Contacts of the helix formed by residues 55 - 80 (chain A) in PDB entry 5AZS


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 55 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  ALA      2.7    22.4    +      -       -      +
     52A  LEU      4.8     0.9    -      -       -      +
     53A  ASP      4.0     0.2    -      -       -      -
     54A  ASN*     1.3    70.5    -      -       -      +
     56A  ARG*     1.3    63.5    +      -       -      +
     57A  SER*     3.9    13.5    +      -       -      -
     58A  LEU*     3.6    23.3    +      -       +      +
     59A  ARG*     3.1    24.1    +      -       -      +
    152A  LEU*     3.6    32.4    -      -       +      +
    231A  LEU*     4.5     4.9    -      -       -      +
    232A  LEU*     3.5    35.0    -      -       -      +
    233A  LEU      3.7     3.2    +      -       -      -
    234A  GLY*     4.9     1.6    -      -       -      -
    359C  GLN*     5.5     1.0    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 56 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  ASN*     3.5    16.7    +      -       -      +
     55A  ASN*     1.3    74.8    +      -       -      +
     57A  SER*     1.3    60.2    +      -       -      +
     59A  ARG*     3.2    43.9    +      -       -      +
     60A  GLN*     3.0    34.1    +      -       -      +
    234A  GLY      4.1    12.5    +      -       -      -
     13C  PRO*     4.3    12.6    -      -       -      +
    351C  VAL*     5.9     0.6    -      -       -      +
    352C  ALA*     3.7    22.4    -      -       -      +
    355C  GLU*     3.4    38.0    +      -       -      +
    356C  GLY*     3.9    17.0    -      -       -      +
    359C  GLN*     3.2    30.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 57 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55A  ASN*     3.4    14.7    +      -       -      -
     56A  ARG*     1.3    75.3    -      -       -      +
     58A  LEU*     1.3    62.5    +      -       -      +
     60A  GLN*     3.5    15.4    +      -       -      +
     61A  THR*     3.1    25.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 58 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  ALA      5.2     0.2    -      -       -      +
     52A  LEU*     3.9    21.3    -      -       +      +
     55A  ASN*     3.6    21.5    -      -       -      +
     56A  ARG      3.4     0.2    -      -       -      -
     57A  SER*     1.3    76.8    -      -       -      +
     59A  ARG*     1.3    60.7    +      -       -      +
     61A  THR*     3.2     5.9    +      -       -      -
     62A  LEU*     2.8    43.6    +      -       +      +
    145A  ALA      3.9     8.1    -      -       -      +
    148A  ALA*     3.6    29.8    -      -       +      -
    149A  ARG*     3.7    33.2    -      -       +      +
    152A  LEU*     3.6    25.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 59 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53A  ASP      3.9    19.8    +      -       -      -
     54A  ASN*     4.2    13.3    +      -       -      +
     55A  ASN      3.1    15.1    +      -       -      +
     56A  ARG*     3.2    49.0    -      -       -      +
     57A  SER      3.3     0.6    -      -       -      -
     58A  LEU*     1.3    76.9    -      -       -      +
     60A  GLN*     1.3    56.1    +      -       -      +
     62A  LEU*     3.3    13.1    +      -       +      +
     63A  LEU*     3.0    45.5    +      -       +      +
    352C  ALA*     4.0    19.7    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 60 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56A  ARG*     3.0    21.1    +      -       -      +
     57A  SER*     3.6    15.2    -      -       -      +
     58A  LEU      3.3     0.4    -      -       -      -
     59A  ARG*     1.3    76.2    -      -       -      +
     61A  THR*     1.3    50.8    +      -       -      +
     63A  LEU*     3.2     8.0    +      -       -      +
     64A  ASP*     2.8    41.2    +      -       -      +
    349C  SER*     3.8    23.9    +      -       -      +
    352C  ALA*     4.1     7.9    +      -       +      -
    353C  ALA*     3.4    32.6    -      -       -      +
    356C  GLY*     5.6     2.4    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 61 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57A  SER*     3.1    13.4    +      -       -      -
     58A  LEU*     3.2    12.6    +      -       -      -
     60A  GLN*     1.3    74.9    -      -       -      +
     62A  LEU*     1.3    64.5    +      -       -      +
     64A  ASP*     3.4    26.0    +      -       +      +
     65A  ILE*     3.6    12.8    +      -       -      +
    141A  SER      5.0     0.9    -      -       -      +
    144A  ALA*     4.1    13.2    -      -       +      +
    145A  ALA*     3.8    29.2    -      -       -      +
    148A  ALA*     4.3    12.1    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 62 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52A  LEU      5.8     2.7    -      -       -      +
     58A  LEU*     2.8    35.2    +      -       +      +
     59A  ARG*     3.5    15.5    -      -       +      +
     60A  GLN      3.3     0.4    -      -       -      -
     61A  THR*     1.3    76.6    -      -       -      +
     63A  LEU*     1.3    61.9    +      -       +      +
     65A  ILE*     2.9    32.4    -      -       +      +
     66A  GLU*     3.7    10.1    +      -       -      +
    145A  ALA*     4.1    21.1    -      -       +      +
    149A  ARG*     5.6    13.9    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 63 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59A  ARG*     3.0    31.8    +      -       +      +
     60A  GLN      3.2     1.5    +      -       -      +
     62A  LEU*     1.3    78.8    -      -       +      +
     64A  ASP*     1.3    63.5    +      -       -      +
     65A  ILE      3.3     0.7    -      -       -      -
     66A  GLU*     3.3    21.1    +      -       +      +
     67A  ALA*     3.1    21.7    +      -       -      +
    345C  ALA*     4.2    10.9    -      -       -      +
    348C  ASP*     3.3    52.7    -      -       +      +
    349C  SER*     3.2    21.4    +      -       -      +
    352C  ALA*     4.9     1.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 64 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60A  GLN*     2.8    25.7    +      -       -      +
     61A  THR*     3.4    23.4    +      -       +      +
     62A  LEU      3.3     0.2    -      -       -      -
     63A  LEU*     1.3    77.4    -      -       -      +
     65A  ILE*     1.3    58.6    +      -       +      +
     67A  ALA*     3.4     7.9    +      -       -      +
     68A  ALA*     3.0    27.1    +      -       -      +
    141A  SER*     4.5     5.9    +      -       -      -
    349C  SER*     4.4     7.4    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 65 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61A  THR      3.6    11.7    -      -       -      +
     62A  LEU*     2.9    29.8    +      -       +      +
     64A  ASP*     1.3    74.7    -      -       +      +
     66A  GLU*     1.3    75.5    -      -       -      +
     68A  ALA*     3.7     0.8    -      -       -      -
     69A  ARG*     2.9    37.3    +      -       -      +
    138A  TYR*     3.7     7.4    -      -       +      +
    141A  SER*     3.2    46.2    -      -       -      +
    142A  GLU*     3.6    32.8    -      -       +      +
    145A  ALA*     4.1     7.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 66 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62A  LEU*     3.7    11.7    +      -       -      +
     63A  LEU*     3.3    25.9    +      -       +      +
     64A  ASP      3.3     0.4    -      -       -      -
     65A  ILE*     1.3    94.7    -      -       -      +
     67A  ALA*     1.3    64.1    +      -       -      +
     69A  ARG*     3.6    30.2    +      -       -      +
     70A  ALA*     3.1    21.8    +      -       -      +
     73A  ARG*     5.9     0.9    +      -       -      -
    341C  SER*     5.1     1.0    -      -       -      +
    345C  ALA*     4.0    16.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 67 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63A  LEU      3.1    13.1    +      -       -      +
     64A  ASP*     3.5    10.5    -      -       -      +
     66A  GLU*     1.3    75.3    -      -       -      +
     68A  ALA*     1.3    58.1    +      -       -      +
     70A  ALA*     3.0     9.3    +      -       -      +
     71A  GLN*     3.0    35.6    +      -       +      +
    342C  LEU*     4.4    16.6    -      -       +      +
    345C  ALA*     4.0    13.3    -      -       +      +
    346C  ARG*     5.1     7.6    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 68 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64A  ASP      3.0    14.7    +      -       -      +
     65A  ILE      3.8     4.7    -      -       -      +
     66A  GLU      3.4     0.2    -      -       -      -
     67A  ALA*     1.3    75.2    -      -       -      +
     69A  ARG*     1.3    59.5    +      -       -      +
     71A  GLN*     3.5    12.4    +      -       -      +
     72A  TYR*     3.4    15.6    +      -       -      +
    134A  ALA      4.1     2.8    -      -       -      +
    137A  GLN*     4.2     7.5    +      -       +      +
    138A  TYR*     3.7    25.8    -      -       -      +
    141A  SER*     3.2    28.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 69 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65A  ILE*     2.9    26.7    +      -       -      +
     66A  GLU*     3.7    34.2    +      -       -      +
     67A  ALA      3.2     0.2    -      -       -      -
     68A  ALA*     1.3    74.8    -      -       -      +
     70A  ALA*     1.3    59.4    +      -       -      +
     72A  TYR*     3.3    10.1    +      -       +      +
     73A  ARG*     3.0    65.1    +      -       +      +
    138A  TYR*     3.5    41.1    +      -       +      -
    142A  GLU*     5.0     2.4    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 70 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  GLU      3.1    10.8    +      -       -      +
     67A  ALA      3.0     9.9    +      -       -      +
     69A  ARG*     1.3    79.2    -      -       -      +
     71A  GLN*     1.3    57.8    +      -       -      +
     73A  ARG*     3.5    14.8    +      -       -      +
     74A  ILE*     2.9    33.3    +      -       -      +
    338C  ALA*     3.6    21.7    -      -       -      +
    341C  SER*     4.4     7.4    -      -       -      -
    342C  LEU*     3.7    21.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 71 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67A  ALA*     3.0    23.2    +      -       -      +
     68A  ALA*     3.7    11.1    -      -       -      +
     69A  ARG      3.2     0.4    -      -       -      -
     70A  ALA*     1.3    73.8    -      -       -      +
     72A  TYR*     1.3    60.7    +      -       -      +
     74A  ILE*     3.3    12.8    +      -       -      +
     75A  GLN*     2.9    28.9    +      -       -      +
    134A  ALA*     4.2     4.2    -      -       +      +
    137A  GLN*     3.9    23.3    -      -       -      +
    342C  LEU*     3.9    20.6    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 72 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  ALA      3.4     6.0    +      -       -      +
     69A  ARG*     3.3    15.6    +      -       +      +
     71A  GLN*     1.3    77.6    -      -       -      +
     73A  ARG*     1.3    59.2    +      -       +      +
     75A  GLN*     3.2     0.9    +      -       -      -
     76A  ARG*     2.7    71.1    +      -       -      +
    131A  THR*     3.4    39.6    -      -       +      +
    132A  ASP*     5.4     0.4    -      -       -      -
    134A  ALA*     3.7    21.4    -      -       -      +
    135A  LEU*     3.5    44.1    -      -       +      +
    138A  TYR*     4.8     5.4    -      +       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 73 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  GLU      5.9     0.6    +      -       -      -
     69A  ARG*     3.0    59.8    +      -       +      +
     70A  ALA*     3.6    10.6    -      -       -      +
     71A  GLN      3.3     0.2    -      -       -      -
     72A  TYR*     1.3    79.5    -      -       +      +
     74A  ILE*     1.3    60.4    +      -       -      +
     76A  ARG*     4.0    28.2    +      -       -      +
     77A  ALA*     3.3    21.5    +      -       -      +
    333C  GLY      4.7     1.7    -      -       -      +
    334C  GLY      4.4     4.7    -      -       -      +
    338C  ALA*     3.6    22.8    -      -       +      +
    341C  SER*     3.9    25.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 74 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70A  ALA      2.9    18.5    +      -       -      +
     71A  GLN*     3.4    14.1    -      -       -      +
     72A  TYR      3.2     0.4    -      -       -      -
     73A  ARG*     1.3    76.9    -      -       -      +
     75A  GLN*     1.3    63.8    +      -       +      +
     77A  ALA*     3.5    17.4    -      -       -      +
     78A  ASP*     4.0     9.0    +      -       -      +
    335C  ARG*     4.2    18.0    -      -       +      +
    338C  ALA*     3.7    14.6    -      -       +      -
    339C  ASN*     3.4    35.9    -      -       -      +
    342C  LEU*     3.8    22.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 75 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  GLN      2.9    15.1    +      -       -      +
     72A  TYR      3.2     3.3    +      -       -      +
     74A  ILE*     1.3    78.0    -      -       +      +
     76A  ARG*     1.3    64.2    +      -       -      +
     78A  ASP*     3.2    26.1    +      -       -      +
     79A  ARG      4.0     0.5    +      -       -      -
    127A  VAL*     4.1     8.5    -      -       -      +
    130A  LEU*     3.3    51.4    -      -       -      +
    131A  THR*     3.3    29.0    +      -       -      -
    134A  ALA*     4.1    11.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 76 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72A  TYR*     2.7    52.2    +      -       +      +
     73A  ARG*     4.0    25.9    +      -       -      +
     75A  GLN*     1.3    73.1    -      -       -      +
     77A  ALA*     1.3    63.0    +      -       -      +
     79A  ARG*     3.1    25.5    +      -       +      +
     80A  VAL*     4.0     4.9    +      -       -      +
    131A  THR*     3.7    18.9    -      -       +      +
    333C  GLY      4.8     0.9    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 77 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  ARG      3.3    10.4    +      -       -      +
     74A  ILE      3.5    13.2    -      -       -      +
     75A  GLN      3.2     0.2    -      -       -      -
     76A  ARG*     1.3    78.5    -      -       -      +
     78A  ASP*     1.3    56.2    +      -       -      +
     80A  VAL*     3.1    28.3    -      -       -      +
    333C  GLY*     3.2    40.7    +      -       -      +
    335C  ARG*     3.7    25.1    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 78 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74A  ILE      4.2     7.4    -      -       -      +
     75A  GLN*     3.2    24.9    +      -       -      +
     76A  ARG      3.2     1.2    -      -       -      -
     77A  ALA*     1.3    76.0    -      -       -      +
     79A  ARG*     1.3    63.4    +      -       -      +
     80A  VAL      3.4     6.9    +      -       -      +
    119A  TYR*     4.2     9.4    -      -       -      -
    120A  GLU*     5.5     3.3    +      -       -      +
    126A  ARG*     6.0     0.2    +      -       -      -
    127A  VAL*     3.7    23.9    -      -       +      +
    335C  ARG*     3.5    28.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 79 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76A  ARG*     3.1    16.0    +      -       +      +
     78A  ASP*     1.3    76.7    -      -       -      +
     80A  VAL*     1.3    56.3    +      -       -      +
     81A  PRO*     4.2     0.2    -      -       -      +
    119A  TYR*     3.2    22.6    +      -       -      -
    122A  ASP*     4.3     9.2    +      -       -      +
    127A  VAL*     3.8    13.9    -      -       +      +
    128A  LYS*     3.6    47.1    -      -       -      +
    131A  THR*     3.7    36.3    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 80 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76A  ARG      4.0     2.0    +      -       -      +
     77A  ALA*     3.1    30.4    -      -       -      +
     78A  ASP*     3.5     6.9    -      -       -      +
     79A  ARG*     1.3    77.0    -      -       -      +
     81A  PRO*     1.4    80.9    -      -       +      +
     82A  GLY      4.0     0.9    +      -       -      -
    119A  TYR*     3.7     3.6    -      -       -      -
    332C  ASP      4.5     3.6    -      -       -      +
    333C  GLY*     3.4    26.4    -      -       -      +
----------------------------------------------------------
 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