Contacts of the helix formed by residues 269 - 297 (chain C) in PDB entry 4Z9G


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 269 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    246C  TRP*     3.6    13.1    +      -       -      +
    250C  LYS*     3.5    25.5    +      -       -      -
    254C  ASP*     5.2     0.7    -      -       -      +
    259C  TRP      4.7     3.3    -      -       -      +
    260C  ALA      5.0     7.7    -      -       -      +
    267C  TYR*     3.6     1.2    -      -       -      +
    268C  THR*     1.3    77.4    +      -       -      +
    270C  TYR*     1.3    65.4    +      -       +      +
    271C  ILE      3.2     0.4    +      -       -      -
    272C  TYR*     3.7    15.3    +      -       -      -
    273C  GLN*     3.2    48.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 270 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    267C  TYR*     4.0    53.8    -      +       +      +
    268C  THR      3.0     0.2    -      -       -      -
    269C  ASP*     1.3    82.3    -      -       +      +
    271C  ILE*     1.3    58.2    +      -       +      +
    272C  TYR      3.3     0.2    -      -       -      -
    273C  GLN*     4.4     6.5    -      -       +      -
    274C  GLY*     2.7    37.7    +      -       -      +
    275C  PRO*     3.9     0.7    -      -       -      +
    331C  PHE*     5.6    17.1    -      +       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 271 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242C  ILE*     4.0    10.7    -      -       +      +
    245C  ALA*     4.0    25.8    -      -       +      +
    246C  TRP*     3.9    26.2    -      -       +      +
    249C  GLY*     4.2     9.4    -      -       -      -
    267C  TYR      5.1     2.2    -      -       -      +
    268C  THR*     3.1    35.8    +      -       +      +
    270C  TYR*     1.3    77.7    -      -       +      +
    272C  TYR*     1.3    58.0    +      -       -      +
    275C  PRO*     3.1    21.4    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 272 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    196C  ASN*     2.6    38.3    +      -       +      -
    199C  HIS*     4.9     8.7    +      -       -      -
    200C  VAL*     3.9    15.0    -      -       +      +
    242C  ILE*     3.6    22.9    -      -       +      +
    243C  ILE*     4.5     7.2    -      -       +      -
    246C  TRP*     3.6    44.2    -      +       +      -
    269C  ASP*     3.8    21.0    +      -       -      -
    271C  ILE*     1.3    77.0    -      -       -      +
    273C  GLN*     1.3    95.5    +      -       +      +
    274C  GLY      3.1     2.4    +      -       -      -
    275C  PRO*     3.5     4.2    -      -       -      +
    276C  MET*     3.2    42.6    +      -       -      +
   1203C  OLA      4.8     4.8    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 273 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    269C  ASP*     3.2    37.3    +      -       -      +
    270C  TYR*     4.4     6.2    +      -       +      +
    272C  TYR*     1.3   104.6    +      -       +      +
    274C  GLY*     1.3    60.7    +      -       -      +
    276C  MET*     3.5     3.7    -      -       -      +
    277C  ALA*     3.2    18.0    +      -       -      +
    331C  PHE*     3.4    25.2    -      -       +      -
   1203C  OLA      3.3    62.0    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 274 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    270C  TYR*     2.7    26.6    +      -       -      +
    273C  GLN*     1.3    72.6    -      -       -      +
    275C  PRO*     1.3    62.5    -      -       -      +
    277C  ALA*     2.9    12.4    +      -       -      +
    278C  LEU*     2.9    24.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PRO 275 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    204C  PHE*     4.8     5.6    -      -       +      -
    242C  ILE*     3.7    31.2    -      -       +      -
    270C  TYR      3.9     0.4    -      -       -      +
    271C  ILE      3.1    27.8    -      -       -      +
    272C  TYR      3.5     5.8    -      -       -      +
    274C  GLY*     1.3    83.6    -      -       -      +
    276C  MET*     1.3    56.6    +      -       -      +
    278C  LEU*     3.3    18.1    -      -       +      +
    279C  VAL*     2.7    40.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 276 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199C  HIS*     3.5    29.8    -      -       +      +
    200C  VAL*     4.1    26.7    -      -       +      -
    203C  PHE*     3.2    57.9    -      -       +      -
    204C  PHE*     4.9     2.0    -      -       -      -
    272C  TYR*     3.2    41.5    +      -       -      +
    273C  GLN*     3.5    13.0    -      -       -      +
    274C  GLY      3.2     0.2    -      -       -      -
    275C  PRO*     1.3    76.3    -      -       -      +
    277C  ALA*     1.3    58.1    +      -       -      +
    279C  VAL*     3.7     4.4    +      -       -      +
    280C  LEU*     3.0    21.3    +      -       -      +
   1203C  OLA      3.8    15.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 277 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    273C  GLN      3.2     9.0    +      -       -      +
    274C  GLY*     2.9    11.2    +      -       -      +
    276C  MET*     1.3    77.4    -      -       -      +
    278C  LEU*     1.3    59.2    +      -       -      +
    280C  LEU*     3.2    10.6    +      -       +      +
    281C  LEU*     2.8    29.9    +      -       -      +
   1203C  OLA      4.0    22.8    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 278 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    274C  GLY      2.9     8.0    +      -       -      +
    275C  PRO*     3.1    23.1    +      -       +      +
    277C  ALA*     1.3    75.4    -      -       -      +
    279C  VAL*     1.3    65.6    +      -       +      +
    281C  LEU*     3.1    24.8    +      -       +      +
    282C  ILE*     3.1    37.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 279 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    203C  PHE*     3.8    17.3    -      -       +      +
    204C  PHE*     3.5    32.5    -      -       +      -
    207C  PHE*     3.4    43.9    -      -       +      -
    275C  PRO*     2.7    22.0    +      -       +      +
    276C  MET      3.7     5.6    -      -       -      +
    278C  LEU*     1.3    77.0    -      -       +      +
    280C  LEU*     1.3    64.4    +      -       -      +
    282C  ILE*     3.3    13.2    +      -       +      +
    283C  ASN*     3.2    19.9    +      -       -      +
   1205C  1Q5      4.2     5.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 280 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    203C  PHE*     4.3     9.6    -      -       +      -
    276C  MET      3.0    16.7    +      -       -      +
    277C  ALA*     3.3     9.6    -      -       +      +
    279C  VAL*     1.3    75.3    -      -       -      +
    281C  LEU*     1.3    61.7    +      -       -      +
    283C  ASN*     3.3     4.7    +      -       -      +
    284C  PHE*     3.2    39.2    +      -       +      -
    320C  LEU*     5.1     1.6    -      -       +      -
   1203C  OLA      3.5    52.0    -      -       +      -
   1205C  1Q5      3.9    48.2    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 281 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    277C  ALA      2.8    13.4    +      -       -      +
    278C  LEU*     3.1    18.8    +      -       +      +
    280C  LEU*     1.3    76.3    -      -       -      +
    282C  ILE*     1.3    61.6    +      -       +      +
    284C  PHE*     2.9    32.6    +      -       +      +
    285C  ILE*     3.0    28.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 282 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207C  PHE*     4.1    16.2    -      -       +      -
    278C  LEU*     3.1    38.6    +      -       +      +
    279C  VAL*     3.3    11.0    +      -       +      +
    281C  LEU*     1.3    77.8    -      -       +      +
    283C  ASN*     1.3    57.5    +      -       -      +
    285C  ILE*     3.2    18.5    +      -       +      +
    286C  PHE*     2.9    53.7    +      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 283 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    206C  MET      3.2    10.9    +      -       -      -
    207C  PHE*     4.1     8.0    -      -       -      +
    210C  GLY*     3.3    22.7    -      -       -      -
    279C  VAL      3.2     8.2    +      -       -      +
    280C  LEU      3.4    10.1    -      -       -      +
    282C  ILE*     1.3    80.9    -      -       -      +
    284C  PHE*     1.3    51.3    +      -       -      +
    286C  PHE*     3.3    15.7    -      -       -      +
    287C  LEU*     2.7    33.8    +      -       -      +
   1205C  1Q5      2.9    72.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 284 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    280C  LEU*     3.2    41.1    +      -       +      -
    281C  LEU*     2.9    22.5    +      -       +      +
    283C  ASN*     1.3    73.0    -      -       -      +
    285C  ILE*     1.3    63.1    +      -       +      +
    287C  LEU*     3.7    14.5    -      -       +      +
    288C  PHE*     3.1    24.4    +      -       -      +
    320C  LEU*     3.5    39.9    -      -       +      -
   1203C  OLA      4.3    20.0    -      -       +      -
   1205C  1Q5      4.6     2.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 285 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    281C  LEU*     3.0    34.1    +      -       +      +
    282C  ILE*     3.3    20.2    -      -       +      +
    284C  PHE*     1.3    75.2    -      -       +      +
    286C  PHE*     1.3    69.7    +      -       +      +
    288C  PHE*     3.5     9.4    +      -       +      +
    289C  ASN*     3.2    23.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 286 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207C  PHE*     3.5    28.3    -      +       -      -
    210C  GLY      4.2     7.9    -      -       -      -
    211C  CYS*     3.8    20.0    -      -       +      -
    214C  HIS*     3.7    39.8    -      +       +      -
    282C  ILE*     2.9    32.8    +      -       +      -
    283C  ASN*     3.3    25.1    -      -       -      +
    285C  ILE*     1.3    79.9    -      -       +      +
    287C  LEU*     1.3    63.9    +      -       -      +
    289C  ASN*     3.2     6.3    +      -       -      +
    290C  ILE*     3.0    27.5    +      -       -      +
   1205C  1Q5      4.1     9.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 287 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    213C  LEU*     5.6     1.3    -      -       +      -
    283C  ASN      2.7    20.0    +      -       -      +
    284C  PHE*     3.7    13.9    -      -       +      +
    285C  ILE      3.3     0.2    -      -       -      -
    286C  PHE*     1.3    74.1    -      -       -      +
    288C  PHE*     1.3    62.1    +      -       -      +
    290C  ILE*     3.3    18.6    +      -       +      +
    291C  VAL*     3.1    28.3    +      -       +      +
    313C  VAL*     4.2    25.6    -      -       +      -
    316C  THR*     4.5    10.3    -      -       +      -
    317C  LEU*     4.0    24.2    -      -       +      -
    320C  LEU*     4.1    10.1    -      -       +      -
   1205C  1Q5      3.9    35.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 288 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    284C  PHE      3.1    17.3    +      -       -      +
    285C  ILE*     4.0     7.9    -      -       +      +
    286C  PHE      3.4     0.2    -      -       -      -
    287C  LEU*     1.3    71.7    -      -       -      +
    289C  ASN*     1.3    70.2    +      -       -      +
    291C  VAL*     3.0    14.4    +      -       +      +
    292C  ARG*     3.0    31.4    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 289 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    214C  HIS*     3.8    24.7    +      -       +      +
    218C  VAL*     3.9     5.7    -      -       -      +
    285C  ILE*     3.2    13.2    +      -       +      +
    286C  PHE*     3.2     8.9    +      -       -      +
    288C  PHE*     1.3    81.0    -      -       +      +
    290C  ILE*     1.3    57.6    +      -       -      +
    292C  ARG*     2.9    31.7    +      -       -      +
    293C  ILE*     2.9    40.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 290 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    213C  LEU*     4.1    25.8    -      -       +      -
    214C  HIS*     4.1    26.5    -      -       +      -
    217C  ILE*     3.6    22.0    -      -       +      -
    218C  VAL*     4.7     4.7    -      -       +      -
    286C  PHE      3.0    27.1    +      -       -      +
    287C  LEU*     3.4    15.3    -      -       +      +
    289C  ASN*     1.3    77.4    -      -       -      +
    291C  VAL*     1.3    57.2    +      -       -      +
    293C  ILE*     3.3     7.1    +      -       -      +
    294C  LEU*     2.8    33.0    +      -       +      +
    313C  VAL*     3.5    30.1    -      -       +      -
   1205C  1Q5      4.2     9.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 291 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    287C  LEU*     3.1    26.7    -      -       +      +
    288C  PHE*     3.0    15.0    +      -       +      +
    290C  ILE*     1.3    73.6    -      -       +      +
    292C  ARG*     1.3    65.1    +      -       -      +
    294C  LEU*     4.5     6.7    -      -       +      -
    295C  MET*     3.1    46.4    +      -       +      +
    313C  VAL*     5.1     9.4    -      -       +      -
    317C  LEU*     6.5     0.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 292 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    218C  VAL*     5.2     2.6    -      -       -      +
    288C  PHE*     3.0    26.5    +      -       +      +
    289C  ASN*     2.9    36.7    +      -       -      +
    291C  VAL*     1.3    77.3    -      -       -      +
    293C  ILE*     1.3    73.8    +      -       -      +
    295C  MET*     5.1     0.7    -      -       -      -
    296C  THR*     2.2    55.2    +      -       +      +
    297C  LYS*     4.1    22.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 293 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    217C  ILE*     3.9    13.7    -      -       +      +
    218C  VAL*     3.7    32.3    -      -       +      +
    289C  ASN*     2.9    22.1    +      -       -      +
    290C  ILE      3.3     5.6    +      -       -      +
    292C  ARG*     1.3   105.4    -      -       -      +
    294C  LEU*     1.3    66.2    +      -       -      +
    296C  THR*     3.9     2.7    -      -       -      -
    297C  LYS*     3.1    25.5    +      -       +      +
    298C  LEU*     3.1    45.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 294 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    217C  ILE*     4.3    23.8    -      -       +      -
    290C  ILE*     2.8    30.9    +      -       +      +
    291C  VAL*     4.2     6.7    -      -       +      +
    293C  ILE*     1.3    73.5    -      -       -      +
    295C  MET*     1.3    64.7    +      -       +      +
    298C  LEU*     3.2    34.0    -      -       +      +
    299C  ARG*     3.3     4.3    +      -       -      -
    306C  THR*     4.4    10.3    -      -       -      +
    309C  ALA*     4.5     1.6    -      -       +      -
    310C  ARG*     4.0    40.5    +      -       +      +
    313C  VAL*     3.6    36.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 295 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291C  VAL*     3.1    36.2    +      -       +      +
    292C  ARG*     4.3     1.1    -      -       -      +
    294C  LEU*     1.3    82.6    -      -       +      +
    296C  THR*     1.3    66.3    +      -       +      +
    299C  ARG*     3.0    45.3    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 296 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292C  ARG*     2.2    48.5    +      -       +      +
    293C  ILE*     3.9     0.2    -      -       -      -
    295C  MET*     1.3    84.4    -      -       +      +
    297C  LYS*     1.3    77.3    +      -       -      +
    299C  ARG*     4.5     2.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 297 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292C  ARG*     4.1    22.8    -      -       -      +
    293C  ILE*     3.1    26.3    +      -       +      +
    296C  THR*     1.3    91.7    +      -       -      +
    298C  LEU*     1.3    75.6    +      -       +      +
    299C  ARG      3.7     0.7    -      -       -      -
    300C  ALA*     5.4     1.2    +      -       -      +
    301C  SER*     5.3     1.0    -      -       -      -
----------------------------------------------------------
 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