Contacts of the helix formed by residues 351 - 377 (chain A) in PDB entry 2CFZ


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 ASN 351 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    334A  GLY      2.7    29.7    +      -       -      -
    335A  ARG      3.3    18.6    +      -       -      +
    336A  GLN      4.0     1.4    -      -       -      -
    337A  ALA*     3.0    26.8    +      -       -      +
    338A  GLU*     4.8     3.6    +      -       +      +
    350A  GLY*     1.3    71.6    -      -       -      -
    352A  ALA*     1.3    59.6    +      -       -      +
    354A  ILE*     3.2     3.4    +      -       -      +
    355A  VAL*     2.8    37.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 352 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    350A  GLY      3.4     1.0    -      -       -      -
    351A  ASN*     1.3    79.2    +      -       -      +
    353A  GLU*     1.3    57.6    +      -       -      +
    355A  VAL*     3.4     5.8    +      -       -      +
    356A  GLU*     3.0    29.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 353 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  ARG*     3.7    15.6    +      -       -      +
    348A  ARG*     2.2    55.4    +      -       +      +
    349A  TRP      3.8    15.0    -      -       -      +
    350A  GLY*     3.2     9.7    +      -       -      +
    351A  ASN      3.2     0.6    -      -       -      -
    352A  ALA*     1.3    76.4    -      -       -      +
    354A  ILE*     1.3    59.3    +      -       -      +
    356A  GLU*     3.2    16.7    +      -       -      +
    357A  VAL*     2.9    45.1    +      -       -      +
    398A  GLU*     5.6     0.2    -      -       -      +
    400A  TYR*     4.2     2.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 354 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295A  LEU*     5.0     0.4    -      -       +      -
    334A  GLY      4.5     4.5    -      -       -      +
    337A  ALA*     3.7    27.6    -      -       +      +
    338A  GLU      3.4     9.4    -      -       -      +
    339A  VAL*     3.4    38.6    -      -       -      +
    340A  MET*     4.0    25.6    -      -       +      -
    348A  ARG*     3.6    17.9    -      -       -      +
    350A  GLY      3.0    19.5    +      -       -      +
    351A  ASN*     3.5     5.6    -      -       -      +
    353A  GLU*     1.3    73.9    -      -       -      +
    355A  VAL*     1.3    65.3    +      -       -      +
    357A  VAL*     3.2     2.3    +      -       -      +
    358A  LEU*     3.0    42.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 355 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330A  LEU*     4.1    18.5    -      -       +      +
    334A  GLY      3.7    24.7    -      -       -      +
    335A  ARG*     4.6     2.5    -      -       -      +
    351A  ASN*     2.8    35.2    +      -       -      +
    352A  ALA*     3.8     6.7    -      -       -      +
    354A  ILE*     1.3    74.1    -      -       -      +
    356A  GLU*     1.3    63.1    +      -       -      +
    358A  LEU*     3.3     2.1    +      -       -      +
    359A  GLU*     3.0    44.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 356 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    352A  ALA      3.0    17.0    +      -       -      +
    353A  GLU*     3.2    17.7    +      -       -      +
    355A  VAL*     1.3    78.1    -      -       -      +
    357A  VAL*     1.3    55.4    +      -       +      +
    359A  GLU*     3.5    13.9    +      -       -      +
    360A  LYS*     3.0    61.5    +      -       +      +
    398A  GLU*     4.2     8.9    -      -       -      +
    400A  TYR*     4.3     4.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 357 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    301A  VAL*     4.1    16.8    -      -       +      -
    340A  MET*     3.7    22.4    -      -       +      -
    348A  ARG*     3.2    22.9    -      -       -      +
    353A  GLU*     2.9    44.4    +      -       -      +
    354A  ILE      3.2     3.3    +      -       -      +
    356A  GLU*     1.3    71.7    -      -       -      +
    358A  LEU*     1.3    61.1    +      -       -      +
    360A  LYS*     3.3     0.5    +      -       -      +
    361A  GLN*     2.8    36.9    +      -       +      +
    400A  TYR*     3.7    34.8    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 358 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295A  LEU*     4.0    11.9    -      -       +      -
    297A  MET*     3.9    25.1    -      -       +      -
    301A  VAL*     4.1     6.1    -      -       +      -
    326A  ILE*     3.3    18.0    -      -       +      +
    330A  LEU*     3.9    27.6    -      -       +      +
    334A  GLY*     3.9    28.9    -      -       -      -
    340A  MET*     3.6    20.9    -      -       -      -
    354A  ILE*     3.0    27.2    +      -       +      +
    355A  VAL      3.7     3.4    -      -       -      +
    357A  VAL*     1.3    75.9    -      -       -      +
    359A  GLU*     1.3    56.7    +      -       -      +
    361A  GLN*     4.8     0.9    -      -       -      -
    362A  ARG*     2.8    32.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 359 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330A  LEU*     3.7    18.6    -      -       +      +
    355A  VAL*     3.0    35.1    +      -       +      +
    356A  GLU*     3.7    17.1    -      -       -      +
    358A  LEU*     1.3    75.2    -      -       -      +
    360A  LYS*     1.3    60.7    +      -       +      +
    362A  ARG*     3.3    26.6    +      -       -      +
    363A  ASP*     2.8    38.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 360 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    356A  GLU*     3.0    42.3    +      -       +      +
    357A  VAL      4.0     1.8    -      -       -      +
    359A  GLU*     1.3    78.7    -      -       +      +
    361A  GLN*     1.3    53.7    +      -       -      +
    363A  ASP*     3.3     2.3    +      -       -      +
    364A  LEU*     2.7    34.7    +      -       -      +
    394A  SER*     2.8    42.1    +      -       -      +
    395A  LEU*     3.4    19.7    -      -       +      +
    397A  GLN      5.5     0.2    +      -       -      -
    398A  GLU*     2.7    34.8    +      -       +      -
    400A  TYR*     3.7    17.9    -      -       +      +
    401A  ASP*     4.1     3.1    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 361 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    300A  ASN      4.1     0.2    -      -       -      +
    301A  VAL*     3.6    41.0    -      -       +      +
    302A  VAL      3.9     7.5    +      -       -      +
    304A  THR      3.9     7.2    +      -       -      +
    326A  ILE*     4.0    13.0    -      -       +      -
    357A  VAL*     2.8    20.3    +      -       +      +
    358A  LEU      4.1     2.0    -      -       -      +
    360A  LYS*     1.3    74.3    -      -       -      +
    362A  ARG*     1.3    65.2    +      -       -      +
    364A  LEU*     3.2    24.5    +      -       -      +
    365A  TYR*     3.2    34.9    +      -       +      -
    400A  TYR*     2.9    40.9    +      -       +      -
    401A  ASP*     3.2    12.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 362 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    323A  SER*     2.7    46.5    +      -       -      +
    326A  ILE*     3.8    21.3    -      -       +      +
    327A  ASN*     3.1    40.5    +      -       +      +
    330A  LEU*     3.6    16.3    -      -       +      +
    331A  HIS*     4.7     3.4    +      -       -      -
    358A  LEU      2.8    21.8    +      -       -      +
    359A  GLU*     3.5    24.3    +      -       -      +
    361A  GLN*     1.3    72.6    -      -       -      +
    363A  ASP*     1.3    92.7    +      -       -      +
    366A  GLY*     3.1    14.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 363 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    359A  GLU*     2.8    24.6    +      -       -      +
    360A  LYS*     3.9     3.4    -      -       -      +
    362A  ARG*     1.3   111.3    +      -       -      +
    364A  LEU*     1.3    56.8    +      -       -      +
    366A  GLY*     4.4     1.8    -      -       -      +
    367A  TYR*     2.7    37.1    +      -       -      +
    395A  LEU*     3.7    15.9    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 364 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    305A  LEU*     3.7    34.8    -      -       +      -
    360A  LYS      2.7    21.8    +      -       -      +
    361A  GLN*     3.2    35.0    +      -       -      +
    363A  ASP*     1.3    75.1    -      -       -      +
    365A  TYR*     1.3    68.5    +      -       +      +
    367A  TYR*     3.9     1.7    -      -       -      +
    368A  LEU*     3.1    31.3    +      -       +      +
    391A  LEU*     3.7    34.5    -      -       +      +
    395A  LEU*     4.0     9.6    -      -       +      -
    401A  ASP*     3.6    25.6    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 365 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    300A  ASN      4.3     2.3    +      -       -      -
    302A  VAL*     5.7     0.3    -      -       -      +
    304A  THR      4.1     3.3    +      -       -      -
    305A  LEU*     3.7    25.4    -      -       +      -
    306A  HIS*     2.8    42.1    +      -       -      +
    308A  LEU*     4.1    24.9    -      -       +      -
    319A  ALA*     3.6    24.1    -      -       +      +
    322A  TRP*     3.6    42.1    -      +       +      -
    323A  SER*     4.1     8.7    -      -       -      +
    326A  ILE*     3.9     5.6    -      -       +      -
    361A  GLN*     3.2    41.2    +      -       -      +
    364A  LEU*     1.3    81.3    -      -       +      +
    366A  GLY*     1.3    57.0    +      -       -      +
    368A  LEU*     3.7     5.6    +      -       +      +
    369A  HIS*     3.1    28.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 366 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    320A  LEU*     6.0     3.6    -      -       -      -
    323A  SER*     3.7    12.3    -      -       -      -
    362A  ARG      3.1    18.1    +      -       -      -
    363A  ASP*     3.8     1.8    -      -       -      -
    365A  TYR*     1.3    75.8    -      -       -      +
    367A  TYR*     1.3    59.9    +      -       -      +
    369A  HIS*     3.4     4.7    +      -       -      +
    370A  ASP*     2.8    40.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 367 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    363A  ASP      2.7    23.2    +      -       -      +
    364A  LEU      3.9     2.9    -      -       -      +
    366A  GLY*     1.3    70.5    -      -       -      +
    368A  LEU*     1.3    61.7    +      -       -      +
    370A  ASP*     4.5     2.2    -      -       -      +
    371A  GLN*     2.8    65.3    +      -       +      +
    389A  LEU*     3.5    23.7    -      -       +      +
    390A  ARG      3.0    25.4    +      -       -      -
    391A  LEU*     3.8    19.3    -      -       +      -
    392A  PRO*     3.6    32.9    -      -       +      +
    395A  LEU*     4.0     8.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 368 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    305A  LEU*     3.7    33.4    -      -       +      -
    308A  LEU*     4.6    12.6    -      -       +      -
    364A  LEU*     3.1    23.5    +      -       +      +
    365A  TYR*     3.8     8.3    -      -       +      +
    367A  TYR*     1.3    76.6    -      -       -      +
    369A  HIS*     1.3    62.3    +      -       -      +
    372A  THR*     2.6    32.0    +      -       -      +
    389A  LEU*     4.3    13.2    -      -       +      -
    391A  LEU*     4.4    12.3    -      -       +      -
    408A  VAL*     4.0    37.7    -      -       +      +
    411A  ASN*     4.0    20.4    -      -       +      +
    412A  ALA*     4.8     3.1    -      -       +      +
    415A  VAL*     4.1     4.0    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 369 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    318A  ASP*     5.1     0.4    -      -       -      -
    319A  ALA*     3.9    13.2    -      -       +      +
    320A  LEU*     3.8    42.6    -      -       +      +
    365A  TYR      3.1    16.4    +      -       -      +
    366A  GLY*     3.6     6.1    -      -       -      +
    368A  LEU*     1.3    81.8    -      -       -      +
    370A  ASP*     1.3    85.9    +      -       -      +
    372A  THR*     3.7     2.8    -      -       -      -
    373A  LEU*     3.2    41.3    +      -       +      +
    415A  VAL*     3.9    13.7    -      -       +      +
    419A  TYR*     2.6    42.1    +      +       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 370 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    320A  LEU*     4.6     7.6    -      -       -      +
    366A  GLY*     2.8    26.8    +      -       -      +
    367A  TYR*     4.2     2.2    -      -       -      +
    369A  HIS*     1.3    99.0    +      -       -      +
    371A  GLN*     1.3    60.9    +      -       +      +
    373A  LEU*     3.3     7.4    +      -       -      +
    374A  HIS*     2.8    32.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 371 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    367A  TYR*     2.8    57.8    +      -       +      +
    370A  ASP*     1.3    79.0    -      -       +      +
    372A  THR*     1.3    65.5    +      -       -      +
    374A  HIS*     3.6    30.7    +      -       -      +
    375A  LEU*     3.0    30.8    +      -       -      +
    389A  LEU*     3.5    23.7    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 372 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    368A  LEU      2.6    25.5    +      -       -      -
    369A  HIS      3.7     2.9    -      -       -      -
    371A  GLN*     1.3    77.0    -      -       -      +
    373A  LEU*     1.3    58.0    +      -       +      +
    375A  LEU*     3.3     4.3    +      -       -      +
    376A  ALA*     2.8    27.0    +      -       -      +
    385A  VAL*     4.1    14.5    -      -       +      +
    389A  LEU*     3.2    18.8    -      -       -      +
    412A  ALA*     3.3    33.7    -      -       -      +
    415A  VAL*     3.8     8.2    -      -       +      +
    416A  LEU*     3.7    26.0    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 373 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    369A  HIS*     3.2    44.9    +      -       +      +
    370A  ASP*     3.5     8.3    -      -       -      +
    372A  THR*     1.3    78.8    -      -       +      +
    374A  HIS*     1.3    60.9    +      -       -      +
    376A  ALA*     3.7    10.2    -      -       +      +
    377A  ASN*     2.8    43.7    +      -       -      +
    415A  VAL*     3.9    10.8    -      -       +      +
    416A  LEU*     5.2     2.2    -      -       -      -
    419A  TYR*     3.7    42.8    -      -       +      -
    420A  LEU*     6.1     1.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 374 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    370A  ASP      2.8    17.0    +      -       -      +
    371A  GLN*     3.6    31.6    +      -       -      +
    373A  LEU*     1.3    79.1    -      -       -      +
    375A  LEU*     1.3    62.9    +      -       -      +
    377A  ASN*     3.3    11.1    +      -       -      +
    378A  GLN*     3.2    48.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 375 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    371A  GLN*     3.0    23.8    +      -       -      +
    372A  THR      3.5     3.8    -      -       -      +
    374A  HIS*     1.3    77.3    -      -       +      +
    376A  ALA*     1.3    67.5    +      -       -      +
    378A  GLN*     2.9    31.1    +      -       -      +
    379A  GLY      3.3     0.3    +      -       -      -
    380A  VAL*     3.1    39.9    +      -       +      +
    385A  VAL*     3.8    22.4    -      -       +      -
    388A  ARG*     4.1    15.0    -      -       +      +
    389A  LEU*     3.8    33.2    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 376 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    372A  THR      2.8    20.9    +      -       -      +
    373A  LEU*     3.7    13.9    -      -       +      +
    375A  LEU*     1.3    72.8    -      -       -      +
    377A  ASN*     1.3    60.7    +      -       -      +
    379A  GLY*     2.9    20.8    +      -       -      -
    380A  VAL*     3.5    13.0    +      -       -      +
    416A  LEU*     3.9    21.5    -      -       +      +
    420A  LEU*     3.9    23.2    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 377 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    373A  LEU*     2.8    28.2    +      -       -      +
    374A  HIS*     3.6     7.5    -      -       -      +
    375A  LEU      3.2     0.4    -      -       -      -
    376A  ALA*     1.3    79.5    -      -       -      +
    378A  GLN*     1.3    59.3    +      -       +      +
    379A  GLY      3.3     1.1    +      -       -      -
----------------------------------------------------------
 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