Contacts of the helix formed by residues 286 - 311 (chain B) in PDB entry 6D6U


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 MET 286 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146B  PHE*     4.0    31.5    +      -       +      -
    147B  PRO*     5.8     0.2    -      -       -      -
    226B  PHE*     6.0     5.4    -      -       -      -
    230B  THR*     4.8     9.4    -      -       +      -
    231B  TYR*     3.4    37.2    -      -       +      +
    273B  ALA*     3.3    45.1    -      -       +      +
    274B  ARG*     4.5     4.5    -      -       +      +
    276B  SER*     5.0     1.8    -      -       -      +
    277B  LEU*     5.0     4.3    -      -       +      -
    284B  THR*     3.1     9.4    +      -       -      +
    285B  ALA*     1.3    78.6    -      -       -      +
    287B  ASP*     1.3    66.3    +      -       -      +
    288B  TRP      3.2     2.2    -      -       -      -
    289B  PHE*     3.2     4.1    +      -       -      +
    290B  ILE*     2.9    33.7    +      -       +      +
    340B  TYR*     4.6     0.2    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 287 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    274B  ARG*     3.7    30.6    -      -       -      +
    282B  TYR      4.8     1.2    -      -       -      +
    283B  ALA*     3.6    17.1    -      -       +      +
    284B  THR*     3.2    39.1    +      -       -      +
    286B  MET*     1.3    79.4    -      -       -      +
    288B  TRP*     1.3    58.3    +      -       +      +
    290B  ILE*     3.4     7.1    +      -       -      +
    291B  ALA*     2.8    31.5    +      -       -      +
    220C  TYR*     5.5     6.6    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TRP 288 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    283B  ALA*     4.2    24.2    +      -       +      +
    284B  THR      3.2    27.0    +      -       -      -
    285B  ALA*     4.4     9.6    -      -       -      +
    286B  MET      3.2     0.6    -      -       -      -
    287B  ASP*     1.3    78.5    -      -       +      +
    289B  PHE*     1.3    56.5    +      -       -      +
    291B  ALA*     3.3     8.6    +      -       +      +
    292B  VAL*     2.9    37.9    +      -       +      +
    336B  PHE*     5.0     6.1    -      -       +      -
    340B  TYR*     5.1     7.6    -      -       +      -
    344B  TYR*     5.3     4.3    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 289 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    230B  THR*     6.2     0.4    -      -       +      -
    231B  TYR*     3.7    44.9    -      +       +      -
    234B  CYS*     3.9    16.8    -      -       +      -
    235B  ILE*     3.5    29.8    -      -       +      -
    285B  ALA      4.5     1.0    +      -       -      -
    286B  MET*     3.2    10.5    +      -       -      +
    288B  TRP*     1.3    79.6    -      -       -      +
    290B  ILE*     1.3    67.0    +      -       +      +
    292B  VAL*     3.2     6.0    +      -       +      +
    293B  CYS*     3.0    30.1    +      -       -      -
    333B  PHE*     4.8     6.3    -      +       -      -
    336B  PHE*     4.3    18.6    -      +       -      -
    337B  ASN*     3.9    21.8    -      -       -      -
    340B  TYR*     4.4    30.1    -      +       +      +
    341B  TRP*     4.7     7.6    -      +       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 290 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    230B  THR*     5.2     8.1    -      -       +      -
    234B  CYS*     5.1     5.2    -      -       +      -
    269B  LEU*     6.2     2.2    -      -       +      -
    270B  SER*     3.9    30.7    -      -       -      +
    273B  ALA*     3.8    29.2    -      -       +      -
    274B  ARG*     4.7    11.9    -      -       +      +
    286B  MET*     2.9    39.8    +      -       +      +
    287B  ASP*     3.8     7.0    -      -       -      +
    289B  PHE*     1.3    80.7    -      -       +      +
    291B  ALA*     1.3    59.7    +      -       -      +
    293B  CYS*     3.4     9.5    +      -       +      +
    294B  TYR*     2.9    31.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 291 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    287B  ASP      2.8    19.4    +      -       -      +
    288B  TRP*     3.7    12.3    -      -       +      +
    290B  ILE*     1.3    76.3    -      -       -      +
    292B  VAL*     1.3    59.6    +      -       +      +
    294B  TYR*     3.5    10.1    -      -       +      +
    295B  ALA*     2.8    30.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 292 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288B  TRP*     2.9    25.5    +      -       +      +
    289B  PHE*     3.2     2.9    +      -       +      +
    291B  ALA*     1.3    75.9    -      -       +      +
    293B  CYS*     1.3    67.9    +      -       -      +
    295B  ALA*     3.9     4.7    -      -       -      +
    296B  PHE*     3.0    49.1    +      -       +      +
    333B  PHE*     4.8     4.5    -      -       +      -
    336B  PHE*     3.3    53.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with CYS 293 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    234B  CYS*     2.0    51.8    -      -       -      -
    238B  VAL*     3.8    22.9    -      -       +      -
    266B  MET*     4.1     6.5    -      -       -      -
    289B  PHE*     3.0    29.8    +      -       -      -
    290B  ILE*     3.4     8.7    -      -       +      +
    292B  VAL*     1.3    76.7    -      -       -      +
    294B  TYR*     1.3    57.1    +      -       -      +
    296B  PHE*     3.3     2.6    +      -       -      +
    297B  VAL*     3.0    35.8    +      -       -      +
    333B  PHE*     5.1     5.1    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 294 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    263B  VAL*     6.2     0.2    -      -       +      -
    266B  MET*     5.1    13.7    -      -       +      -
    267B  THR*     5.2     9.6    -      -       -      -
    290B  ILE*     2.9    22.5    +      -       +      +
    291B  ALA*     3.5    11.4    -      -       +      +
    292B  VAL      3.1     0.2    -      -       -      -
    293B  CYS*     1.3    75.3    -      -       -      +
    295B  ALA*     1.3    59.3    +      -       -      +
    297B  VAL*     3.0    12.7    -      -       +      +
    298B  PHE*     3.0    62.3    +      +       -      +
    410B  Y01      2.3    83.9    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 295 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291B  ALA      2.8    21.2    +      -       -      +
    292B  VAL*     3.3     6.5    +      -       -      +
    294B  TYR*     1.3    74.9    -      -       -      +
    296B  PHE*     1.3    64.4    +      -       +      +
    298B  PHE*     3.8     2.5    -      -       -      +
    299B  SER*     2.9    31.0    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 296 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    238B  VAL*     4.5    14.1    -      -       +      -
    292B  VAL*     3.0    33.7    +      -       +      +
    293B  CYS      3.8     2.9    -      -       -      +
    295B  ALA*     1.3    82.3    -      -       +      +
    297B  VAL*     1.3    57.6    +      -       -      +
    299B  SER*     2.5    23.7    +      -       -      -
    300B  ALA*     2.9    16.3    +      -       -      +
    329B  PHE*     4.9    16.8    -      +       +      -
    332B  LEU*     4.3    21.1    -      -       +      -
    333B  PHE*     3.5    58.6    -      +       +      -
    336B  PHE*     5.0     3.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 297 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    238B  VAL*     4.3     9.4    -      -       +      -
    241B  SER*     4.6    18.4    -      -       -      +
    262B  THR*     5.1    12.9    +      -       -      +
    263B  VAL*     5.6     3.5    -      -       +      +
    266B  MET*     3.7    39.9    -      -       +      -
    293B  CYS      3.0    19.6    +      -       -      +
    294B  TYR*     3.0    26.9    -      -       +      +
    296B  PHE*     1.3    76.0    -      -       +      +
    298B  PHE*     1.3    72.3    +      -       +      +
    300B  ALA*     3.3     8.2    +      -       -      +
    301B  LEU*     3.0    25.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 298 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    263B  VAL*     3.4    42.8    -      -       +      -
    267B  THR*     5.9     0.2    -      -       -      -
    294B  TYR*     3.0    62.7    +      +       -      +
    295B  ALA*     4.3     2.9    -      -       -      +
    297B  VAL*     1.3    86.1    -      -       +      +
    299B  SER*     1.3    61.5    +      -       -      +
    301B  LEU*     3.5    19.7    -      -       +      +
    302B  ILE*     2.9    40.0    +      -       +      +
    410B  Y01      3.9    16.4    -      -       +      -
    407C  Y01      4.5    17.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 299 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295B  ALA      2.9    16.9    +      -       -      -
    296B  PHE*     2.5    30.7    +      -       -      -
    298B  PHE*     1.3    73.1    -      -       -      +
    300B  ALA*     1.3    57.7    +      -       -      +
    302B  ILE*     3.3     8.6    +      -       -      +
    303B  GLU*     2.9    29.9    +      -       -      +
    329B  PHE*     4.0    22.2    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 300 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    241B  SER*     5.2    10.5    -      -       -      +
    244B  SER*     6.3     1.6    -      -       -      -
    245B  PHE*     3.6    34.2    -      -       +      -
    296B  PHE      2.9     7.5    +      -       -      +
    297B  VAL*     3.3    11.4    +      -       -      +
    299B  SER*     1.3    83.3    +      -       -      +
    301B  LEU*     1.3    58.6    +      -       -      +
    303B  GLU*     3.4     5.0    +      -       -      +
    304B  PHE*     2.9    28.9    +      -       -      +
    329B  PHE*     4.2     5.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 301 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    255B  ARG      6.1     0.2    -      -       -      +
    256B  THR*     6.4     1.1    -      -       -      -
    259B  GLY*     4.9    17.5    -      -       -      -
    263B  VAL*     4.5     9.9    -      -       +      -
    297B  VAL      3.0    14.0    +      -       -      +
    298B  PHE*     3.5    34.1    -      -       +      +
    299B  SER      3.2     0.2    -      -       -      -
    300B  ALA*     1.3    77.4    -      -       -      +
    302B  ILE*     1.3    60.3    +      -       +      +
    304B  PHE*     3.3    14.0    +      -       +      +
    305B  ALA*     2.9    27.9    +      -       +      +
    409B  Y01      3.5    43.1    -      -       +      -
    407C  Y01      5.6     8.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 302 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298B  PHE*     2.9    28.1    +      -       +      +
    299B  SER*     3.8     7.4    -      -       -      +
    301B  LEU*     1.3    73.8    -      -       +      +
    303B  GLU*     1.3    61.4    +      -       -      +
    305B  ALA*     3.2     7.9    +      -       +      +
    306B  THR*     2.9    32.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 303 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    245B  PHE*     3.0    26.8    -      -       +      -
    299B  SER      2.9    16.8    +      -       -      +
    300B  ALA*     3.5     7.9    -      -       -      +
    302B  ILE*     1.3    76.9    -      -       -      +
    304B  PHE*     1.3    75.0    +      -       -      +
    306B  THR*     3.1    12.3    -      -       +      +
    307B  VAL*     2.9    36.3    +      -       -      +
    321B  ILE*     3.1    28.3    -      -       +      +
    322B  ASP*     3.4    13.2    -      -       -      +
    325B  SER*     3.9    16.9    +      -       -      +
    329B  PHE*     4.8     7.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 304 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    244B  SER*     4.6     9.2    -      -       -      +
    251B  SER      4.4     0.2    -      -       -      -
    252B  VAL*     3.8    22.9    -      -       -      -
    255B  ARG*     3.2    62.1    -      -       +      -
    256B  THR*     3.6    23.6    -      -       +      -
    300B  ALA      2.9    14.4    +      -       -      +
    301B  LEU*     3.3    18.1    +      -       +      +
    303B  GLU*     1.3    83.9    +      -       -      +
    305B  ALA*     1.3    60.9    +      -       -      +
    307B  VAL*     3.3     4.7    +      -       +      +
    308B  ASN*     2.9    49.1    +      -       +      +
    409B  Y01      4.6    15.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 305 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    301B  LEU*     2.9    17.4    +      -       +      +
    302B  ILE*     3.2    10.7    +      -       +      +
    304B  PHE*     1.3    81.7    -      -       -      +
    306B  THR*     1.3    61.7    +      -       -      +
    308B  ASN*     3.5    11.9    +      -       -      +
    309B  TYR*     3.6    11.1    +      -       -      +
    409B  Y01      4.6    33.6    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 306 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    302B  ILE*     2.9    20.7    +      -       +      +
    303B  GLU*     3.1    21.5    -      -       +      +
    305B  ALA*     1.3    73.8    -      -       -      +
    307B  VAL*     1.3    66.0    +      -       +      +
    309B  TYR*     3.2     6.5    +      -       -      +
    310B  PHE*     2.9    56.1    +      -       +      -
    321B  ILE*     5.3     5.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 307 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    249B  ARG*     5.0     8.5    -      -       +      +
    255B  ARG*     5.1    11.2    -      -       -      +
    303B  GLU*     2.9    43.9    +      -       -      +
    304B  PHE*     3.8     7.0    -      -       +      +
    306B  THR*     1.3    75.0    -      -       +      +
    308B  ASN*     1.3    65.2    +      -       -      +
    310B  PHE*     4.3     5.6    -      -       -      +
    311B  THR*     2.9    29.0    +      -       -      +
    318B  ALA*     3.7    23.6    -      -       +      -
    321B  ILE*     3.7    26.5    -      -       +      -
    322B  ASP*     4.7    11.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 308 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    249B  ARG      5.7     2.3    +      -       -      -
    252B  VAL*     3.3    43.8    -      -       -      +
    255B  ARG*     5.8     4.0    -      -       -      +
    304B  PHE*     2.9    28.7    +      -       +      +
    305B  ALA*     3.7     7.4    -      -       -      +
    306B  THR      3.3     0.2    -      -       -      -
    307B  VAL*     1.3    77.3    -      -       -      +
    309B  TYR*     1.3    58.5    +      -       -      +
    311B  THR*     3.8    14.7    -      -       -      +
    312B  LYS*     4.5    10.4    -      -       -      +
    409B  Y01      3.9    27.6    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 309 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    305B  ALA      3.6     8.6    +      -       -      +
    306B  THR*     3.2     9.7    +      -       -      +
    307B  VAL      3.0     0.6    -      -       -      -
    308B  ASN*     1.3    79.5    -      -       -      +
    310B  PHE*     1.3    88.8    +      +       -      +
    311B  THR      3.4     1.0    +      -       -      -
    312B  LYS*     3.8    33.9    +      -       -      +
    313B  SER*     4.7     2.4    +      -       -      -
    409B  Y01      5.5    10.1    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 310 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    306B  THR*     2.9    38.0    +      -       +      +
    307B  VAL*     4.3     4.5    -      -       -      +
    309B  TYR*     1.3   100.4    -      +       -      +
    311B  THR*     1.3    64.7    +      -       -      +
    312B  LYS      3.1     4.4    +      -       -      -
    313B  SER*     3.3    19.9    +      -       -      -
    314B  GLN      3.3    10.0    -      -       -      +
    317B  ARG*     4.8    28.6    -      -       +      +
    318B  ALA*     5.1     2.5    -      -       -      +
    321B  ILE*     4.1    22.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 311 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    249B  ARG*     3.9    32.4    -      -       -      +
    307B  VAL*     2.9    23.7    +      -       -      +
    308B  ASN*     3.8    18.4    -      -       -      +
    310B  PHE*     1.3    76.8    -      -       -      +
    312B  LYS*     1.3    69.5    +      -       +      +
    314B  GLN      3.9    16.8    -      -       -      +
    315B  PRO*     4.2    10.6    -      -       -      +
    318B  ALA*     3.9    16.4    -      -       -      +
----------------------------------------------------------
 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