Contacts of the helix formed by residues 196 - 220 (chain A) in PDB entry 6R7X


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 PRO 196 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182A  LEU*     4.9     4.5    -      -       +      -
    185A  THR*     3.3    42.2    -      -       -      +
    186A  TRP*     4.5     7.9    -      -       +      +
    193A  LYS*     4.0     3.1    -      -       -      +
    194A  TYR      3.6     6.3    -      -       -      +
    195A  GLN*     1.3    88.2    -      -       +      +
    197A  ILE*     1.3    63.9    +      -       -      +
    198A  ASP      3.2     3.3    +      -       -      -
    199A  SER*     3.4    11.8    +      -       -      +
    200A  ILE*     3.1    29.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 197 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    195A  GLN*     3.0    22.3    +      -       +      +
    196A  PRO*     1.3    72.9    -      -       -      +
    198A  ASP*     1.3    58.0    +      -       -      +
    200A  ILE*     3.7     8.9    -      -       +      +
    201A  ARG*     2.9    27.9    +      -       -      +
    209A  ALA*     3.5    27.0    -      -       +      +
    212A  PHE      5.4     0.9    -      -       -      -
    213A  GLY*     4.1    13.7    -      -       -      +
    216A  GLU*     4.0    21.1    -      -       -      +
    268A  MET*     3.9    22.4    -      -       -      -
    271A  ARG*     5.1     6.7    -      -       -      +
    272A  TRP*     3.7    19.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 198 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    196A  PRO*     3.2     0.8    -      -       -      +
    197A  ILE*     1.3    79.6    -      -       -      +
    199A  SER*     1.3    57.6    +      -       -      +
    201A  ARG*     3.3     7.5    +      -       -      +
    202A  GLY*     2.9    23.6    +      -       -      -
    271A  ARG*     2.9    31.8    +      -       -      +
    272A  TRP*     2.9    28.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 199 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181A  LYS      5.5     0.3    +      -       -      -
    182A  LEU*     3.3    26.8    -      -       -      +
    185A  THR*     5.4     2.4    +      -       -      -
    196A  PRO*     3.4    16.2    +      -       -      +
    198A  ASP*     1.3    75.0    -      -       -      +
    200A  ILE*     1.3    60.9    +      -       -      +
    202A  GLY*     3.3     2.2    +      -       -      +
    203A  TYR*     3.0    30.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 200 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182A  LEU*     4.1    17.5    -      -       +      -
    186A  TRP*     3.4    46.9    -      -       +      +
    195A  GLN*     4.0    13.5    -      -       +      -
    196A  PRO*     3.1    25.6    +      -       +      +
    197A  ILE*     3.7     8.1    -      -       -      +
    199A  SER*     1.3    75.6    -      -       -      +
    201A  ARG*     1.3    57.1    +      -       -      +
    204A  PHE*     2.9    36.3    +      -       +      +
    205A  GLY      4.0     0.5    -      -       -      +
    208A  ILE      4.5     0.7    -      -       -      -
    209A  ALA*     3.8    25.6    -      -       -      +
    212A  PHE*     4.3    22.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 201 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90A  LYS*     5.1     8.1    -      -       -      +
    120A  THR*     6.2     1.8    -      -       -      +
    122A  ALA*     4.8     1.2    -      -       -      +
    123A  GLU*     3.4    25.2    +      -       -      +
    197A  ILE      2.9    19.8    +      -       -      +
    198A  ASP*     3.4     8.3    -      -       -      +
    199A  SER      3.2     0.2    -      -       -      -
    200A  ILE*     1.3    76.4    -      -       -      +
    202A  GLY*     1.3    65.9    +      -       -      +
    205A  GLY*     2.9    42.9    +      -       -      +
    206A  GLU*     3.0    29.4    +      -       +      +
    209A  ALA*     3.7     8.7    -      -       +      +
    272A  TRP*     3.6    62.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 202 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120A  THR*     3.8    25.9    +      -       -      -
    121A  MET      5.1     0.3    +      -       -      -
    122A  ALA*     3.7    15.4    +      -       -      +
    198A  ASP      2.9    14.8    +      -       -      -
    199A  SER*     3.3     4.4    +      -       -      -
    201A  ARG*     1.3    85.0    -      -       -      +
    203A  TYR*     1.3    60.0    +      -       -      +
    543A  ARG*     4.6     0.5    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 203 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121A  MET*     6.2     0.7    -      -       +      -
    122A  ALA*     3.7     3.4    -      -       -      +
    174A  HIS*     2.8    29.2    +      +       -      -
    175A  ASP*     3.0    37.5    +      -       +      -
    178A  ALA*     4.5    16.2    -      -       +      +
    179A  LEU*     3.6    26.9    -      -       +      +
    182A  LEU*     4.0    17.3    -      -       +      -
    199A  SER*     3.0    15.9    +      -       -      +
    200A  ILE      4.2     1.3    -      -       -      +
    202A  GLY*     1.3    81.3    -      -       -      +
    204A  PHE*     1.3    88.9    +      +       +      +
    205A  GLY      3.7     1.3    -      -       -      -
    543A  ARG*     2.9    52.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 204 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174A  HIS*     4.3     4.9    -      +       -      -
    179A  LEU*     4.5     3.8    -      -       +      -
    182A  LEU*     3.9     5.2    -      -       +      -
    186A  TRP*     3.6    35.9    -      +       -      -
    200A  ILE*     2.9    24.7    +      -       +      +
    203A  TYR*     1.3   110.1    -      +       +      +
    205A  GLY*     1.3    63.2    +      -       -      +
    207A  THR      5.0     0.2    +      -       -      -
    208A  ILE*     3.5    35.2    -      -       +      +
    537A  MET*     3.3    37.2    -      -       +      -
    543A  ARG*     4.8     3.4    -      -       +      +
    544A  PRO*     3.8    39.5    -      -       +      +
    545A  PHE      5.0     0.7    -      -       -      +
    546A  SER*     4.4     9.7    -      -       -      -
    547A  GLU      5.3     0.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 205 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122A  ALA*     4.2     3.6    -      -       -      +
    200A  ILE      4.0     0.2    -      -       -      +
    201A  ARG*     2.9    29.7    +      -       -      +
    203A  TYR      3.7     1.6    -      -       -      -
    204A  PHE*     1.3    82.9    -      -       -      +
    206A  GLU*     1.3    68.8    +      -       -      -
    207A  THR      3.7     0.7    -      -       -      -
    209A  ALA*     3.6     7.5    +      -       -      +
    546A  SER*     3.7    28.9    +      -       -      -
    547A  GLU      4.7     0.2    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 206 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123A  GLU*     5.8     2.1    -      -       -      +
    201A  ARG*     3.0    38.3    +      -       +      +
    205A  GLY*     1.3    77.5    -      -       -      -
    207A  THR*     1.3    61.1    +      -       -      +
    208A  ILE      3.4     0.7    -      -       -      -
    209A  ALA*     3.8     5.1    -      -       -      +
    210A  LEU*     2.9    30.5    +      -       -      +
    272A  TRP*     3.6    29.8    -      -       +      +
    274A  THR*     3.6    23.2    -      -       +      +
    546A  SER*     5.3     2.4    -      -       -      -
    547A  GLU      3.8     9.7    +      -       -      +
    548A  PRO*     3.8    18.5    -      -       -      +
    549A  SER*     4.2    15.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 207 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    204A  PHE      5.0     0.2    +      -       -      -
    205A  GLY*     3.7     0.6    -      -       -      -
    206A  GLU*     1.3    74.0    -      -       -      +
    208A  ILE*     1.3    65.1    +      -       +      +
    210A  LEU*     3.3     6.8    +      -       +      +
    211A  TYR*     3.0    27.7    +      -       -      +
    494A  THR*     3.5    28.3    -      -       +      +
    498A  TYR*     4.7     2.6    +      -       +      +
    547A  GLU*     2.8    36.2    +      -       +      +
    549A  SER*     3.2    23.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 208 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200A  ILE*     4.5     1.1    -      -       +      -
    204A  PHE*     3.5    37.4    +      -       +      +
    206A  GLU      3.4     0.2    -      -       -      -
    207A  THR*     1.3    79.6    -      -       +      +
    209A  ALA*     1.3    58.2    +      -       -      +
    211A  TYR*     3.3     8.3    +      -       +      +
    212A  PHE*     2.9    59.2    +      -       +      -
    491A  TYR*     3.6    34.3    -      -       +      +
    494A  THR*     3.8    10.8    -      -       +      -
    537A  MET*     3.9    20.6    -      -       +      -
    544A  PRO*     4.3    12.8    -      -       +      -
    545A  PHE      6.0     1.1    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 209 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    197A  ILE*     3.5    16.3    -      -       +      +
    200A  ILE*     3.8    10.4    -      -       +      +
    201A  ARG*     3.7    24.0    -      -       +      +
    205A  GLY      3.6    17.9    +      -       -      +
    206A  GLU      3.5     3.2    +      -       -      +
    207A  THR      3.3     0.6    -      -       -      -
    208A  ILE*     1.3    77.4    -      -       -      +
    210A  LEU*     1.3    59.4    +      -       -      +
    212A  PHE*     3.8     0.6    -      -       -      +
    213A  GLY*     2.9    24.8    +      -       -      -
    268A  MET*     5.2     0.2    -      -       -      +
    272A  TRP*     3.6    21.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 210 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    206A  GLU      2.9    16.9    +      -       -      +
    207A  THR*     3.3     5.8    +      -       -      +
    209A  ALA*     1.3    71.8    -      -       -      +
    211A  TYR*     1.3    61.1    +      -       -      +
    213A  GLY*     4.5     0.9    -      -       -      +
    214A  PHE*     2.9    29.6    +      -       -      +
    261A  TRP*     3.8    10.8    -      -       +      -
    265A  CYS*     4.3     8.3    -      -       -      -
    268A  MET*     3.9    20.4    -      -       +      -
    269A  THR*     3.9    12.1    -      -       +      -
    272A  TRP*     3.7    22.4    -      -       +      -
    498A  TYR*     3.8     5.1    +      -       -      +
    549A  SER*     4.1    15.0    -      -       -      +
    550A  ALA      4.3     1.3    -      -       -      -
    551A  ASN*     3.4    44.9    -      -       -      +
    552A  ILE*     4.1     4.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 211 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207A  THR      3.0    14.2    +      -       -      +
    208A  ILE*     3.6     6.5    -      -       +      +
    209A  ALA      3.3     0.2    -      -       -      -
    210A  LEU*     1.3    77.9    -      -       -      +
    212A  PHE*     1.3    89.5    +      +       -      +
    214A  PHE*     3.2     1.9    +      -       -      +
    215A  LEU*     2.9    38.9    +      -       +      +
    491A  TYR*     5.0     3.6    -      -       -      -
    494A  THR*     4.2    18.2    -      -       +      -
    497A  ASP*     3.2    41.3    +      -       +      +
    498A  TYR*     3.3    34.9    +      +       +      +
    501A  LEU*     4.1    14.7    -      -       +      +
    529A  GLU*     4.6     1.4    -      -       -      +
    533A  ASP*     2.3    34.0    +      -       +      -
    702A   CA      3.4     7.1    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 212 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186A  TRP*     3.6    28.0    -      +       -      -
    195A  GLN*     3.1    39.2    -      -       -      +
    197A  ILE*     5.3     2.0    -      -       +      -
    200A  ILE*     4.3    15.9    -      -       +      -
    208A  ILE*     2.9    47.6    +      -       +      +
    209A  ALA      4.1     2.9    -      -       -      +
    211A  TYR*     1.3    88.3    -      +       -      +
    213A  GLY*     1.3    58.8    +      -       -      +
    215A  LEU*     3.4    14.3    +      -       +      +
    216A  GLU*     2.9    23.2    +      -       -      +
    530A  VAL      4.1     5.6    -      -       -      -
    533A  ASP*     3.7    22.4    -      -       +      -
    534A  ALA      3.6    25.1    -      -       -      -
    537A  MET*     3.9     8.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 213 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    197A  ILE*     4.1    25.7    -      -       -      +
    209A  ALA      2.9    17.7    +      -       -      -
    210A  LEU      3.8     1.1    -      -       -      -
    212A  PHE*     1.3    76.0    -      -       -      +
    214A  PHE*     1.3    57.6    +      -       -      +
    216A  GLU*     3.4     5.2    +      -       -      +
    217A  TYR*     2.9    28.9    +      -       -      +
    261A  TRP*     3.9     7.4    -      -       -      -
    268A  MET*     4.5     7.6    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 214 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    210A  LEU      2.9    18.6    +      -       -      +
    211A  TYR      3.6     3.6    -      -       -      +
    213A  GLY*     1.3    76.0    -      -       -      +
    215A  LEU*     1.3    57.9    +      -       -      +
    217A  TYR*     3.4     4.1    +      +       -      +
    218A  PHE*     2.8    43.6    +      +       +      +
    258A  LEU*     5.2     8.1    -      -       +      -
    261A  TRP*     3.5    56.0    -      +       +      -
    498A  TYR*     3.5    28.5    -      +       +      +
    501A  LEU*     3.7    23.3    -      -       +      -
    552A  ILE*     4.6     7.6    -      -       +      -
    559A  PHE*     3.8    42.2    -      +       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 215 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    211A  TYR*     2.9    38.8    +      -       +      +
    212A  PHE*     3.8    15.0    -      -       +      +
    213A  GLY      3.3     0.2    -      -       -      -
    214A  PHE*     1.3    75.8    -      -       -      +
    216A  GLU*     1.3    55.3    +      -       -      +
    218A  PHE*     3.8     1.2    -      -       +      +
    219A  THR*     2.6    45.4    +      -       -      +
    501A  LEU*     3.7    38.4    -      -       +      -
    526A  ASN*     4.1    13.7    -      -       +      +
    529A  GLU*     4.2     9.9    -      -       +      +
    530A  VAL*     3.7    38.6    -      -       +      +
    533A  ASP*     4.2     3.1    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 216 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    193A  LYS      5.6     0.9    -      -       -      +
    194A  TYR*     4.5     8.7    -      -       -      -
    195A  GLN*     3.3    44.6    +      -       +      +
    197A  ILE*     4.0    17.3    -      -       +      +
    212A  PHE      2.9    11.6    +      -       -      +
    213A  GLY*     3.8     7.6    -      -       -      +
    215A  LEU*     1.3    76.4    -      -       -      +
    217A  TYR*     1.3    65.8    +      -       -      +
    219A  THR*     3.7     5.4    +      -       -      -
    220A  PHE*     3.2    55.9    +      -       +      -
    530A  VAL*     5.1     4.0    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 217 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    213A  GLY      2.9    18.4    +      -       -      +
    214A  PHE*     3.7     8.3    -      +       -      +
    216A  GLU*     1.3    82.3    +      -       -      +
    218A  PHE*     1.3    62.8    +      +       +      +
    220A  PHE*     3.2     8.9    +      -       +      -
    221A  ALA*     3.0    31.2    +      -       +      +
    257A  ILE*     3.1    49.9    +      -       +      +
    260A  LEU*     3.2    27.4    -      -       +      +
    261A  TRP*     3.6    38.1    -      +       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 218 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    214A  PHE*     2.8    39.2    +      +       +      +
    215A  LEU*     4.0     5.2    -      -       -      +
    217A  TYR*     1.3    77.7    -      +       -      +
    219A  THR*     1.3    64.0    +      -       -      +
    221A  ALA*     3.8     3.1    -      -       +      -
    222A  LEU*     3.5    50.5    +      -       +      +
    257A  ILE*     4.7    13.5    -      -       +      -
    258A  LEU*     6.1     3.6    -      -       +      -
    501A  LEU*     4.0    37.7    -      -       +      -
    504A  GLN*     4.7     4.0    -      -       +      -
    505A  PHE*     3.6    50.7    -      +       +      -
    526A  ASN*     4.0     8.5    -      -       -      -
    559A  PHE*     4.3     9.0    -      +       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 219 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    215A  LEU*     2.6    25.2    +      -       -      +
    216A  GLU*     3.9     7.4    -      -       -      -
    217A  TYR      3.2     0.2    -      -       -      -
    218A  PHE*     1.3    78.9    -      -       -      +
    220A  PHE*     1.3    62.8    +      -       +      +
    221A  ALA      3.2     4.1    +      -       -      -
    222A  LEU*     3.7     6.7    +      -       -      +
    223A  ILE*     3.3    18.4    +      -       -      +
    523A  VAL*     4.5     7.9    -      -       +      +
    526A  ASN*     3.3    34.3    +      -       +      +
    527A  PHE*     3.6    37.5    -      -       +      -
    530A  VAL*     4.1     8.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 220 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    192A  LEU*     3.7    43.3    -      -       +      -
    193A  LYS      4.6     8.3    -      -       -      -
    194A  TYR*     3.9    24.9    -      +       -      -
    216A  GLU*     3.2    42.8    +      -       +      +
    217A  TYR*     3.2    11.6    +      -       +      +
    219A  THR*     1.3    80.5    -      -       +      +
    221A  ALA*     1.3    57.0    +      -       -      +
    222A  LEU      3.7     0.2    -      -       -      -
    223A  ILE*     3.6    25.6    -      -       +      +
    224A  PRO*     4.4     7.4    -      -       -      +
    253A  TRP*     5.1     2.6    -      -       -      -
    527A  PHE*     4.5    11.2    -      +       -      -
----------------------------------------------------------
 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