Contacts of the helix formed by residues 27 - 54 (chain F) in PDB entry 3PJV


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 LEU 27 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110D  ILE*     4.7    17.0    -      -       +      -
    144D  LEU*     4.2    27.4    -      -       +      +
    147D  SER*     3.7    29.4    -      -       -      +
    148D  ALA*     4.5    10.3    -      -       +      -
     24F  MSE      3.7    31.4    -      -       +      +
     25F  VAL*     3.1     2.0    -      -       -      +
     26F  SER*     1.3    87.0    -      -       -      +
     28F  GLU*     1.3    59.0    +      -       -      +
     29F  SER      3.3     2.7    -      -       -      -
     30F  SER*     3.2    17.8    +      -       -      +
     31F  ARG*     2.8    31.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 28 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24F  MSE      4.9     3.2    +      -       -      +
     25F  VAL*     3.0    36.8    +      -       +      +
     27F  LEU*     1.3    76.9    -      -       -      +
     29F  SER*     1.3    60.7    +      -       -      +
     31F  ARG*     3.3    25.0    +      -       -      +
     32F  THR*     2.8    34.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 29 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25F  VAL      4.8     0.2    +      -       -      -
     26F  SER      4.4     8.7    +      -       -      -
     28F  GLU*     1.3    75.7    -      -       -      +
     30F  SER*     1.3    69.6    +      -       -      +
     32F  THR*     3.4     7.3    +      -       -      -
     33F  GLN*     3.2    24.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 30 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144D  LEU*     4.1    15.0    -      -       -      -
    147D  SER*     5.0     4.4    +      -       -      -
     26F  SER      5.3     0.5    +      -       -      -
     27F  LEU*     3.2    23.3    +      -       -      +
     29F  SER*     1.3    82.5    +      -       -      +
     31F  ARG*     1.3    62.8    +      -       -      +
     33F  GLN*     3.4     7.1    +      -       -      +
     34F  TYR*     3.1    49.5    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 31 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109D  LEU      4.8     1.6    +      -       -      -
    110D  ILE*     2.6    46.0    +      -       +      +
    111D  GLY      3.1    18.6    +      -       -      -
    112D  LEU*     3.9    22.6    -      -       +      +
    113D  GLU      5.0     1.0    -      -       -      +
    144D  LEU*     4.4    13.2    -      -       +      +
     24F  MSE      5.5     4.6    +      -       -      -
     27F  LEU*     2.8    17.3    +      -       +      +
     28F  GLU*     3.5    26.0    +      -       -      +
     29F  SER      3.2     0.2    -      -       -      -
     30F  SER*     1.3    74.2    -      -       -      +
     32F  THR*     1.3    69.2    +      -       -      +
     34F  TYR*     3.3     4.5    +      -       -      +
     35F  VAL*     2.9    28.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 32 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28F  GLU*     2.8    24.6    +      -       -      +
     29F  SER*     3.4    10.1    +      -       -      -
     30F  SER      3.4     0.2    -      -       -      -
     31F  ARG*     1.3    82.9    -      -       -      +
     33F  GLN*     1.3    56.8    +      -       -      +
     35F  VAL*     3.4     9.6    +      -       +      +
     36F  ASN*     2.9    43.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 33 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72D  ASP*     3.9    33.9    +      -       -      +
    143D  LYS*     4.9     1.2    -      -       -      +
     29F  SER      3.2    17.4    +      -       -      +
     30F  SER*     3.6     6.0    -      -       -      +
     32F  THR*     1.3    78.0    -      -       -      +
     34F  TYR*     1.3    85.6    +      -       +      +
     36F  ASN*     3.3    10.8    +      -       -      +
     37F  GLN*     3.1    21.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 34 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72D  ASP      5.0     1.8    -      -       -      -
    112D  LEU*     5.3     4.7    -      -       +      -
    140D  ALA*     3.9    32.5    -      -       +      -
    143D  LYS*     3.5    48.1    +      -       +      +
    144D  LEU*     3.5    41.7    -      -       +      -
    147D  SER*     4.7     5.4    +      -       -      -
     30F  SER*     3.1    32.1    +      -       -      +
     31F  ARG*     3.9     3.1    -      -       -      +
     33F  GLN*     1.3    94.4    -      -       +      +
     35F  VAL*     1.3    60.6    +      -       -      +
     37F  GLN*     3.2     9.0    +      -       +      +
     38F  LEU*     2.9    34.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 35 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112D  LEU*     3.5    26.2    -      -       +      -
    113D  GLU*     3.8    41.5    -      -       +      +
    115D  ALA*     3.6     6.6    -      -       +      +
     31F  ARG*     2.9    27.1    +      -       +      +
     32F  THR*     3.7     9.9    -      -       +      +
     34F  TYR*     1.3    77.6    -      -       -      +
     36F  ASN*     1.3    58.7    +      -       -      +
     38F  LEU*     3.3     6.4    +      -       -      -
     39F  ARG*     2.9    45.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 36 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32F  THR*     2.9    29.8    +      -       -      +
     33F  GLN*     3.5     9.1    -      -       -      +
     35F  VAL*     1.3    77.0    -      -       -      +
     37F  GLN*     1.3    57.6    +      -       -      +
     39F  ARG*     3.4    22.1    +      -       -      +
     40F  SER*     3.0    30.1    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 37 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69D  SER      5.9     1.8    -      -       -      +
     72D  ASP*     4.5     7.6    +      -       +      +
     73D  SER*     3.5    42.4    +      -       -      +
     75D  TYR*     3.5    19.1    +      -       -      -
    140D  ALA*     5.7     2.6    -      -       -      +
     33F  GLN*     3.1    14.1    +      -       +      +
     34F  TYR*     3.2    10.6    +      -       +      +
     36F  ASN*     1.3    75.8    -      -       -      +
     38F  LEU*     1.3    83.3    +      -       -      +
     40F  SER*     3.3     8.6    +      -       -      +
     41F  HIS*     2.9    35.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 38 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75D  TYR*     4.9     5.4    -      -       +      +
    112D  LEU*     4.2    24.7    -      -       +      -
    113D  GLU      4.9     9.2    -      -       -      +
    114D  PRO      4.8     4.7    -      -       -      +
    115D  ALA*     4.0     9.9    -      -       +      -
    135D  SER*     3.1    29.2    +      -       -      +
    136D  HIS      3.7    23.6    -      -       -      +
    137D  PRO*     4.3    14.8    -      -       +      -
    140D  ALA*     4.3    10.5    -      -       +      +
     34F  TYR      2.9    22.5    +      -       -      +
     35F  VAL*     3.8     7.2    -      -       -      +
     37F  GLN*     1.3    90.2    -      -       -      +
     39F  ARG*     1.3    57.3    +      -       -      +
     41F  HIS*     4.4     0.7    -      -       -      -
     42F  ALA*     3.0    26.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 39 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113D  GLU*     2.7    33.1    +      -       -      -
    115D  ALA*     3.2    23.7    +      -       +      +
    116D  GLY      4.2    10.0    +      -       -      +
    117D  GLY*     4.9     1.0    -      -       -      -
     35F  VAL*     2.9    28.3    +      -       -      +
     36F  ASN*     3.6    26.0    +      -       -      +
     38F  LEU*     1.3    78.5    -      -       -      +
     40F  SER*     1.3    57.6    +      -       -      +
     42F  ALA*     3.3     2.4    +      -       -      +
     43F  GLN*     2.8    36.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 40 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36F  ASN      3.0    15.1    +      -       -      -
     37F  GLN*     3.3    13.2    +      -       -      +
     39F  ARG*     1.3    77.6    -      -       -      +
     41F  HIS*     1.3    60.1    +      -       -      +
     43F  GLN*     3.8     6.2    -      -       -      +
     44F  ASP*     2.8    42.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 41 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75D  TYR*     3.4    38.0    +      +       -      +
    135D  SER*     2.8    19.7    +      -       -      +
     37F  GLN*     2.9    27.9    +      -       -      +
     38F  LEU*     3.7     4.3    -      -       -      +
     40F  SER*     1.3    79.2    +      -       -      +
     42F  ALA*     1.3    60.6    +      -       -      +
     44F  ASP*     3.5     9.3    +      -       +      +
     45F  ALA*     3.3    21.0    +      -       -      +
     74F  GLY*     6.0     0.4    -      -       -      -
     75F  TYR*     3.9    18.2    +      -       -      -
     76F  TYR*     3.5    32.7    +      +       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 42 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115D  ALA      4.1     4.5    -      -       -      +
    117D  GLY*     3.7     9.6    -      -       -      +
    133D  VAL*     3.5    39.1    -      -       +      +
    135D  SER*     3.2    22.1    +      -       -      +
     38F  LEU      3.0    14.1    +      -       -      +
     39F  ARG      3.7     3.4    -      -       -      +
     41F  HIS*     1.3    73.6    -      -       -      +
     43F  GLN*     1.3    61.3    +      -       -      +
     45F  ALA*     3.2     1.6    +      -       -      +
     46F  ALA*     2.9    29.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 43 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117D  GLY*     3.6     9.3    -      -       -      -
    118D  ASP*     3.0    40.8    +      -       -      +
    119D  ALA*     4.4     0.4    -      -       -      +
     39F  ARG*     2.8    25.0    +      -       +      +
     40F  SER*     3.8     7.6    -      -       -      +
     42F  ALA*     1.3    71.5    -      -       -      +
     44F  ASP*     1.3    68.5    +      -       -      +
     46F  ALA*     3.3     1.6    +      -       -      +
     47F  THR*     3.0    53.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 44 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40F  SER*     2.8    33.1    +      -       -      +
     41F  HIS*     3.7     8.6    -      -       +      +
     43F  GLN*     1.3    74.8    -      -       -      +
     45F  ALA*     1.3    59.3    +      -       -      +
     47F  THR*     3.5     5.3    +      -       -      -
     48F  ALA*     3.1    28.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 45 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133D  VAL*     4.2     8.5    -      -       +      -
     41F  HIS      3.3     8.6    +      -       -      +
     42F  ALA      3.2     7.5    +      -       -      +
     43F  GLN      3.2     0.6    -      -       -      -
     44F  ASP*     1.3    78.6    -      -       -      +
     46F  ALA*     1.3    59.8    +      -       -      +
     48F  ALA*     3.8     4.7    -      -       -      +
     49F  LEU*     2.9    32.8    +      -       -      +
     70F  ILE*     4.9     9.5    -      -       +      +
     76F  TYR*     3.3    37.0    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 46 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117D  GLY      3.8     6.3    -      -       -      +
    118D  ASP*     3.7    35.9    -      -       -      +
    119D  ALA*     3.5     5.2    -      -       -      +
    131D  VAL*     4.0     9.4    -      -       -      +
    133D  VAL*     3.7    15.4    -      -       +      +
     42F  ALA      2.9    16.0    +      -       -      +
     43F  GLN*     3.3     4.5    +      -       -      +
     45F  ALA*     1.3    75.4    -      -       -      +
     47F  THR*     1.3    58.8    +      -       -      +
     49F  LEU*     3.8     0.9    -      -       -      +
     50F  ALA*     2.9    31.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 47 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119D  ALA*     3.9    11.6    -      -       +      +
     43F  GLN*     3.0    33.9    +      -       -      +
     44F  ASP*     3.8     5.4    -      -       -      -
     46F  ALA*     1.3    75.9    -      -       -      +
     48F  ALA*     1.3    66.7    +      -       -      +
     50F  ALA*     3.5     2.1    +      -       -      +
     51F  LEU*     3.1    22.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 48 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44F  ASP      3.1    18.9    +      -       -      +
     45F  ALA*     3.9     4.9    -      -       -      +
     47F  THR*     1.3    77.0    -      -       -      +
     49F  LEU*     1.3    57.8    +      -       -      +
     51F  LEU*     3.3    10.7    +      -       -      +
     52F  SER*     3.0    28.8    +      -       -      -
     70F  ILE*     6.2     3.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 49 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131D  VAL*     3.7    24.2    -      -       +      -
    133D  VAL*     5.1     1.3    -      -       +      -
     45F  ALA      2.9    18.8    +      -       -      +
     46F  ALA      3.9     2.7    -      -       -      +
     48F  ALA*     1.3    76.2    -      -       -      +
     50F  ALA*     1.3    59.6    +      -       -      +
     52F  SER*     2.7    25.4    +      -       -      +
     53F  LEU*     2.9    44.8    +      -       +      +
     66F  LEU*     4.1    21.8    -      -       +      +
     67F  VAL*     4.1    14.8    -      -       +      +
     70F  ILE*     4.4    17.9    -      -       +      +
     79F  ILE*     3.7    30.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 50 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119D  ALA*     3.7    15.3    -      -       +      -
    120D  LEU      3.7    22.2    -      -       -      +
    121D  VAL*     3.8    21.2    -      -       +      +
    131D  VAL*     4.0     7.3    -      -       +      +
     46F  ALA      2.9    18.9    +      -       -      +
     47F  THR      3.8     3.4    -      -       -      +
     49F  LEU*     1.3    75.3    -      -       -      +
     51F  LEU*     1.3    55.2    +      -       -      +
     53F  LEU      3.4     0.9    +      -       -      -
     54F  THR*     2.8    33.1    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 51 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47F  THR*     3.1    15.3    +      -       +      +
     48F  ALA*     3.4    12.6    -      -       -      +
     49F  LEU      3.2     0.2    -      -       -      -
     50F  ALA*     1.3    77.3    -      -       -      +
     52F  SER*     1.3    61.8    +      -       -      +
     54F  THR*     3.3    21.5    +      -       +      +
     55F  PRO*     3.5     6.7    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 52 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48F  ALA      3.0    13.8    +      -       -      -
     49F  LEU*     2.7    34.7    +      -       -      +
     51F  LEU*     1.3    78.3    -      -       -      +
     53F  LEU*     1.3    58.6    +      -       -      +
     55F  PRO*     3.5     5.0    -      -       -      +
     56F  ASN*     3.0    23.7    +      -       -      -
     66F  LEU*     3.5    17.4    -      -       -      +
     70F  ILE*     5.7     1.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 53 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121D  VAL*     4.3    11.0    -      -       +      -
    131D  VAL*     3.8    25.6    -      -       +      -
     49F  LEU*     2.9    35.3    +      -       +      +
     50F  ALA      3.8     4.9    -      -       -      +
     52F  SER*     1.3    77.1    -      -       -      +
     54F  THR*     1.3    60.5    +      -       -      +
     55F  PRO*     3.4     0.4    -      -       -      -
     56F  ASN*     2.8    19.9    +      -       +      -
     57F  ILE*     3.0    22.8    +      -       +      +
     63F  VAL*     3.9    39.7    -      -       +      +
     66F  LEU*     3.9    24.0    -      -       +      -
     67F  VAL*     4.6     0.7    -      -       +      -
     81F  VAL*     4.2    20.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 54 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120D  LEU      5.4     0.3    +      -       -      -
    121D  VAL*     3.9    16.6    -      -       -      +
    122D  SER*     4.1    19.1    +      -       -      +
     50F  ALA      2.8    21.3    +      -       -      -
     51F  LEU*     3.5    13.9    +      -       +      +
     52F  SER      3.3     0.2    -      -       -      -
     53F  LEU*     1.3    78.7    -      -       -      +
     55F  PRO*     1.3    67.3    -      -       +      +
     56F  ASN      3.1     4.5    +      -       -      -
     57F  ILE*     3.7    14.7    +      -       -      +
----------------------------------------------------------
 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