Contacts of the helix formed by residues 87 - 114 (chain D) in PDB entry 4QYL


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 THR 87 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83D  ASN*     3.5    10.5    -      -       +      +
     84D  ALA*     2.7    40.8    +      -       +      +
     86D  ASP*     1.3    87.0    -      -       -      +
     88D  ILE*     1.3    64.6    +      -       -      +
     89D  PHE*     3.6    12.1    +      -       +      -
     90D  TYR*     3.2    14.7    +      -       -      +
     91D  ARG*     3.1    24.1    +      -       -      +
      4H  GLY*     6.4     1.6    -      -       -      -
      5H  ALY      6.2     0.2    -      -       -      +
      8H  GLY*     3.4    15.7    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 88 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27D  ILE*     4.8     9.6    -      -       +      +
     86D  ASP      3.9     0.4    +      -       -      -
     87D  THR*     1.3    71.9    -      -       -      +
     89D  PHE*     1.3    78.8    +      -       +      +
     91D  ARG*     3.3     8.8    +      -       -      +
     92D  ALA*     2.8    30.7    +      -       -      +
      7H  GLY      3.2    23.3    -      -       -      +
      8H  GLY*     2.8    27.3    +      -       -      +
      9H  LYS      3.9    15.7    -      -       -      +
     10H  ALA*     4.0    12.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 89 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27D  ILE*     3.9    31.9    -      -       +      -
     28D  PHE*     4.2     0.2    -      -       -      -
     79D  CYS*     3.2    16.7    -      -       -      -
     83D  ASN*     3.8    24.7    -      -       -      +
     87D  THR*     3.1     7.1    -      -       +      +
     88D  ILE*     1.3    87.1    -      -       +      +
     90D  TYR*     1.3    65.2    +      -       -      +
     92D  ALA*     3.3     6.4    +      -       -      +
     93D  ALA      3.0    17.7    +      -       -      -
      5H  ALY      3.7    43.1    -      -       +      -
      6H  GLN      3.6    14.8    -      -       -      -
      7H  GLY*     3.9    10.8    -      -       -      -
      8H  GLY*     3.4    26.7    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 90 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79D  CYS*     4.2     5.6    -      -       -      -
     80D  LEU*     3.5    43.6    -      -       +      +
     83D  ASN*     3.4    22.1    -      -       +      +
     84D  ALA      3.1    19.3    -      -       -      +
     85D  LYS*     3.5    35.7    -      -       +      +
     87D  THR*     3.2     9.0    +      -       -      +
     89D  PHE*     1.3    75.2    -      -       -      +
     91D  ARG*     1.3    65.8    +      -       +      +
     93D  ALA*     3.1     5.2    +      -       -      +
     94D  VAL*     3.1    39.7    +      -       +      +
     97D  ARG*     6.0     0.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 91 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85D  LYS      4.1    12.1    -      -       -      +
     86D  ASP*     4.3    10.7    +      -       -      +
     87D  THR      3.1    19.0    +      -       -      +
     88D  ILE*     3.8     8.5    -      -       -      +
     90D  TYR*     1.3    80.5    -      -       +      +
     92D  ALA*     1.3    61.6    +      -       -      +
     94D  VAL*     3.4     7.6    +      -       -      +
     95D  ARG*     3.2    32.0    +      -       -      +
    201D  SO4      2.9    46.3    +      -       -      +
     10H  ALA*     3.8    24.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 92 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23D  ASP*     5.8     0.2    -      -       -      +
     27D  ILE*     3.5    28.3    -      -       +      -
     28D  PHE*     4.1    13.8    -      -       +      -
     88D  ILE      2.8    17.7    +      -       -      +
     89D  PHE      3.5     5.4    -      -       -      +
     91D  ARG*     1.3    76.9    -      -       -      +
     93D  ALA*     1.3    56.4    +      -       -      +
     95D  ARG*     3.3    12.6    +      -       -      +
     96D  LEU*     2.9    28.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 93 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28D  PHE*     3.8    10.5    -      -       +      -
     76D  VAL*     3.9    12.7    -      -       -      +
     79D  CYS*     3.7    24.0    -      -       +      -
     80D  LEU*     3.7    20.4    -      -       +      -
     89D  PHE      3.0    13.4    +      -       -      +
     90D  TYR      3.1     8.0    +      -       -      +
     92D  ALA*     1.3    74.5    -      -       -      +
     94D  VAL*     1.3    59.6    +      -       -      +
     96D  LEU*     3.4     4.1    +      -       -      +
     97D  ARG*     2.8    30.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 94 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80D  LEU*     3.8     8.5    -      -       +      -
     90D  TYR*     3.1    37.8    +      -       +      +
     91D  ARG*     3.6    10.3    -      -       -      +
     92D  ALA      3.4     0.2    -      -       -      -
     93D  ALA*     1.3    75.5    -      -       -      +
     95D  ARG*     1.3    62.3    +      -       +      +
     97D  ARG*     3.3    30.1    +      -       -      +
     98D  GLU*     3.0    37.3    +      -       -      +
    201D  SO4      5.9     2.9    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 95 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22D  LYS      5.9     1.1    -      -       -      +
     24D  THR*     5.5     4.9    +      -       -      -
     91D  ARG*     3.2    19.0    +      -       -      +
     92D  ALA*     3.3    11.9    +      -       -      +
     94D  VAL*     1.3    74.1    -      -       +      +
     96D  LEU*     1.3    65.2    +      -       -      +
     98D  GLU*     3.4    15.4    +      -       -      +
     99D  GLN*     3.0    48.7    +      -       -      +
    201D  SO4      2.5    46.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 96 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19D  LEU      3.9    11.2    -      -       -      +
     22D  LYS*     3.8    28.2    +      -       +      +
     23D  ASP*     4.2    11.0    -      -       +      +
     28D  PHE*     3.6    32.5    -      -       +      -
     50D  PHE*     4.2    11.0    -      -       +      -
     72D  PHE*     3.6    28.7    -      -       +      -
     75D  ILE*     4.2     6.3    -      -       +      -
     76D  VAL*     4.1    11.0    -      -       +      -
     92D  ALA      2.9    17.4    +      -       -      +
     93D  ALA*     3.6     5.4    -      -       -      +
     95D  ARG*     1.3    73.3    -      -       -      +
     97D  ARG*     1.3    62.0    +      -       -      +
     99D  GLN*     5.0     2.2    -      -       -      +
    100D  GLY*     2.8    30.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 97 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72D  PHE*     4.6     6.8    -      -       +      -
     76D  VAL*     3.7    25.7    -      -       +      +
     80D  LEU*     3.4    25.7    -      -       -      +
     90D  TYR*     6.0     0.4    +      -       -      -
     93D  ALA      2.8    18.4    +      -       -      +
     94D  VAL*     3.5    28.5    +      -       -      +
     96D  LEU*     1.3    76.4    -      -       -      +
     98D  GLU*     1.3    64.0    +      -       -      +
    101D  GLY*     3.1    21.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 98 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94D  VAL*     3.0    29.0    +      -       -      +
     95D  ARG*     3.6    24.0    +      -       -      +
     97D  ARG*     1.3    82.0    -      -       -      +
     99D  GLN*     1.3    69.3    +      -       +      +
    101D  GLY*     3.6     6.2    +      -       -      -
    102D  ALA*     4.0     7.8    +      -       -      +
    201D  SO4      5.2     2.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 99 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22D  LYS*     3.5    55.5    +      -       +      +
     24D  THR*     5.9     1.2    -      -       -      +
     95D  ARG*     3.0    43.1    +      -       -      +
     98D  GLU*     1.3    81.2    +      -       +      +
    100D  GLY*     1.3    65.6    +      -       -      +
    102D  ALA*     3.3    15.3    +      -       -      +
    103D  VAL*     3.6    14.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 100 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19D  LEU*     3.7    22.0    -      -       -      -
     22D  LYS*     4.6     4.1    -      -       -      +
     72D  PHE*     3.9     6.3    -      -       -      -
     96D  LEU*     2.8    23.3    +      -       -      -
     99D  GLN*     1.3    70.6    -      -       -      +
    101D  GLY*     1.3    65.4    +      -       -      +
    103D  VAL*     3.1     6.1    +      -       -      +
    104D  LEU*     2.9    32.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 101 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72D  PHE*     4.9     0.8    -      -       -      -
     97D  ARG      3.1    17.0    +      -       -      -
     98D  GLU*     3.6     4.0    +      -       -      -
     99D  GLN      3.2     0.6    -      -       -      -
    100D  GLY*     1.3    77.9    -      -       -      +
    102D  ALA*     1.3    59.8    +      -       -      +
    104D  LEU*     3.4     9.1    +      -       -      +
    105D  ARG*     3.0    33.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 102 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98D  GLU      4.0     5.5    +      -       -      +
     99D  GLN*     3.3    11.9    +      -       -      +
    100D  GLY      3.2     0.6    -      -       -      -
    101D  GLY*     1.3    75.3    -      -       -      +
    103D  VAL*     1.3    64.1    +      -       +      +
    105D  ARG*     3.4     9.4    +      -       -      +
    106D  GLN*     3.2    23.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 103 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15D  THR*     4.0     8.5    -      -       +      +
     18D  GLN*     3.7    44.7    -      -       +      +
     19D  LEU*     3.7    22.2    -      -       +      -
     22D  LYS*     3.8    22.0    -      -       +      -
     99D  GLN      3.7    13.0    -      -       -      +
    100D  GLY*     3.1    10.2    +      -       -      +
    102D  ALA*     1.3    78.2    -      -       +      +
    104D  LEU*     1.3    60.6    -      -       -      +
    106D  GLN*     3.5     5.8    +      -       -      +
    107D  ALA*     3.1    22.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 104 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15D  THR*     4.5     2.5    -      -       +      -
     19D  LEU*     4.2    12.3    -      -       +      -
     65D  PHE*     3.9    25.2    -      -       +      -
     68D  PHE*     4.2    19.3    -      -       +      -
     69D  GLU*     4.0    37.7    -      -       +      +
     72D  PHE*     3.4    34.5    -      -       +      -
     73D  ASN*     4.7     2.5    -      -       -      +
    100D  GLY      2.9    20.4    +      -       -      +
    101D  GLY*     3.8     6.7    -      -       -      +
    103D  VAL*     1.3    73.3    -      -       -      +
    105D  ARG*     1.3    59.5    +      -       +      +
    107D  ALA*     4.5     2.5    -      -       -      -
    108D  ARG*     2.9    33.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 105 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101D  GLY      3.0    25.7    +      -       -      +
    102D  ALA*     3.7     8.1    -      -       -      +
    103D  VAL      3.3     0.2    -      -       -      -
    104D  LEU*     1.3    77.4    -      -       +      +
    106D  GLN*     1.3    62.2    +      -       -      +
    108D  ARG*     3.6     4.4    +      -       -      +
    109D  ARG*     3.3    29.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 106 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11D  LEU*     5.6     1.2    -      -       -      +
     18D  GLN*     4.7    11.4    +      -       -      +
    102D  ALA      3.2    13.8    +      -       -      +
    103D  VAL*     3.7     6.1    -      -       -      +
    105D  ARG*     1.3    79.6    -      -       -      +
    107D  ALA*     1.3    69.9    +      -       -      +
    109D  ARG*     3.3    28.1    +      -       -      +
    110D  GLN*     3.1    50.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 107 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11D  LEU*     3.8     9.1    -      -       +      +
     15D  THR*     3.3    37.0    -      -       +      +
     18D  GLN*     5.1     2.0    -      -       -      +
     65D  PHE*     3.7    12.3    -      -       +      -
    103D  VAL      3.1    17.7    +      -       -      +
    106D  GLN*     1.3    82.4    +      -       -      +
    108D  ARG*     1.3    68.1    +      -       -      +
    110D  GLN*     3.1     8.0    +      -       -      +
    111D  ALA*     2.9    21.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 108 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65D  PHE*     3.6    35.1    -      -       +      +
     66D  ASP*     2.8    36.1    +      -       -      +
     69D  GLU*     2.8    30.5    +      -       -      +
    104D  LEU      2.9    19.7    +      -       -      +
    105D  ARG*     4.0     5.2    -      -       -      +
    107D  ALA*     1.3    76.9    -      -       -      +
    109D  ARG*     1.3    58.0    +      -       +      +
    111D  ALA*     3.0     3.7    +      -       -      +
    112D  GLU*     2.9    49.8    +      -       +      +
    117D  ASP*     4.9    12.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 109 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105D  ARG*     3.3    15.7    +      -       -      +
    106D  GLN*     3.3    31.3    +      -       -      +
    107D  ALA      3.2     0.4    -      -       -      -
    108D  ARG*     1.3    79.4    -      -       +      +
    110D  GLN*     1.3    77.8    +      -       -      +
    112D  GLU*     3.3    17.9    +      -       -      +
    113D  LYS*     3.0    36.8    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 110 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11D  LEU*     4.2    13.5    -      -       +      -
    106D  GLN*     3.1    47.8    +      -       -      +
    107D  ALA*     3.1     7.5    +      -       -      +
    109D  ARG*     1.3    96.1    -      -       -      +
    111D  ALA*     1.3    65.8    +      -       -      +
    113D  LYS*     3.3    29.2    +      -       -      +
    114D  MET*     3.1    48.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 111 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8D  PHE*     5.1     2.7    -      -       +      -
     11D  LEU*     3.6    22.4    -      -       +      +
     65D  PHE*     4.1    15.0    -      -       +      -
    107D  ALA      2.9     9.9    +      -       -      +
    108D  ARG*     3.4     8.3    -      -       -      +
    110D  GLN*     1.3    75.8    -      -       -      +
    112D  GLU*     1.3    62.4    +      -       -      +
    114D  MET*     3.4     5.6    +      -       -      +
    115D  GLY      3.2    12.8    +      -       -      -
    116D  ILE      3.4     5.2    +      -       -      +
    117D  ASP*     3.1    37.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 112 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108D  ARG*     2.9    36.0    +      -       +      +
    109D  ARG*     3.6    23.7    +      -       -      +
    110D  GLN      3.1     0.2    -      -       -      -
    111D  ALA*     1.3    78.5    -      -       -      +
    113D  LYS*     1.3    62.1    +      -       +      +
    115D  GLY*     3.2    12.3    +      -       -      -
    117D  ASP*     3.5    33.1    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 113 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109D  ARG*     3.0    29.2    +      -       +      +
    110D  GLN*     3.3    32.5    +      -       -      +
    112D  GLU*     1.3    76.9    -      -       +      +
    114D  MET*     1.3    63.8    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 114 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7D  PRO*     5.0    23.8    -      -       +      +
     11D  LEU*     5.2    11.7    -      -       +      -
    110D  GLN*     3.1    44.4    +      -       +      +
    111D  ALA*     3.4     5.4    +      -       -      +
    112D  GLU      3.2     0.2    -      -       -      -
    113D  LYS*     1.3    83.0    -      -       +      +
    115D  GLY*     1.3    58.1    +      -       -      +
    116D  ILE*     3.5     3.9    +      -       -      +
----------------------------------------------------------
 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