Contacts of the helix formed by residues 83 - 105 (chain B) in PDB entry 2QQ6


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 GLY 83 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79A  GLY*     4.8     0.4    -      -       -      -
     82A  ALA*     2.8    18.4    -      -       -      -
     39B  SER*     5.5     0.2    -      -       -      -
     82B  ALA*     1.3    77.3    -      -       -      +
     84B  ALA*     1.3    67.6    +      -       -      -
     86B  ILE*     3.0    12.3    +      -       -      +
     87B  THR*     3.0    12.1    +      -       -      -
    269B  TYR*     3.3    34.7    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 84 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  ILE*     5.2     3.8    -      -       +      -
     79A  GLY*     4.6     4.4    -      -       -      -
     82A  ALA*     3.8     6.3    -      -       -      +
     84A  ALA*     4.2    19.0    -      -       +      +
     85A  VAL*     4.6    14.1    -      -       +      -
     39B  SER*     4.7    11.2    -      -       -      +
     40B  ALA*     5.9     2.7    -      -       +      -
     45B  ILE*     5.6     6.0    -      -       +      +
     48B  ILE*     4.0    20.1    -      -       +      +
     82B  ALA      3.9     0.8    +      -       -      -
     83B  GLY*     1.3    68.3    -      -       -      -
     85B  VAL*     1.3    56.6    +      -       -      +
     87B  THR*     2.8    29.3    +      -       -      -
     88B  ALA*     2.9    11.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 85 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40A  ALA*     4.6     7.6    -      -       +      -
     84A  ALA*     4.6    12.8    -      -       +      +
     48B  ILE*     4.0    30.2    -      -       +      +
     75B  ASN*     3.8    32.5    -      -       -      +
     78B  THR      3.7    14.1    -      -       -      +
     79B  GLY*     3.5    23.1    -      -       -      +
     80B  GLY*     4.2    10.3    -      -       -      -
     82B  ALA      4.8     0.2    +      -       -      -
     83B  GLY      3.5     0.6    -      -       -      -
     84B  ALA*     1.3    74.5    -      -       -      +
     86B  ILE*     1.3    57.8    +      -       +      +
     88B  ALA*     3.5     2.1    +      -       -      +
     89B  LEU*     3.1    33.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 86 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68B  TYR*     3.8    17.3    -      -       -      +
     72B  ARG*     4.1    13.5    -      -       +      -
     80B  GLY*     3.3    22.0    -      -       -      +
     81B  GLN      4.4     1.1    -      -       -      +
     82B  ALA*     3.5    27.6    -      -       -      -
     83B  GLY      3.0     9.2    +      -       -      +
     85B  VAL*     1.3    76.5    -      -       -      +
     87B  THR*     1.3    62.7    +      -       -      +
     89B  LEU*     3.5     9.2    +      -       +      +
     90B  SER*     2.8    27.2    +      -       -      -
    269B  TYR*     3.7     9.4    -      -       +      -
    270B  THR*     4.2     9.0    -      -       +      -
    292B  LYS      3.3     5.4    -      -       -      +
    293B  CYS      2.7    35.9    -      -       -      +
    294B  GLY*     3.8     3.6    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 87 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36B  CYS*     3.7     6.8    -      -       +      -
     37B  TYR*     3.5    32.1    -      -       +      +
     39B  SER*     4.2    16.6    +      -       -      -
     45B  ILE*     5.2     3.6    -      -       +      -
     83B  GLY      3.0    11.4    +      -       -      -
     84B  ALA      2.8    12.7    +      -       -      -
     86B  ILE*     1.3    71.6    -      -       -      +
     88B  ALA*     1.3    63.1    +      -       -      +
     90B  SER*     3.1    16.2    -      -       -      -
     91B  GLY      3.5     3.3    +      -       -      -
    269B  TYR*     3.8     2.8    +      -       -      -
    291B  ALA      3.1    18.3    -      -       -      +
    292B  LYS*     3.2    29.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 88 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36B  CYS*     3.6    14.0    -      -       -      -
     45B  ILE*     4.1     9.8    -      -       +      +
     48B  ILE*     3.6    29.8    -      -       +      -
     49B  VAL*     3.8    18.3    -      -       +      +
     84B  ALA      2.9     9.7    +      -       -      +
     85B  VAL      3.5     9.0    -      -       -      +
     87B  THR*     1.3    73.4    -      -       -      +
     89B  LEU*     1.3    67.7    +      -       -      +
     90B  SER      3.0     1.1    -      -       -      -
     91B  GLY*     2.8    15.4    +      -       -      -
     92B  ILE*     3.3    10.9    +      -       +      +
----------------------------------------------------------
 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
----------------------------------------------------------
     48B  ILE*     6.0     0.7    -      -       +      -
     52B  MSE      4.0    16.8    -      -       +      -
     68B  TYR*     3.6    31.9    -      -       +      -
     71B  MSE      3.3    41.5    -      -       +      +
     72B  ARG*     3.8    30.3    -      -       +      +
     75B  ASN*     4.5     6.5    -      -       -      +
     85B  VAL*     3.1    22.4    +      -       +      +
     86B  ILE*     3.9    10.5    -      -       +      +
     88B  ALA*     1.3    78.6    -      -       +      +
     90B  SER*     1.3    53.2    +      -       -      +
     92B  ILE*     3.1     8.5    +      -       +      +
     93B  GLU*     2.7    37.5    +      -       -      +
    294B  GLY      4.7     0.9    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 90 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86B  ILE      2.8    21.2    +      -       -      -
     87B  THR      3.1    13.7    -      -       -      -
     88B  ALA      2.9     0.4    +      -       -      -
     89B  LEU*     1.3    75.7    -      -       -      +
     91B  GLY*     1.3    52.5    +      -       -      +
     93B  GLU*     3.4     2.8    +      -       -      +
     94B  THR*     2.7    32.4    +      -       -      -
    290B  VAL      3.6     7.9    -      -       -      +
    291B  ALA*     3.5    22.2    -      -       -      -
    292B  LYS      3.6     6.1    -      -       -      -
    294B  GLY*     2.9    36.4    +      -       -      -
    295B  GLY*     4.0     2.8    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 91 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23B  VAL*     4.3     8.1    -      -       -      -
     34B  GLY*     3.9     5.0    -      -       -      -
     35B  GLU      4.2    16.2    -      -       -      -
     36B  CYS*     3.7    17.4    -      -       -      +
     87B  THR      3.5     2.4    +      -       -      -
     88B  ALA      2.8    10.3    +      -       -      -
     90B  SER*     1.3    76.2    -      -       -      +
     92B  ILE*     1.3    64.4    +      -       -      -
     94B  THR*     3.0    17.8    +      -       -      -
     95B  ALA*     3.1    11.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 92 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9B  VAL*     5.7     2.7    -      -       +      -
     23B  VAL*     4.1    13.1    -      -       +      +
     25B  VAL*     4.7    10.1    -      -       +      -
     49B  VAL*     3.8    36.8    -      -       +      +
     52B  MSE      4.0    26.7    -      -       +      -
     56B  LEU*     4.4    13.5    -      -       +      -
     71B  MSE      4.1    21.5    -      -       +      -
     88B  ALA*     3.3     7.8    +      -       +      +
     89B  LEU*     3.1    16.1    +      -       +      +
     91B  GLY*     1.3    75.0    -      -       -      +
     93B  GLU*     1.3    62.0    +      -       -      +
     95B  ALA*     3.3     2.6    +      -       -      +
     96B  LEU*     3.2    37.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 93 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64B  VAL*     4.1    10.0    -      -       +      +
     65B  GLU*     6.1     0.5    -      -       -      -
     68B  TYR*     4.7    21.6    -      -       +      +
     71B  MSE      5.2     3.3    -      -       +      +
     89B  LEU      2.7    21.1    +      -       -      +
     90B  SER      3.5     6.1    -      -       -      +
     91B  GLY      3.1     0.2    -      -       -      -
     92B  ILE*     1.3    73.2    -      -       -      +
     94B  THR*     1.3    63.1    +      -       -      +
     96B  LEU*     3.2    12.0    +      -       +      +
     97B  TRP*     2.9    46.4    +      -       +      +
    294B  GLY      4.1    10.3    -      -       -      +
    295B  GLY*     3.3     6.6    -      -       -      -
    296B  LEU*     2.8    32.1    +      -       -      +
    297B  ALA*     3.1    32.6    +      -       -      +
    298B  GLU      4.1     1.0    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 94 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33B  LEU      3.9     4.5    -      -       -      +
     34B  GLY*     3.7    18.6    -      -       -      -
     35B  GLU      4.6     6.4    +      -       -      +
     90B  SER      2.7    16.6    +      -       -      -
     91B  GLY*     3.3     8.3    -      -       -      -
     93B  GLU*     1.3    78.7    +      -       -      +
     95B  ALA*     1.3    64.3    +      -       -      +
     97B  TRP*     3.2     4.0    +      -       -      +
     98B  ASP*     2.8    23.4    +      -       -      +
    290B  VAL*     5.3     2.6    +      -       -      +
    291B  ALA*     5.7     2.1    -      -       -      +
    295B  GLY*     5.2     0.2    -      -       -      -
    296B  LEU*     3.6    31.1    -      -       +      +
    322B  VAL*     5.5     2.5    -      -       +      +
    323B  GLY*     5.9     1.3    -      -       -      -
    326B  ALA*     3.8    20.4    -      -       +      -
    375B  LEU*     5.0     6.3    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 95 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23B  VAL*     4.1     8.1    -      -       +      +
     25B  VAL*     3.9    20.6    -      -       +      -
     32B  GLY*     3.5    20.5    -      -       -      +
     33B  LEU      3.7    13.7    -      -       -      +
     34B  GLY*     3.9     7.1    -      -       -      +
     91B  GLY      3.1     8.4    +      -       -      +
     92B  ILE      3.4    10.8    -      -       -      +
     94B  THR*     1.3    77.7    -      -       -      +
     96B  LEU*     1.3    51.3    +      -       -      +
     98B  ASP*     2.7     7.3    +      -       -      +
     99B  LEU*     2.6    34.0    +      -       -      -
----------------------------------------------------------
 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
----------------------------------------------------------
      6B  ILE*     4.3    11.9    -      -       +      -
     25B  VAL*     4.0    26.0    -      -       +      -
     56B  LEU*     3.9    21.5    -      -       +      -
     61B  PRO*     3.8    26.9    -      -       +      +
     64B  VAL*     3.9    15.0    -      -       +      +
     67B  LEU*     4.2    15.9    -      -       +      -
     71B  MSE      4.3    10.3    -      -       +      -
     92B  ILE*     3.3    23.6    -      -       +      +
     93B  GLU*     3.2     8.6    +      -       +      +
     95B  ALA*     1.3    75.0    -      -       -      +
     97B  TRP*     1.3    57.1    +      -       -      +
     99B  LEU*     3.6     5.5    -      -       +      +
    100B  ALA*     2.8    33.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TRP 97 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62B  ARG      5.5     2.0    -      -       -      -
     64B  VAL*     3.1    38.4    -      -       +      +
     65B  GLU*     5.1     7.9    -      -       -      -
     93B  GLU*     2.9    49.0    +      -       -      +
     94B  THR*     3.5     8.7    -      -       -      +
     96B  LEU*     1.3    77.1    -      -       -      +
     98B  ASP*     1.3    59.9    +      -       -      +
    100B  ALA*     4.2     4.0    -      -       +      -
    101B  GLY      3.5    10.7    +      -       -      -
    108B  VAL*     3.0    24.5    -      -       +      +
    111B  LEU*     3.6    45.4    -      -       +      +
    112B  LEU*     3.5    26.2    -      -       +      +
    296B  LEU*     4.1    23.3    -      -       +      -
    297B  ALA*     3.7    18.3    -      -       +      +
    375B  LEU*     5.9     0.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 98 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32B  GLY*     3.3     4.7    -      -       -      -
     33B  LEU*     2.6    34.6    +      -       -      +
     94B  THR      2.8    11.5    +      -       -      +
     95B  ALA      2.7    12.8    +      -       -      +
     97B  TRP*     1.3    77.1    -      -       -      +
     99B  LEU*     1.3    63.4    +      -       -      -
    101B  GLY*     3.0    11.6    +      -       -      -
    102B  LYS*     3.0    23.8    +      -       -      +
    108B  VAL*     4.5     0.7    -      -       -      -
    374B  GLY*     2.8    33.1    -      -       -      +
    375B  LEU*     3.3    23.8    -      -       +      +
    377B  LEU*     6.1     0.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 99 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6B  ILE*     5.3     0.4    -      -       +      -
     25B  VAL*     3.9    30.5    -      -       +      +
     27B  ALA*     4.0    16.8    -      -       +      -
     30B  GLU*     4.2     1.3    -      -       +      -
     31B  HIS*     3.9    27.6    -      -       -      +
     32B  GLY*     3.5    13.4    -      -       -      -
     61B  PRO*     3.5    34.1    -      -       +      -
     95B  ALA      2.6    18.8    +      -       -      +
     96B  LEU*     3.6     6.3    -      -       +      +
     98B  ASP*     1.3    71.3    -      -       -      +
    100B  ALA*     1.3    64.3    +      -       -      +
    102B  LYS*     3.0     7.1    +      -       -      +
    103B  LEU*     2.9    45.4    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 100 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61B  PRO      3.5    17.9    -      -       -      +
     62B  ARG*     4.2    11.4    -      -       -      +
     64B  VAL*     5.6     1.1    -      -       +      -
     96B  LEU      2.8    22.2    +      -       -      +
     97B  TRP*     4.2    10.8    -      -       +      +
     99B  LEU*     1.3    74.5    -      -       -      +
    101B  GLY*     1.3    56.1    +      -       -      +
    103B  LEU*     3.2     8.8    +      -       -      +
    104B  GLN*     2.8    46.1    +      -       -      +
    111B  LEU*     4.3     9.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 101 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97B  TRP      3.5     6.3    +      -       -      -
     98B  ASP      3.0     7.9    +      -       -      -
    100B  ALA*     1.3    78.6    -      -       -      +
    102B  LYS*     1.3    54.2    +      -       -      +
    104B  GLN*     4.6     1.1    -      -       -      -
    105B  GLY*     2.7    28.1    +      -       -      -
    106B  VAL      2.9    26.7    +      -       -      -
    108B  VAL*     5.3     0.4    -      -       -      -
    111B  LEU*     3.7    14.3    -      -       -      +
    373B  PRO*     3.4     1.4    -      -       -      +
    374B  GLY*     3.7    11.7    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 102 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30B  GLU*     2.9    32.9    +      -       -      +
     31B  HIS*     2.7    53.9    +      -       -      +
     98B  ASP*     3.0    34.2    +      -       -      +
     99B  LEU*     3.0     7.9    +      -       -      +
    101B  GLY*     1.3    76.7    -      -       -      +
    103B  LEU*     1.3    65.3    +      -       -      +
    105B  GLY*     3.4     8.3    +      -       -      -
    373B  PRO*     4.2    15.5    -      -       +      +
    374B  GLY*     4.3     7.6    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 103 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4B  PRO*     3.7    36.3    -      -       +      -
     27B  ALA*     4.8     2.5    -      -       +      -
     30B  GLU*     3.9    26.5    -      -       +      +
     61B  PRO*     4.0    19.7    -      -       +      -
     62B  ARG*     4.7     7.6    -      -       +      -
     99B  LEU*     2.9    40.1    +      -       +      +
    100B  ALA*     3.6     7.2    -      -       -      +
    102B  LYS*     1.3    75.9    -      -       -      +
    104B  GLN*     1.3    66.3    +      -       -      +
    105B  GLY*     2.9     5.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 104 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62B  ARG*     3.0    49.0    -      -       -      +
    100B  ALA*     2.8    31.6    +      -       -      +
    101B  GLY*     4.4     2.0    -      -       -      +
    103B  LEU*     1.3    74.1    -      -       -      +
    105B  GLY*     1.3    63.7    +      -       -      +
    106B  VAL*     3.5    17.6    -      -       +      +
    111B  LEU*     4.8    17.6    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 105 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101B  GLY      2.7    13.5    +      -       -      -
    102B  LYS      3.7     7.2    -      -       -      -
    103B  LEU      2.9     4.0    -      -       -      -
    104B  GLN*     1.3    76.2    -      -       -      +
    106B  VAL*     1.3    66.6    +      -       -      +
    373B  PRO*     3.5    19.4    -      -       -      +
----------------------------------------------------------
 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