Contacts of the helix formed by residues 469 - 491 (chain A) in PDB entry 1F4L


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 ARG 469 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    403A  ARG*     5.3     1.3    -      -       -      -
    458A  GLN*     6.2     0.4    -      -       -      +
    462A  VAL*     5.4     2.4    -      -       -      +
    463A  VAL*     3.7    40.8    -      -       +      +
    466A  GLN*     2.9    42.1    +      -       -      +
    467A  GLU*     2.7    38.2    +      -       -      +
    468A  GLY*     1.3    73.6    -      -       -      +
    470A  ASP*     1.3    64.4    +      -       -      +
    471A  ALA      3.2     2.2    -      -       -      -
    472A  ASP*     2.9    37.9    +      -       -      +
    473A  LEU*     2.9    20.2    +      -       -      +
    476A  ILE*     5.6     1.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 470 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    403A  ARG*     2.4    40.9    +      -       -      +
    404A  PHE*     3.1    31.5    -      -       +      -
    468A  GLY*     3.3     7.4    -      -       -      -
    469A  ARG*     1.3    77.1    +      -       -      +
    471A  ALA*     1.3    61.8    +      -       -      +
    473A  LEU*     3.2     1.6    +      -       -      +
    474A  GLN      2.9    19.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 471 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    404A  PHE*     5.4     0.2    -      -       -      -
    468A  GLY      4.8     4.4    +      -       -      +
    469A  ARG      3.2     0.4    -      -       -      -
    470A  ASP*     1.3    80.5    -      -       -      +
    472A  ASP*     1.3    60.5    +      -       -      +
    474A  GLN*     3.5     9.5    +      -       -      +
    475A  ALA*     3.0    28.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 472 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    463A  VAL*     3.9    11.4    -      -       +      -
    469A  ARG*     2.9    47.4    +      -       -      +
    471A  ALA*     1.3    81.3    -      -       -      +
    473A  LEU*     1.3    64.9    +      -       -      +
    475A  ALA*     3.1     7.3    +      -       -      +
    476A  ILE*     2.9    32.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 473 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    399A  PHE*     3.7    23.1    -      -       +      -
    403A  ARG*     3.4    44.0    -      -       -      +
    404A  PHE*     4.1     5.6    -      -       +      -
    460A  PRO*     3.9    27.1    -      -       +      +
    463A  VAL*     3.9     7.1    -      -       +      +
    464A  ALA*     4.0    15.7    -      -       +      +
    469A  ARG      2.9    13.6    +      -       -      +
    470A  ASP*     3.2     9.4    +      -       -      +
    472A  ASP*     1.3    78.5    -      -       -      +
    474A  GLN*     1.3    64.7    +      -       -      +
    476A  ILE*     3.3     3.0    +      -       +      +
    477A  CYS*     3.0    49.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 474 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    400A  ILE*     5.0     2.4    -      -       +      +
    404A  PHE*     3.7    44.3    -      -       +      +
    407A  VAL*     2.9    31.2    +      -       -      +
    408A  LEU      3.7     3.4    +      -       -      -
    409A  ALA*     3.7    21.3    -      -       -      +
    470A  ASP      2.9    10.6    +      -       -      +
    471A  ALA*     3.9     7.1    -      -       -      +
    473A  LEU*     1.3    77.4    -      -       -      +
    475A  ALA*     1.3    61.6    +      -       -      +
    477A  CYS*     4.8     2.5    -      -       -      -
    478A  SER*     2.7    40.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 475 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    409A  ALA*     4.4    14.1    -      -       +      +
    411A  GLU      5.6     1.7    -      -       -      +
    413A  ALA*     3.9    23.0    +      -       +      +
    471A  ALA      3.0    17.9    +      -       -      +
    472A  ASP*     3.1     7.6    +      -       -      +
    474A  GLN*     1.3    77.7    -      -       -      +
    476A  ILE*     1.3    62.9    +      -       +      +
    478A  SER*     3.8     1.6    -      -       -      -
    479A  MET*     3.0    24.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 476 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    396A  ASN*     4.6     1.6    -      -       -      +
    413A  ALA*     5.8     0.7    -      -       +      -
    454A  TYR*     3.9    16.1    -      -       +      +
    455A  VAL*     5.0     6.4    -      -       +      +
    458A  GLN*     3.5    59.2    -      -       +      +
    460A  PRO*     3.9    27.4    -      -       +      -
    463A  VAL*     3.9    20.0    -      -       +      -
    469A  ARG*     5.6     1.3    -      -       -      +
    472A  ASP*     2.9    26.4    +      -       +      +
    473A  LEU*     3.8     4.7    -      -       -      +
    475A  ALA*     1.3    76.5    -      -       +      +
    477A  CYS*     1.3    59.6    +      -       -      +
    479A  MET*     3.3     4.0    +      -       -      +
    480A  GLY*     3.0    24.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with CYS 477 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    396A  ASN*     3.6    36.4    -      -       -      +
    399A  PHE*     3.7    24.7    -      -       +      -
    400A  ILE*     3.8    14.4    -      -       +      -
    404A  PHE*     6.1     0.2    -      -       +      -
    460A  PRO*     4.5     5.8    -      -       -      -
    473A  LEU*     3.0    41.8    +      -       -      +
    474A  GLN*     4.2     1.3    -      -       -      +
    476A  ILE*     1.3    74.3    -      -       -      +
    478A  SER*     1.3    66.1    +      -       -      +
    480A  GLY      3.3     1.0    +      -       -      -
    481A  ILE*     3.1    27.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 478 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    400A  ILE*     3.8     3.1    -      -       -      +
    408A  LEU*     3.4    27.3    -      -       -      +
    409A  ALA*     2.9    36.2    +      -       -      -
    411A  GLU      5.6     1.1    -      -       -      -
    474A  GLN*     2.7    24.3    +      -       -      +
    475A  ALA      3.8     3.1    -      -       -      -
    477A  CYS*     1.3    77.1    -      -       -      +
    479A  MET*     1.3    58.1    +      -       -      +
    481A  ILE*     3.3     2.9    +      -       -      +
    482A  ASN*     2.9    38.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 479 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    412A  LEU*     3.9    16.6    -      -       -      +
    413A  ALA*     3.8    12.1    -      -       +      +
    414A  ASP*     3.2    44.9    -      -       +      +
    417A  LEU*     4.2     4.9    -      -       +      -
    418A  TYR*     3.9    16.4    -      -       +      +
    454A  TYR*     3.5    32.1    -      -       +      +
    475A  ALA      3.0    17.8    +      -       -      +
    476A  ILE      3.4     5.6    -      -       -      +
    477A  CYS      3.2     0.2    -      -       -      -
    478A  SER*     1.3    77.0    -      -       -      +
    480A  GLY*     1.3    61.6    +      -       -      +
    482A  ASN*     3.1     6.1    +      -       -      +
    483A  LEU*     3.0    55.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 480 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    392A  LEU*     4.0     9.6    -      -       -      +
    396A  ASN*     3.7    23.3    -      -       -      -
    454A  TYR*     4.6     1.2    -      -       -      -
    455A  VAL*     4.5    12.6    -      -       -      -
    476A  ILE      3.0    12.7    +      -       -      -
    477A  CYS      3.3     0.6    +      -       -      -
    479A  MET*     1.3    75.0    -      -       -      +
    481A  ILE*     1.3    56.6    +      -       -      +
    483A  LEU*     3.2    11.7    +      -       -      +
    484A  PHE*     3.0    26.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 481 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    392A  LEU      4.5     3.8    -      -       -      +
    393A  ALA*     4.8     2.0    -      -       -      -
    396A  ASN*     3.8    18.4    -      -       +      -
    397A  ALA*     4.0    13.5    -      -       -      +
    400A  ILE*     2.9    39.3    -      -       +      -
    408A  LEU*     3.9    21.5    -      -       +      -
    477A  CYS      3.1    14.1    +      -       -      +
    478A  SER      3.7     4.0    -      -       -      +
    480A  GLY*     1.3    75.0    -      -       -      +
    482A  ASN*     1.3    57.8    +      -       -      +
    484A  PHE*     3.3     9.3    -      -       +      +
    485A  ARG*     3.0    25.6    +      -       -      +
    505A  PHE*     4.2    19.3    -      -       +      -
    506A  LEU*     3.8    25.7    -      -       +      +
    519A  LEU*     5.5     1.3    -      -       +      -
    524A  VAL*     4.7     1.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 482 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    408A  LEU*     4.8     4.2    -      -       -      +
    412A  LEU*     4.1    15.6    -      -       +      +
    418A  TYR*     3.8    19.0    +      -       +      -
    478A  SER*     2.9    28.1    +      -       -      +
    479A  MET*     3.1     4.6    +      -       -      +
    481A  ILE*     1.3    76.3    -      -       -      +
    483A  LEU*     1.3    64.3    +      -       -      +
    485A  ARG*     3.2     9.5    +      -       -      +
    486A  VAL*     3.2    24.9    +      -       -      +
    518A  PRO*     3.6    11.6    -      -       -      +
    519A  LEU*     2.8    56.0    +      -       -      +
    520A  LEU*     4.7     2.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 483 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    392A  LEU*     4.5     0.7    -      -       +      -
    417A  LEU*     4.0    20.0    -      -       +      -
    418A  TYR*     4.2    13.5    -      -       +      -
    421A  PHE*     3.8    34.9    -      -       +      -
    451A  ALA*     3.7    38.8    -      -       +      +
    454A  TYR*     4.5    11.2    -      -       +      -
    479A  MET*     3.0    39.6    +      -       +      +
    480A  GLY*     3.2    10.1    +      -       -      +
    482A  ASN*     1.3    74.5    -      -       -      +
    484A  PHE*     1.3    64.1    +      -       -      +
    486A  VAL*     3.1     6.9    +      -       -      +
    487A  LEU*     3.0    27.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 484 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    389A  VAL*     3.4    28.5    -      -       +      -
    390A  VAL*     4.2    10.1    -      -       +      -
    392A  LEU*     4.1    15.8    -      -       +      +
    393A  ALA*     3.8    32.1    -      -       +      +
    480A  GLY      3.0    13.1    +      -       -      +
    481A  ILE*     3.3    13.0    -      -       -      +
    483A  LEU*     1.3    73.2    -      -       -      +
    485A  ARG*     1.4    68.8    +      -       -      +
    487A  LEU*     3.2     2.6    +      -       -      +
    488A  MET*     2.9    53.9    +      -       +      +
    498A  LEU*     5.5     1.1    -      -       +      -
    502A  ALA*     3.7    25.6    -      -       +      -
    505A  PHE*     4.1    17.7    -      +       -      -
    506A  LEU*     4.2    10.8    -      -       +      -
    530A  LEU*     4.0    10.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 485 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418A  TYR*     4.4     3.8    +      -       -      -
    481A  ILE      3.0    12.9    +      -       -      +
    482A  ASN*     3.3    16.1    +      -       -      +
    484A  PHE*     1.4    79.1    -      -       -      +
    486A  VAL*     1.3    63.8    +      -       -      +
    488A  MET*     3.5     3.7    +      -       -      +
    489A  THR*     2.8    33.6    +      -       -      -
    506A  LEU*     4.1    21.1    -      -       +      -
    508A  THR*     4.9    10.6    +      -       +      +
    509A  GLU      5.0     4.8    +      -       -      -
    510A  LEU*     3.8    24.0    -      -       +      +
    511A  THR      5.3     2.0    +      -       -      +
    514A  GLY*     3.1    33.1    +      -       -      -
    515A  ILE*     4.2    11.2    -      -       -      +
    517A  GLN*     3.1    24.9    +      -       -      +
    518A  PRO*     4.1     2.8    -      -       -      +
    519A  LEU*     3.8    36.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 486 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418A  TYR*     3.4    33.9    -      -       +      +
    421A  PHE*     4.1    24.2    -      -       +      +
    422A  THR*     4.6     1.8    -      -       +      -
    482A  ASN      3.2    13.2    +      -       -      +
    483A  LEU*     3.1     8.8    +      -       -      +
    485A  ARG*     1.3    75.3    -      -       -      +
    487A  LEU*     1.3    64.2    +      -       -      +
    489A  THR*     3.0    13.7    +      -       -      -
    490A  TYR*     3.1    45.4    +      -       +      +
    515A  ILE*     4.1    23.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 487 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    389A  VAL*     4.8    15.5    -      -       +      -
    392A  LEU*     3.4    32.8    -      -       +      -
    421A  PHE*     4.1    11.4    -      -       +      -
    444A  ILE*     3.6    33.8    -      -       +      +
    447A  LEU*     3.8    23.6    -      -       +      -
    448A  ALA*     3.7    23.6    -      -       +      +
    483A  LEU      3.0    15.2    +      -       -      +
    484A  PHE*     3.2     4.5    +      -       -      +
    486A  VAL*     1.3    77.1    -      -       -      +
    488A  MET*     1.3    58.2    +      -       -      +
    490A  TYR*     3.2     9.6    +      -       +      +
    491A  LEU*     3.0    32.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 488 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    389A  VAL*     3.8    24.0    -      -       +      -
    484A  PHE*     2.9    50.3    +      -       +      +
    485A  ARG*     4.0     1.1    -      -       -      +
    487A  LEU*     1.3    72.9    -      -       -      +
    489A  THR*     1.3    60.9    +      -       -      +
    491A  LEU*     3.7    10.3    -      -       +      +
    492A  LYS*     3.0    28.6    +      -       -      +
    495A  LEU*     4.7     5.4    -      -       +      +
    498A  LEU*     3.6    37.5    -      -       +      +
    499A  THR*     3.6    31.8    +      -       -      +
    502A  ALA*     4.1     2.7    -      -       +      -
    510A  LEU*     3.7    20.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 489 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40A  MET*     3.8    12.8    -      -       +      +
    485A  ARG*     2.8    19.9    +      -       -      -
    486A  VAL      3.0    10.0    +      -       -      -
    488A  MET*     1.3    78.4    -      -       -      +
    490A  TYR*     1.3    65.6    +      -       +      +
    492A  LYS*     3.3    18.9    +      -       -      +
    493A  PRO*     3.9     2.3    -      -       -      +
    510A  LEU*     3.7    20.9    -      -       +      +
    511A  THR      3.4    26.0    +      -       -      +
    512A  TRP*     3.9    20.5    -      -       +      +
    515A  ILE*     3.6    21.2    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 490 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    421A  PHE      2.6    26.4    +      -       -      -
    422A  THR      3.8     0.2    +      -       -      -
    425A  ALA*     3.3    39.0    +      -       +      +
    428A  ILE*     3.6    28.0    -      -       +      -
    432A  TRP*     3.0    31.0    +      -       -      -
    444A  ILE*     3.7    20.4    -      -       +      -
    447A  LEU*     3.9    13.0    -      -       +      -
    486A  VAL*     3.1    31.4    +      -       +      +
    487A  LEU*     3.2     9.8    +      -       +      +
    489A  THR*     1.3    77.9    -      -       +      +
    491A  LEU*     1.3    61.4    +      -       -      +
    493A  PRO*     3.6     3.9    -      -       -      +
    512A  TRP*     3.7    26.7    -      +       -      -
    515A  ILE*     3.5    18.3    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 491 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    357A  TYR*     4.7    15.7    -      -       +      -
    389A  VAL*     3.8    38.4    -      -       +      -
    432A  TRP*     4.9     0.4    -      -       +      -
    441A  VAL*     5.1     4.3    -      -       +      -
    444A  ILE*     3.8    32.3    -      -       +      -
    445A  MET*     4.3     4.3    -      -       +      -
    487A  LEU      3.0    20.1    +      -       -      +
    488A  MET*     3.7     9.9    -      -       +      +
    489A  THR      3.2     0.4    -      -       -      -
    490A  TYR*     1.3    75.4    -      -       -      +
    492A  LYS*     1.3    64.0    +      -       -      +
    493A  PRO*     3.2     4.9    -      -       -      -
    494A  VAL*     2.9    29.9    +      -       +      +
    495A  LEU*     3.0    35.0    +      -       +      +
    499A  THR*     4.5     0.7    -      -       -      -
----------------------------------------------------------
 Back to top of page


A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il