Contacts of the helix formed by residues 399 - 421 (chain B) in PDB entry 1SIW


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with THR 399 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    387B  VAL*     4.2    20.0    -      -       +      -
    388B  GLN*     3.2    36.1    -      -       -      +
    391B  ALA*     3.7    18.6    -      -       +      -
    397B  GLY      3.4     1.5    +      -       -      +
    398B  ASP*     1.3    74.0    +      -       -      +
    400B  LYS*     1.3    67.7    +      -       -      +
    401B  PRO      3.5     0.2    -      -       -      -
    402B  VAL*     3.2     5.1    +      -       -      +
    403B  LEU*     3.0    35.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 400 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    398B  ASP*     3.0    15.0    +      -       -      +
    399B  THR*     1.3    80.4    +      -       -      +
    401B  PRO*     1.3    71.6    -      -       +      +
    403B  LEU*     3.3     8.6    +      -       -      +
    404B  ARG*     3.1    24.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PRO 401 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    293B  TYR*     3.8    30.5    -      -       +      -
    338B  LYS      4.8     1.0    -      -       -      +
    341B  LEU*     4.0    16.0    -      -       +      +
    395B  THR*     3.5    26.0    -      -       +      -
    398B  ASP*     3.5    21.3    -      -       +      +
    400B  LYS*     1.3    96.7    -      -       +      +
    402B  VAL*     1.3    59.9    +      -       -      +
    404B  ARG*     3.6    21.6    +      -       +      +
    405B  ALA*     3.2    22.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 402 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341B  LEU*     4.0    19.7    -      -       +      -
    357B  PRO*     4.5     6.5    -      -       +      -
    387B  VAL*     3.5    23.8    -      -       +      -
    390B  LEU*     3.8    22.7    -      -       +      +
    391B  ALA*     3.8    18.6    -      -       +      +
    394B  LEU*     4.9     2.2    -      -       +      -
    395B  THR*     3.7    23.6    -      -       +      +
    398B  ASP      4.3     0.9    -      -       -      +
    399B  THR      3.2     7.5    +      -       -      +
    401B  PRO*     1.3    74.3    -      -       -      +
    403B  LEU*     1.3    66.5    +      -       -      +
    405B  ALA*     3.3     4.0    +      -       -      +
    406B  LEU*     3.0    34.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 403 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    380B  VAL*     3.5    31.1    -      -       +      +
    381B  GLU*     5.9     0.7    -      -       -      +
    387B  VAL*     3.8    28.5    -      -       +      -
    399B  THR*     3.0    33.4    +      -       -      +
    400B  LYS*     3.7     6.7    -      -       -      +
    402B  VAL*     1.3    78.7    -      -       -      +
    404B  ARG*     1.3    52.2    +      -       -      +
    406B  LEU*     3.3     4.7    +      -       +      +
    407B  LYS*     2.8    51.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 404 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    293B  TYR*     3.4    32.9    +      -       -      -
    294B  GLN*     5.4     3.4    -      -       -      +
    338B  LYS*     3.9    39.2    +      -       -      +
    341B  LEU*     5.7     0.2    -      -       -      +
    400B  LYS*     3.1    17.7    +      -       +      +
    401B  PRO*     3.8    16.4    +      -       -      +
    403B  LEU*     1.3    76.1    -      -       -      +
    405B  ALA*     1.3    61.8    +      -       -      +
    407B  LYS*     3.4    13.6    -      -       -      +
    408B  ARG*     3.0    63.8    +      -       +      +
    433B  VAL*     5.4     2.0    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 405 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338B  LYS      3.7    15.2    +      -       -      +
    339B  LEU*     3.7    30.4    -      -       +      +
    341B  LEU*     4.8     2.2    -      -       +      -
    357B  PRO*     3.8    15.0    -      -       +      -
    401B  PRO      3.2    12.1    +      -       -      +
    402B  VAL*     3.3     8.0    +      -       -      +
    404B  ARG*     1.3    80.7    -      -       -      +
    406B  LEU*     1.3    63.3    +      -       -      +
    408B  ARG*     3.7     2.1    -      -       -      +
    409B  MET*     3.1    31.0    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 406 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    357B  PRO*     4.0    12.6    -      -       +      -
    358B  PRO      3.3    28.5    -      -       -      +
    359B  LEU*     3.6    19.5    -      -       +      +
    380B  VAL*     4.0    16.6    -      -       +      -
    383B  LEU*     4.1    16.4    -      -       +      -
    385B  ILE      6.1     0.4    -      -       -      +
    387B  VAL*     4.6     9.9    -      -       +      -
    390B  LEU*     4.4    10.1    -      -       +      -
    402B  VAL*     3.0    35.2    +      -       +      +
    403B  LEU*     3.8     2.9    -      -       +      +
    405B  ALA*     1.3    77.9    -      -       -      +
    407B  LYS*     1.3    62.1    +      -       -      +
    409B  MET*     3.3    15.2    +      -       +      +
    410B  LEU*     3.0    29.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 407 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    380B  VAL*     4.0    33.1    -      -       +      +
    381B  GLU*     5.2     2.2    -      -       -      +
    403B  LEU*     2.8    60.1    +      -       -      +
    404B  ARG*     3.4    13.2    -      -       -      +
    406B  LEU*     1.3    72.9    -      -       -      +
    408B  ARG*     1.3    57.9    +      -       -      +
    410B  LEU*     3.1     8.9    +      -       +      +
    411B  ALA*     2.8    28.4    +      -       -      +
    432B  GLU*     5.5    10.8    -      -       +      +
    433B  VAL*     3.7    25.0    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 408 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336B  GLU      4.0     6.1    +      -       -      -
    337B  TRP*     3.0    36.5    +      -       -      +
    338B  LYS*     4.6     4.0    -      -       -      +
    339B  LEU*     4.0    11.2    -      -       +      -
    404B  ARG*     3.0    52.7    +      -       +      +
    405B  ALA      3.7     3.4    -      -       -      +
    407B  LYS*     1.3    75.8    -      -       -      +
    409B  MET*     1.3    61.3    +      -       -      +
    411B  ALA*     3.3     8.4    +      -       -      +
    412B  MET*     3.0    22.9    +      -       -      +
    433B  VAL*     3.1    38.8    +      -       +      -
    434B  GLY*     4.0    11.5    +      -       -      -
    435B  LEU*     3.4    35.5    -      -       +      +
    439B  GLN*     5.6     1.0    -      -       -      +
    443B  MET*     4.0     5.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 409 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272A  TYR*     4.8    12.1    -      -       +      -
     12B  ASN*     5.4     1.1    -      -       -      -
     14B  ASP*     4.8    11.2    -      -       +      +
    339B  LEU*     4.2    17.3    -      -       +      -
    356B  VAL*     3.5    25.4    -      -       +      -
    357B  PRO*     3.2    26.5    -      -       +      +
    359B  LEU*     4.2    18.4    -      -       +      -
    405B  ALA      3.1    20.5    +      -       -      +
    406B  LEU*     3.7    23.1    -      -       +      +
    407B  LYS      3.2     0.2    -      -       -      -
    408B  ARG*     1.3    77.2    -      -       -      +
    410B  LEU*     1.3    62.7    +      -       -      +
    412B  MET*     3.4    15.1    +      -       +      +
    413B  ARG*     3.2    25.6    +      -       -      +
    443B  MET*     4.6     3.8    -      -       +      -
    447B  LEU*     5.2     7.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 410 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    359B  LEU*     3.8    26.9    -      -       +      -
    374B  ASN*     4.1    14.8    +      -       -      +
    377B  LEU*     5.1     2.7    -      -       +      +
    378B  PRO*     3.8    24.5    -      -       +      +
    379B  ASP*     3.8     2.2    -      -       -      +
    380B  VAL*     3.5    38.4    -      -       +      +
    383B  LEU*     4.4    14.6    -      -       +      -
    406B  LEU      3.0    19.1    +      -       -      +
    407B  LYS*     3.5     7.2    -      -       -      +
    409B  MET*     1.3    73.4    -      -       -      +
    411B  ALA*     1.3    66.1    +      -       -      +
    413B  ARG*     3.1    25.3    +      -       -      +
    414B  HIS*     2.9    21.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 411 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    374B  ASN*     5.1     2.0    -      -       -      +
    407B  LYS      2.8    16.1    +      -       -      +
    408B  ARG      3.5     5.8    -      -       -      +
    409B  MET      3.3     0.2    -      -       -      -
    410B  LEU*     1.3    74.5    -      -       -      +
    412B  MET*     1.3    66.5    +      -       -      +
    414B  HIS*     3.0     3.9    +      -       -      +
    415B  TYR*     2.9    24.4    +      -       -      +
    429B  ALA*     3.7    40.4    -      -       +      +
    430B  LEU*     4.1     8.2    -      -       +      +
    433B  VAL*     3.8    16.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 412 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272A  TYR*     3.4    49.8    -      -       +      +
    408B  ARG      3.0    13.3    +      -       -      +
    409B  MET*     3.5    15.5    -      -       +      +
    410B  LEU      3.3     0.2    -      -       -      -
    411B  ALA*     1.3    74.3    -      -       -      +
    413B  ARG*     1.3    58.4    +      -       -      +
    415B  TYR*     3.4     2.9    +      -       -      +
    416B  LYS*     2.9    45.7    +      -       +      +
    430B  LEU*     4.3    10.7    -      -       -      +
    435B  LEU*     5.7     0.2    -      -       +      -
    440B  ALA*     4.1    17.0    -      -       +      +
    443B  MET*     3.8    24.2    -      -       +      +
    444B  TYR*     3.7    31.6    -      -       +      -
    447B  LEU*     4.2    11.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 413 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    271A  ARG*     2.9    39.4    +      -       -      +
    272A  TYR*     4.1    22.0    -      -       +      -
    274A  GLY*     3.4    10.7    -      -       -      -
    275A  THR      3.0    22.8    +      -       -      -
    292A  ASP*     2.7    45.6    +      -       -      -
    359B  LEU*     4.1    17.6    -      -       -      +
    377B  LEU*     3.8    22.9    -      -       +      +
    378B  PRO*     3.9    12.3    -      -       -      +
    409B  MET      3.2    14.8    -      -       -      +
    410B  LEU*     3.1    25.9    +      -       +      +
    412B  MET*     1.3    77.1    -      -       +      +
    414B  HIS*     1.3    57.3    +      -       -      +
    416B  LYS      3.3     0.7    +      -       -      -
    417B  ARG*     2.9    27.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 414 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    373B  SER      3.9     1.8    +      -       -      -
    374B  ASN*     3.5    48.6    -      -       +      +
    375B  GLY*     5.1     0.6    +      -       -      -
    377B  LEU*     3.8    10.5    -      -       +      +
    410B  LEU      2.9    12.5    +      -       -      +
    411B  ALA      3.0     7.6    +      -       -      +
    413B  ARG*     1.3    77.0    -      -       -      +
    415B  TYR*     1.3    63.7    +      -       -      +
    417B  ARG*     3.3     2.6    +      -       -      +
    418B  ALA*     3.1    22.1    +      -       +      +
    426B  ASP*     3.2    43.6    +      -       +      -
    428B  ARG*     3.6    20.4    +      -       -      -
    429B  ALA*     3.6    16.4    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 415 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    411B  ALA      2.9    15.0    +      -       -      +
    412B  MET      3.7     2.0    -      -       -      +
    414B  HIS*     1.3    77.0    +      -       -      +
    416B  LYS*     1.3    77.1    +      -       +      +
    418B  ALA*     3.4     5.1    +      -       -      +
    419B  GLU*     3.2    41.9    +      -       +      +
    424B  LYS      4.9     0.8    -      -       -      +
    425B  VAL*     4.7     6.7    -      -       +      -
    426B  ASP      3.7    26.7    -      -       -      +
    427B  THR*     4.1     4.7    -      -       +      -
    430B  LEU*     3.6    24.9    -      -       +      -
    437B  GLU*     3.2    43.8    +      -       +      +
    440B  ALA*     4.0    20.6    -      -       +      -
    441B  GLN*     2.9    34.1    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 416 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272A  TYR      3.2    15.7    -      -       -      +
    273A  LYS*     3.4    21.1    -      -       -      +
    412B  MET*     2.9    27.9    +      -       +      +
    413B  ARG      3.8     0.7    -      -       -      +
    415B  TYR*     1.3    93.0    -      -       +      +
    417B  ARG*     1.3    58.2    +      -       -      +
    419B  GLU*     3.1    28.2    +      -       -      +
    420B  THR*     2.9    41.9    +      -       -      +
    440B  ALA      5.1     1.6    -      -       -      +
    441B  GLN*     3.5    17.1    -      -       -      +
    444B  TYR*     3.8    45.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 417 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    247A  SER      2.9    22.4    +      -       -      -
    248A  TYR*     4.3     3.8    -      -       -      -
    273A  LYS      3.6     2.4    +      -       -      -
    274A  GLY*     2.7    43.4    +      -       -      +
    275A  THR*     3.8     0.4    -      -       -      +
    276A  LYS      3.8     4.4    -      -       -      +
    528A  ASN*     3.1    29.3    +      -       -      +
    531A  LYS*     6.0     1.2    -      -       -      +
    376B  ILE*     3.4    34.6    -      -       -      +
    377B  LEU*     4.2    15.9    -      -       +      -
    413B  ARG      2.9    16.9    +      -       -      +
    414B  HIS*     3.7     4.5    -      -       -      +
    416B  LYS*     1.3    74.0    -      -       -      +
    418B  ALA*     1.3    67.6    +      -       -      +
    420B  THR*     4.0     2.5    -      -       -      -
    421B  VAL*     2.8    48.8    +      -       +      +
    422B  ASP*     3.6     4.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 418 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    414B  HIS*     3.1    12.8    +      -       +      +
    415B  TYR*     3.6     9.0    -      -       -      +
    417B  ARG*     1.3    75.8    -      -       -      +
    419B  GLU*     1.3    59.0    +      -       -      +
    422B  ASP*     3.1    20.4    +      -       -      +
    423B  GLY      2.8    25.1    +      -       -      -
    424B  LYS*     3.0    21.5    +      -       +      +
    426B  ASP*     3.7    29.2    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 419 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    415B  TYR*     3.2    26.6    +      -       +      +
    416B  LYS*     3.1    31.7    +      -       -      +
    417B  ARG      3.1     0.4    -      -       -      -
    418B  ALA*     1.3    81.2    -      -       -      +
    420B  THR*     1.3    66.9    +      -       +      +
    423B  GLY*     3.2    21.5    +      -       -      -
    424B  LYS      3.3    13.2    +      -       -      +
    425B  VAL*     6.0     0.4    -      -       -      -
    441B  GLN*     3.6    19.8    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 420 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    247A  SER*     5.8     0.3    -      -       -      -
    273A  LYS*     3.2    45.9    +      -       +      +
    535A  ARG*     3.0    22.9    +      -       -      -
    416B  LYS*     2.9    25.0    +      -       -      +
    417B  ARG*     3.9     2.8    +      -       -      -
    419B  GLU*     1.3    91.3    -      -       +      +
    421B  VAL*     1.3    67.6    +      -       -      +
    423B  GLY*     4.6     0.7    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 421 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    247A  SER*     3.4    30.7    -      -       -      -
    274A  GLY      5.8     1.1    -      -       -      -
    528A  ASN*     4.2     6.5    -      -       -      +
    531A  LYS*     4.1    30.3    -      -       +      +
    532A  THR*     4.1    20.1    -      -       +      +
    535A  ARG*     4.4     4.4    +      -       -      +
    417B  ARG*     2.8    47.4    +      -       +      +
    420B  THR*     1.3    83.7    -      -       -      +
    422B  ASP*     1.3    67.3    +      -       -      +
    423B  GLY      3.4     0.2    -      -       -      -
----------------------------------------------------------
 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