Contacts of the helix formed by residues 269 - 294 (chain R) in PDB entry 6DDE


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 LYS 269 (chain R).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    268R  SER*     1.3    68.2    -      -       -      +
    270R  GLU*     1.3    53.4    +      -       -      +
    271R  LYS      3.3     0.7    -      -       -      -
    272R  ASP*     3.4    17.1    -      -       +      +
    273R  ARG*     2.6    32.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 270 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    315A  ASP*     3.4    40.7    -      -       -      +
    268R  SER      2.6     7.7    +      -       -      +
    269R  LYS*     1.3    74.0    -      -       -      +
    271R  LYS*     1.3    57.5    +      -       -      +
    273R  ARG*     3.2    15.4    +      -       +      +
    274R  ASN*     2.9    53.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 271 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    314A  LYS      3.3    21.2    +      -       -      -
    315A  ASP*     3.4    30.9    -      -       -      +
    317A  LYS      4.8     4.9    +      -       -      -
    318A  GLU*     5.5     5.3    -      -       -      +
    263R  ARG*     4.8     8.4    +      -       -      +
    264R  MET*     3.3    39.4    +      -       +      +
    265R  LEU*     3.3    19.0    -      -       +      +
    267R  GLY      3.5    11.7    -      -       -      +
    268R  SER*     2.7    34.6    +      -       -      +
    270R  GLU*     1.3    76.0    -      -       -      +
    272R  ASP*     1.3    57.8    +      -       -      +
    274R  ASN*     3.1    10.3    +      -       -      +
    275R  LEU      2.9    22.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 272 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    265R  LEU      3.9     6.1    -      -       -      -
    266R  SER      3.8    20.1    -      -       -      +
    267R  GLY*     3.7     5.4    +      -       -      +
    269R  LYS*     3.2    21.6    +      -       +      +
    271R  LYS*     1.3    77.3    -      -       -      +
    273R  ARG*     1.3    56.7    +      -       -      +
    275R  LEU*     3.4    14.6    +      -       -      +
    276R  ARG*     2.9    39.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 273 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    269R  LYS      2.6    17.8    +      -       -      +
    270R  GLU*     3.2    17.4    +      -       -      +
    272R  ASP*     1.3    71.5    -      -       -      +
    274R  ASN*     1.3    60.6    +      -       -      +
    276R  ARG*     3.3    15.6    +      -       +      +
    277R  ARG*     2.9    27.0    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 274 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    315A  ASP      5.4     1.2    +      -       -      -
    354A  PHE*     4.5    25.3    -      -       +      +
    265R  LEU*     3.8    14.0    -      -       +      +
    270R  GLU*     2.9    46.1    +      -       -      +
    271R  LYS*     3.1    14.8    +      -       -      +
    273R  ARG*     1.3    75.8    -      -       -      +
    275R  LEU*     1.3    60.0    +      -       -      +
    277R  ARG*     3.1    17.2    +      -       -      +
    278R  ILE*     3.0    32.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 275 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256R  ILE      5.7     0.2    -      -       -      +
    259R  LEU*     3.6    48.5    -      -       +      +
    260R  LYS*     4.4    20.0    -      -       +      +
    265R  LEU*     3.5    40.9    -      -       +      +
    266R  SER*     5.1     3.4    -      -       -      +
    271R  LYS      2.9     6.6    +      -       -      +
    272R  ASP*     3.6    17.0    -      -       -      +
    274R  ASN*     1.3    75.6    -      -       -      +
    276R  ARG*     1.3    57.6    +      -       -      +
    278R  ILE*     3.3     8.7    +      -       +      +
    279R  THR*     3.0    44.4    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 276 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272R  ASP*     2.9    27.8    +      -       -      +
    273R  ARG*     3.4    18.1    -      -       +      +
    274R  ASN      3.2     0.2    -      -       -      -
    275R  LEU*     1.3    75.7    -      -       -      +
    277R  ARG*     1.3    57.8    +      -       -      +
    279R  THR*     2.7    21.2    +      -       -      +
    280R  ARG*     2.8    51.4    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 277 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    352A  GLY      4.8     2.8    +      -       -      -
    353A  LEU*     3.4    24.7    +      -       -      +
    354A  PHE      4.7     3.8    +      -       -      -
    273R  ARG*     2.9    15.1    +      -       +      +
    274R  ASN*     3.1    19.9    +      -       -      +
    276R  ARG*     1.3    75.2    -      -       -      +
    278R  ILE*     1.3    60.9    +      -       -      +
    280R  ARG*     3.3     8.2    +      -       -      +
    281R  MET*     2.9    36.4    +      -       +      +
    339R  LEU*     3.9    30.5    +      -       -      +
    340R  ASP*     4.5    11.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 278 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    348A  LEU*     4.4    13.7    -      -       +      -
    353A  LEU*     4.2    31.9    -      -       +      +
    354A  PHE*     3.1    38.6    -      -       -      +
    255R  MET*     5.3     0.9    -      -       +      -
    256R  ILE*     6.1     1.8    -      -       +      -
    259R  LEU*     3.9    25.8    -      -       +      -
    265R  LEU*     4.8     6.7    -      -       +      -
    274R  ASN      3.0    17.8    +      -       -      +
    275R  LEU*     3.3    14.6    +      -       +      +
    277R  ARG*     1.3    78.7    -      -       +      +
    279R  THR*     1.3    57.7    -      -       +      +
    281R  MET*     3.3     6.4    +      -       -      +
    282R  VAL*     3.0    35.0    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 279 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256R  ILE*     3.9    33.4    -      -       +      -
    259R  LEU*     6.5     0.4    -      -       +      -
    260R  LYS*     4.9    10.5    -      -       +      +
    275R  LEU*     3.0    26.4    +      -       +      +
    276R  ARG*     2.7    27.5    +      -       -      +
    278R  ILE*     1.3    77.0    -      -       +      +
    280R  ARG*     1.3    63.0    +      -       -      +
    282R  VAL*     3.9     5.2    -      -       -      +
    283R  LEU*     2.9    42.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 280 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    276R  ARG*     2.8    59.4    +      -       +      +
    277R  ARG*     3.7     7.6    -      -       +      +
    278R  ILE      3.3     0.2    -      -       -      -
    279R  THR*     1.3    83.6    +      -       -      +
    281R  MET*     1.3    56.9    +      -       -      +
    283R  LEU*     3.4    29.9    -      -       -      +
    284R  VAL*     2.9    41.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 281 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    352A  GLY      5.3     1.3    -      -       -      +
    353A  LEU*     3.7    28.3    -      -       +      -
    165R  ARG*     4.6     8.7    -      -       -      +
    277R  ARG*     2.9    27.5    +      -       +      +
    278R  ILE*     3.3     6.0    +      -       -      +
    280R  ARG*     1.3    76.0    -      -       -      +
    282R  VAL*     1.3    59.1    +      -       +      +
    284R  VAL*     3.4     6.5    +      -       -      +
    285R  VAL*     3.0    31.2    +      -       +      +
    335R  LEU*     4.1    21.7    -      -       +      +
    336R  TYR*     4.3    19.1    -      -       +      -
    339R  LEU*     3.4    37.0    -      -       +      +
    340R  ASP*     3.7    13.7    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 282 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    353A  LEU*     5.1     9.0    -      -       +      -
    165R  ARG*     5.3     4.0    -      -       -      +
    252R  TYR*     3.7    37.5    -      -       +      -
    255R  MET*     3.8    24.5    -      -       +      -
    256R  ILE*     3.7    23.6    -      -       +      -
    278R  ILE*     3.0    23.5    +      -       +      +
    279R  THR      3.9     3.4    -      -       -      +
    281R  MET*     1.3    77.5    -      -       +      +
    283R  LEU*     1.3    62.7    +      -       +      +
    285R  VAL*     3.2    10.1    -      -       +      +
    286R  VAL*     3.0    25.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 283 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256R  ILE*     5.0    14.1    -      -       +      -
    279R  THR*     2.9    23.9    +      -       -      +
    280R  ARG*     3.4    33.0    -      -       -      +
    282R  VAL*     1.3    76.3    -      -       +      +
    284R  VAL*     1.3    59.1    +      -       +      +
    286R  VAL*     4.1     5.9    -      -       +      +
    287R  ALA*     2.9    32.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 284 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    280R  ARG*     2.9    28.0    +      -       +      +
    281R  MET*     3.9     4.7    -      -       -      +
    282R  VAL      3.3     0.2    -      -       -      -
    283R  LEU*     1.3    77.5    -      -       +      +
    285R  VAL*     1.3    57.8    +      -       -      +
    287R  ALA*     3.8     4.9    -      -       -      +
    288R  VAL*     2.8    32.0    +      -       +      +
    335R  LEU*     3.8    29.4    -      -       +      -
    339R  LEU*     6.1     0.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 285 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158R  LEU*     5.5     2.7    -      -       +      -
    165R  ARG*     5.1     4.7    -      -       -      +
    248R  ILE*     5.6     1.7    -      -       +      +
    252R  TYR*     4.3    19.7    -      -       +      -
    281R  MET*     3.0    19.5    +      -       +      +
    282R  VAL*     3.2    20.6    -      -       -      +
    284R  VAL*     1.3    76.5    -      -       -      +
    286R  VAL*     1.3    62.4    +      -       +      +
    288R  VAL*     3.3     3.8    -      -       +      +
    289R  PHE*     3.0    24.5    +      -       +      +
    332R  ASN*     4.8     4.7    -      -       -      +
    335R  LEU*     3.7    19.7    -      -       +      -
    336R  TYR*     3.3    40.4    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 286 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    245R  VAL*     6.2     1.1    -      -       +      -
    248R  ILE*     4.0    23.8    -      -       +      +
    249R  THR*     4.8    19.7    -      -       -      +
    252R  TYR*     3.8    27.4    -      -       +      -
    282R  VAL*     3.0    20.8    +      -       +      +
    283R  LEU*     4.1     7.2    -      -       +      +
    285R  VAL*     1.3    77.1    -      -       +      +
    287R  ALA*     1.3    58.3    +      -       -      +
    289R  PHE*     3.3     6.4    +      -       -      +
    290R  ILE*     3.0    46.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 287 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    283R  LEU      2.9    20.9    +      -       -      +
    284R  VAL*     3.9     5.2    -      -       -      +
    286R  VAL*     1.3    78.5    -      -       -      +
    288R  VAL*     1.3    56.6    +      -       -      +
    290R  ILE*     3.4     7.3    +      -       -      +
    291R  VAL*     2.8    32.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 288 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    284R  VAL*     2.8    24.1    +      -       +      +
    285R  VAL*     3.3    15.9    -      -       +      +
    287R  ALA*     1.3    74.0    -      -       -      +
    289R  PHE*     1.3    63.9    +      -       -      +
    291R  VAL*     4.4     5.6    -      -       +      +
    292R  CYS*     2.9    37.9    +      -       +      +
    327R  THR      6.0     0.7    -      -       -      +
    328R  ASN*     5.0    11.4    -      -       -      +
    331R  LEU*     5.1    23.1    -      -       +      +
    332R  ASN*     6.4     1.3    -      -       -      -
    335R  LEU*     3.8    16.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 289 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155R  ILE*     5.0     4.3    -      -       +      -
    158R  LEU*     3.6    26.5    -      -       +      -
    240R  ALA      5.1     1.1    -      -       -      -
    241R  PHE*     4.8     6.5    -      +       -      -
    244R  PRO*     4.2    21.3    -      -       +      -
    245R  VAL*     3.6    38.6    -      -       +      -
    248R  ILE*     4.1    20.9    -      -       +      -
    285R  VAL*     3.0    19.7    +      -       +      +
    286R  VAL*     3.5     7.4    -      -       -      +
    288R  VAL*     1.3    79.0    -      -       +      +
    290R  ILE*     1.3    64.2    +      -       +      +
    292R  CYS*     3.9     0.7    -      -       -      +
    293R  TRP*     3.0    59.4    +      +       -      +
    328R  ASN*     3.3    23.6    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 290 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    241R  PHE*     5.0     9.9    -      -       +      -
    245R  VAL*     4.5    28.5    -      -       +      -
    249R  THR*     6.2     0.9    -      -       -      -
    286R  VAL*     3.0    35.1    +      -       +      +
    287R  ALA*     3.9     6.5    -      -       -      +
    289R  PHE*     1.3    77.7    -      -       +      +
    291R  VAL*     1.3    59.1    +      -       -      +
    294R  THR*     3.0    44.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 291 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    287R  ALA      2.8    20.3    +      -       -      +
    288R  VAL*     4.2     6.3    -      -       +      +
    290R  ILE*     1.3    77.9    -      -       -      +
    292R  CYS*     1.3    61.3    +      -       -      +
    294R  THR*     5.2     1.6    -      -       -      -
    295R  PRO*     4.0    12.6    -      -       -      +
    324R  LEU*     4.0     7.3    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with CYS 292 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288R  VAL*     2.9    23.6    +      -       +      +
    289R  PHE      4.0     1.1    -      -       -      +
    291R  VAL*     1.3    79.1    -      -       -      +
    293R  TRP*     1.3    63.9    +      -       -      +
    295R  PRO*     3.7     1.4    -      -       -      +
    296R  ILE*     4.6     0.7    -      -       -      +
    324R  LEU*     2.9    47.5    -      -       -      +
    325R  GLY*     3.8     1.0    -      -       -      -
    327R  THR*     4.8     2.9    -      -       -      -
    328R  ASN*     3.7    31.2    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TRP 293 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114R  ASP*     5.9     0.2    -      -       -      -
    151R  MET*     4.6    17.5    -      -       +      +
    154R  SER*     4.2    19.7    -      -       -      -
    155R  ILE*     3.5    36.3    -      -       +      -
    158R  LEU*     5.1     0.7    -      -       +      -
    240R  ALA      5.2     2.7    -      -       -      -
    241R  PHE*     3.2    18.0    -      +       +      -
    289R  PHE*     3.0    35.3    +      +       +      +
    292R  CYS*     1.3    75.7    -      -       +      +
    294R  THR*     1.3    63.0    +      -       -      +
    295R  PRO*     4.0     0.2    -      -       -      -
    296R  ILE*     3.6    14.9    -      -       +      +
    297R  HIS*     3.1    34.3    -      +       +      -
    325R  GLY*     2.6    44.1    +      -       -      -
    326R  TYR*     5.7     3.6    -      +       -      -
    328R  ASN*     3.3    32.5    -      -       +      -
    329R  SER*     5.1     7.9    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 294 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    241R  PHE*     3.9    16.8    -      -       -      -
    290R  ILE*     3.0    25.8    +      -       -      -
    291R  VAL*     5.1     1.1    -      -       -      -
    293R  TRP*     1.3    77.3    -      -       -      +
    295R  PRO*     1.4    68.2    -      -       -      +
    297R  HIS*     3.1     6.1    +      -       -      +
    298R  ILE*     2.9    35.3    +      -       -      +
----------------------------------------------------------
 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