Contacts of the helix formed by residues 132 - 155 (chain F) in PDB entry 1VEQ


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 132 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121E  ARG*     4.9     2.3    -      -       -      +
    124E  ILE*     4.6    19.3    -      -       +      -
    125E  GLU*     4.7    19.1    -      -       -      +
    128E  GLU*     4.7    18.8    -      -       -      +
    135E  GLN*     4.8     8.5    -      -       -      +
    139E  ILE*     4.3    21.9    -      -       +      +
    127F  LEU      5.0     0.7    -      -       -      -
    128F  GLU*     4.5    28.9    +      -       +      +
    130F  LEU      4.3     0.6    +      -       -      -
    131F  ASP*     1.3    71.0    +      -       -      +
    133F  VAL*     1.3    66.8    +      -       +      +
    135F  GLN*     3.0    40.4    +      -       -      +
    136F  ASP*     3.1    10.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 133 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121E  ARG*     4.1     6.5    -      -       -      +
    124E  ILE*     5.1     6.7    -      -       +      -
    139E  ILE*     4.1    17.9    -      -       +      -
    142E  ALA*     3.8    24.2    -      -       +      -
    143E  GLY*     3.9    20.4    -      -       -      +
    146E  GLU*     3.9    10.1    -      -       -      +
     71F  ARG*     3.4    31.4    -      -       -      +
    131F  ASP*     3.2     8.7    +      -       -      +
    132F  LEU*     1.3    73.3    -      -       +      +
    134F  SER*     1.3    57.0    +      -       -      +
    135F  GLN      2.6    15.4    +      -       -      -
    136F  ASP*     3.2    12.5    +      -       -      +
    137F  LEU*     3.2    14.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 134 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17F  VAL*     3.9    25.5    -      -       -      +
     21F  LEU*     4.9     7.4    -      -       -      +
     71F  ARG*     3.0    24.8    +      -       -      +
     75F  LEU*     4.8     1.7    -      -       -      +
    127F  LEU*     3.3    19.0    -      -       -      +
    131F  ASP*     2.5    34.9    +      -       -      -
    132F  LEU      3.5     0.4    -      -       -      -
    133F  VAL*     1.3    73.1    -      -       -      +
    135F  GLN*     1.3    58.0    +      -       -      +
    137F  LEU*     4.0    11.2    -      -       -      +
    138F  LEU*     3.7    17.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 135 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132D  LEU*     5.0     8.3    -      -       -      +
    124F  ILE*     3.5    35.4    +      -       +      +
    127F  LEU*     4.3     9.2    -      -       +      -
    128F  GLU*     3.2    46.5    +      -       -      +
    131F  ASP      3.4    10.4    +      -       -      +
    132F  LEU*     3.0    28.2    -      -       -      +
    133F  VAL      2.6     6.5    +      -       -      -
    134F  SER*     1.3    74.5    -      -       -      +
    136F  ASP*     1.3    65.2    +      -       -      +
    137F  LEU      2.7     6.3    +      -       -      -
    138F  LEU*     2.7    13.3    +      -       -      +
    139F  ILE*     2.8    23.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 136 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136D  ASP*     2.4    36.2    -      -       -      +
    136E  ASP*     2.5    21.0    -      -       -      +
    139E  ILE*     4.0    28.3    -      -       +      +
    140E  ALA*     5.3     6.6    -      -       -      +
    132F  LEU      3.1     5.3    +      -       -      +
    133F  VAL      3.2     1.3    +      -       -      +
    135F  GLN*     1.3    78.6    +      -       -      +
    137F  LEU*     1.3    65.2    +      -       -      +
    139F  ILE*     3.6    10.5    -      -       -      +
    140F  ALA*     3.1    23.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 137 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21F  LEU*     6.1     0.7    -      -       +      -
     67F  GLU*     4.6    27.6    -      -       +      +
     68F  VAL*     4.4     8.7    -      -       +      -
     71F  ARG*     4.7    22.0    -      -       +      -
    133F  VAL*     3.2    18.2    +      -       +      +
    134F  SER*     4.0     8.5    -      -       -      +
    135F  GLN      2.7     0.8    +      -       -      -
    136F  ASP*     1.3    81.8    -      -       -      +
    138F  LEU*     1.3    78.0    +      -       +      +
    140F  ALA*     3.2     7.5    +      -       -      +
    141F  HIS*     3.1    50.4    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 138 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21F  LEU*     4.0    22.7    -      -       +      -
     24F  GLN*     3.1    42.4    -      -       +      +
     28F  TYR*     4.0     6.3    -      -       -      +
     68F  VAL*     4.9     4.7    -      -       +      -
    120F  THR*     3.6    19.2    -      -       +      +
    123F  SER*     5.1     4.9    -      -       -      -
    124F  ILE*     4.1    15.7    -      -       +      -
    127F  LEU*     4.5    11.4    -      -       +      -
    134F  SER      3.7    14.1    +      -       -      +
    135F  GLN      2.7    11.4    +      -       -      +
    137F  LEU*     1.3    93.2    -      -       +      +
    139F  ILE*     1.3    64.2    +      -       -      +
    141F  HIS*     3.2    13.0    +      -       -      +
    142F  ALA*     3.2    10.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 139 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132D  LEU*     4.5    24.2    -      -       +      +
    133D  VAL*     4.1    22.4    -      -       +      +
    136D  ASP*     3.9    28.3    -      -       +      -
    124F  ILE*     3.9    31.2    -      -       +      -
    135F  GLN*     2.8    37.0    +      -       +      +
    136F  ASP*     3.6    15.0    -      -       -      +
    138F  LEU*     1.3    70.8    -      -       -      +
    140F  ALA*     1.3    70.6    +      -       -      +
    142F  ALA*     2.6    22.9    +      -       -      +
    143F  GLY*     3.2     3.1    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 140 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136D  ASP*     5.2     7.6    -      -       -      +
     64F  TYR*     4.5     5.4    +      -       +      -
    136F  ASP*     3.1    12.4    +      -       -      +
    137F  LEU*     3.4    10.8    -      -       -      +
    139F  ILE*     1.3    82.7    -      -       -      +
    141F  HIS*     1.3    69.5    +      -       +      +
    143F  GLY*     3.0    14.1    +      -       -      -
    144F  GLU*     3.6     5.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 141 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28F  TYR*     2.7    28.8    +      +       -      +
     64F  TYR*     3.1    50.0    -      +       +      -
     67F  GLU*     3.0    21.5    +      -       -      -
     68F  VAL*     3.9     7.2    -      -       +      -
    120F  THR*     5.7     0.4    -      -       +      -
    137F  LEU*     3.1    39.5    -      -       +      +
    138F  LEU*     3.4    10.0    -      -       +      +
    139F  ILE      2.8     3.6    +      -       -      -
    140F  ALA*     1.3    77.0    -      -       +      +
    142F  ALA*     1.3    64.8    +      -       -      +
    144F  GLU*     2.9     5.7    +      -       -      +
    145F  LEU*     2.8    39.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 142 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133D  VAL*     3.8    13.0    -      -       +      -
    117F  ILE*     5.6     3.1    -      -       +      +
    120F  THR*     4.4    17.2    -      -       +      +
    121F  ARG*     5.3     1.6    -      -       +      +
    124F  ILE*     4.5     3.8    -      -       +      -
    138F  LEU      3.2     6.7    +      -       -      +
    139F  ILE*     2.6    18.4    +      -       -      +
    141F  HIS*     1.3    73.4    -      -       -      +
    143F  GLY*     1.3    56.8    +      -       -      +
    145F  LEU*     4.1     8.9    -      -       -      +
    146F  GLU*     2.7    57.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 143 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71D  ARG*     4.3     7.3    +      -       -      -
    133D  VAL*     3.9    20.6    -      -       -      +
    139F  ILE      3.2     3.2    +      -       -      -
    140F  ALA      3.0    10.5    +      -       -      -
    141F  HIS      3.0     0.2    +      -       -      -
    142F  ALA*     1.3    77.5    -      -       -      +
    144F  GLU*     1.3    60.3    +      -       -      +
    146F  GLU*     4.1     1.6    -      -       -      +
    147F  LYS*     3.2    26.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 144 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57F  GLN*     4.2     4.6    -      -       -      +
     60F  LEU*     3.5    27.9    -      -       +      +
     64F  TYR*     3.3    23.6    +      -       +      +
    140F  ALA      3.6     4.6    +      -       -      +
    141F  HIS      2.9     2.8    +      -       -      +
    143F  GLY*     1.3    74.3    -      -       -      +
    145F  LEU*     1.3    61.9    +      -       -      +
    147F  LYS*     3.5    21.8    +      -       +      +
    148F  PHE*     2.8    33.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 145 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28F  TYR*     4.5    10.5    -      -       +      +
     31F  LEU*     4.0    18.8    -      -       +      -
     57F  GLN*     3.6    13.7    -      -       -      +
     61F  VAL*     4.5     3.6    -      -       +      -
     64F  TYR*     4.0    15.3    -      -       +      -
    113F  TYR*     3.6    29.4    -      -       +      -
    116F  VAL*     4.7    14.4    -      -       +      -
    117F  ILE*     4.6    12.8    -      -       +      -
    120F  THR*     5.7     4.0    -      -       +      +
    141F  HIS*     2.8    51.5    +      -       +      +
    142F  ALA*     3.6     7.2    -      -       -      +
    144F  GLU*     1.3    74.8    -      -       -      +
    146F  GLU*     1.3    64.4    +      -       -      +
    148F  PHE*     3.2     2.6    +      -       -      +
    149F  GLN*     3.0    20.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 146 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6D  ILE*     3.6    16.6    -      -       +      +
     71D  ARG*     2.8    45.3    +      -       -      +
     74D  THR*     3.4    15.3    -      -       +      +
    133D  VAL*     3.7     1.5    -      -       -      +
    117F  ILE*     3.5    33.4    -      -       +      +
    121F  ARG*     3.0    34.7    +      -       -      -
    142F  ALA*     2.7    36.3    +      -       -      +
    145F  LEU*     1.3    74.2    -      -       -      +
    147F  LYS*     1.3    62.0    +      -       -      +
    149F  GLN*     3.2     7.3    +      -       -      +
    150F  TRP      3.1    15.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 147 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66D  ASP      5.1     0.4    +      -       -      -
     67D  GLU*     5.1    11.5    +      -       -      +
     70D  GLU*     2.7    44.5    +      -       -      +
     71D  ARG*     5.1     1.1    -      -       -      +
     74D  THR*     4.2    17.5    -      -       -      +
    143F  GLY      3.2    19.7    +      -       -      +
    144F  GLU*     3.5    25.5    +      -       +      +
    145F  LEU      3.2     0.2    -      -       -      -
    146F  GLU*     1.3    78.6    -      -       -      +
    148F  PHE*     1.3    64.9    +      -       -      +
    150F  TRP*     2.8    30.3    +      -       +      +
    151F  PHE*     3.3    25.8    +      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 148 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35F  LEU*     4.2    11.0    -      -       +      -
     53F  MET*     4.0    33.7    -      -       +      -
     54F  ILE*     4.7     5.2    -      -       +      -
     57F  GLN*     3.0    50.3    -      -       +      +
    109F  LEU*     4.2     7.6    -      -       +      -
    113F  TYR*     3.4    38.4    -      +       -      -
    144F  GLU      2.8    15.8    +      -       -      +
    145F  LEU      3.6     2.7    -      -       -      +
    147F  LYS*     1.3    74.6    -      -       -      +
    149F  GLN*     1.3    65.9    +      -       -      +
    151F  PHE*     2.8    39.9    +      +       +      +
    152F  VAL*     3.1    28.0    +      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 149 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6D  ILE*     5.0     3.6    -      -       -      +
      7D  PRO*     4.0     5.7    -      -       -      +
     74D  THR*     5.7     1.4    -      -       -      +
    110F  ASP*     3.4    16.1    +      -       -      +
    113F  TYR*     3.5    23.3    -      -       +      +
    114F  ASN*     2.9    32.5    +      -       -      +
    117F  ILE*     3.4    19.3    -      -       +      +
    145F  LEU      3.0    12.6    +      -       -      +
    146F  GLU*     3.2    11.4    -      -       -      +
    148F  PHE*     1.3    77.8    -      -       -      +
    150F  TRP*     1.3    65.6    +      -       -      +
    152F  VAL*     2.7    23.1    +      -       +      +
    153F  ARG*     2.8    47.1    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TRP 150 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4D  PHE*     4.5    12.5    -      +       -      -
     70D  GLU*     4.2    35.9    -      -       +      -
     73D  ALA*     3.4    47.0    +      -       +      +
     74D  THR*     3.7    27.6    -      -       +      +
    146F  GLU      3.1     2.6    +      -       -      -
    147F  LYS*     2.8    23.4    +      -       +      +
    149F  GLN*     1.3    79.1    +      -       -      +
    151F  PHE*     1.3    83.9    +      +       -      -
    153F  ARG*     3.0    10.7    +      -       -      +
    154F  ALA*     2.6    46.0    +      -       +      +
    157F  GLU*     5.4     1.6    +      -       -      -
     39G  HIS      5.0     0.2    -      -       -      -
     40G  TRP*     3.7    17.9    -      -       -      -
     42G  VAL      5.2     1.3    -      -       -      -
     43G  VAL*     6.1     0.9    -      -       +      -
     47G  PHE*     4.1    17.9    -      +       -      -
     51G  HIS*     4.4    10.8    -      +       -      -
     99G  ARG*     4.9     4.8    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 151 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70D  GLU*     4.9     1.1    -      -       -      -
     53F  MET*     4.0    21.5    -      -       +      -
    147F  LYS*     3.3    30.7    +      -       +      -
    148F  PHE*     2.8    40.2    +      +       +      +
    150F  TRP*     1.3    89.5    -      +       -      +
    152F  VAL*     1.3    64.3    +      -       -      +
    154F  ALA*     3.3     5.5    +      -       -      +
    155F  HIS*     2.8    23.6    +      -       -      -
     47G  PHE*     3.3    21.1    -      +       -      -
     48G  ILE*     4.1    11.4    -      -       +      -
     51G  HIS*     3.7    33.2    -      +       -      -
     52G  GLU*     6.0     0.7    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 152 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53F  MET*     4.7     1.8    -      -       +      -
    106F  LEU*     3.1    56.4    -      -       +      +
    109F  LEU*     4.3     7.9    -      -       +      -
    110F  ASP*     4.1    14.4    -      -       +      +
    113F  TYR*     5.5     2.5    -      -       +      -
    148F  PHE*     3.3    43.5    -      -       +      +
    149F  GLN*     2.7    15.8    +      -       +      +
    151F  PHE*     1.3    76.2    -      -       -      +
    153F  ARG*     1.3    64.2    +      -       +      +
    155F  HIS*     3.0    19.4    +      -       -      +
    156F  LEU*     3.9     6.0    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 153 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4D  PHE*     3.5    56.5    -      -       +      +
      5D  THR      3.6    23.6    +      -       -      -
      6D  ILE*     4.4     1.6    -      -       -      +
      7D  PRO*     4.1     2.2    -      -       -      +
     74D  THR*     4.9     2.8    +      -       -      +
    110F  ASP*     2.8    32.2    +      -       -      +
    114F  ASN*     3.1    32.7    +      -       -      +
    149F  GLN*     2.8    43.4    +      -       +      +
    150F  TRP*     3.4    10.1    -      -       -      +
    152F  VAL*     1.3    70.0    -      -       +      +
    154F  ALA*     1.3    53.9    +      -       -      +
    155F  HIS      2.8     5.6    -      -       -      -
    156F  LEU*     2.6    39.3    +      -       +      +
    157F  GLU*     3.5    10.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 154 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150F  TRP*     2.6    32.2    +      -       +      +
    151F  PHE      3.3     0.6    +      -       -      +
    153F  ARG*     1.3    71.1    -      -       -      +
    155F  HIS*     1.3    58.4    +      -       -      +
    156F  LEU      3.2     0.7    +      -       -      -
    157F  GLU*     4.1     9.5    +      -       -      -
     43G  VAL*     3.7    20.6    -      -       +      +
     44G  GLY*     3.0    26.7    +      -       -      +
     47G  PHE*     3.6    38.1    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 155 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46F  ASN*     4.4     1.5    +      -       -      -
     49F  GLY*     6.0     0.4    -      -       -      -
     50F  VAL*     4.0    16.2    +      -       +      +
     53F  MET*     3.8     9.6    -      -       +      -
    103F  GLN*     4.0     9.9    +      -       -      +
    106F  LEU*     3.4    27.6    -      -       +      +
    151F  PHE      2.8    20.9    +      -       -      -
    152F  VAL*     3.0    12.2    +      -       -      +
    153F  ARG      2.7     0.8    +      -       -      -
    154F  ALA*     1.3    76.1    -      -       -      +
    156F  LEU*     1.3    63.0    +      -       +      +
    157F  GLU      3.8     0.4    -      -       -      +
     44G  GLY      2.9    17.0    -      -       -      +
     45G  PRO*     3.1    36.6    +      -       -      +
     46G  ASN      4.8     0.6    -      -       -      -
     47G  PHE*     3.3    26.4    +      +       +      -
     48G  ILE*     3.5    33.1    +      -       +      +
----------------------------------------------------------
 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