +      +
    808A  ARG*     3.5    15.6    -      -       -      +
    809A  GLU      3.2     0.2    -      -       -      -
    810A  LEU*     1.3    78.3    -      -       +      +
    812A  LYS*     1.4    58.9    +      -       -      +
    814A  GLU*     3.8    16.3    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 812 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    808A  ARG      3.4     8.5    +      -       -      +
    809A  GLU*     3.2    15.6    +      -       -      +
    811A  GLU*     1.4    76.8    -      -       -      +
    813A  HIS*     1.4    63.9    +      -       -      +
    814A  GLU      4.3     1.7    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 813 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    809A  GLU      3.2    11.9    +      -       -      +
    810A  LEU*     3.9     9.9    -      -       +      +
    812A  LYS*     1.4    78.4    -      -       -      +
    814A  GLU*     1.4    63.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 814 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    559A  SER*     5.5     1.3    -      -       -      -
    560A  GLU*     3.4    31.2    -      -       +      +
    810A  LEU*     2.8    36.0    +      -       +      +
    811A  GLU*     3.8    18.0    -      -       -      +
    812A  LYS      4.3     1.7    -      -       -      +
    813A  HIS*     1.4    77.7    -      -       -      +
----------------------------------------------------------
 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