Contacts of the helix formed by residues 113 - 139 (chain J) in PDB entry 1F33


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 113 (chain J).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55J  ARG*     3.4     8.9    -      -       -      +
     56J  GLY*     5.1     4.9    -      -       -      -
     57J  ALA      5.6     0.9    +      -       -      -
    112J  HIS*     1.3    80.7    -      -       -      +
    114J  VAL*     1.3    67.9    +      -       -      +
    115J  GLN*     2.8    47.5    -      -       -      +
    116J  ASP*     3.2    32.6    +      -       -      +
    117J  HIS*     3.2    12.5    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 114 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54J  MET*     4.3    12.8    -      -       +      -
     55J  ARG      2.9    37.7    +      -       -      +
     56J  GLY      3.8     5.8    -      -       -      +
     57J  ALA      3.4    26.7    -      -       -      +
     58J  ASN*     5.1     1.1    -      -       +      -
     59J  PHE*     4.1    11.7    -      -       -      -
     62J  VAL*     4.2    23.3    -      -       +      -
    112J  HIS      4.1     1.3    -      -       -      -
    113J  ASN*     1.3    74.2    +      -       -      +
    115J  GLN*     1.3    62.6    +      -       +      +
    117J  HIS*     3.1     4.5    +      -       -      +
    118J  LEU*     2.8    47.1    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 115 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57J  ALA*     5.2     4.6    +      -       +      +
     58J  ASN*     5.9     3.0    -      -       -      +
    113J  ASN*     2.8    23.1    -      -       -      +
    114J  VAL*     1.3    77.2    -      -       +      +
    116J  ASP*     1.3    61.5    +      -       -      +
    118J  LEU*     3.3    11.8    +      -       -      +
    119J  LYS*     3.0    42.7    +      -       -      +
    165J  ASN      3.2    21.6    +      -       -      -
    166J  ILE*     3.3    13.7    -      -       -      +
    167J  GLU*     2.8    52.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 116 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111J  ILE*     4.1    28.5    -      -       +      +
    112J  HIS      4.9     0.5    +      -       -      -
    113J  ASN*     3.2    33.3    +      -       -      +
    115J  GLN*     1.3    78.2    -      -       -      +
    117J  HIS*     1.3    63.2    +      -       -      +
    119J  LYS*     3.2    16.0    +      -       -      +
    120J  GLU*     3.0    26.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 117 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49J  GLN*     4.5     1.8    -      -       -      -
     50J  ALA*     3.4    24.8    -      -       +      -
     53J  ASN*     3.3    19.3    +      -       +      -
     54J  MET*     3.7    27.6    -      -       +      -
    107J  TYR*     2.6    32.3    +      +       -      +
    108J  PRO      4.9     1.6    -      -       -      -
    111J  ILE*     3.2    39.3    +      -       +      +
    112J  HIS*     3.4    24.2    -      -       -      -
    113J  ASN      3.2     7.8    +      -       -      -
    114J  VAL      3.1     7.6    +      -       -      +
    116J  ASP*     1.3    77.5    -      -       -      +
    118J  LEU*     1.3    54.8    +      -       -      +
    120J  GLU      3.1     0.7    +      -       -      -
    121J  LEU*     2.7    40.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 118 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54J  MET*     5.0     0.7    -      -       +      -
     58J  ASN*     5.8     0.4    -      -       -      +
     62J  VAL*     3.8    28.3    -      -       +      -
     65J  MET*     5.0     4.3    -      -       +      -
     66J  LEU*     5.4     0.4    -      -       +      -
    114J  VAL*     2.8    33.9    +      -       +      +
    115J  GLN*     3.4    15.3    -      -       -      +
    117J  HIS*     1.3    76.1    -      -       -      +
    119J  LYS*     1.3    56.9    +      -       -      +
    121J  LEU*     3.4    10.5    +      -       +      -
    122J  ALA*     2.9    25.6    +      -       -      +
    162J  ILE*     3.3    40.7    -      -       +      +
    165J  ASN*     3.7    34.3    -      -       +      +
    166J  ILE*     3.9    10.3    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 119 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115J  GLN*     3.0    33.8    +      -       -      +
    116J  ASP*     3.7    12.7    +      -       -      +
    117J  HIS      3.2     0.2    -      -       -      -
    118J  LEU*     1.3    72.5    -      -       -      +
    120J  GLU*     1.3    67.8    +      -       +      +
    122J  ALA*     3.3     4.3    +      -       -      +
    123J  ASP*     3.1    30.4    +      -       -      +
    166J  ILE*     4.0    37.5    -      -       +      -
    167J  GLU      5.7     0.4    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 120 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107J  TYR*     3.5    22.2    -      -       +      +
    108J  PRO*     3.9    11.2    -      -       +      +
    111J  ILE*     3.7    21.3    -      -       +      +
    116J  ASP*     3.0    17.4    +      -       +      +
    117J  HIS      3.6     5.2    -      -       -      +
    119J  LYS*     1.3    77.6    -      -       -      +
    121J  LEU*     1.3    61.9    +      -       -      +
    123J  ASP*     3.4    12.7    +      -       -      +
    124J  ARG*     2.9    56.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 121 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46J  ILE*     3.9    27.4    -      -       +      +
     47J  THR*     4.2     9.4    -      -       -      -
     50J  ALA*     3.6    33.9    -      -       +      -
     54J  MET*     4.6     1.3    -      -       +      -
     66J  LEU*     3.7    31.2    -      -       +      -
    107J  TYR*     4.0     2.7    -      -       +      +
    117J  HIS      2.7    30.4    +      -       -      +
    118J  LEU*     3.7    11.9    -      -       +      +
    120J  GLU*     1.3    71.4    -      -       -      +
    122J  ALA*     1.3    56.6    +      -       -      +
    124J  ARG*     3.1     3.4    +      -       -      -
    125J  TYR*     2.7    50.6    +      -       +      -
    162J  ILE*     4.1    11.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 122 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118J  LEU      2.9    18.5    +      -       -      +
    119J  LYS*     3.3     9.4    +      -       -      +
    121J  LEU*     1.3    75.8    -      -       -      +
    123J  ASP*     1.3    57.0    +      -       -      +
    125J  TYR*     3.3     0.8    +      -       -      -
    126J  ALA*     2.8    37.2    +      -       -      +
    159J  LEU*     3.5    11.7    -      -       +      +
    162J  ILE*     3.9    14.7    -      -       +      +
    163J  GLU*     4.3    15.7    -      -       +      +
    166J  ILE*     4.3    11.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 123 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119J  LYS*     3.1    16.7    +      -       -      +
    120J  GLU*     3.5    17.4    -      -       -      +
    121J  LEU      3.1     0.2    -      -       -      -
    122J  ALA*     1.3    81.9    -      -       -      +
    124J  ARG*     1.3    70.1    +      -       -      +
    126J  ALA*     3.2     8.3    +      -       -      +
    127J  ILE*     3.1    29.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 124 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43J  LEU*     3.8    19.3    -      -       +      -
     46J  ILE*     4.2    13.7    -      -       +      +
    104J  LEU*     3.8    18.7    -      -       +      +
    105J  LYS*     2.9    55.8    +      -       -      +
    106J  SER      3.7     3.8    +      -       -      -
    107J  TYR*     2.9    35.9    -      -       -      +
    108J  PRO*     3.6    14.3    -      -       -      +
    120J  GLU*     2.9    40.7    +      -       -      +
    121J  LEU*     3.1     5.5    +      -       -      +
    123J  ASP*     1.3    77.4    -      -       -      +
    125J  TYR*     1.3    65.3    +      -       -      +
    127J  ILE*     3.2     9.5    +      -       -      +
    128J  VAL*     3.1    26.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 125 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43J  LEU*     3.5    34.8    -      -       +      -
     47J  THR*     2.6    37.7    +      -       +      +
     66J  LEU*     5.4     0.4    -      -       +      -
     69J  PHE*     3.6    11.0    -      +       -      +
     73J  LEU*     3.5    12.2    -      -       +      +
    121J  LEU*     2.7    44.2    +      -       +      +
    122J  ALA      3.8     2.9    -      -       -      +
    124J  ARG*     1.3    72.9    -      -       -      +
    126J  ALA*     1.3    51.8    +      -       -      +
    128J  VAL*     3.3     1.0    +      -       -      +
    129J  ALA*     2.6    39.6    +      -       -      +
    155J  LEU*     4.2     9.4    -      -       +      +
    158J  PHE*     3.7    36.1    -      +       +      -
    159J  LEU*     4.2    13.5    -      -       +      -
    162J  ILE*     3.5    29.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 126 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122J  ALA      2.8    22.0    +      -       -      +
    123J  ASP*     3.3     9.0    -      -       -      +
    125J  TYR*     1.3    74.0    -      -       -      +
    127J  ILE*     1.3    58.1    +      -       +      +
    129J  ALA*     4.2     0.2    -      -       -      -
    130J  ASN*     2.8    47.9    +      -       -      +
    159J  LEU*     3.9    22.6    -      -       +      +
    163J  GLU*     5.7     1.1    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 127 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39J  GLN*     4.3    10.1    -      -       -      +
    103J  PRO*     4.5    17.3    -      -       +      +
    104J  LEU*     3.9    24.0    -      -       +      -
    105J  LYS*     5.5     2.9    -      -       +      +
    123J  ASP*     3.1    16.5    +      -       +      +
    124J  ARG*     3.2    15.0    +      -       -      +
    126J  ALA*     1.3    78.1    -      -       +      +
    128J  VAL*     1.3    63.8    +      -       -      +
    130J  ASN*     4.1     3.6    -      -       -      +
    131J  ASP*     3.0    28.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 128 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39J  GLN*     3.4    37.2    -      -       +      +
     40J  PHE*     3.7    27.8    -      -       +      -
     43J  LEU*     3.9    17.0    -      -       +      -
    104J  LEU*     3.9    18.2    -      -       +      -
    124J  ARG      3.1    12.6    +      -       -      +
    125J  TYR      3.9     2.5    -      -       -      +
    127J  ILE*     1.3    75.0    -      -       -      +
    129J  ALA*     1.3    58.2    +      -       -      +
    131J  ASP*     3.8     0.3    -      -       -      +
    132J  VAL*     2.9    32.6    +      -       -      +
    155J  LEU*     3.5    23.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 129 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125J  TYR      2.6    24.6    +      -       -      +
    126J  ALA*     3.8     5.2    -      -       -      +
    128J  VAL*     1.3    73.3    -      -       -      +
    130J  ASN*     1.3    63.1    +      -       -      +
    132J  VAL*     3.2    10.3    -      -       -      +
    133J  ARG*     3.0    30.7    +      -       -      +
    155J  LEU*     3.8    23.3    -      -       +      +
    156J  ASP*     3.7    18.2    -      -       -      +
    159J  LEU*     4.4    10.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 130 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126J  ALA*     2.8    38.9    +      -       -      +
    127J  ILE*     4.1     3.1    -      -       -      +
    129J  ALA*     1.3    73.6    -      -       -      +
    131J  ASP*     1.3    63.9    +      -       -      +
    133J  ARG*     2.4    37.2    +      -       -      +
    134J  LYS*     3.3    45.2    +      -       -      +
    159J  LEU*     5.3     4.8    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 131 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35J  ARG*     2.8    40.1    +      -       -      -
     36J  GLN*     3.7     2.5    -      -       -      +
     39J  GLN*     3.0    26.9    +      -       -      +
    103J  PRO*     5.4     0.5    -      -       -      +
    127J  ILE*     3.0    21.3    +      -       +      +
    128J  VAL      3.8     2.9    -      -       -      +
    130J  ASN*     1.3    76.7    -      -       -      +
    132J  VAL*     1.3    64.4    +      -       -      +
    134J  LYS*     3.0    11.5    +      -       -      +
    135J  ALA*     3.0    16.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 132 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36J  GLN*     3.6    28.7    +      -       -      +
     40J  PHE*     4.3    19.7    -      -       +      -
    128J  VAL      2.9    25.5    +      -       -      +
    129J  ALA*     3.2    12.1    -      -       -      +
    131J  ASP*     1.3    73.8    +      -       -      +
    133J  ARG*     1.3    66.8    +      -       -      +
    135J  ALA*     3.2    10.0    +      -       -      +
    136J  ILE*     3.4    13.6    +      -       -      +
    148J  LEU*     3.9    35.2    -      -       +      +
    151J  ALA*     4.6     0.4    -      -       +      -
    152J  SER*     4.0    20.4    -      -       -      +
    155J  LEU*     4.8     2.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 133 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129J  ALA*     3.0    19.7    +      -       -      +
    130J  ASN*     2.4    36.6    +      -       -      +
    131J  ASP      3.2     0.2    -      -       -      -
    132J  VAL*     1.3    76.4    -      -       -      +
    134J  LYS*     1.3    66.0    +      -       +      +
    136J  ILE*     3.4    24.2    -      -       +      +
    137J  GLY      4.4     0.5    +      -       -      -
    152J  SER*     3.7    17.3    -      -       -      +
    156J  ASP*     2.6    45.6    +      -       -      -
    159J  LEU*     6.2     0.8    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 134 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130J  ASN*     3.3    35.8    +      -       -      +
    131J  ASP*     3.0     9.2    +      -       -      +
    133J  ARG*     1.3    80.5    -      -       +      +
    135J  ALA*     1.3    67.3    +      -       -      +
    136J  ILE      3.0     3.4    +      -       -      -
    137J  GLY*     3.1    11.6    +      -       -      -
    138J  GLU*     3.2    14.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 135 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32J  LEU*     3.9    16.2    -      -       +      +
     35J  ARG*     4.3     3.8    -      -       -      +
     36J  GLN*     3.6    23.3    -      -       -      +
    131J  ASP      3.0     8.1    +      -       -      +
    132J  VAL*     3.2    10.1    +      -       -      +
    134J  LYS*     1.3    77.6    -      -       -      +
    136J  ILE*     1.3    57.5    +      -       -      +
    138J  GLU*     3.1    13.9    +      -       -      +
    139J  ALA*     2.9    31.2    +      -       -      +
    148J  LEU*     3.7    16.2    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 136 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132J  VAL      3.4     9.2    -      -       -      +
    133J  ARG*     3.4    20.4    -      -       +      +
    134J  LYS      3.0     0.6    -      -       -      -
    135J  ALA*     1.3    77.6    -      -       -      +
    137J  GLY*     1.3    64.0    +      -       -      +
    139J  ALA*     3.2    20.3    +      -       -      +
    145J  ALA*     4.0    14.7    -      -       +      +
    148J  LEU*     3.9    20.9    -      -       +      -
    149J  THR*     3.4    42.4    -      -       +      +
    152J  SER*     3.7    19.7    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 137 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133J  ARG      4.4     0.8    +      -       -      -
    134J  LYS      3.1     7.0    +      -       -      -
    136J  ILE*     1.3    81.2    -      -       -      +
    138J  GLU*     1.3    59.2    +      -       -      +
    139J  ALA      3.2     6.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 138 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32J  LEU*     3.6    28.6    -      -       +      +
     35J  ARG*     3.8    13.9    +      -       -      -
    134J  LYS*     3.2    13.8    +      -       -      +
    135J  ALA*     3.1    12.4    +      -       -      +
    137J  GLY*     1.3    76.4    -      -       -      +
    139J  ALA*     1.3    61.6    +      -       -      +
    140J  LYS*     3.5    10.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 139 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32J  LEU*     4.0    15.3    -      -       +      -
    135J  ALA      2.9    10.5    +      -       -      +
    136J  ILE      3.3    17.6    -      -       -      +
    137J  GLY      3.2     5.2    -      -       -      +
    138J  GLU*     1.3    76.5    -      -       -      +
    140J  LYS*     1.3    65.5    +      -       -      +
    141J  ASP      4.4     2.2    -      -       -      +
    144J  THR*     4.4     5.6    -      -       +      -
    145J  ALA*     3.9    30.1    -      -       +      +
    148J  LEU*     4.1     6.1    -      -       +      -
----------------------------------------------------------
 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