Contacts of the helix formed by residues 74 - 101 (chain B) in PDB entry 4KJQ


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 74 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71B  THR      4.5     0.9    +      -       -      +
     73B  ASP*     1.3    84.0    +      -       -      +
     75B  TYR*     1.3    53.4    +      -       -      +
     76B  PRO*     3.2    20.6    -      -       -      +
     77B  LEU*     2.9    37.5    +      -       +      +
     78B  LEU*     2.7    37.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 75 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73B  ASP      3.2     9.3    +      -       -      +
     74B  ASN*     1.3    69.9    -      -       -      +
     76B  PRO*     1.4    72.1    -      -       +      +
     78B  LEU*     3.3    18.2    -      -       +      +
     79B  LEU*     2.9    71.7    +      -       +      +
    307B  PHE*     4.1    13.5    -      +       -      -
    308B  VAL*     4.1    12.1    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PRO 76 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74B  ASN*     3.2    12.8    -      -       -      +
     75B  TYR*     1.4    99.0    -      -       +      +
     77B  LEU*     1.3    57.0    +      -       -      +
     79B  LEU*     4.1    12.1    -      -       +      +
     80B  THR*     2.9    24.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 77 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71B  THR*     3.9    28.9    -      -       +      +
     73B  ASP*     5.2     2.2    -      -       -      +
     74B  ASN*     2.9    40.1    +      -       +      +
     76B  PRO*     1.3    75.2    -      -       -      +
     78B  LEU*     1.3    61.2    +      -       -      +
     80B  THR*     3.1    11.5    +      -       +      -
     81B  VAL*     3.1    43.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 78 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68B  LEU*     3.6    39.7    -      -       +      +
     71B  THR*     3.2    31.4    -      -       -      +
     72B  ALA*     5.1     4.9    -      -       -      -
     74B  ASN      2.7    14.4    +      -       -      +
     75B  TYR*     3.3    36.3    -      -       +      +
     77B  LEU*     1.3    70.0    -      -       -      +
     79B  LEU*     1.3    71.5    +      -       +      +
     80B  THR      3.1     1.3    -      -       -      -
     81B  VAL*     4.4     1.8    -      -       -      -
     82B  ALA*     3.2    21.0    +      -       +      +
    307B  PHE*     3.4    42.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 79 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75B  TYR*     2.9    68.6    +      -       +      +
     76B  PRO*     4.1    10.1    -      -       +      +
     78B  LEU*     1.3    83.0    -      -       +      +
     80B  THR*     1.3    60.8    +      -       -      +
     82B  ALA*     3.8     3.1    -      -       -      +
     83B  PHE*     3.3    13.5    +      -       -      +
    304B  LEU*     3.2    32.6    -      -       +      +
    307B  PHE*     4.0     5.2    -      -       +      -
    308B  VAL*     4.0    20.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 80 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76B  PRO      2.9    17.9    +      -       -      -
     77B  LEU*     3.1    15.6    +      -       +      +
     78B  LEU      3.1     0.6    -      -       -      -
     79B  LEU*     1.3    75.7    -      -       -      +
     81B  VAL*     1.3    58.1    +      -       +      +
     82B  ALA      3.1     1.6    -      -       -      -
     83B  PHE*     2.9     9.8    +      -       +      +
     84B  LEU*     2.7    57.8    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 81 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67B  ALA*     4.0    23.6    -      -       +      +
     68B  LEU*     3.5    21.7    -      -       +      +
     71B  THR*     4.1    15.9    -      -       +      +
     77B  LEU*     3.1    32.4    +      -       +      +
     78B  LEU      3.8     3.6    -      -       -      +
     80B  THR*     1.3    76.6    -      -       +      +
     82B  ALA*     1.3    59.4    +      -       -      +
     84B  LEU*     3.9     9.9    -      -       +      +
     85B  CYS*     3.0    38.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 82 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64B  ARG*     5.1     3.3    +      -       -      +
     68B  LEU*     3.8    23.1    -      -       +      -
     78B  LEU*     3.2    17.6    +      -       +      +
     79B  LEU*     3.8     7.6    -      -       -      +
     80B  THR      3.1     0.4    -      -       -      -
     81B  VAL*     1.3    78.1    -      -       -      +
     83B  PHE*     1.3    66.1    -      -       -      +
     85B  CYS*     4.1     2.8    -      -       -      +
     86B  SER*     3.4    22.5    +      -       -      -
    303B  GLY*     3.4    26.7    -      -       -      +
    304B  LEU*     4.4     3.4    -      -       +      -
    307B  PHE*     4.9     4.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 83 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79B  LEU      3.3    11.4    +      -       -      +
     80B  THR*     2.9    11.8    +      -       +      +
     82B  ALA*     1.3    80.6    -      -       -      +
     84B  LEU*     1.3    64.3    +      -       +      +
     87B  ALA*     2.7    54.4    +      -       +      +
    296B  GLY      3.9    11.7    -      -       -      -
    297B  ALA*     4.1    15.5    -      -       +      -
    300B  GLY*     3.2    35.9    -      -       -      +
    301B  LEU*     4.0     7.4    -      -       +      -
    304B  LEU*     4.4    14.6    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 84 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80B  THR*     2.7    41.9    +      -       +      +
     81B  VAL*     4.3     7.4    -      -       +      +
     83B  PHE*     1.3    86.5    -      -       +      +
     85B  CYS*     1.3    60.5    +      -       -      +
     87B  ALA*     3.9     5.4    -      -       +      -
     88B  VAL*     2.8    44.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with CYS 85 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64B  ARG*     3.9    25.4    -      -       +      -
     67B  ALA*     4.4    22.4    -      -       -      -
     68B  LEU*     6.3     0.2    -      -       -      -
     81B  VAL*     3.0    29.3    +      -       -      +
     82B  ALA*     4.1     3.6    -      -       -      +
     84B  LEU*     1.3    76.0    -      -       -      +
     86B  SER*     1.3    58.4    +      -       -      +
     88B  VAL*     4.3     5.1    -      -       -      +
     89B  LEU*     3.3    33.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 86 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64B  ARG*     3.2     7.1    +      -       -      -
     82B  ALA      3.4     9.7    +      -       -      -
     83B  PHE      3.3     1.9    +      -       -      -
     84B  LEU      3.1     0.4    -      -       -      -
     85B  CYS*     1.3    77.5    -      -       -      +
     87B  ALA*     1.3    54.2    +      -       -      +
     88B  VAL      3.2     0.2    -      -       -      -
     89B  LEU*     3.0     2.9    +      -       -      +
     90B  ALA*     2.6    36.4    +      -       -      +
    141B  GLY*     2.4    35.4    +      -       -      -
    299B  GLY*     3.0    26.9    -      -       -      -
    303B  GLY*     3.1    15.4    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 87 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83B  PHE*     2.7    37.4    +      -       +      +
     84B  LEU*     3.5    11.0    -      -       +      +
     86B  SER*     1.3    70.9    -      -       -      +
     88B  VAL*     1.3    57.7    +      -       +      +
     91B  MET*     2.9    40.5    +      -       +      +
    296B  GLY*     3.1    32.9    -      -       -      +
    300B  GLY      3.6     2.8    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 88 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84B  LEU*     2.8    32.0    +      -       +      +
     85B  CYS*     4.3     4.7    -      -       -      +
     87B  ALA*     1.3    72.3    -      -       +      +
     89B  LEU*     1.3    64.4    +      -       +      +
     91B  MET*     3.2    21.2    +      -       +      +
     92B  PHE*     2.9    30.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 89 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60B  LEU*     4.4    29.6    -      -       +      -
     64B  ARG*     4.3    10.3    -      -       +      -
     85B  CYS*     3.3    21.0    +      -       +      +
     86B  SER      3.0     4.1    +      -       -      +
     88B  VAL*     1.3    82.8    -      -       +      +
     90B  ALA*     1.3    63.0    +      -       -      +
     92B  PHE*     3.4    13.6    +      -       +      +
     93B  GLY      3.1    15.8    +      -       -      -
    137B  GLY*     3.5    36.0    -      -       -      +
    140B  GLY      4.1     9.6    -      -       -      +
    141B  GLY*     4.1    17.9    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 90 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86B  SER      2.6    21.0    +      -       -      +
     87B  ALA      3.6     4.3    -      -       -      +
     89B  LEU*     1.3    72.8    -      -       -      +
     91B  MET*     1.3    56.9    +      -       -      +
     93B  GLY*     2.9    16.8    +      -       -      -
     94B  TYR*     3.0    24.0    +      -       +      -
    137B  GLY      4.2     2.8    +      -       -      -
    138B  THR*     4.4    10.2    -      -       -      +
    141B  GLY*     6.3     0.4    -      -       -      -
    143B  MET*     4.2     9.0    -      -       +      -
    295B  GLY      3.4    24.5    -      -       -      +
    299B  GLY*     3.6    16.4    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 91 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87B  ALA*     2.9    30.0    +      -       +      +
     88B  VAL*     3.5    23.3    -      -       +      +
     90B  ALA*     1.3    75.4    -      -       -      +
     92B  PHE*     1.3    56.7    +      -       -      +
     94B  TYR*     3.5     1.1    +      -       -      +
     95B  PHE*     2.8    33.2    +      -       -      +
    292B  VAL*     3.0    41.5    -      -       +      +
    293B  LEU*     4.2    22.9    -      -       -      +
    296B  GLY*     3.4    13.2    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 92 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88B  VAL*     2.9    19.4    +      -       +      +
     89B  LEU*     3.6    16.8    -      -       +      +
     90B  ALA      3.3     0.2    -      -       -      -
     91B  MET*     1.3    76.7    -      -       -      +
     93B  GLY*     1.3    56.9    +      -       -      +
     95B  PHE*     3.7     7.8    -      +       -      +
     96B  LEU*     3.2    55.4    +      -       +      +
    133B  PHE*     3.6    42.0    -      +       +      -
    136B  LEU*     6.0     0.2    -      -       +      -
    137B  GLY*     4.9     5.2    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 93 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89B  LEU      3.1     9.2    +      -       -      -
     90B  ALA      2.9    10.0    +      -       -      -
     92B  PHE*     1.3    76.4    -      -       -      +
     94B  TYR*     1.3    64.0    +      -       -      -
     95B  PHE      3.0     1.8    +      -       -      -
     96B  LEU*     3.4    10.2    +      -       -      +
     97B  VAL*     3.4    18.9    +      -       -      +
    133B  PHE      5.0     0.2    -      -       -      -
    134B  GLY*     3.8    27.0    -      -       -      -
    138B  THR*     4.6     3.1    -      -       -      -
    353B  PRO*     4.5     6.5    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 94 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90B  ALA      3.0    29.3    +      -       -      +
     91B  MET      4.0     2.9    -      -       -      +
     93B  GLY*     1.3    73.8    -      -       -      +
     95B  PHE*     1.3    62.3    +      -       -      +
     97B  VAL*     3.4     5.8    +      -       -      +
     98B  ARG*     3.0    28.9    +      -       +      +
    138B  THR*     4.3     6.5    -      -       +      -
    143B  MET*     3.5    18.0    -      -       +      +
    291B  TRP*     3.5    26.9    -      +       +      -
    292B  VAL*     3.9    17.7    -      -       +      +
    294B  MET*     5.0     1.1    -      -       +      -
    295B  GLY*     3.3    37.0    -      -       -      -
    298B  ILE*     4.1     4.0    -      -       -      +
    350B  SER*     2.3    50.1    +      -       -      -
    351B  GLY      4.8     1.3    -      -       -      -
    352B  ALA*     3.3    28.3    -      -       +      +
    353B  PRO*     4.6     3.8    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 95 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91B  MET      2.8    20.7    +      -       -      +
     92B  PHE*     3.7     8.7    -      +       -      +
     93B  GLY      3.0     0.2    -      -       -      -
     94B  TYR*     1.3    74.1    -      -       -      +
     96B  LEU*     1.3    82.4    +      -       +      +
     97B  VAL      2.9     5.5    +      -       -      -
     98B  ARG*     3.8     1.5    -      -       -      +
     99B  LYS*     3.0    41.3    +      -       +      +
    100B  TYR*     4.3    20.6    -      +       -      -
    288B  ILE*     4.3    17.7    -      -       +      -
    292B  VAL*     3.5    24.2    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 96 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92B  PHE*     3.2    59.2    +      -       +      +
     93B  GLY      3.4     4.9    +      -       -      +
     95B  PHE*     1.3    92.5    -      -       +      +
     97B  VAL*     1.3    59.4    +      -       -      +
     99B  LYS      4.2     0.4    -      -       -      -
    100B  TYR*     3.4    38.6    +      -       +      +
    129B  PRO*     5.5     1.8    -      -       +      +
    130B  VAL*     3.3    47.8    -      -       +      +
    133B  PHE*     5.1     7.2    -      -       +      -
    134B  GLY*     4.7     2.9    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 97 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93B  GLY      3.4    14.3    +      -       -      +
     94B  TYR*     3.6     8.1    -      -       -      +
     95B  PHE      2.9     2.0    +      -       -      -
     96B  LEU*     1.3    75.4    -      -       -      +
     98B  ARG*     1.3    73.6    +      -       +      +
     99B  LYS      3.1     1.6    -      -       -      -
    101B  ALA      3.0    46.3    +      -       -      +
    102B  PRO*     3.2     8.8    -      -       +      +
    104B  ALA      3.6    16.2    -      -       -      +
    105B  GLY*     3.5    25.1    -      -       -      +
    130B  VAL*     3.8    15.7    -      -       +      +
    351B  GLY      4.9     2.2    -      -       -      +
    353B  PRO*     3.8    19.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 98 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94B  TYR*     3.0    20.1    +      -       -      +
     95B  PHE      4.0     0.7    -      -       -      +
     97B  VAL*     1.3    86.1    -      -       +      +
     99B  LYS*     1.3    59.6    +      -       -      +
    102B  PRO*     3.1    51.2    +      -       -      +
    105B  GLY*     6.0     0.8    -      -       -      -
    286B  GLY*     4.6     7.4    +      -       -      -
    288B  ILE*     3.4    31.4    -      -       +      +
    291B  TRP*     3.0    69.0    -      -       +      +
    292B  VAL*     5.0     1.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 99 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95B  PHE*     3.0    31.9    +      -       +      +
     98B  ARG*     1.3    80.3    -      -       -      +
    100B  TYR*     1.3    96.9    +      -       +      +
    102B  PRO*     5.6     0.9    -      -       -      -
    126B  ARG*     4.7     2.3    +      -       -      -
    288B  ILE*     4.0    19.7    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 100 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95B  PHE*     4.3    13.5    -      +       -      -
     96B  LEU*     3.4    36.4    +      -       +      +
     99B  LYS*     1.3   113.3    -      -       +      +
    101B  ALA*     1.3    63.5    +      -       -      +
    102B  PRO*     4.0     3.8    -      -       -      -
    123B  ARG*     3.8     2.6    +      -       -      -
    126B  ARG*     2.4    47.8    +      -       +      +
    130B  VAL*     3.8    12.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 101 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96B  LEU      3.8     2.0    +      -       -      -
     97B  VAL*     3.0    21.5    +      -       -      +
    100B  TYR*     1.3    81.9    -      -       -      +
    102B  PRO*     1.3    67.9    -      -       -      +
    103B  GLU*     3.2     5.2    -      -       -      +
    104B  ALA*     3.2    18.1    +      -       +      +
    123B  ARG*     4.6     2.9    -      -       -      +
    126B  ARG*     3.9    17.3    -      -       +      +
    127B  VAL*     4.4     7.9    -      -       +      -
    130B  VAL*     3.7    26.0    -      -       +      -
----------------------------------------------------------
 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