Contacts of the helix formed by residues 38 - 64 (chain 8) in PDB entry 1Y69


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 ARG 38 (chain 8).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     328  GLY      5.7     0.2    -      -       -      -
     338  GLY*     3.6    23.2    -      -       -      +
     358  GLU      6.1     0.6    -      -       -      +
     368  GLU*     2.8    24.7    +      -       -      +
     378  ARG*     1.3    71.0    -      -       -      +
     398  LYS*     1.3    61.7    +      -       -      +
     408  ASP*     3.0     1.8    +      -       -      -
     418  LEU*     3.5    10.5    +      -       -      +
     428  THR*     3.1    21.7    +      -       -      -
    1108  LEU*     3.6    22.3    -      -       -      +
    1118  MET*     3.7    46.4    +      -       +      +
    1138  PHE*     5.7     3.4    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 39 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     368  GLU      3.9     4.5    +      -       -      +
     388  ARG*     1.3    76.3    -      -       -      +
     408  ASP*     1.3    68.4    +      -       -      +
     418  LEU      3.1     2.5    -      -       -      -
     428  THR*     3.0    27.7    +      -       -      +
     438  LYS*     3.5    27.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 40 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     368  GLU      2.9    24.9    -      -       -      +
     378  ARG*     3.1    23.5    -      -       -      +
     388  ARG      3.0     4.6    +      -       -      -
     398  LYS*     1.3    79.5    -      -       -      +
     418  LEU*     1.3    66.2    +      -       -      +
     438  LYS*     3.0    33.4    -      -       -      +
     448  ILE*     4.0     6.4    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 41 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     278  ILE*     4.5    24.2    -      -       +      +
     288  ARG*     5.7     0.9    -      -       -      -
     298  THR*     5.1     8.1    -      -       -      +
     328  GLY*     5.6    10.3    -      -       -      -
     378  ARG      5.2     2.7    -      -       -      +
     388  ARG*     3.5    14.1    +      -       -      +
     398  LYS      3.1     0.4    -      -       -      -
     408  ASP*     1.3    82.8    -      -       -      +
     428  THR*     1.3    67.0    +      -       -      +
     438  LYS      3.0     2.2    -      -       -      -
     448  ILE*     2.9    31.2    +      -       +      +
     458  VAL*     3.7     6.0    +      -       +      -
    1108  LEU*     3.3    40.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 42 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     388  ARG      3.1    14.6    +      -       -      -
     398  LYS*     3.0    18.3    +      -       -      -
     418  LEU*     1.3    79.1    -      -       -      +
     438  LYS*     1.3    57.7    +      -       -      +
     458  VAL*     2.8    33.5    +      -       +      +
     468  ARG*     2.9    39.7    +      -       +      +
    1078  GLU*     3.6    27.1    +      -       -      +
    1108  LEU*     5.2     3.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 43 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   19300    C      4.9     2.8    +      -       -      +
   19310    G      4.0    18.4    +      -       -      -
     398  LYS*     3.8    27.1    -      -       +      +
     408  ASP*     3.0    27.8    -      -       -      +
     418  LEU      3.0     0.2    -      -       -      -
     428  THR*     1.3    77.4    -      -       -      +
     448  ILE*     1.3    68.4    +      -       +      +
     468  ARG*     3.3    24.7    +      -       +      +
     478  GLY*     3.5     5.0    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 44 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     278  ILE*     3.2    34.8    -      -       +      -
     408  ASP      4.0     5.8    -      -       -      +
     418  LEU*     3.0    23.3    -      -       +      +
     438  LYS*     1.3    88.8    -      -       +      +
     458  VAL*     1.3    61.0    +      -       -      +
     478  GLY*     3.3    10.5    +      -       -      -
     488  GLU*     3.6    14.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 45 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     278  ILE*     4.6     5.8    -      -       +      -
     418  LEU*     3.9    13.0    -      -       +      +
     428  THR*     2.8    19.2    +      -       +      +
     448  ILE*     1.3    76.4    -      -       -      +
     468  ARG*     1.3    65.4    +      -       -      +
     488  GLU*     3.0    14.0    +      -       -      +
     498  ALA*     3.2    12.6    +      -       -      +
    1038  LEU*     4.0    22.4    -      -       +      +
    1068  LYS*     2.8    41.5    -      -       +      +
    1078  GLU*     6.1     0.2    -      -       -      +
    1108  LEU*     3.5    28.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 46 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   19290    U      5.4     1.9    -      -       -      +
   19300    C      3.4    29.7    +      -       -      +
     428  THR*     2.9    38.7    +      -       +      +
     438  LYS*     3.4    15.3    -      -       +      +
     448  ILE      3.3     0.2    -      -       -      -
     458  VAL*     1.3    75.3    -      -       -      +
     478  GLY*     1.3    57.2    +      -       -      +
     498  ALA*     3.4     7.9    +      -       -      +
     508  GLU*     2.8    30.8    +      -       -      +
     538  ARG*     5.8     3.8    -      -       -      +
    1038  LEU*     6.0     7.2    -      -       -      +
    1078  GLU*     5.9     0.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 47 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     438  LYS      3.5     5.5    +      -       -      -
     448  ILE      3.3     7.8    +      -       -      -
     458  VAL      3.1     0.8    -      -       -      -
     468  ARG*     1.3    79.2    -      -       -      +
     488  GLU*     1.3    56.1    +      -       -      +
     508  GLU*     3.7     6.9    -      -       -      +
     518  GLN*     2.9    32.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 48 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     208  PHE*     3.6    11.7    -      -       +      +
     238  GLN*     3.4    26.6    -      -       -      +
     248  ILE*     3.1    51.9    +      -       +      +
     278  ILE*     4.8    10.1    -      -       +      -
     448  ILE      3.6    13.6    +      -       -      +
     458  VAL*     3.0    12.6    +      -       +      +
     478  GLY*     1.3    78.1    -      -       -      +
     498  ALA*     1.3    56.5    +      -       -      +
     518  GLN*     4.1     3.6    -      -       -      +
     528  ALA*     3.1    27.5    +      -       -      +
    1038  LEU*     6.1     1.3    -      -       +      -
    1068  LYS*     4.7     2.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 49 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     458  VAL      3.2     6.2    +      -       -      +
     468  ARG*     3.8    10.5    -      -       -      +
     488  GLU*     1.3    74.3    -      -       -      +
     508  GLU*     1.3    65.1    +      -       -      +
     528  ALA*     3.2     7.5    +      -       -      +
     538  ARG*     3.0    50.5    +      -       -      +
     998  ILE*     4.7     8.2    -      -       +      +
    1038  LEU*     3.8    31.4    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 50 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   19280    G      3.6    10.6    +      -       -      +
   19290    U      3.1    49.7    -      -       -      +
   19460    U      2.9    24.8    -      -       -      +
     468  ARG      2.8    17.8    +      -       -      +
     478  GLY*     3.7     8.1    -      -       -      +
     488  GLU      3.4     0.2    -      -       -      -
     498  ALA*     1.3    79.3    -      -       -      +
     518  GLN*     1.3    63.5    +      -       +      +
     528  ALA      3.3     0.5    +      -       -      -
     538  ARG*     3.4     9.4    +      -       -      +
     548  VAL*     2.9    25.5    +      -       +      +
     578  ARG*     4.8     0.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 51 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     208  PHE*     5.6    10.8    -      -       +      -
     478  GLY      2.9    17.9    +      -       -      +
     488  GLU*     4.2     3.8    -      -       -      +
     508  GLU*     1.3    79.3    -      -       +      +
     528  ALA*     1.3    61.9    +      -       -      +
     548  VAL*     3.5    20.4    -      -       -      +
     558  ALA*     3.1    21.2    +      -       +      +
     588  ASN*     5.0     1.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 52 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     208  PHE*     4.4    21.5    -      -       +      -
     488  GLU      3.1    19.6    +      -       -      +
     498  ALA*     3.4     9.6    -      -       -      +
     508  GLU      3.1     0.4    -      -       -      -
     518  GLN*     1.3    75.8    -      -       -      +
     538  ARG*     1.3    66.2    +      -       +      +
     558  ALA*     3.2     7.0    +      -       -      +
     568  VAL*     3.0    31.1    +      -       +      +
     998  ILE*     4.5    24.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 53 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   19260    U      3.9    30.7    +      -       -      +
   19270    U      5.5     4.8    +      -       -      +
   19280    G      4.6     4.9    +      -       -      +
   19290    U      3.2    30.7    +      -       -      -
     468  ARG*     5.8     4.2    -      -       -      +
     498  ALA*     3.0    42.3    +      -       -      +
     508  GLU*     3.4    18.5    +      -       -      +
     528  ALA*     1.3    75.5    -      -       +      +
     548  VAL*     1.3    62.5    +      -       -      +
     568  VAL*     3.2     8.2    +      -       -      +
     578  ARG*     3.0    32.6    +      -       -      +
     968  ILE*     5.0    17.8    -      -       +      +
     998  ILE*     5.6     4.5    -      -       +      +
    1008  GLU*     2.5    34.7    +      -       -      -
    1038  LEU*     5.8     0.6    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 54 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   19460    U      3.3    57.0    -      -       +      +
     508  GLU*     2.9    24.9    -      -       +      +
     518  GLN*     3.5    17.3    -      -       -      +
     538  ARG*     1.3    74.0    -      -       -      +
     558  ALA*     1.3    52.9    +      -       -      +
     578  ARG*     2.8    17.1    +      -       -      +
     588  ASN*     2.7    47.0    +      -       -      +
     618  ARG*     3.2    11.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 55 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     138  MET*     5.1     0.6    -      -       -      +
     168  CYS*     4.9     9.7    -      -       +      -
     208  PHE*     4.2    24.5    -      -       +      -
     518  GLN*     3.1    20.0    +      -       -      +
     528  ALA      3.4     6.7    -      -       -      +
     548  VAL*     1.3    79.6    -      -       -      +
     568  VAL*     1.3    62.4    +      -       +      +
     588  ASN*     3.1    15.5    +      -       -      +
     598  VAL*     3.3    23.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 56 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     138  MET*     3.1    42.2    -      -       +      +
     168  CYS*     6.6     0.7    -      -       +      -
     178  VAL*     5.5     7.9    -      -       +      -
     208  PHE*     5.9     2.9    -      -       +      -
     528  ALA*     3.0    21.5    +      -       +      +
     538  ARG*     3.7     7.2    -      -       -      +
     548  VAL      3.1     0.4    -      -       -      -
     558  ALA*     1.3    79.2    -      -       +      +
     578  ARG*     1.3    61.1    -      -       -      +
     598  VAL      4.4     0.2    -      -       -      -
     608  ARG*     3.9     1.7    +      -       -      +
     928  THR*     3.7    42.0    +      -       +      +
     958  ALA*     3.7    22.2    -      -       +      -
     968  ILE*     5.0     8.1    -      -       +      -
     998  ILE*     5.7     3.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 57 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   19190    A      4.9     1.0    +      -       -      -
   19250    C      2.7    81.1    +      -       +      +
   19260    U      4.3    21.7    +      -       -      +
   19280    G      3.7    28.1    +      -       -      -
   19460    U      3.5    34.1    +      -       -      +
     508  GLU*     4.8     1.2    +      -       -      -
     538  ARG*     3.0    17.1    +      -       -      +
     548  VAL*     2.8    22.6    +      -       -      +
     568  VAL*     1.3    80.0    -      -       +      +
     588  ASN*     1.3    55.4    +      -       -      +
     598  VAL      3.4     0.2    -      -       -      -
     608  ARG*     3.1     7.1    +      -       -      +
     618  ARG*     2.7    50.1    +      -       -      +
     928  THR*     5.3     4.9    -      -       +      -
     968  ILE*     5.7     0.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 58 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   19460    U      4.5     7.1    -      -       -      +
     518  GLN*     5.0     1.6    +      -       -      -
     548  VAL*     2.7    43.8    +      -       -      +
     558  ALA*     3.1    13.9    -      -       -      +
     578  ARG*     1.3    72.3    -      -       -      +
     598  VAL*     1.3    66.0    +      -       +      +
     618  ARG*     2.3    32.8    +      -       -      +
     628  ASP*     2.9    37.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 59 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      88  ASP*     5.1     0.9    -      -       -      +
      98  ALA*     4.2    28.7    -      -       +      +
     128  ARG*     5.1    15.7    -      -       +      +
     138  MET*     3.2    40.2    -      -       +      +
     168  CYS*     6.4     1.6    -      -       -      -
     558  ALA      3.3    17.9    -      -       -      +
     588  ASN*     1.3    76.1    -      -       +      +
     608  ARG*     1.3    57.9    +      -       -      +
     628  ASP*     4.3     5.6    -      -       -      -
     638  ALA*     3.0    35.7    +      -       +      +
     888  VAL*     5.9     0.3    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 60 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   19240    C      2.7    56.3    +      -       -      +
   19250    C      2.7    58.7    +      -       -      -
     138  MET*     4.0     4.2    -      -       +      +
     568  VAL      3.9    10.5    +      -       -      +
     578  ARG*     3.1    11.3    +      -       -      +
     588  ASN      3.0     0.6    -      -       -      -
     598  VAL*     1.3    81.6    -      -       -      +
     618  ARG*     1.3    66.0    +      -       -      +
     628  ASP      3.2     1.0    +      -       -      -
     648  ASN*     3.1    28.5    +      -       +      +
     858  GLN*     4.4    15.8    +      -       -      +
     888  VAL*     4.0    22.0    -      -       +      +
     898  GLN*     3.5    25.6    +      -       -      +
     928  THR*     4.3     7.4    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 61 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   19240    C      2.7    43.0    -      -       -      +
   19250    C      3.0    12.7    +      -       -      +
   19460    U      2.5    39.9    +      -       -      -
   19480    C      3.6    31.4    -      -       -      +
     548  VAL*     3.2    15.2    +      -       -      +
     578  ARG*     2.7    25.1    +      -       -      +
     588  ASN*     2.3    52.6    +      -       -      +
     608  ARG*     1.3    82.2    -      -       -      +
     628  ASP*     1.3    62.4    +      -       -      +
     648  ASN*     4.8     2.2    -      -       -      -
     658  ASP*     3.5    19.1    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 62 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     588  ASN*     2.9    28.2    +      -       -      +
     598  VAL*     4.1     4.3    -      -       -      +
     608  ARG      3.2     0.8    +      -       -      -
     618  ARG*     1.3    81.4    -      -       -      +
     638  ALA*     1.3    65.5    +      -       -      +
     648  ASN      3.2     1.7    +      -       -      -
     658  ASP*     3.7     7.1    +      -       -      +
     668  LYS*     3.2    36.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 63 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      58  ILE*     4.3    23.8    -      -       +      +
      88  ASP*     4.6     9.6    -      -       -      +
      98  ALA*     5.3     4.7    -      -       +      -
     128  ARG*     6.1     1.3    -      -       -      +
     598  VAL*     3.0    26.1    +      -       +      +
     628  ASP*     1.3    74.8    -      -       -      +
     648  ASN*     1.3    63.3    +      -       -      +
     668  LYS*     3.5    26.1    +      -       +      +
     678  VAL*     3.6    14.7    +      -       -      +
     888  VAL*     5.8     6.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 64 (chain 8). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   19240    C      5.5     4.6    +      -       -      -
   19480    C      4.3     5.9    +      -       -      -
     608  ARG*     3.1    22.6    +      -       +      +
     618  ARG*     4.9     2.7    -      -       -      -
     628  ASP      3.2     0.4    -      -       -      -
     638  ALA*     1.3    76.2    -      -       -      +
     658  ASP*     1.3    67.7    +      -       -      +
     668  LYS      3.1     1.8    -      -       -      -
     678  VAL*     3.0     7.3    +      -       -      +
     688  LYS*     2.7    45.3    +      -       -      +
     818  ASP*     5.3     3.6    -      -       -      +
     848  SER*     4.9    11.4    +      -       -      -
     858  GLN*     3.7    23.8    +      -       -      +
     888  VAL*     6.1     4.9    -      -       +      -
----------------------------------------------------------
 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