Contacts of the helix formed by residues 677 - 704 (chain A) in PDB entry 1H3N


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with THR 677 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    580A  TRP*     4.0    15.9    -      -       +      +
    663A  THR*     4.6     3.6    -      -       -      +
    675A  VAL*     3.3    29.2    +      -       +      +
    676A  TRP*     1.3    86.9    -      -       -      +
    678A  GLU*     1.3    63.7    +      -       -      +
    679A  GLU*     3.5    10.5    +      -       -      +
    680A  GLY*     3.1    22.6    +      -       -      -
    681A  VAL*     3.0    26.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 678 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    677A  THR*     1.3    71.2    -      -       -      +
    679A  GLU*     1.3    64.5    +      -       +      +
    681A  VAL*     3.1    16.0    +      -       -      +
    682A  GLN*     2.8    64.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 679 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    677A  THR*     3.2    10.4    +      -       -      +
    678A  GLU*     1.3    81.4    -      -       +      +
    680A  GLY*     1.3    57.4    +      -       -      +
    682A  GLN*     3.5    22.2    +      -       -      +
    683A  GLY*     2.9    23.7    +      -       -      -
    686A  ARG*     4.7    10.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 680 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    663A  THR*     3.6    22.2    +      -       -      +
    677A  THR*     3.1    19.0    +      -       -      -
    679A  GLU*     1.3    75.5    -      -       -      +
    681A  VAL*     1.3    64.8    +      -       -      +
    683A  GLY*     3.1     2.8    +      -       -      -
    684A  ALA*     3.0    18.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 681 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    651A  PHE*     3.9    28.7    -      -       +      -
    655A  GLN*     4.2     7.2    -      -       +      +
    659A  ILE*     3.9    17.7    -      -       +      -
    663A  THR*     3.4    12.3    -      -       +      +
    676A  TRP*     4.0    20.6    -      -       +      +
    677A  THR      3.0    15.4    +      -       -      +
    678A  GLU*     3.1    19.3    +      -       -      +
    680A  GLY*     1.3    75.8    -      -       -      +
    682A  GLN*     1.3    62.4    +      -       -      +
    684A  ALA*     3.1     4.9    +      -       -      +
    685A  TRP*     3.1    33.1    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 682 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    678A  GLU*     2.8    48.7    +      -       -      +
    679A  GLU*     3.7    22.4    +      -       -      +
    681A  VAL*     1.3    77.5    -      -       +      +
    683A  GLY*     1.3    56.9    +      -       -      +
    685A  TRP*     3.3    12.0    +      -       +      +
    686A  ARG*     3.0    47.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 683 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    662A  ILE*     5.5     0.2    -      -       -      -
    666A  PHE*     6.3     2.7    -      -       -      -
    679A  GLU      2.9    13.4    +      -       -      -
    680A  GLY*     3.1     4.9    +      -       -      -
    681A  VAL      3.1     0.6    -      -       -      -
    682A  GLN*     1.3    74.5    -      -       -      +
    684A  ALA*     1.3    64.3    +      -       -      +
    686A  ARG*     3.3    25.4    +      -       -      +
    687A  PHE*     3.1    23.4    +      -       -      +
    749A  MET*     5.2     4.3    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 684 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    659A  ILE*     3.4    33.4    -      -       +      +
    662A  ILE*     3.9    26.7    -      -       +      -
    663A  THR*     3.5     9.4    -      -       -      +
    680A  GLY      3.0     6.9    +      -       -      +
    681A  VAL      3.4     8.7    -      -       -      +
    683A  GLY*     1.3    77.9    -      -       -      +
    685A  TRP*     1.3    61.6    +      -       -      +
    687A  PHE*     3.3     3.4    +      -       -      +
    688A  LEU*     3.0    30.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TRP 685 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4A  TYR*     3.8    29.4    -      +       -      -
      6A  PRO*     3.8    18.8    -      -       +      -
      7A  HIS*     5.9     2.2    -      +       -      -
    654A  GLU      5.0     2.5    -      -       -      -
    655A  GLN*     2.6    37.1    +      -       -      -
    659A  ILE*     3.2    33.5    -      -       +      +
    681A  VAL*     3.1    31.3    +      -       +      -
    682A  GLN*     3.5    13.2    -      -       +      +
    683A  GLY      3.3     0.2    -      -       -      -
    684A  ALA*     1.3    77.9    -      -       -      +
    686A  ARG*     1.3    59.0    +      -       +      +
    688A  LEU*     3.8     3.0    -      -       -      +
    689A  ASN*     2.8    60.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 686 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    679A  GLU*     4.7    10.5    +      -       -      -
    682A  GLN*     3.0    43.6    +      -       +      +
    683A  GLY*     3.5    23.8    -      -       -      +
    684A  ALA      3.3     0.2    -      -       -      -
    685A  TRP*     1.3    75.8    -      -       +      +
    687A  PHE*     1.3    58.0    +      -       -      +
    689A  ASN*     3.8     8.1    -      -       -      +
    690A  ARG*     3.1    31.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 687 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    662A  ILE*     4.2    24.0    -      -       +      -
    683A  GLY      3.1    13.4    +      -       -      +
    684A  ALA*     3.7     7.6    -      -       -      +
    685A  TRP      3.2     0.2    -      -       -      -
    686A  ARG*     1.3    74.5    -      -       -      +
    688A  LEU*     1.3    71.7    +      -       +      +
    690A  ARG*     3.2     7.2    +      -       +      +
    691A  ILE*     3.1    37.5    +      -       +      +
    745A  ILE*     4.1    14.8    -      -       +      -
    748A  LEU*     4.2    12.8    -      -       +      -
    749A  MET*     3.6    50.3    -      -       +      -
    752A  LEU*     4.0    11.0    -      -       +      -
    775A  TYR*     3.4    26.7    -      +       -      -
    779A  LEU*     4.5     9.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 688 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4A  TYR*     3.7    36.1    -      -       +      +
    658A  ASP*     3.8     9.4    -      -       +      +
    659A  ILE*     3.8    35.0    -      -       +      +
    662A  ILE*     4.2    11.7    -      -       +      -
    684A  ALA      3.0    18.6    +      -       -      +
    685A  TRP      4.0     1.6    -      -       -      +
    687A  PHE*     1.3    78.2    -      -       +      +
    689A  ASN*     1.3    62.3    +      -       -      +
    691A  ILE*     3.3    14.7    +      -       +      +
    692A  TYR*     3.0    23.7    +      -       -      +
    783A  ALA*     4.0    21.5    -      -       +      -
    786A  LEU*     3.8    23.2    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 689 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3A  LYS*     5.3     8.8    -      -       +      +
      4A  TYR*     3.4    36.4    +      -       -      +
    685A  TRP*     2.8    46.2    +      -       -      +
    686A  ARG*     3.8     6.9    -      -       -      +
    688A  LEU*     1.3    72.7    -      -       -      +
    690A  ARG*     1.3    57.6    +      -       -      +
    692A  TYR*     3.5     2.1    +      -       -      +
    693A  ARG*     2.9    31.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 690 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    686A  ARG      3.1    19.8    +      -       -      +
    687A  PHE*     3.2     8.5    +      -       -      +
    689A  ASN*     1.3    75.3    -      -       -      +
    691A  ILE*     1.3    62.9    +      -       -      +
    693A  ARG*     4.4     3.8    -      -       -      +
    694A  ARG*     3.3    10.2    +      -       -      +
    752A  LEU*     3.7    15.2    -      -       +      +
    753A  ASN*     3.0    31.2    +      -       -      +
    756A  TYR*     2.7    79.4    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 691 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    687A  PHE*     3.1    47.7    +      -       +      +
    688A  LEU*     3.3    15.7    +      -       +      +
    690A  ARG*     1.3    73.3    -      -       -      +
    692A  TYR*     1.3    66.4    +      -       -      +
    694A  ARG*     3.3     3.8    +      -       -      +
    695A  VAL*     3.2    25.7    +      -       +      +
    752A  LEU*     3.7    23.8    -      -       +      -
    775A  TYR*     4.0    19.7    -      -       +      +
    776A  LEU*     5.1     1.1    -      -       +      -
    779A  LEU*     4.0    28.3    -      -       +      -
    786A  LEU*     4.3     5.6    -      -       +      -
    790A  LEU*     3.8    21.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 692 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2A  GLU*     2.9    56.3    +      -       +      +
      3A  LYS*     3.7    11.1    +      -       -      -
      4A  TYR*     3.6    35.9    -      +       +      -
      5A  ASN      5.1     1.3    -      -       -      -
    688A  LEU      3.0    13.6    +      -       -      +
    689A  ASN      3.7     4.0    -      -       -      +
    691A  ILE*     1.3    82.4    -      -       -      +
    693A  ARG*     1.3    60.4    +      -       -      +
    695A  VAL*     3.2     3.5    +      -       -      +
    696A  ALA*     2.8    33.9    +      -       +      -
    786A  LEU*     4.1    13.0    -      -       +      -
    789A  GLU*     5.7     4.0    -      -       +      -
    790A  LEU*     4.0    20.4    -      -       +      -
    793A  TRP*     3.7    26.2    -      +       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 693 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1A  MET*     3.5    26.3    -      -       +      +
    689A  ASN      2.9    18.6    +      -       -      +
    690A  ARG*     4.4     2.2    -      -       -      +
    692A  TYR*     1.3    81.2    -      -       +      +
    694A  ARG*     1.3    59.4    +      -       -      +
    697A  GLU*     3.0    47.8    +      -       -      +
    756A  TYR*     3.7    31.7    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 694 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    690A  ARG      3.3    16.0    +      -       -      +
    691A  ILE      3.6     4.9    -      -       -      +
    692A  TYR      3.3     0.6    -      -       -      -
    693A  ARG*     1.3    80.2    -      -       -      +
    695A  VAL*     1.3    64.4    +      -       +      +
    697A  GLU*     3.7    19.2    +      -       -      +
    698A  ASP*     3.0    52.2    +      -       -      +
    752A  LEU*     4.3    12.6    -      -       +      -
    755A  LEU*     4.6     6.7    -      -       +      -
    756A  TYR*     3.4    61.2    +      -       +      +
    759A  ARG*     3.7    29.1    -      -       -      +
    768A  TYR*     3.3    14.4    +      -       -      +
    772A  ILE*     4.9     7.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 695 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    691A  ILE*     3.5    17.0    -      -       +      +
    692A  TYR      3.2     6.5    +      -       -      +
    694A  ARG*     1.3    77.7    -      -       +      +
    696A  ALA*     1.3    59.9    +      -       -      +
    698A  ASP      3.2     2.9    +      -       -      -
    699A  ARG*     2.8    27.0    +      -       -      -
    702A  LEU*     4.2     7.8    -      -       +      +
    772A  ILE*     4.4    24.7    -      -       +      -
    776A  LEU*     5.1     4.0    -      -       +      -
    790A  LEU*     3.9    26.7    -      -       +      -
    793A  TRP*     3.8    12.1    -      -       +      -
    794A  PHE*     3.5    33.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 696 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1A  MET*     4.1    18.4    -      -       +      +
      2A  GLU*     3.9    20.9    -      -       -      +
    692A  TYR*     2.8    34.2    +      -       +      +
    693A  ARG      4.1     2.9    -      -       -      +
    695A  VAL*     1.3    72.2    -      -       -      +
    697A  GLU*     1.3    63.9    +      -       -      +
    698A  ASP      3.3     0.5    +      -       -      -
    699A  ARG*     3.3    15.9    +      -       -      +
    700A  GLU      5.0     0.2    +      -       -      -
    793A  TRP*     3.8    14.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 697 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1A  MET*     3.5    23.6    -      -       -      +
    693A  ARG*     3.0    36.3    +      -       +      +
    694A  ARG*     3.7    26.5    -      -       -      +
    695A  VAL      3.3     0.2    -      -       -      -
    696A  ALA*     1.3    77.9    -      -       -      +
    698A  ASP*     1.3    62.5    +      -       -      +
    699A  ARG      3.8     0.2    +      -       -      -
    700A  GLU*     5.1     2.8    +      -       -      +
    759A  ARG*     5.3     2.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 698 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    694A  ARG*     3.0    25.1    +      -       -      +
    695A  VAL      3.2     4.3    +      -       -      -
    697A  GLU*     1.3    79.6    -      -       -      +
    699A  ARG*     1.3    58.8    +      -       -      +
    700A  GLU      3.4     2.5    -      -       -      -
    701A  ALA*     3.3     6.1    +      -       -      +
    702A  LEU*     2.8    43.3    +      -       +      +
    759A  ARG*     2.8    41.0    +      -       -      -
    764A  VAL*     3.6    15.6    -      -       +      +
    768A  TYR*     2.7    26.9    +      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 699 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2A  GLU*     4.8     6.3    +      -       -      -
    695A  VAL      2.8    13.3    +      -       -      +
    696A  ALA*     3.3    17.5    +      -       -      +
    697A  GLU      3.5     0.4    -      -       -      -
    698A  ASP*     1.3    77.0    -      -       -      +
    700A  GLU*     1.3    64.1    +      -       -      +
    702A  LEU*     3.6     1.9    -      -       -      +
    703A  LEU*     3.0    42.0    +      -       +      +
    793A  TRP*     3.3    69.0    +      -       +      +
    794A  PHE*     3.9    19.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 700 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    696A  ALA      5.0     0.4    +      -       -      -
    697A  GLU      5.1     2.0    +      -       -      +
    698A  ASP      3.4     1.0    -      -       -      -
    699A  ARG*     1.3    79.4    -      -       -      +
    701A  ALA*     1.3    64.0    +      -       -      +
    703A  LEU*     3.3    18.5    +      -       +      +
    704A  GLU*     3.4    23.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 701 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    697A  GLU      5.7     0.2    +      -       -      -
    698A  ASP*     3.3     6.3    +      -       -      +
    700A  GLU*     1.3    78.6    -      -       -      +
    702A  LEU*     1.3    62.1    +      -       -      +
    704A  GLU*     3.0    25.9    +      -       -      +
    705A  THR*     2.8    21.4    +      -       -      +
    759A  ARG*     6.1     0.2    -      -       -      +
    764A  VAL*     3.7    30.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 702 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    695A  VAL*     4.2    11.4    -      -       +      +
    698A  ASP*     2.8    40.8    +      -       +      +
    700A  GLU      3.3     0.2    -      -       -      -
    701A  ALA*     1.3    71.2    -      -       -      +
    703A  LEU*     1.3    62.0    +      -       -      +
    705A  THR*     3.1    12.9    +      -       -      +
    764A  VAL*     3.7    22.2    -      -       +      +
    768A  TYR*     4.1     8.5    -      -       +      -
    769A  ARG*     2.9    57.5    +      -       +      +
    772A  ILE*     4.4    16.6    -      -       +      -
    794A  PHE*     3.6    37.9    -      -       +      -
    795A  TRP*     6.3     0.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 703 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    699A  ARG*     3.0    36.3    +      -       +      +
    700A  GLU*     3.5    11.9    -      -       -      +
    701A  ALA      3.2     0.2    -      -       -      -
    702A  LEU*     1.3    78.6    -      -       -      +
    704A  GLU*     1.3    58.0    +      -       -      +
    705A  THR      3.3     3.3    +      -       -      +
    769A  ARG*     4.3     6.5    +      -       -      +
    793A  TRP      3.6    22.2    -      -       -      +
    794A  PHE*     3.9    14.1    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 704 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    700A  GLU*     3.4    21.0    -      -       -      +
    701A  ALA*     3.0    25.4    -      -       -      +
    703A  LEU*     1.3    77.5    -      -       -      +
    705A  THR*     1.3    60.0    +      -       -      +
----------------------------------------------------------
 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