Contacts of the helix formed by residues 372 - 397 (chain A) in PDB entry 5XRA


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 372 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    370A  LYS      4.1     2.4    +      -       -      -
    371A  MET*     1.3    75.1    -      -       -      +
    373A  LYS*     1.3    64.5    +      -       -      +
    374A  LEU*     3.7    21.7    -      -       -      +
    375A  ILE*     3.1    31.1    +      -       -      +
    376A  LYS*     3.3    23.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 373 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115A  GLN*     6.2     0.2    -      -       -      -
    372A  ASN*     1.3    75.9    -      -       -      +
    374A  LEU*     1.3    62.5    +      -       -      +
    376A  LYS*     3.5    12.1    +      -       +      +
    377A  THR*     2.9    38.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 374 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    372A  ASN*     3.2    18.8    -      -       -      +
    373A  LYS*     1.3    80.3    -      -       -      +
    375A  ILE*     1.3    64.6    +      -       +      +
    377A  THR*     3.2    11.1    +      -       +      -
    378A  VAL*     2.9    41.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 375 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    362A  ILE*     3.7    23.1    -      -       +      -
    365A  TYR*     4.4    17.7    -      -       +      -
    370A  LYS      4.9     3.4    -      -       -      +
    371A  MET*     3.6    40.6    -      -       +      -
    372A  ASN*     3.1    25.5    +      -       -      +
    374A  LEU*     1.3    80.0    -      -       +      +
    376A  LYS*     1.3    67.3    +      -       -      +
    378A  VAL*     3.1     9.4    +      -       +      +
    379A  PHE*     2.8    22.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 376 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  CYS*     2.8    42.2    +      -       -      +
    108A  PHE*     4.4     8.6    -      -       -      +
    110A  VAL*     5.1     1.9    -      -       -      +
    266A  ASP*     3.3    40.4    +      -       -      +
    267A  ILE*     5.3     7.4    -      -       +      -
    371A  MET*     4.5    17.4    -      -       +      -
    372A  ASN      3.3    16.0    +      -       -      +
    373A  LYS*     3.7    13.2    -      -       -      +
    375A  ILE*     1.3    76.2    -      -       -      +
    377A  THR*     1.3    62.8    +      -       -      +
    379A  PHE*     3.2    10.1    +      -       -      +
    380A  ALA*     3.2    20.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 377 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110A  VAL*     4.7    15.2    -      -       +      +
    115A  GLN*     4.1    28.9    +      -       -      +
    373A  LYS*     2.9    29.9    +      -       -      +
    374A  LEU*     3.3    14.8    -      -       +      -
    376A  LYS*     1.3    72.9    -      -       -      +
    378A  VAL*     1.3    67.4    +      -       +      +
    380A  ALA*     3.2    11.3    +      -       -      +
    381A  PHE*     3.3    30.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 378 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    362A  ILE*     3.9    11.9    -      -       +      -
    374A  LEU*     2.9    33.7    +      -       +      +
    375A  ILE*     3.1    11.2    +      -       +      +
    377A  THR*     1.3    76.1    -      -       +      +
    379A  PHE*     1.3    52.3    +      -       -      +
    381A  PHE*     3.1     9.3    +      -       +      +
    382A  CYS*     2.6    52.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 379 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    267A  ILE*     3.4    27.8    -      -       +      -
    268A  PHE*     3.5    11.7    -      +       -      -
    359A  LEU*     3.7    18.8    -      -       +      -
    362A  ILE*     3.7    32.3    -      -       +      +
    363A  MET*     3.4    45.1    -      -       +      -
    375A  ILE      2.8    12.9    +      -       -      +
    376A  LYS*     3.2    12.3    +      -       -      +
    378A  VAL*     1.3    76.8    -      -       -      +
    380A  ALA*     1.3    54.7    +      -       -      +
    382A  CYS*     4.1     4.7    -      -       +      -
    383A  SER*     2.5    58.0    +      -       -      -
    602A  8D3      3.1    18.2    -      +       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 380 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110A  VAL*     3.6    29.4    -      -       +      -
    119A  ILE*     4.4     7.9    -      -       +      -
    174A  PHE*     3.5    27.5    -      -       +      -
    178A  HIS*     4.1    14.8    -      -       +      +
    376A  LYS      3.2     6.7    +      -       -      +
    377A  THR      3.2     8.7    +      -       -      +
    379A  PHE*     1.3    81.4    -      -       -      +
    381A  PHE*     1.3    62.5    +      -       +      +
    383A  SER*     3.5     8.1    +      -       -      -
    384A  MET*     3.6     7.8    +      -       -      +
    602A  8D3      5.2     0.2    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 381 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110A  VAL*     5.1     0.9    -      -       +      -
    115A  GLN*     4.2    28.9    -      -       +      -
    118A  ALA*     4.3    18.8    -      -       +      -
    119A  ILE*     4.2    25.1    -      -       +      -
    122A  LEU*     5.4     8.5    -      -       +      -
    377A  THR*     3.3    37.8    +      -       +      +
    378A  VAL*     3.1     9.4    +      -       +      +
    380A  ALA*     1.3    77.3    -      -       +      +
    382A  CYS*     1.3    66.6    +      -       -      +
    384A  MET*     3.2    31.5    +      -       +      +
    385A  LEU*     3.8     8.6    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with CYS 382 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    358A  PRO*     4.4    19.1    -      -       +      -
    359A  LEU*     3.7    22.0    -      -       +      +
    362A  ILE*     4.2    11.4    -      -       +      -
    378A  VAL*     2.6    39.8    +      -       -      +
    379A  PHE*     3.6     7.9    -      -       -      +
    381A  PHE*     1.3    69.1    -      -       -      +
    383A  SER*     1.3    61.6    +      -       -      +
    384A  MET      3.1     1.6    -      -       -      -
    385A  LEU*     2.8    39.8    +      -       +      +
    386A  CYS      4.1     0.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 383 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170A  PHE*     3.9    12.9    -      -       -      -
    174A  PHE*     4.0    10.3    -      -       -      -
    359A  LEU*     3.7     9.6    -      -       -      +
    379A  PHE*     2.5    34.6    +      -       -      -
    380A  ALA      3.5     8.1    -      -       -      -
    381A  PHE      3.3     0.2    -      -       -      -
    382A  CYS*     1.3    72.5    -      -       -      +
    384A  MET*     1.3    61.3    +      -       -      +
    385A  LEU      3.2     0.7    +      -       -      -
    386A  CYS*     3.3    19.9    +      -       -      +
    387A  LEU      4.3     0.9    +      -       -      -
    602A  8D3      2.8    45.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 384 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118A  ALA      4.6     0.2    -      -       -      +
    119A  ILE*     3.7    40.4    -      -       +      +
    122A  LEU*     3.9    35.4    -      -       +      +
    123A  SER*     2.9    31.4    -      -       -      +
    126A  LEU*     4.7     6.9    -      -       +      +
    170A  PHE*     4.8     3.8    -      -       -      -
    174A  PHE*     4.2     9.2    -      -       +      -
    380A  ALA      3.6    12.4    +      -       -      +
    381A  PHE*     3.2    24.3    +      -       +      +
    382A  CYS      3.1     0.8    -      -       -      -
    383A  SER*     1.3    77.2    -      -       -      +
    385A  LEU*     1.3    63.7    +      -       +      +
    386A  CYS      3.1     1.1    +      -       -      -
    387A  LEU*     3.2    29.3    +      -       +      +
    388A  LEU*     3.6     5.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 385 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    354A  ILE*     4.2    31.0    -      -       +      +
    355A  CYS*     3.7    29.4    -      -       -      +
    358A  PRO*     6.1     3.1    -      -       +      -
    381A  PHE      3.8    15.0    -      -       -      +
    382A  CYS*     2.8    26.8    +      -       +      +
    384A  MET*     1.3    78.2    -      -       +      +
    386A  CYS*     1.3    61.0    +      -       -      +
    388A  LEU*     3.3    27.7    +      -       +      +
    389A  ASN      3.3    15.1    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with CYS 386 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170A  PHE*     6.0     0.7    -      -       +      -
    200A  PHE*     4.0    23.5    -      -       +      -
    355A  CYS*     5.2     6.5    -      -       -      -
    356A  TRP*     3.8    26.7    -      -       +      -
    359A  LEU*     3.7    32.5    -      -       -      -
    382A  CYS      5.2     0.4    -      -       -      -
    383A  SER      3.3    13.7    +      -       -      +
    384A  MET      3.1     1.2    -      -       -      -
    385A  LEU*     1.3    76.6    -      -       -      +
    387A  LEU*     1.3    65.2    +      -       +      +
    389A  ASN*     3.1    19.1    +      -       -      +
    390A  SER*     3.1    13.7    +      -       -      -
    602A  8D3      4.3    12.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 387 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122A  LEU      4.7     0.2    -      -       -      +
    123A  SER*     3.9    25.1    -      -       -      +
    126A  LEU*     4.3    19.1    -      -       +      -
    127A  GLY*     4.3     3.1    -      -       -      +
    130A  THR*     4.1     1.9    +      -       -      +
    167A  SER*     4.0    24.7    -      -       -      -
    170A  PHE*     4.0    27.1    -      -       +      -
    171A  VAL*     3.7    33.0    -      -       +      -
    200A  PHE*     4.7     7.2    -      -       +      -
    383A  SER      4.3     0.2    +      -       -      -
    384A  MET*     3.2    16.8    +      -       +      +
    386A  CYS*     1.3    77.9    -      -       -      +
    388A  LEU*     1.3    64.2    +      -       -      +
    390A  SER*     2.9    17.8    +      -       -      -
    391A  THR*     2.9    17.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 388 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126A  LEU*     4.2    27.1    -      -       +      +
    354A  ILE*     5.9     3.1    -      -       +      -
    355A  CYS*     4.8     7.6    -      -       -      -
    384A  MET      3.6     4.2    +      -       -      +
    385A  LEU*     3.3    31.8    +      -       +      +
    386A  CYS      3.2     0.2    -      -       -      -
    387A  LEU*     1.3    78.8    -      -       -      +
    389A  ASN*     1.3    64.1    +      -       -      +
    391A  THR*     2.9    17.0    +      -       -      -
    392A  VAL*     3.0    31.4    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 389 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163A  ASP*     5.9     0.2    +      -       -      -
    203A  SER*     4.8     6.1    +      -       -      -
    207A  LEU*     4.7     9.1    -      -       -      +
    351A  VAL*     3.3    25.6    -      -       -      +
    352A  LEU*     4.3     8.4    -      -       -      +
    355A  CYS*     3.9    23.4    -      -       +      -
    356A  TRP*     4.1    23.6    -      -       +      +
    385A  LEU      3.3     3.1    +      -       -      +
    386A  CYS*     3.1    12.9    +      -       -      +
    388A  LEU*     1.3    77.7    -      -       -      +
    390A  SER*     1.3    62.8    +      -       -      +
    392A  VAL*     3.5     5.6    -      -       -      +
    393A  ASN*     3.1    51.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 390 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130A  THR*     3.5    25.6    -      -       -      +
    134A  ASN*     3.9     0.7    +      -       -      -
    163A  ASP*     3.5    37.8    +      -       -      +
    167A  SER*     5.2     2.9    -      -       -      -
    200A  PHE*     3.7    19.1    -      -       -      -
    386A  CYS      3.1    10.1    +      -       -      -
    387A  LEU*     2.9    14.8    +      -       -      -
    389A  ASN*     1.3    77.6    +      -       -      +
    391A  THR*     1.3    56.8    +      -       -      +
    393A  ASN*     4.8     0.2    -      -       -      +
    394A  PRO*     3.1    22.3    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 391 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126A  LEU*     3.9    20.0    +      -       +      +
    129A  PHE*     4.8     9.4    -      -       +      -
    130A  THR*     2.7    23.2    +      -       -      +
    133A  GLU*     3.2    33.6    -      -       -      +
    387A  LEU      2.9     9.9    +      -       -      -
    388A  LEU*     2.9    15.4    +      -       +      -
    390A  SER*     1.3    77.3    -      -       -      +
    392A  VAL*     1.3    62.5    +      -       +      +
    394A  PRO*     3.2    12.6    -      -       -      +
    395A  ILE*     4.1     7.2    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 392 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    351A  VAL*     4.0    24.0    -      -       +      -
    388A  LEU*     3.0    27.8    +      -       +      +
    389A  ASN*     3.5    10.8    -      -       -      +
    391A  THR*     1.3    79.8    -      -       +      +
    393A  ASN*     1.3    63.9    +      -       -      +
    394A  PRO      3.4     0.2    -      -       -      -
    395A  ILE*     2.9    17.6    +      -       +      +
    396A  ILE*     2.8    49.8    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 393 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159A  LEU*     3.8    32.2    -      -       +      +
    163A  ASP*     3.6    21.1    +      -       -      +
    203A  SER*     4.2     3.8    +      -       -      -
    207A  LEU*     4.3     9.2    -      -       -      +
    351A  VAL*     5.2     0.3    -      -       -      +
    389A  ASN*     3.1    46.0    +      -       -      +
    392A  VAL*     1.3    77.5    -      -       -      +
    394A  PRO*     1.3    67.9    -      -       +      +
    396A  ILE*     4.0     9.9    -      -       -      +
    397A  TYR*     3.1    43.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PRO 394 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  GLU*     4.1    21.5    -      -       +      +
    134A  ASN*     3.7    26.9    -      -       -      +
    137A  VAL*     4.3    17.7    -      -       +      -
    163A  ASP*     4.8     0.2    -      -       -      +
    390A  SER      3.1    22.7    -      -       -      +
    391A  THR      3.2    12.1    -      -       -      +
    393A  ASN*     1.3    90.0    -      -       +      +
    395A  ILE*     1.3    56.5    +      -       -      +
    398A  ALA*     3.2    14.5    +      -       +      +
    399A  LEU*     3.0    27.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 395 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  GLU*     3.8    22.2    -      -       -      +
    391A  THR*     4.1    11.0    -      -       +      +
    392A  VAL*     2.9    16.4    +      -       +      +
    394A  PRO*     1.3    74.7    -      -       -      +
    396A  ILE*     1.3    69.2    +      -       +      +
    399A  LEU*     3.4    37.9    -      -       +      +
    400A  ARG*     4.2     1.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 396 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    344A  THR*     5.4     7.7    -      -       -      +
    347A  LEU*     4.6    17.7    -      -       +      -
    348A  ILE*     3.8    26.9    -      -       +      -
    351A  VAL*     4.4    20.0    -      -       +      -
    392A  VAL*     2.8    44.7    +      -       +      +
    393A  ASN*     3.2    11.2    +      -       -      +
    395A  ILE*     1.3    77.8    -      -       +      +
    397A  TYR*     1.3    88.2    +      -       +      +
    400A  ARG*     3.4    19.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 397 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155A  PHE*     3.4    33.9    -      +       +      -
    156A  ILE*     4.4     9.5    -      -       +      +
    159A  LEU*     3.9    13.5    -      -       +      -
    207A  LEU*     3.3    31.1    -      -       +      +
    210A  ALA*     5.9     1.1    -      -       +      -
    294A  TYR*     5.1     8.3    +      -       -      -
    348A  ILE*     3.2    47.7    -      -       +      +
    393A  ASN*     3.1    28.8    +      -       -      +
    396A  ILE*     1.3    92.0    -      -       +      +
    398A  ALA*     1.3    68.1    +      -       -      +
    399A  LEU      3.3     1.1    -      -       -      -
    400A  ARG*     3.0    14.1    +      -       -      +
    401A  SER*     3.3    11.6    +      -       -      -
----------------------------------------------------------
 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