Contacts of the helix formed by residues 763 - 788 (chain A) in PDB entry 4N78


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 ASP 763 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    752A  GLN      3.8     0.7    -      -       -      +
    753A  ARG*     3.2    50.7    +      -       -      +
    761A  SER      3.9     3.0    +      -       -      -
    762A  ILE*     1.3    72.6    -      -       -      +
    764A  LEU*     1.3    63.5    +      -       -      +
    765A  ASN      3.1     5.4    +      -       -      -
    766A  ARG*     2.9    46.3    +      -       +      +
    767A  LEU*     3.3    14.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 764 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    665A  LEU*     4.7     6.3    -      -       +      -
    699A  PHE*     4.4    17.0    -      -       +      -
    702A  PHE*     4.1    22.7    -      -       +      -
    703A  VAL*     4.5    12.3    -      -       +      -
    706A  LEU*     4.0    19.1    -      -       +      -
    749A  LEU*     3.7    30.3    -      -       +      +
    752A  GLN*     3.2    23.9    +      -       +      +
    755A  VAL*     4.2     8.7    -      -       +      -
    762A  ILE*     3.3     9.0    +      -       +      -
    763A  ASP*     1.3    73.4    -      -       -      +
    765A  ASN*     1.3    62.5    +      -       -      +
    767A  LEU*     3.3     4.8    +      -       +      +
    768A  ILE*     3.0    46.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 765 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    749A  LEU      4.9     0.4    +      -       -      -
    750A  LEU      2.6    29.8    +      -       -      +
    752A  GLN      3.0     6.2    +      -       -      +
    753A  ARG*     3.4    38.8    +      -       -      +
    763A  ASP*     3.1     8.9    +      -       -      +
    764A  LEU*     1.3    76.7    -      -       -      +
    766A  ARG*     1.3    58.5    +      -       -      +
    768A  ILE*     3.4     6.0    +      -       -      +
    769A  THR*     2.7    40.9    +      -       -      -
    815A  TYR      3.2    23.0    +      -       -      -
    816A  LEU*     3.3    13.2    -      -       -      +
    817A  THR      5.3     1.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 766 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    753A  ARG*     5.5     2.0    -      -       -      +
    763A  ASP*     2.9    36.0    +      -       -      +
    765A  ASN*     1.3    80.1    +      -       -      +
    767A  LEU*     1.3    67.1    +      -       +      +
    769A  THR*     3.4     6.8    +      -       -      -
    770A  GLN*     3.2    52.1    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 767 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    699A  PHE*     3.9    18.6    -      -       +      -
    703A  VAL*     4.0    17.3    -      -       +      -
    762A  ILE*     3.7    29.8    -      -       +      -
    763A  ASP      3.3     8.8    +      -       -      +
    764A  LEU*     3.3     8.5    +      -       +      +
    766A  ARG*     1.3    80.8    -      -       +      +
    768A  ILE*     1.3    64.1    +      -       -      +
    770A  GLN*     3.3    18.9    +      -       -      +
    771A  ARG*     3.1    47.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 768 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    703A  VAL*     5.1     4.3    -      -       +      -
    706A  LEU*     3.8    28.3    -      -       +      -
    707A  ALA*     4.3    17.9    -      -       +      +
    710A  ILE*     3.8    11.7    -      -       +      -
    749A  LEU      4.6     5.8    -      -       -      +
    750A  LEU*     3.8    34.8    -      -       +      -
    764A  LEU*     3.0    37.8    +      -       +      +
    765A  ASN*     3.9     3.8    -      -       -      +
    767A  LEU*     1.3    73.0    -      -       +      +
    769A  THR*     1.3    62.2    +      -       -      +
    771A  ARG*     3.1     4.0    +      -       -      +
    772A  VAL*     2.8    44.9    +      -       +      +
    816A  LEU*     4.3     3.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 769 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    765A  ASN*     2.7    29.8    +      -       -      -
    766A  ARG*     3.6     7.4    -      -       -      -
    768A  ILE*     1.3    77.7    -      -       -      +
    770A  GLN*     1.3    56.7    +      -       -      +
    772A  VAL*     4.4     0.7    -      -       -      -
    773A  SER*     2.8    37.2    +      -       -      -
    816A  LEU*     3.4    26.0    -      -       +      +
    817A  THR*     3.3    30.8    +      -       -      +
    818A  LEU*     3.7    14.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 770 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    766A  ARG*     3.2    49.4    +      -       +      +
    767A  LEU*     3.4    15.7    -      -       -      +
    768A  ILE      3.2     0.4    -      -       -      -
    769A  THR*     1.3    78.9    -      -       -      +
    771A  ARG*     1.3    85.2    +      -       -      +
    773A  SER*     3.9     4.3    -      -       -      -
    774A  ALA*     3.3    20.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 771 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    700A  ASP*     5.5     8.1    +      -       -      +
    703A  VAL*     3.7    26.6    -      -       +      +
    704A  TYR*     5.3    11.9    -      -       +      +
    707A  ALA*     3.4    27.8    -      -       +      -
    767A  LEU*     3.1    30.1    +      -       -      +
    768A  ILE      3.1     3.1    +      -       -      +
    770A  GLN*     1.3   102.9    +      -       -      +
    772A  VAL*     1.3    60.1    +      -       -      +
    774A  ALA*     3.1     8.7    +      -       -      +
    775A  ALA*     3.0    26.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 772 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    707A  ALA*     4.3    16.8    -      -       +      +
    710A  ILE*     4.6     9.4    -      -       +      -
    711A  PHE*     4.1     9.6    -      -       +      -
    768A  ILE*     2.8    41.8    +      -       +      +
    769A  THR*     4.0     1.3    -      -       -      +
    771A  ARG*     1.3    71.8    -      -       -      +
    773A  SER*     1.3    63.1    +      -       -      +
    775A  ALA*     3.1     8.9    +      -       -      +
    776A  MET*     3.0    22.1    +      -       +      +
    812A  LEU*     3.5    35.9    -      -       +      -
    816A  LEU*     4.0    16.8    -      -       +      -
    818A  LEU*     4.5     8.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 773 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    769A  THR*     2.8    21.1    +      -       -      -
    770A  GLN*     3.9     5.4    -      -       -      -
    772A  VAL*     1.3    76.0    -      -       -      +
    774A  ALA*     1.3    63.2    +      -       -      +
    776A  MET*     3.2     6.8    +      -       -      +
    777A  TYR*     3.1    45.8    +      -       -      -
    818A  LEU*     4.0    19.0    -      -       -      +
    819A  ASP*     4.8     4.7    +      -       -      -
    824A  MET*     4.0     6.9    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 774 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    770A  GLN      3.3    11.9    +      -       -      +
    771A  ARG*     3.1    12.2    +      -       -      +
    773A  SER*     1.3    78.7    -      -       -      +
    775A  ALA*     1.3    60.3    +      -       -      +
    777A  TYR*     3.6     8.2    +      -       -      +
    778A  LYS*     3.2    22.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 775 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    711A  PHE*     3.6    37.2    -      -       +      -
    771A  ARG      3.0    12.6    +      -       -      +
    772A  VAL*     3.1    10.3    +      -       -      +
    774A  ALA*     1.3    76.0    -      -       -      +
    776A  MET*     1.3    59.2    +      -       -      +
    778A  LYS*     3.3     2.6    +      -       -      +
    779A  SER*     3.0    32.6    +      -       -      -
    887A  TYR*     4.0    17.6    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 776 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    711A  PHE*     3.7    21.3    -      -       +      -
    772A  VAL      3.0    15.4    +      -       -      +
    773A  SER*     3.5     9.0    -      -       -      +
    775A  ALA*     1.3    77.2    -      -       -      +
    777A  TYR*     1.3    55.9    +      -       -      +
    779A  SER*     3.3     3.6    +      -       -      -
    780A  LEU*     3.0    37.4    +      -       +      +
    805A  ASN*     3.6    32.1    -      -       +      +
    808A  THR*     4.0    17.3    -      -       -      -
    809A  HIS*     4.0    18.6    -      -       +      -
    812A  LEU*     4.2    11.9    -      -       +      -
    818A  LEU*     4.6    11.2    -      -       +      -
    821A  PHE*     4.3    12.8    -      -       +      -
    824A  MET*     3.8    21.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 777 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    773A  SER*     3.1    39.7    +      -       -      +
    774A  ALA*     4.0     7.0    -      -       -      +
    775A  ALA      3.3     0.2    -      -       -      -
    776A  MET*     1.3    78.4    -      -       -      +
    778A  LYS*     1.3    57.7    +      -       -      +
    780A  LEU*     3.8     4.8    -      -       +      +
    781A  GLU*     2.8    31.3    +      -       -      +
    819A  ASP*     2.8    26.5    +      -       -      +
    823A  ALA*     4.7     1.0    +      -       -      +
    824A  MET*     3.5    48.9    +      -       +      +
    827A  GLU*     3.1    40.0    +      -       +      -
    828A  ALA*     4.8     7.4    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 778 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    774A  ALA      3.2    17.6    +      -       -      +
    775A  ALA      3.3     4.7    +      -       -      +
    777A  TYR*     1.3    73.5    -      -       -      +
    779A  SER*     1.3    61.0    +      -       -      +
    781A  GLU*     3.7     7.7    -      -       +      +
    782A  LEU*     2.9    30.7    +      -       +      +
    883A  ALA*     4.6    13.6    -      -       -      +
    884A  GLN*     5.6     1.6    +      -       -      +
    887A  TYR*     3.6    47.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 779 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    711A  PHE*     3.2    22.5    -      -       -      -
    715A  LYS*     3.4     7.5    +      -       -      -
    775A  ALA      3.0    14.0    +      -       -      -
    776A  MET*     3.5     9.0    -      -       -      -
    778A  LYS*     1.3    77.4    -      -       -      +
    780A  LEU*     1.3    56.3    +      -       -      +
    782A  LEU*     3.3     3.5    +      -       -      +
    783A  ALA*     3.0    28.9    +      -       -      +
    801A  LEU*     5.7     0.2    -      -       -      +
    805A  ASN*     3.0    26.3    +      -       -      +
    887A  TYR*     3.7    25.8    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 780 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    776A  MET*     3.0    26.9    +      -       +      +
    777A  TYR*     3.8     5.6    -      -       -      +
    779A  SER*     1.3    76.6    -      -       -      +
    781A  GLU*     1.3    63.8    +      -       -      +
    783A  ALA*     3.3     5.0    +      -       -      +
    784A  ILE*     3.1    30.3    +      -       +      +
    802A  LEU*     4.1    18.4    -      -       +      -
    805A  ASN*     3.8    28.9    -      -       +      +
    821A  PHE*     4.0    18.2    -      -       +      -
    824A  MET*     3.6    44.4    -      -       +      +
    825A  PHE*     3.8     9.2    -      -       +      +
    828A  ALA*     3.8    14.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 781 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    777A  TYR      2.8    18.8    +      -       -      +
    778A  LYS*     3.7     9.2    -      -       +      +
    780A  LEU*     1.3    77.2    -      -       -      +
    782A  LEU*     1.3    58.3    +      -       -      +
    784A  ILE*     4.0     2.4    -      -       -      +
    785A  GLY*     3.0    24.6    +      -       -      -
    828A  ALA*     4.1    14.5    -      -       +      +
    830A  HIS*     4.6     4.7    +      -       -      -
    838A  ARG*     2.8    38.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 782 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    778A  LYS*     2.9    20.6    +      -       +      +
    779A  SER      3.5     4.9    -      -       -      +
    780A  LEU      3.2     0.2    -      -       -      -
    781A  GLU*     1.3    76.0    -      -       -      +
    783A  ALA*     1.3    59.8    +      -       -      +
    785A  GLY*     3.0     1.8    +      -       -      -
    786A  ARG*     2.8    42.1    +      -       +      +
    880A  GLN*     3.8    30.3    -      -       +      +
    881A  PRO      4.6     3.1    -      -       -      +
    882A  ASN*     5.4     0.7    -      -       -      -
    883A  ALA*     3.8    33.2    -      -       +      +
    887A  TYR*     3.5    25.1    -      -       +      +
    888A  LEU*     3.5    25.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 783 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    779A  SER      3.0    15.8    +      -       -      +
    780A  LEU      3.3     4.7    +      -       -      +
    782A  LEU*     1.3    77.7    -      -       -      +
    784A  ILE*     1.3    62.0    +      -       -      +
    786A  ARG*     3.4     5.9    +      -       -      +
    787A  PHE      3.3    14.6    +      -       -      -
    798A  LEU*     3.4    24.3    -      -       +      +
    801A  LEU*     3.5    37.5    -      -       +      +
    802A  LEU*     4.4    12.6    -      -       +      -
    805A  ASN*     4.5     3.6    -      -       -      +
    888A  LEU*     5.3     0.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 784 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    780A  LEU*     3.1    17.1    +      -       +      +
    781A  GLU      4.1     2.7    -      -       -      +
    783A  ALA*     1.3    74.3    -      -       -      +
    785A  GLY*     1.3    66.2    +      -       -      +
    787A  PHE*     3.2     6.2    +      -       +      +
    788A  GLU*     3.1    24.3    +      -       +      +
    798A  LEU*     4.2     9.4    -      -       +      -
    802A  LEU*     4.9     3.4    -      -       +      -
    825A  PHE*     4.4    15.0    -      -       +      -
    828A  ALA*     3.8    10.1    -      -       +      +
    829A  ASN*     3.6    42.6    -      -       +      +
    838A  ARG*     3.8    38.1    -      -       +      +
    839A  ILE*     4.5    17.7    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 785 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    781A  GLU*     3.0    18.3    +      -       -      -
    782A  LEU      3.0     3.1    +      -       -      -
    784A  ILE*     1.3    75.0    -      -       -      +
    786A  ARG*     1.3    65.2    +      -       -      +
    788A  GLU*     3.4    23.9    +      -       -      +
    789A  SER*     3.5    12.0    +      -       -      -
    838A  ARG*     4.1     4.0    -      -       -      +
    880A  GLN*     3.5    20.4    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 786 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    782A  LEU*     2.8    39.9    +      -       +      +
    783A  ALA*     3.5     9.6    -      -       -      +
    784A  ILE      3.2     0.2    -      -       -      -
    785A  GLY*     1.3    77.7    -      -       -      +
    787A  PHE*     1.3    62.0    +      -       -      +
    789A  SER*     2.8    23.2    +      -       -      -
    790A  GLU*     3.4    16.3    -      -       +      +
    797A  GLU*     3.9    21.3    +      -       -      +
    801A  LEU*     5.1     4.1    -      -       +      +
    880A  GLN*     4.1    20.4    +      -       +      +
    882A  ASN*     3.7    34.6    -      -       -      +
    888A  LEU*     4.1    28.2    -      -       +      +
    889A  HIS*     5.7     2.8    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 787 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    783A  ALA      3.3     6.1    +      -       -      +
    784A  ILE*     3.2    11.3    +      -       +      +
    786A  ARG*     1.3    78.7    -      -       -      +
    788A  GLU*     1.3    55.8    +      -       +      +
    789A  SER      3.0     1.3    +      -       -      -
    790A  GLU*     3.1    10.3    +      -       -      +
    791A  ASP      4.1     7.9    -      -       -      -
    792A  LEU*     4.3     9.0    -      -       +      -
    794A  SER*     3.4    21.8    -      -       -      -
    795A  ILE*     3.5    48.5    -      -       +      -
    798A  LEU*     3.6    28.5    -      -       +      -
    839A  ILE*     3.8    34.5    -      -       +      -
    842A  HIS*     2.7    57.7    +      +       +      -
    843A  VAL*     4.0     8.3    -      -       +      -
----------------------------------------------------------
 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
----------------------------------------------------------
    784A  ILE*     3.1    15.5    +      -       +      +
    785A  GLY*     3.7    10.7    -      -       -      +
    786A  ARG      3.2     0.6    -      -       -      -
    787A  PHE*     1.3    76.0    -      -       +      +
    789A  SER*     1.3    56.8    +      -       -      +
    790A  GLU      3.5     0.4    -      -       -      -
    838A  ARG*     2.7    59.8    +      -       -      +
    842A  HIS*     3.1    40.1    +      -       +      +
    877A  ARG*     4.5     4.9    -      -       -      +
----------------------------------------------------------
 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