Contacts of the helix formed by residues 703 - 732 (chain A) in PDB entry 3TE3


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 703 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    701A  TRP*     5.5     1.1    -      -       -      -
    702A  VAL*     1.3    85.8    -      -       -      +
    704A  GLY*     1.3    55.9    +      -       -      +
    705A  GLU*     3.1     7.4    -      -       -      +
    706A  GLU*     2.7    43.6    +      -       -      +
    707A  PHE      3.1     3.1    +      -       -      -
    701C  TRP*     5.0     2.3    -      -       -      +
    702C  VAL*     4.5     0.2    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 704 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    702A  VAL      3.7     1.2    -      -       -      -
    703A  SER*     1.3    72.3    -      -       -      +
    705A  GLU*     1.3    56.7    +      -       -      +
    707A  PHE*     3.3     3.3    +      -       -      +
    708A  TYR*     2.9    26.7    +      -       -      +
    701C  TRP*     4.5    16.1    -      -       -      +
    702C  VAL*     3.4    24.9    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 705 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    703A  SER*     3.0     5.7    +      -       -      -
    704A  GLY*     1.3    75.2    -      -       -      +
    706A  GLU*     1.3    61.4    +      -       -      +
    708A  TYR*     3.2    14.0    +      -       +      +
    709A  MET*     2.9    43.0    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 706 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    702A  VAL      4.2     1.8    -      -       -      +
    703A  SER*     2.7    34.2    +      -       -      +
    705A  GLU*     1.3    77.8    -      -       +      +
    707A  PHE*     1.3    63.3    +      -       -      +
    709A  MET*     3.2    13.7    +      -       -      +
    710A  LEU*     3.0    17.7    +      -       -      +
    707B  PHE*     3.6    28.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 707 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    702A  VAL      5.3     1.3    -      -       -      +
    703A  SER      3.1     3.2    +      -       -      +
    704A  GLY      3.3     7.2    +      -       -      +
    706A  GLU*     1.3    78.5    -      -       -      +
    708A  TYR*     1.3    59.7    +      -       -      +
    710A  LEU*     3.1     3.1    +      -       -      +
    711A  THR*     2.9    41.9    +      -       -      -
    707B  PHE*     4.1    23.9    -      +       +      -
    710B  LEU*     5.2     0.4    -      -       +      -
    702C  VAL*     3.8    30.3    -      -       +      -
    706C  GLU*     3.4    54.3    -      -       +      -
    707C  PHE*     3.8    24.9    -      +       +      -
    709C  MET*     5.7     3.4    -      -       +      -
    710C  LEU*     3.5    29.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 708 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    704A  GLY      2.9    14.6    +      -       -      +
    705A  GLU*     3.2    15.5    +      -       +      +
    707A  PHE*     1.3    76.7    -      -       -      +
    709A  MET*     1.3    68.8    +      -       +      +
    711A  THR*     3.2    12.5    +      -       +      -
    712A  ARG*     3.0    64.0    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 709 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    705A  GLU*     2.9    36.9    +      -       +      +
    706A  GLU*     3.2    13.9    +      -       -      +
    708A  TYR*     1.3    83.5    -      -       +      +
    710A  LEU*     1.3    57.5    +      -       -      +
    712A  ARG*     3.4    20.2    +      -       -      +
    713A  ARG*     3.0    35.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 710 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    706A  GLU      3.0    12.5    +      -       -      +
    707A  PHE*     3.1     7.6    +      -       -      +
    709A  MET*     1.3    73.6    -      -       -      +
    711A  THR*     1.3    66.3    +      -       -      +
    713A  ARG*     3.1    27.1    +      -       +      +
    714A  VAL*     2.9    27.8    +      -       -      +
    707B  PHE*     3.4    30.1    -      -       +      -
    710B  LEU*     4.2    23.8    -      -       +      -
    711B  THR*     3.6    29.8    -      -       +      +
    714B  VAL*     4.3    22.9    -      -       +      -
    710C  LEU*     4.4    10.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 711 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    707A  PHE*     2.9    33.3    +      -       -      -
    708A  TYR*     3.4    17.7    -      -       +      -
    710A  LEU*     1.3    75.4    -      -       -      +
    712A  ARG*     1.3    64.2    +      -       +      +
    714A  VAL*     3.0     8.8    +      -       -      +
    715A  LEU*     2.9    23.2    +      -       +      +
    709C  MET*     6.3     2.5    -      -       +      -
    710C  LEU*     4.4    14.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 712 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    708A  TYR*     3.0    61.9    +      -       +      +
    709A  MET*     3.4    19.9    -      -       -      +
    711A  THR*     1.3    75.1    -      -       +      +
    713A  ARG*     1.3    65.4    -      -       +      +
    715A  LEU*     3.0    15.4    +      -       +      +
    716A  GLN*     2.9    47.8    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 713 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    709A  MET*     3.0    22.1    +      -       +      +
    710A  LEU*     3.1    30.8    +      -       -      +
    712A  ARG*     1.3    75.5    -      -       +      +
    714A  VAL*     1.3    57.6    +      -       -      +
    716A  GLN*     3.4    17.0    +      -       -      +
    717A  LEU*     2.9    29.5    +      -       -      +
    711B  THR*     4.4    16.8    +      -       -      +
    714B  VAL*     4.3    15.2    -      -       +      +
    715B  LEU*     4.4    13.5    -      -       -      +
    718B  GLU*     2.8    48.0    +      -       -      +
    729D  ASP*     4.8     8.8    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 714 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    710A  LEU      2.9    20.0    +      -       -      +
    711A  THR      3.0     6.7    +      -       -      +
    713A  ARG*     1.3    77.3    -      -       -      +
    715A  LEU*     1.3    56.8    +      -       -      +
    717A  LEU*     3.3    10.1    +      -       +      +
    718A  GLU*     2.9    32.6    +      -       -      +
    714B  VAL*     4.3    14.4    -      -       +      -
    710C  LEU*     3.8    31.9    -      -       +      -
    713C  ARG*     4.4    11.0    -      -       +      -
    714C  VAL*     4.1    17.9    -      -       +      -
    717C  LEU*     3.9    22.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 715 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    711A  THR*     2.9    15.4    +      -       +      +
    712A  ARG*     3.4    15.5    -      -       +      +
    714A  VAL*     1.3    73.8    -      -       -      +
    716A  GLN*     1.3    62.5    +      -       +      +
    718A  GLU*     3.3    17.3    +      -       +      +
    719A  THR*     2.6    42.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 716 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    712A  ARG*     2.9    46.0    +      -       +      +
    713A  ARG*     3.8    18.8    -      -       -      +
    715A  LEU*     1.3    75.4    -      -       +      +
    717A  LEU*     1.3    57.9    +      -       -      +
    719A  THR*     3.2     8.3    +      -       -      -
    720A  VAL*     2.9    37.0    +      -       +      +
    718B  GLU*     5.4     1.6    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 717 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    713A  ARG      2.9    17.1    +      -       -      +
    714A  VAL*     3.5     6.7    -      -       +      +
    716A  GLN*     1.3    74.4    -      -       -      +
    718A  GLU*     1.3    60.4    +      -       -      +
    720A  VAL*     4.6     2.0    -      -       -      -
    721A  LEU*     3.0    31.9    +      -       +      +
    714B  VAL*     4.6    16.2    -      -       +      +
    717B  LEU*     3.9    50.0    -      -       +      +
    718B  GLU*     4.2    12.8    -      -       +      -
    721B  LEU*     2.9    41.2    -      -       +      +
    714C  VAL*     6.1     0.2    -      -       +      -
    717C  LEU*     4.2    17.3    -      -       +      -
    721C  LEU*     5.6     2.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 718 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    714A  VAL*     2.9    21.4    +      -       -      +
    715A  LEU*     3.5    19.9    -      -       +      +
    717A  LEU*     1.3    76.2    -      -       -      +
    719A  THR*     1.3    57.6    +      -       -      +
    721A  LEU*     3.3     7.9    +      -       +      +
    722A  GLU*     2.9    29.7    +      -       -      +
    713C  ARG*     2.6    42.3    +      -       -      +
    717C  LEU*     3.6    23.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 719 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    715A  LEU*     2.6    30.9    +      -       -      +
    716A  GLN*     3.2    10.7    +      -       -      -
    718A  GLU*     1.3    73.5    -      -       -      +
    720A  VAL*     1.3    68.6    +      -       +      +
    722A  GLU*     3.0    19.6    +      -       -      +
    723A  GLY*     3.0    18.0    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 720 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    716A  GLN*     2.9    26.0    +      -       +      +
    717A  LEU*     3.9     4.3    -      -       -      +
    719A  THR*     1.3    72.8    -      -       +      +
    721A  LEU*     1.3    59.5    +      -       -      +
    723A  GLY*     3.0     4.9    +      -       -      -
    724A  VAL*     2.9    27.2    +      -       +      +
    721B  LEU*     3.5    26.0    -      -       +      -
    725B  VAL*     4.0    19.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 721 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    717A  LEU*     3.0    22.3    +      -       +      +
    718A  GLU*     3.3     7.0    -      -       +      +
    720A  VAL*     1.3    73.2    -      -       -      +
    722A  GLU*     1.3    64.9    -      -       -      +
    724A  VAL*     3.2    19.3    -      -       +      +
    725A  VAL*     2.9    32.6    +      -       +      +
    721B  LEU*     4.0     8.3    -      -       +      +
    717C  LEU*     4.0    31.2    -      -       +      +
    720C  VAL*     4.0    22.4    -      -       +      -
    721C  LEU*     3.9    27.6    -      -       +      -
    724C  VAL*     4.4    14.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 722 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    718A  GLU      2.9    11.8    +      -       -      +
    719A  THR*     3.2    21.0    -      -       -      +
    721A  LEU*     1.3    74.6    -      -       -      +
    723A  GLY*     1.3    63.2    +      -       -      +
    725A  VAL*     3.3     7.4    +      -       -      +
    726A  SER*     3.0    23.8    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 723 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    719A  THR      3.0    12.5    +      -       -      -
    720A  VAL*     3.0     5.6    +      -       -      -
    722A  GLU*     1.3    79.3    -      -       -      +
    724A  VAL*     1.3    56.1    +      -       -      +
    726A  SER*     3.0     9.5    -      -       -      -
    727A  GLN*     2.9    27.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 724 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    720A  VAL*     2.9    19.6    +      -       +      +
    721A  LEU*     3.2    27.8    -      -       +      +
    723A  GLY*     1.3    70.5    -      -       -      +
    725A  VAL*     1.3    70.5    +      -       -      +
    727A  GLN*     4.1     5.6    -      -       -      +
    728A  ILE*     2.9    30.6    +      -       +      +
    721B  LEU*     4.3     8.5    -      -       +      -
    724B  VAL*     4.3    12.6    -      -       +      -
    725B  VAL*     3.6    32.5    -      -       +      -
    728B  ILE*     4.9     9.0    -      -       +      -
    724C  VAL*     4.3    16.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 725 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    721A  LEU*     2.9    26.3    +      -       +      +
    722A  GLU*     3.6     9.0    -      -       -      +
    724A  VAL*     1.3    77.0    -      -       -      +
    726A  SER*     1.3    64.2    +      -       -      +
    728A  ILE*     4.0     6.5    -      -       -      +
    729A  ASP*     2.9    27.6    +      -       +      +
    720C  VAL*     5.6     3.6    -      -       +      -
    724C  VAL*     4.0    26.0    -      -       +      -
    727C  GLN*     5.5     7.4    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 726 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    722A  GLU*     3.0    13.7    +      -       -      -
    723A  GLY*     3.0    14.4    -      -       -      -
    725A  VAL*     1.3    76.7    -      -       -      +
    727A  GLN*     1.3    64.3    +      -       -      -
    729A  ASP*     3.0     7.3    +      -       -      +
    730A  ALA*     3.0    24.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 727 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    723A  GLY      2.9    18.3    +      -       -      +
    724A  VAL*     3.2     5.6    +      -       -      +
    726A  SER*     1.3    73.2    +      -       -      +
    728A  ILE*     1.3    57.2    +      -       -      +
    730A  ALA*     3.6     9.9    +      -       -      +
    731A  VAL*     2.9    34.0    +      -       +      +
    728B  ILE*     3.7    29.2    +      -       +      +
    729B  ASP*     5.8     3.2    +      -       -      +
    732B  GLY*     4.6    17.4    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 728 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    724A  VAL      2.9    21.0    +      -       -      +
    725A  VAL*     4.0     4.7    -      -       -      +
    727A  GLN*     1.3    74.5    -      -       -      +
    729A  ASP*     1.3    69.0    +      -       +      +
    731A  VAL*     2.9    14.5    +      -       -      +
    732A  GLY*     3.3     9.4    +      -       -      -
    724B  VAL*     4.4     4.7    -      -       +      -
    728B  ILE*     3.7    28.0    -      -       +      -
    724C  VAL*     4.1    22.9    -      -       +      +
    727C  GLN*     4.3    27.8    -      -       +      +
    728C  ILE*     3.3    33.7    -      -       +      +
    731C  VAL*     4.6    16.0    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 729 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    725A  VAL*     2.9    25.0    +      -       +      +
    726A  SER*     3.5     4.3    -      -       -      +
    728A  ILE*     1.3    80.0    -      -       -      +
    730A  ALA*     1.3    62.5    +      -       -      +
    732A  GLY*     3.7    10.6    +      -       -      +
    727C  GLN*     5.9     2.5    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 730 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    726A  SER      3.0    14.8    +      -       -      +
    727A  GLN*     3.9    13.9    -      -       -      +
    729A  ASP*     1.3    76.7    -      -       -      +
    731A  VAL*     1.3    65.2    +      -       -      +
    732A  GLY      3.1    11.6    +      -       -      +
    733A  SER      3.5     6.6    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 731 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    727A  GLN*     2.9    29.6    +      -       +      +
    728A  ILE*     2.9     9.9    +      -       -      +
    730A  ALA*     1.3    75.9    -      -       -      +
    732A  GLY*     1.3    65.9    +      -       -      +
    733A  SER*     2.9    12.3    +      -       -      +
    728B  ILE*     4.0    15.3    -      -       +      -
    731B  VAL*     4.3    15.9    -      -       +      +
    732B  GLY*     4.8    10.5    -      -       -      -
    731C  VAL*     3.5    33.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 732 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    728A  ILE      3.3     9.5    +      -       -      -
    729A  ASP      3.7     7.2    +      -       -      +
    730A  ALA      3.1     9.3    +      -       -      +
    731A  VAL*     1.3    74.9    -      -       -      +
    733A  SER*     1.3    70.6    +      -       -      +
    731C  VAL*     4.9     9.1    -      -       -      +
----------------------------------------------------------
 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