Contacts of the helix formed by residues 45 - 70 (chain I) in PDB entry 1DZG


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with ASN 45 (chain I).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40I  ILE*     5.7     0.2    -      -       -      -
     43I  ALA      4.0     2.4    +      -       -      -
     44I  THR*     1.3    72.9    -      -       -      +
     46I  ARG*     1.3    61.2    +      -       -      +
     47I  ARG*     3.0    22.1    +      -       -      +
     48I  VAL*     3.0    38.3    +      -       +      +
     49I  TRP*     2.8    32.1    +      -       -      +
    125I  LYS*     3.2    46.1    +      -       -      +
    129I  ARG*     3.6    18.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 46 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40I  ILE*     4.8    11.4    -      -       +      -
     44I  THR      3.3     6.2    +      -       -      +
     45I  ASN*     1.3    72.6    +      -       -      +
     47I  ARG*     1.3    63.5    +      -       -      +
     49I  TRP*     3.7     5.5    -      -       -      +
     50I  GLU*     3.0    40.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 47 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45I  ASN*     3.0    18.8    +      -       -      +
     46I  ARG*     1.3    79.2    -      -       -      +
     48I  VAL*     1.3    61.5    +      -       -      +
     50I  GLU*     4.1     6.5    -      -       -      +
     51I  LEU*     3.3    21.7    +      -       -      +
    121I  PHE*     5.1     2.9    -      -       +      -
    122I  PHE*     4.0    38.1    -      -       +      -
    125I  LYS*     4.3    15.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 48 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44I  THR*     6.4     0.9    -      -       +      -
     45I  ASN*     3.0    37.1    +      -       +      +
     47I  ARG*     1.3    75.9    -      -       -      +
     49I  TRP*     1.3    57.1    +      -       -      +
     51I  LEU*     3.8     5.0    -      -       -      +
     52I  SER*     3.0    27.0    +      -       -      -
    122I  PHE      5.1     2.7    -      -       -      -
    125I  LYS*     3.8     7.4    -      -       +      +
    126I  LEU*     3.6    49.8    -      -       +      +
    129I  ARG*     4.0     4.9    -      -       -      +
    417I  LEU*     3.7    32.8    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TRP 49 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38I  GLN*     3.1    37.5    -      -       +      -
     39I  LYS*     3.7    42.0    +      -       +      +
     40I  ILE*     3.6    35.6    -      -       +      +
     41I  PRO*     6.1     0.6    -      -       +      +
     44I  THR*     4.5    13.0    -      -       +      -
     45I  ASN      2.8    20.1    +      -       -      +
     46I  ARG      3.7     3.4    -      -       -      +
     48I  VAL*     1.3    72.3    -      -       -      +
     50I  GLU*     1.3    78.1    +      -       +      +
     52I  SER*     3.2     7.1    +      -       -      -
     53I  LYS*     3.0    31.2    +      -       +      +
    305I  GLN*     4.9     3.2    -      -       -      +
    417I  LEU      5.0     1.3    -      -       -      -
    418I  ASN*     3.2    34.6    +      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 50 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38I  GLN*     5.5     5.2    +      -       -      +
     46I  ARG*     3.0    32.3    +      -       +      +
     47I  ARG*     4.1     3.4    -      -       -      +
     49I  TRP*     1.3    88.8    -      -       +      +
     51I  LEU*     1.3    62.5    +      -       -      +
     53I  LYS*     3.4     6.2    +      -       -      +
     54I  ALA      3.2    16.5    +      -       -      -
     57I  ARG*     4.9     0.3    +      -       -      -
    111I  ILE*     3.6    38.3    -      -       +      +
    122I  PHE*     4.4    13.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 51 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47I  ARG      3.3    16.1    +      -       -      +
     48I  VAL      3.8     2.9    -      -       -      +
     50I  GLU*     1.3    77.7    -      -       -      +
     52I  SER*     1.3    56.3    +      -       -      +
     54I  ALA*     3.1     5.2    +      -       -      +
     55I  ASN*     2.8    48.9    +      -       -      +
    108I  PHE*     3.9    16.8    -      -       +      -
    111I  ILE*     3.7    13.3    -      -       +      +
    119I  ILE*     4.5     3.4    -      -       +      -
    122I  PHE*     3.5    42.1    -      -       +      +
    123I  PHE*     3.5    28.3    -      -       +      -
    126I  LEU*     3.6    28.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 52 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48I  VAL      3.0    19.7    +      -       -      -
     49I  TRP*     3.2     7.3    +      -       -      -
     51I  LEU*     1.3    76.1    -      -       -      +
     53I  LYS*     1.3    53.9    +      -       -      +
     55I  ASN*     3.4     9.8    +      -       -      +
     56I  SER*     2.7    39.8    +      -       -      -
    126I  LEU*     5.5     0.9    -      -       -      +
    417I  LEU      3.7    10.3    -      -       -      -
    418I  ASN*     2.8    41.3    +      -       -      +
    419I  THR*     4.2    11.6    -      -       -      -
    901I  GOL      4.7     0.5    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 53 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49I  TRP*     3.0    21.7    +      -       +      +
     50I  GLU*     3.6    11.0    -      -       -      +
     52I  SER*     1.3    77.8    +      -       -      +
     54I  ALA*     1.3    53.3    +      -       -      +
     56I  SER*     3.1     8.1    +      -       -      -
     57I  ARG*     2.8    58.4    +      -       +      +
    301I  PRO*     5.5     0.3    -      -       -      +
    901I  GOL      5.9     0.7    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 54 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50I  GLU      3.2     9.8    +      -       -      +
     51I  LEU      3.1    10.0    +      -       -      +
     53I  LYS*     1.3    76.2    -      -       -      +
     55I  ASN*     1.3    62.2    +      -       -      +
     57I  ARG*     3.0    29.1    +      -       -      +
     58I  PHE*     3.1    10.7    +      -       -      +
    106I  PHE      4.6     2.5    -      -       -      -
    107I  LYS*     3.6    28.9    -      -       -      +
    108I  PHE*     4.5     9.0    -      -       +      -
    110I  THR*     4.0     2.0    -      -       -      +
    111I  ILE*     3.8    19.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 55 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51I  LEU*     2.8    52.8    +      -       -      +
     52I  SER*     3.6     8.2    -      -       -      +
     54I  ALA*     1.3    72.8    -      -       -      +
     56I  SER*     1.3    57.0    -      -       -      +
     58I  PHE*     3.4     6.1    +      -       -      +
     59I  ALA*     3.0    27.9    +      -       -      +
     80I  PRO*     5.2     1.6    -      -       -      +
     81I  LEU*     4.7    11.8    -      -       +      +
     84I  SER*     3.3    33.3    +      -       -      +
    106I  PHE      5.2     1.1    -      -       -      +
    108I  PHE*     3.4    15.8    -      -       -      -
    123I  PHE*     3.8     8.5    -      -       -      -
    126I  LEU*     4.4     6.7    -      -       -      +
    419I  THR*     6.1     3.3    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 56 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52I  SER      2.7    26.1    +      -       -      -
     53I  LYS*     3.5     7.4    -      -       -      -
     55I  ASN*     1.3    69.9    -      -       -      +
     57I  ARG*     1.3    57.5    +      -       -      +
     59I  ALA*     3.4     8.5    +      -       -      +
     60I  THR*     2.7    35.4    +      -       -      -
    301I  PRO*     4.7     7.9    -      -       -      -
    418I  ASN      4.2     3.1    +      -       -      -
    419I  THR*     4.9     0.2    -      -       -      -
    420I  ILE*     3.2    32.1    +      -       -      +
    901I  GOL      3.3    21.5    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 57 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50I  GLU      4.9     1.0    +      -       -      -
     53I  LYS*     2.8    36.0    +      -       +      +
     54I  ALA*     3.2    32.3    -      -       -      +
     56I  SER*     1.3    71.9    -      -       -      +
     58I  PHE*     1.3    66.4    +      -       -      +
     60I  THR*     3.4     2.6    +      -       -      -
     61I  THR*     3.1    24.8    +      -       -      -
    107I  LYS*     3.6    24.5    -      -       +      +
    110I  THR*     2.6    52.5    +      -       -      +
    111I  ILE*     5.3     0.8    -      -       -      +
    301I  PRO*     3.9    24.8    -      -       +      +
    302I  GLU*     5.1     6.4    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 58 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54I  ALA      3.1     8.1    +      -       -      +
     55I  ASN*     3.6     8.3    -      -       -      +
     57I  ARG*     1.3    76.4    -      -       -      +
     59I  ALA*     1.3    67.5    +      -       -      +
     61I  THR*     3.0     6.8    +      -       -      -
     62I  PHE*     2.9    56.3    +      +       +      +
     80I  PRO*     4.9     5.8    -      -       +      -
     83I  ILE*     4.0    17.3    -      -       +      -
     84I  SER*     3.5    19.5    -      -       -      +
    105I  VAL*     3.4    29.2    -      -       +      -
    106I  PHE*     3.4    48.0    -      +       -      +
    107I  LYS*     3.8     6.1    -      -       -      +
    335I  LEU*     4.1     5.8    -      -       +      -
    338I  MET*     3.9    21.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 59 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55I  ASN      3.0    17.7    +      -       -      +
     56I  SER*     3.5    10.3    -      -       -      +
     58I  PHE*     1.3    77.3    -      -       -      +
     60I  THR*     1.3    66.1    +      -       -      +
     62I  PHE*     4.3     2.1    -      -       -      +
     63I  TYR*     3.1    24.4    +      -       -      +
     78I  LEU*     5.9     0.5    -      -       -      +
     80I  PRO*     3.5    34.7    -      -       +      +
    420I  ILE*     4.5    12.1    -      -       +      -
    423I  MET*     3.3    10.4    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 60 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56I  SER      2.7    18.7    +      -       -      -
     57I  ARG      3.8     3.4    -      -       -      -
     58I  PHE      3.2     0.4    +      -       -      -
     59I  ALA*     1.3    75.1    -      -       -      +
     61I  THR*     1.3    53.6    +      -       -      +
     63I  TYR*     3.2     5.0    +      -       -      +
     64I  GLN*     2.7    41.4    +      -       +      +
    299I  LEU*     3.4    49.4    -      -       +      +
    300I  THR*     4.1     2.7    -      -       -      -
    301I  PRO*     3.5    28.9    -      -       +      +
    304I  LEU*     5.3     8.2    -      -       +      +
    420I  ILE*     5.5     0.7    -      -       -      +
    423I  MET*     4.5     6.0    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 61 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57I  ARG      3.1    12.2    +      -       -      -
     58I  PHE*     3.0    10.2    +      -       -      -
     60I  THR*     1.3    76.7    -      -       -      +
     62I  PHE*     1.3    57.5    +      -       -      +
     64I  GLN*     2.9    15.1    +      -       +      +
     65I  HIS*     2.8    30.5    +      -       +      +
    107I  LYS*     4.1    21.6    +      -       -      -
    338I  MET*     3.6    22.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 62 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58I  PHE*     2.9    50.4    +      +       +      +
     59I  ALA*     4.3     2.2    -      -       -      +
     61I  THR*     1.3    72.0    -      -       -      +
     63I  TYR*     1.3    54.4    +      -       -      +
     65I  HIS*     3.2     2.8    +      -       -      +
     66I  LEU*     2.7    54.1    +      -       +      +
     78I  LEU*     4.1    17.0    -      -       +      -
     83I  ILE*     4.3    10.1    -      -       +      -
    329I  PHE*     5.5     2.7    -      +       -      -
    331I  LEU*     3.5    29.4    -      -       +      -
    334I  GLN*     3.3    39.6    +      -       +      +
    335I  LEU*     4.1    23.6    -      -       +      -
    338I  MET*     3.8    17.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 63 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59I  ALA      3.1    19.1    +      -       -      +
     60I  THR      3.3     2.9    -      -       -      +
     62I  PHE*     1.3    79.4    -      -       -      +
     64I  GLN*     1.3    67.3    +      -       +      +
     66I  LEU*     3.2     5.2    +      -       +      +
     67I  ALA*     2.9    24.8    +      -       +      +
     76I  ILE*     3.7    29.6    -      -       +      -
     78I  LEU*     4.2    13.8    -      -       +      +
    296I  GLU*     2.6    40.0    +      -       +      -
    299I  LEU*     4.6    11.0    -      -       +      -
    409I  LEU*     3.1    25.7    -      -       +      +
    423I  MET*     3.6    36.3    -      -       +      -
    424I  GLY*     3.4    16.9    +      -       -      -
    425I  ARG*     3.4    11.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 64 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60I  THR*     2.7    28.2    +      -       +      +
     61I  THR*     2.9    18.3    +      -       +      +
     63I  TYR*     1.3    76.7    -      -       +      +
     65I  HIS*     1.3    62.0    +      -       -      +
     67I  ALA*     3.4     6.4    +      -       -      +
     68I  ASP*     3.2    22.7    +      -       -      +
    296I  GLU*     3.0    20.1    +      -       -      +
    297I  LYS*     2.9    30.9    +      -       -      +
    299I  LEU*     3.4    21.1    +      -       +      +
    301I  PRO*     6.0     0.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 65 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61I  THR*     2.8    17.1    +      -       +      +
     62I  PHE*     3.3    10.1    -      -       -      +
     64I  GLN*     1.3    70.9    -      -       -      +
     66I  LEU*     1.3    58.2    +      -       -      +
     68I  ASP*     2.8    28.4    +      -       +      +
     69I  SER*     3.1    18.0    +      -       -      -
    334I  GLN*     3.5    32.9    -      -       +      +
    337I  ASP*     3.5    29.2    +      -       +      -
    338I  MET*     4.5    18.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 66 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62I  PHE*     2.7    34.9    +      -       +      +
     63I  TYR*     3.7     4.7    -      -       +      +
     65I  HIS*     1.3    70.8    -      -       -      +
     67I  ALA*     1.3    60.0    +      -       -      +
     69I  SER*     3.2    19.8    +      -       -      +
     70I  LYS*     3.4    40.9    +      -       +      +
     76I  ILE*     4.3     7.0    -      -       +      -
     78I  LEU*     3.9    23.3    -      -       +      -
    329I  PHE*     3.9    28.7    -      -       +      -
    334I  GLN*     3.6    23.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 67 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63I  TYR*     2.9    25.0    +      -       +      +
     64I  GLN*     3.4     7.4    -      -       -      +
     66I  LEU*     1.3    70.3    -      -       -      +
     68I  ASP*     1.3    58.1    +      -       -      +
     70I  LYS*     3.0    26.4    +      -       -      +
     72I  ASP*     5.5     0.7    -      -       -      +
     76I  ILE*     4.1     7.0    -      -       +      +
    296I  GLU*     3.8    17.0    -      -       +      +
    425I  ARG*     3.2    31.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 68 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64I  GLN      3.2     9.5    +      -       -      +
     65I  HIS*     2.8    22.3    +      -       +      +
     67I  ALA*     1.3    75.2    -      -       -      +
     69I  SER*     1.3    58.6    +      -       -      +
     70I  LYS      3.1     6.1    +      -       -      +
    297I  LYS*     5.2    12.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 69 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65I  HIS*     3.1    17.5    +      -       -      -
     66I  LEU*     3.2    22.8    +      -       -      +
     68I  ASP*     1.3    74.3    -      -       -      +
     70I  LYS*     1.3    60.5    +      -       -      +
    334I  GLN*     5.1     4.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 70 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66I  LEU*     3.4    39.0    +      -       -      +
     67I  ALA      3.0    18.8    +      -       -      +
     68I  ASP      3.1     4.8    +      -       -      +
     69I  SER*     1.3    83.6    -      -       -      +
     71I  ASN*     1.3    69.4    +      -       -      +
     72I  ASP*     3.9     5.7    +      -       -      +
     74I  ASP*     4.5    11.0    -      -       +      +
     75I  ASN      4.6     5.0    +      -       -      +
     76I  ILE*     3.6    34.1    -      -       +      +
    327I  ASP*     3.6    23.0    +      -       -      -
    329I  PHE*     4.7     3.8    -      -       -      -
    425I  ARG*     5.1     2.0    +      -       -      +
----------------------------------------------------------
 Back to top of page


A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il