Contacts of the helix formed by residues 361 - 385 (chain A) in PDB entry 4C48


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 361 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    356A  TYR*     3.9     8.7    +      -       -      +
    359A  LEU*     2.9    14.2    +      -       -      +
    360A  GLN*     1.3    98.1    +      -       -      +
    362A  PHE*     1.3    77.2    +      -       +      +
    363A  ARG*     3.1     6.0    +      -       +      +
    364A  ALA*     3.1    23.5    +      -       +      +
    365A  THR*     3.2    15.8    +      -       -      +
    417A  GLU*     5.7     1.0    -      -       -      +
    498A  LYS*     5.5     6.9    -      -       +      +
    500A  ILE*     5.6     5.5    -      -       -      +
    509A  LYS*     4.6    12.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 362 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    352A  PHE*     5.2     2.6    -      -       +      -
    356A  TYR*     3.5    23.6    -      -       +      -
    361A  ASN*     1.3    80.2    -      -       +      +
    363A  ARG*     1.3    91.0    +      -       +      +
    365A  THR*     2.7    21.6    +      -       -      -
    366A  LEU*     3.2    20.4    -      -       +      +
    498A  LYS*     6.5     1.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 363 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    361A  ASN*     3.1     5.0    +      -       +      +
    362A  PHE*     1.3    97.9    -      -       +      +
    364A  ALA*     1.3    68.0    +      -       -      +
    366A  LEU*     3.2    24.8    +      -       +      +
    367A  ILE*     3.5     8.6    -      -       -      +
    495A  THR      3.4    10.1    +      -       -      -
    496A  MET*     2.5    57.8    +      -       +      +
    497A  LEU*     4.5     2.6    +      -       -      -
    498A  LYS*     4.1    34.2    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 364 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    359A  LEU*     3.9    34.9    -      -       +      +
    361A  ASN*     3.1    19.0    +      -       +      +
    363A  ARG*     1.3    78.5    -      -       -      +
    365A  THR*     1.3    62.2    +      -       -      +
    367A  ILE*     3.1    28.8    +      -       -      +
    368A  PRO*     3.2     9.9    -      -       -      +
    413A  VAL*     5.5     0.9    -      -       -      +
    417A  GLU*     5.9     1.8    -      -       -      +
    497A  LEU*     4.5    15.0    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 365 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    352A  PHE*     3.2    26.0    -      -       -      +
    355A  MET*     3.5    15.2    -      -       +      +
    356A  TYR*     3.3    44.8    -      -       +      +
    359A  LEU*     5.2     0.9    -      -       +      -
    361A  ASN      3.2    12.5    +      -       -      +
    362A  PHE*     2.7    26.7    +      -       -      -
    364A  ALA*     1.3    72.2    -      -       +      +
    366A  LEU*     1.3    60.3    +      -       -      +
    367A  ILE      3.3     0.4    -      -       -      -
    368A  PRO*     3.5    10.3    -      -       -      +
    369A  THR*     2.8    26.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 366 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    352A  PHE*     5.0     7.2    -      -       +      -
    362A  PHE*     3.2    27.1    +      -       +      +
    363A  ARG*     3.2    13.4    +      -       +      +
    365A  THR*     1.3    82.1    +      -       -      +
    367A  ILE*     1.3    62.0    +      -       -      +
    369A  THR*     2.4    21.0    +      -       -      +
    370A  ILE*     3.0    33.9    +      -       +      +
    496A  MET*     4.4     9.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 367 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    363A  ARG      3.5    15.0    -      -       -      +
    364A  ALA*     3.1    25.7    +      -       -      +
    366A  LEU*     1.3    78.7    -      -       -      +
    368A  PRO*     1.3    68.9    -      -       +      +
    369A  THR      3.3     0.2    +      -       -      -
    370A  ILE*     3.4     3.3    +      -       -      +
    371A  ALA*     3.4    18.2    +      -       -      +
    413A  VAL*     3.9    25.4    -      -       +      -
    489A  THR*     4.4    10.8    -      -       -      +
    492A  LEU*     3.9    32.3    -      -       +      +
    493A  CYS*     4.4     3.8    -      -       -      +
    496A  MET*     3.7    33.4    -      -       +      -
    497A  LEU*     4.0    24.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PRO 368 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    351A  VAL*     5.5     4.3    -      -       +      -
    355A  MET*     3.6    28.9    -      -       +      -
    359A  LEU*     5.3     0.4    -      -       +      -
    364A  ALA      3.2    14.8    -      -       -      +
    365A  THR*     3.5     7.6    -      -       -      +
    367A  ILE*     1.3    94.0    -      -       +      +
    369A  THR*     1.3    64.6    +      -       -      +
    371A  ALA*     3.4    13.6    +      -       +      +
    372A  VAL*     3.5    18.9    +      -       -      +
    406A  VAL      5.3     0.2    -      -       -      +
    409A  ALA*     4.6    10.8    -      -       +      +
    410A  ILE*     3.7    22.7    -      -       +      -
    413A  VAL*     4.0    20.4    -      -       +      -
    489A  THR*     5.6     0.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 369 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    348A  ILE*     4.6    17.8    -      -       +      +
    351A  VAL*     4.8     7.4    -      -       +      -
    352A  PHE*     3.3    39.7    -      -       +      +
    355A  MET*     5.5     0.9    -      -       +      -
    365A  THR      2.8    17.3    +      -       -      +
    366A  LEU*     2.4    32.1    +      -       -      +
    368A  PRO*     1.3    76.3    -      -       +      +
    370A  ILE*     1.3    60.0    +      -       -      +
    371A  ALA      3.3     0.5    +      -       -      -
    372A  VAL*     3.3     7.0    +      -       -      +
    373A  PRO*     2.8    26.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 370 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13A  TRP*     5.1    20.4    -      -       +      -
     20A  MET*     6.6     0.4    -      -       -      -
    366A  LEU*     3.0    42.6    +      -       +      +
    367A  ILE*     3.9     4.0    -      -       -      +
    369A  THR*     1.3    78.1    +      -       -      +
    371A  ALA*     1.3    62.4    +      -       -      +
    373A  PRO*     3.1    20.5    -      -       +      +
    374A  VAL*     3.4    16.5    -      -       +      +
    488A  LEU*     4.9     3.8    -      -       +      -
    492A  LEU*     4.5    13.5    -      -       +      -
    496A  MET*     3.9    21.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 371 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    367A  ILE      3.4     9.8    +      -       -      +
    368A  PRO      3.8     8.7    -      -       -      +
    369A  THR      3.2     1.0    -      -       -      -
    370A  ILE*     1.3    81.3    -      -       -      +
    372A  VAL*     1.3    62.6    +      -       -      +
    374A  VAL*     3.7     3.6    +      -       -      +
    375A  VAL*     3.3    26.0    +      -       +      +
    405A  LEU*     5.5     0.2    -      -       -      -
    409A  ALA*     4.3    11.9    -      -       +      -
    484A  VAL*     4.5     6.6    -      -       +      +
    485A  ALA*     6.0     0.7    -      -       -      -
    488A  LEU*     4.3    19.3    -      -       +      -
    489A  THR*     3.8    22.9    -      -       -      +
    492A  LEU*     5.0     0.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 372 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    348A  ILE*     3.8    21.3    -      -       +      -
    351A  VAL*     5.6     5.6    -      -       +      -
    368A  PRO      3.5    11.4    +      -       -      +
    369A  THR*     3.3     6.8    +      -       -      +
    371A  ALA*     1.3    75.7    -      -       +      +
    373A  PRO*     1.4    77.1    -      -       +      +
    375A  VAL*     3.0     5.5    +      -       -      +
    376A  LEU*     3.0    38.4    +      -       +      +
    402A  ILE*     5.2     6.1    -      -       +      -
    405A  LEU*     3.6    27.3    -      -       +      +
    406A  VAL*     3.7    28.3    -      -       +      +
    409A  ALA*     5.8     2.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PRO 373 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20A  MET*     5.8     5.8    -      -       +      -
    348A  ILE*     4.5     9.9    -      -       +      -
    369A  THR      2.8    27.1    -      -       -      +
    370A  ILE*     3.1    17.9    -      -       +      +
    372A  VAL*     1.4    83.3    -      -       +      +
    374A  VAL*     1.3    61.8    +      -       +      +
    376A  LEU*     3.0    27.9    +      -       +      +
    377A  LEU*     3.0    30.1    +      -       +      +
   2044A  LMT      6.2     3.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 374 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16A  ALA*     4.0    37.2    -      -       +      +
     19A  ILE*     3.6    10.4    -      -       +      +
     20A  MET*     4.4    17.9    -      -       +      +
    370A  ILE*     3.4    23.1    -      -       +      +
    371A  ALA      3.7     8.1    -      -       -      +
    372A  VAL      3.1     0.6    +      -       -      -
    373A  PRO*     1.3    76.2    -      -       +      +
    375A  VAL*     1.3    63.8    +      -       -      +
    377A  LEU*     3.9     7.1    -      -       -      +
    378A  GLY*     3.2    18.5    +      -       -      -
    480A  LEU*     5.0     0.3    -      -       -      +
    484A  VAL*     4.3    22.1    -      -       +      +
    488A  LEU*     4.1    16.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 375 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    371A  ALA*     3.3    11.9    +      -       +      +
    372A  VAL      3.0     6.6    +      -       -      +
    374A  VAL*     1.3    77.7    -      -       -      +
    376A  LEU*     1.3    59.8    +      -       -      +
    378A  GLY      3.0     2.6    +      -       -      -
    379A  THR*     3.0    28.3    +      -       -      +
    405A  LEU*     3.3    38.1    -      -       +      +
    477A  ALA      3.3    24.2    -      -       -      +
    480A  LEU*     3.1    14.7    -      -       +      +
    481A  SER*     3.6    13.5    -      -       -      +
    484A  VAL*     3.3    29.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 376 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    344A  LEU*     3.9    40.6    -      -       +      -
    348A  ILE*     4.4     2.5    -      -       +      -
    372A  VAL*     3.0    36.5    +      -       +      +
    373A  PRO*     3.0    17.0    +      -       +      +
    375A  VAL*     1.3    79.9    -      -       -      +
    377A  LEU*     1.3    83.3    +      -       +      +
    379A  THR*     3.2    23.1    +      -       -      -
    380A  PHE*     3.8    15.3    +      -       +      -
    398A  MET*     4.4    14.3    -      -       +      +
    402A  ILE*     4.3    15.0    -      -       +      -
    405A  LEU*     4.8     6.1    -      -       +      -
   2044A  LMT      4.9    15.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 377 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19A  ILE      3.1    30.1    -      -       -      +
     20A  MET*     3.3    40.2    -      -       +      +
     23A  GLY*     3.2    24.2    -      -       -      -
     24A  GLY*     4.7     3.1    -      -       -      +
    373A  PRO*     3.0    30.9    +      -       +      +
    374A  VAL      3.9     6.7    -      -       -      +
    376A  LEU*     1.3    79.7    -      -       +      +
    378A  GLY*     1.3    77.3    +      -       -      +
    379A  THR      3.0     2.5    -      -       -      -
    380A  PHE*     2.8    32.3    +      -       +      +
   2044A  LMT      5.2    13.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 378 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19A  ILE*     3.5    31.8    -      -       -      +
    374A  VAL      3.2     1.9    +      -       -      -
    375A  VAL      3.0     9.9    +      -       -      -
    377A  LEU*     1.3    84.4    -      -       -      +
    379A  THR*     1.3    60.1    +      -       -      +
    381A  ALA*     3.2    20.7    -      -       -      +
    382A  VAL*     3.4     5.9    +      -       -      +
    480A  LEU*     3.6    15.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 379 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    375A  VAL      3.0    14.4    +      -       -      -
    376A  LEU*     3.2    14.7    +      -       -      -
    377A  LEU      3.0     0.4    -      -       -      -
    378A  GLY*     1.3    74.1    -      -       -      +
    380A  PHE*     1.3    65.9    +      -       -      +
    382A  VAL*     3.2     1.0    +      -       -      +
    383A  LEU*     3.1    39.1    +      -       +      +
    398A  MET*     5.5     8.4    -      -       +      +
    473A  THR*     3.8     8.3    -      -       +      +
    476A  SER*     3.1    28.3    -      -       -      +
    477A  ALA*     3.5    31.2    -      -       +      +
    480A  LEU*     3.7     8.4    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 380 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  GLY      3.8    13.5    -      -       -      +
     26A  ALA*     3.6     8.2    -      -       +      +
     27A  ILE*     3.6    29.6    -      -       +      -
     30A  LEU*     4.7     5.8    -      -       +      +
    376A  LEU*     4.1     9.0    -      -       +      -
    377A  LEU*     2.8    41.4    +      -       +      +
    379A  THR*     1.3    72.3    -      -       -      +
    381A  ALA*     1.3    63.5    +      -       -      +
    383A  LEU*     3.8    10.2    -      -       +      +
    384A  ALA*     2.9    27.9    +      -       -      +
    390A  ILE*     3.8    28.3    -      -       +      -
    395A  MET*     4.1    12.8    -      -       +      -
    398A  MET*     3.5    39.5    -      -       +      -
   2044A  LMT      4.8    13.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 381 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19A  ILE*     5.1     1.3    -      -       +      +
     22A  ALA*     3.9    33.7    -      -       +      -
     23A  GLY*     3.9     3.4    -      -       -      +
     26A  ALA*     3.6    11.8    -      -       -      +
    377A  LEU      3.4     1.4    +      -       -      -
    378A  GLY*     3.2    14.7    +      -       -      +
    379A  THR      3.1     0.6    -      -       -      -
    380A  PHE*     1.3    82.4    -      -       -      +
    382A  VAL*     1.3    63.2    +      -       +      +
    384A  ALA*     3.4     3.8    -      -       -      +
    385A  ALA*     3.2    19.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 382 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    378A  GLY      3.4     3.8    +      -       -      +
    379A  THR      3.2     4.8    +      -       -      +
    381A  ALA*     1.3    79.6    -      -       +      +
    383A  LEU*     1.3    58.0    +      -       -      +
    385A  ALA*     3.1    20.8    +      -       +      +
    386A  PHE*     3.2    34.6    +      -       +      -
    476A  SER*     4.1    19.1    -      -       -      -
    480A  LEU*     3.6    29.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 383 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30A  LEU*     4.0    11.9    -      -       +      -
    379A  THR*     3.1    41.0    +      -       +      +
    380A  PHE*     3.8    14.8    -      -       +      +
    382A  VAL*     1.3    74.2    -      -       -      +
    384A  ALA*     1.3    63.2    +      -       -      +
    385A  ALA      3.3     0.2    -      -       -      -
    386A  PHE*     3.6     9.3    +      -       -      +
    387A  GLY      3.5     2.1    +      -       -      -
    388A  PHE*     3.0    56.6    +      -       +      +
    389A  SER      3.8    16.4    -      -       -      +
    390A  ILE*     5.2     1.6    -      -       -      -
    394A  THR*     5.1     5.8    -      -       +      -
    398A  MET*     4.8     7.4    -      -       +      -
    472A  ILE*     4.6    13.7    -      -       +      -
    473A  THR*     4.3    17.0    -      -       +      +
    476A  SER*     4.9     3.8    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 384 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26A  ALA*     4.1    14.4    -      -       +      +
     30A  LEU*     3.6    31.5    -      -       +      +
    380A  PHE      2.9    21.2    +      -       -      +
    381A  ALA      3.4     5.6    -      -       -      +
    383A  LEU*     1.3    76.4    -      -       -      +
    385A  ALA*     1.3    58.1    +      -       -      +
    386A  PHE      3.2     0.2    -      -       -      -
    387A  GLY*     3.0    20.4    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 385 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    381A  ALA      3.2     9.5    +      -       -      +
    382A  VAL*     3.1    15.9    +      -       +      +
    384A  ALA*     1.3    78.8    -      -       -      +
    386A  PHE*     1.3    63.5    +      -       +      +
    387A  GLY      3.5     0.4    -      -       -      -
----------------------------------------------------------
 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