Contacts of the helix formed by residues 349 - 371 (chain B) in PDB entry 3VF1


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 349 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    348B  ASP*     1.3    79.4    -      -       -      +
    350B  GLU*     1.3    59.8    +      -       -      +
    351B  TRP*     3.9     5.4    +      -       -      +
    352B  ASP*     3.1    31.1    +      -       -      +
    353B  TRP*     3.0    26.9    +      -       -      +
    585B  LYS*     6.5     0.2    -      -       +      -
    586B  GLY*     4.6    18.5    -      -       -      +
    588B  SER      5.1     1.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 350 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    348B  ASP      5.5     0.2    -      -       -      +
    349B  THR*     1.3    74.5    -      -       -      +
    351B  TRP*     1.3    66.2    +      -       +      +
    353B  TRP*     3.4     7.6    +      -       -      +
    354B  ILE*     3.1    32.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TRP 351 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    210B  LEU*     4.2    14.8    -      -       +      -
    233B  ARG*     4.5     9.6    -      -       -      -
    349B  THR*     3.4     4.1    +      -       -      +
    350B  GLU*     1.3    78.0    -      -       +      +
    352B  ASP*     1.3    66.4    +      -       -      +
    354B  ILE*     3.3    23.9    +      -       +      +
    355B  MET*     3.0    22.7    +      -       -      +
    588B  SER*     3.4    27.0    -      -       -      +
    589B  ASN*     3.8    11.4    -      -       +      +
    590B  HIS*     3.6    52.1    -      +       +      +
    593B  ILE*     3.6    30.4    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 352 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    343B  TRP*     3.3    35.2    -      -       +      -
    348B  ASP*     4.2     3.8    -      -       +      +
    349B  THR*     3.1    31.6    +      -       -      +
    351B  TRP*     1.3    77.7    -      -       -      +
    353B  TRP*     1.3    56.5    +      -       -      +
    355B  MET*     3.1     4.2    +      -       -      +
    356B  ALA*     2.9    28.6    +      -       -      +
    584B  GLU      5.1     0.5    -      -       -      +
    585B  LYS*     3.5     4.9    -      -       -      +
    586B  GLY*     2.7    27.1    +      -       -      -
    587B  LYS*     3.9     0.7    +      -       -      +
    588B  SER*     2.7    43.4    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TRP 353 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    235B  ASP*     3.1    26.4    +      -       -      -
    327B  PRO*     3.7    30.5    -      -       +      -
    329B  ALA      4.0    11.4    -      -       -      -
    330B  ILE*     3.8    30.3    -      -       +      -
    343B  TRP*     3.7    20.9    -      -       +      -
    344B  THR      3.9     8.1    -      -       -      +
    345B  PRO*     3.6    53.1    -      -       +      +
    348B  ASP*     4.8     2.6    -      -       +      +
    349B  THR      3.0    17.2    +      -       -      +
    350B  GLU*     3.7     8.1    -      -       -      +
    352B  ASP*     1.3    75.7    -      -       -      +
    354B  ILE*     1.3    63.5    +      -       +      +
    356B  ALA*     3.3     7.0    +      -       +      +
    357B  LYS*     3.0    48.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 354 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    210B  LEU*     5.5     0.4    -      -       +      -
    232B  TRP*     4.4    18.6    -      -       +      -
    233B  ARG*     4.4    26.0    -      -       +      +
    350B  GLU*     3.1    22.1    +      -       +      +
    351B  TRP*     3.6    28.9    -      -       +      +
    352B  ASP      3.2     0.2    -      -       -      -
    353B  TRP*     1.3    75.3    -      -       +      +
    355B  MET*     1.3    67.6    +      -       -      +
    357B  LYS*     3.3    21.9    +      -       -      +
    358B  LEU*     3.1    33.3    +      -       +      +
    593B  ILE*     3.9    17.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 355 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    343B  TRP*     6.4     0.2    -      -       +      -
    351B  TRP      3.0    13.6    +      -       -      +
    352B  ASP      3.1     8.0    +      -       -      +
    354B  ILE*     1.3    77.6    -      -       -      +
    356B  ALA*     1.3    64.2    +      -       -      +
    358B  LEU*     3.1    22.9    +      -       -      +
    359B  TRP*     3.2    50.5    +      -       +      -
    577B  MET*     5.4     1.1    -      -       -      -
    582B  PRO*     4.1    22.7    -      -       +      -
    588B  SER*     3.7    18.4    -      -       -      +
    592B  VAL*     4.0    19.5    -      -       +      -
    593B  ILE*     3.4    40.8    -      -       +      +
    596B  SER*     4.4    14.1    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 356 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330B  ILE*     3.8    24.4    -      -       +      +
    332B  LEU*     4.2     9.6    -      -       -      +
    343B  TRP*     3.8    38.8    -      -       +      -
    352B  ASP      2.9    12.7    +      -       -      +
    353B  TRP*     3.6    10.3    -      -       +      +
    354B  ILE      3.3     0.2    -      -       -      -
    355B  MET*     1.3    77.2    -      -       -      +
    357B  LYS*     1.3    62.3    +      -       -      +
    359B  TRP*     3.4     5.8    +      -       -      +
    360B  LEU*     3.2    16.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 357 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    232B  TRP*     5.0     2.3    +      -       -      -
    233B  ARG*     3.2    25.3    +      -       -      +
    234B  ASP      4.8     0.2    -      -       -      -
    235B  ASP*     2.8    24.8    +      -       -      +
    238B  PHE*     3.5    39.3    -      -       +      +
    330B  ILE*     3.9    11.0    -      -       +      -
    353B  TRP*     3.0    58.4    +      -       +      +
    354B  ILE*     3.6    20.4    -      -       -      +
    356B  ALA*     1.3    74.3    -      -       -      +
    358B  LEU*     1.3    64.7    +      -       +      +
    360B  LEU*     3.2     3.6    +      -       -      +
    361B  ARG*     3.1    26.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 358 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    232B  TRP*     3.9    17.9    -      -       +      -
    354B  ILE*     3.1    31.8    +      -       +      +
    355B  MET*     3.1    14.3    +      -       -      +
    357B  LYS*     1.3    76.7    -      -       +      +
    359B  TRP*     1.3    58.3    +      -       +      +
    361B  ARG*     3.4     4.0    +      -       +      +
    362B  CYS*     3.0    27.4    +      -       -      +
    571B  PRO*     3.2    31.6    -      -       +      +
    574B  PRO*     3.7    17.4    -      -       +      +
    577B  MET*     3.9    15.3    -      -       +      -
    593B  ILE*     3.7    29.6    -      -       +      -
    597B  LEU*     4.3    11.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TRP 359 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    309B  TYR*     3.9    17.0    -      -       +      -
    310B  ILE*     3.9    15.8    -      -       +      +
    311B  THR*     3.7    26.9    +      -       +      +
    313B  PRO*     4.3     5.1    -      -       -      +
    332B  LEU*     3.7    25.8    -      -       +      -
    355B  MET*     3.2    50.1    +      -       +      +
    356B  ALA      3.8     2.0    -      -       -      +
    357B  LYS      3.2     0.4    -      -       -      -
    358B  LEU*     1.3    76.8    -      -       -      +
    360B  LEU*     1.3    63.8    +      -       -      +
    362B  CYS*     3.7     4.8    -      -       +      +
    363B  ALA*     3.3    20.8    +      -       -      +
    577B  MET*     3.2    41.7    -      -       +      +
    579B  GLN      3.1    28.0    -      -       -      -
    580B  PRO      3.7     1.6    -      -       -      -
    581B  PRO*     3.5    32.0    -      -       +      +
    582B  PRO*     4.5     5.2    -      -       +      -
    596B  SER*     4.6     3.4    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 360 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    238B  PHE*     4.1    11.2    -      -       +      -
    242B  PHE*     4.0    23.3    -      -       +      -
    290B  THR*     4.0     5.4    -      -       -      +
    292B  TYR*     3.9    18.8    -      -       +      -
    313B  PRO*     3.8    28.5    -      -       +      -
    314B  LEU      4.3     1.3    -      -       -      +
    315B  GLY*     4.0    24.5    -      -       -      +
    317B  PHE*     4.2     7.9    -      -       +      -
    327B  PRO*     5.8     0.4    -      -       +      -
    330B  ILE*     3.9    23.3    -      -       +      -
    332B  LEU*     5.1     0.4    -      -       -      +
    356B  ALA      3.2    12.2    +      -       -      +
    357B  LYS      3.2     9.7    +      -       -      +
    359B  TRP*     1.3    75.9    -      -       -      +
    361B  ARG*     1.3    63.5    +      -       -      +
    363B  ALA*     3.4     6.1    +      -       -      +
    364B  ASP*     3.2    19.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 361 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    238B  PHE*     3.2    37.0    -      -       +      -
    241B  GLN*     3.8    35.5    +      -       -      +
    242B  PHE*     3.6    33.5    -      -       -      -
    246B  SER      5.9     1.2    -      -       -      +
    357B  LYS      3.1     7.6    +      -       -      +
    358B  LEU*     3.8     2.0    -      -       +      +
    360B  LEU*     1.3    73.6    -      -       -      +
    362B  CYS*     1.3    61.5    +      -       -      +
    364B  ASP*     3.0    26.7    +      -       -      +
    365B  THR*     2.9    31.4    +      -       -      -
    566B  THR*     4.0    14.3    -      -       -      +
    571B  PRO      5.6     1.1    -      -       -      +
    572B  ASN*     3.1    22.2    +      -       -      +
    573B  SER*     3.3    23.6    +      -       -      -
    574B  PRO*     3.7    20.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with CYS 362 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    310B  ILE*     3.4    22.4    -      -       +      -
    358B  LEU      3.0    17.7    +      -       -      +
    359B  TRP*     3.7    10.3    -      -       +      +
    360B  LEU      3.3     0.4    -      -       -      -
    361B  ARG*     1.3    76.9    -      -       -      +
    363B  ALA*     1.3    62.1    +      -       -      +
    365B  THR*     3.2     7.4    +      -       -      -
    366B  GLN*     3.0    26.6    +      -       -      -
    574B  PRO*     3.3    25.5    -      -       +      +
    576B  LEU*     3.9    32.8    -      -       -      -
    577B  MET*     4.1    10.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 363 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292B  TYR*     4.2     7.8    -      -       +      -
    295B  LEU*     3.6    27.7    -      -       +      +
    310B  ILE*     3.8    10.2    -      -       +      +
    311B  THR*     4.7     0.4    -      -       -      +
    313B  PRO*     3.5    34.8    -      -       +      -
    359B  TRP      3.3     5.7    +      -       -      +
    360B  LEU      3.6     4.7    -      -       -      +
    362B  CYS*     1.3    78.6    -      -       -      +
    364B  ASP*     1.3    62.8    +      -       -      +
    366B  GLN*     3.2     7.0    +      -       -      +
    367B  TYR*     3.2    19.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 364 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242B  PHE*     4.1     9.9    -      -       +      -
    247B  ASN*     3.0    34.9    +      -       -      +
    250B  VAL*     4.1     2.8    -      -       -      +
    292B  TYR*     2.6    36.1    +      -       -      +
    360B  LEU      3.2     8.5    +      -       -      +
    361B  ARG*     3.0    36.4    +      -       -      +
    363B  ALA*     1.3    78.8    -      -       -      +
    365B  THR*     1.3    58.1    +      -       -      +
    367B  TYR*     3.2     2.1    +      -       -      +
    368B  HIS*     2.8    28.1    +      -       -      +
    567B  TYR*     5.4     0.9    +      -       -      -
    573B  SER*     5.0     1.0    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 365 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    361B  ARG      2.9     8.7    +      -       -      -
    362B  CYS      3.2     4.7    +      -       -      -
    364B  ASP*     1.3    75.3    +      -       -      +
    366B  GLN*     1.3    66.2    +      -       -      +
    368B  HIS*     3.2     0.4    +      -       -      -
    369B  GLN*     3.0    28.0    +      -       +      +
    431B  LEU*     4.1    11.2    -      -       +      -
    567B  TYR*     3.5    30.9    -      -       +      +
    573B  SER*     2.9    26.0    +      -       -      -
    574B  PRO      2.9    26.8    +      -       -      +
    575B  THR*     3.9    17.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 366 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295B  LEU*     4.0    16.2    -      -       +      -
    310B  ILE*     3.9    17.9    -      -       +      -
    362B  CYS*     3.0    24.8    +      -       -      +
    363B  ALA*     3.2     7.8    +      -       -      +
    365B  THR*     1.3    79.1    -      -       -      +
    367B  TYR*     1.3    63.3    +      -       -      +
    369B  GLN*     4.2     0.3    -      -       -      -
    370B  MET*     3.3    28.4    +      -       -      +
    431B  LEU*     3.7    13.9    -      -       -      +
    432B  SER*     3.5    13.7    +      -       -      -
    433B  ILE*     3.3    44.0    +      -       +      +
    441B  LEU*     3.7     3.5    -      -       -      +
    575B  THR      2.8    29.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 367 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    247B  ASN*     3.6    11.9    -      -       -      +
    249B  GLU*     4.2    15.7    +      -       +      +
    250B  VAL*     3.9    22.5    -      -       +      +
    291B  ASP      5.9     2.2    -      -       -      -
    292B  TYR*     4.2    17.0    -      +       +      -
    294B  ILE*     4.0    24.2    -      -       +      -
    295B  LEU*     5.3     2.9    -      -       +      +
    363B  ALA      3.2     8.9    +      -       -      +
    364B  ASP      3.4     8.7    -      -       -      +
    365B  THR      3.2     0.2    -      -       -      -
    366B  GLN*     1.3    79.1    -      -       -      +
    368B  HIS*     1.3    56.0    +      -       -      +
    371B  ILE*     2.9    56.9    +      -       +      +
    372B  THR*     3.1    26.2    +      -       -      -
    376B  ARG*     5.5     0.2    -      -       -      -
    441B  LEU*     4.5     7.8    -      -       -      +
    445B  HIS*     4.1    17.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 368 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    246B  SER*     2.9    32.4    +      -       -      -
    247B  ASN*     3.7    15.5    -      -       +      +
    364B  ASP*     2.8    20.4    +      -       -      +
    365B  THR*     3.2     0.9    +      -       -      +
    367B  TYR*     1.3    73.4    -      -       -      +
    369B  GLN*     1.3    64.2    +      -       -      +
    372B  THR*     3.3    18.6    +      -       +      -
    373B  HIS*     2.8    35.5    +      -       +      +
    559B  VAL*     2.8    29.5    +      -       +      +
    563B  GLN*     3.5    28.9    -      -       +      -
    567B  TYR*     2.8    29.5    +      +       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 369 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    365B  THR*     3.0    24.6    +      -       +      +
    366B  GLN      4.2     0.2    -      -       -      +
    368B  HIS*     1.3    81.3    +      -       -      +
    370B  MET*     1.3    62.1    +      -       -      +
    373B  HIS*     3.6    11.1    +      -       -      +
    374B  LEU*     3.2    35.2    +      -       +      +
    427B  ALA*     6.2     0.4    -      -       +      -
    430B  VAL*     6.1     0.7    -      -       +      -
    431B  LEU*     4.1    32.1    -      -       +      -
    563B  GLN*     2.9    27.9    +      -       -      +
    567B  TYR*     3.5    24.2    -      -       -      -
    606B  MET*     3.8    17.0    -      -       +      +
    613B  LEU*     4.5     8.5    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 370 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    366B  GLN      3.3    15.6    +      -       -      +
    369B  GLN*     1.3    81.6    -      -       -      +
    371B  ILE*     1.3    60.9    +      -       -      +
    374B  LEU*     3.7    23.3    -      -       +      -
    375B  LEU*     3.0    27.6    +      -       -      +
    421B  ILE*     4.9     3.8    -      -       +      -
    427B  ALA*     4.2     7.6    -      -       +      -
    431B  LEU*     3.6    29.4    -      -       +      -
    433B  ILE*     4.0    12.1    -      -       +      -
    438B  GLN*     3.3    41.3    -      -       +      +
    441B  LEU*     4.0    10.5    -      -       +      -
    442B  MET*     3.4    28.9    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 371 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    294B  ILE*     3.7    29.4    -      -       +      -
    367B  TYR*     2.9    44.9    +      -       +      +
    370B  MET*     1.3    79.9    -      -       -      +
    372B  THR*     1.3    61.8    +      -       -      +
    373B  HIS      3.5     0.2    +      -       -      -
    375B  LEU*     3.6     3.3    -      -       -      +
    376B  ARG*     2.9    48.5    +      -       -      +
    441B  LEU*     3.8    31.6    -      -       +      +
    442B  MET*     4.8     2.0    -      -       -      -
    445B  HIS*     3.8    36.3    -      -       +      +
----------------------------------------------------------
 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