Contacts of the helix formed by residues 165 - 193 (chain H) in PDB entry 6C3P


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 SER 165 (chain H).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95H  SER*     4.8     8.5    +      -       -      -
    157H  PHE*     4.6     2.3    -      -       -      -
    163H  GLY      3.0     5.3    -      -       -      -
    164H  PHE*     1.3    76.1    +      -       -      +
    166H  GLN*     1.3    57.2    +      -       -      +
    167H  LEU*     3.0     5.6    -      -       -      +
    168H  ARG*     2.7    58.5    +      -       -      +
    169H  PHE      3.5     1.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 166 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163H  GLY      3.3    12.1    +      -       -      +
    164H  PHE      3.4     4.0    +      -       -      +
    165H  SER*     1.3    73.6    -      -       -      +
    167H  LEU*     1.3    57.3    +      -       -      +
    169H  PHE*     3.0    14.6    +      -       +      +
    170H  CYS*     3.0    27.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 167 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91H  GLU*     6.3     3.1    -      -       +      -
    165H  SER*     3.0     5.1    -      -       -      +
    166H  GLN*     1.3    75.9    -      -       -      +
    168H  ARG*     1.3    65.2    +      -       -      +
    170H  CYS*     3.9     5.8    -      -       -      +
    171H  LEU*     2.9    40.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 168 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91H  GLU*     5.3     6.6    +      -       -      +
     92H  GLY*     5.8     0.8    -      -       -      -
     95H  SER*     4.0    22.0    +      -       -      -
    106H  LEU*     4.0    30.2    +      -       -      +
    153H  LYS*     4.5    14.1    -      -       -      +
    157H  PHE*     3.5    29.6    -      -       +      -
    165H  SER*     2.7    37.3    +      -       -      +
    167H  LEU*     1.3    72.9    -      -       -      +
    169H  PHE*     1.3    50.8    +      -       -      +
    171H  LEU*     3.5     4.4    +      -       -      +
    172H  THR*     2.6    43.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 169 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    154H  PHE*     3.5    36.4    -      +       -      -
    157H  PHE*     3.4    36.5    -      +       +      -
    158H  LEU*     4.3    27.4    -      -       +      -
    163H  GLY*     6.0     1.1    -      -       -      -
    165H  SER      3.5     1.4    +      -       -      -
    166H  GLN*     3.0    17.8    +      -       +      +
    168H  ARG*     1.3    75.8    -      -       -      +
    170H  CYS*     1.3    69.2    +      -       -      +
    172H  THR*     3.3     2.9    +      -       -      -
    173H  GLY*     3.0    20.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 170 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166H  GLN      3.0    13.8    +      -       -      +
    167H  LEU*     3.9     7.0    -      -       -      +
    169H  PHE*     1.3    84.1    -      -       +      +
    171H  LEU*     1.3    63.8    +      -       +      +
    173H  GLY*     3.8     0.9    -      -       -      -
    174H  LEU*     2.8    36.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 171 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84H  VAL*     4.1     9.6    -      -       +      +
     87H  CYS*     4.1    17.3    -      -       +      +
     88H  GLU*     3.9    41.1    -      -       +      +
     91H  GLU*     5.2     6.7    -      -       +      -
    167H  LEU*     2.9    36.6    +      -       +      +
    168H  ARG*     4.0     4.5    -      -       -      +
    170H  CYS*     1.3    83.5    -      -       +      +
    172H  THR*     1.3    58.4    +      -       -      +
    174H  LEU*     3.2     7.3    +      -       +      +
    175H  LEU*     2.9    40.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 172 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150H  LYS*     4.3    14.1    +      -       -      +
    153H  LYS*     3.4    31.1    +      -       +      +
    154H  PHE*     3.6    39.0    -      -       +      +
    157H  PHE*     5.0     4.9    -      -       +      -
    168H  ARG*     2.6    25.7    +      -       -      +
    169H  PHE*     3.6     5.6    -      -       -      -
    170H  CYS      3.2     0.2    -      -       -      -
    171H  LEU*     1.3    77.2    -      -       -      +
    173H  GLY*     1.3    63.9    +      -       -      +
    175H  LEU*     3.1     7.4    +      -       -      +
    176H  VAL*     3.0    25.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 173 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    154H  PHE*     3.7    23.4    -      -       -      -
    169H  PHE      3.0    11.6    +      -       -      -
    170H  CYS*     3.9     2.0    -      -       -      -
    172H  THR*     1.3    76.4    -      -       -      +
    174H  LEU*     1.3    62.1    +      -       -      +
    176H  VAL*     3.2     7.9    +      -       -      +
    177H  ILE*     2.9    31.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 174 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84H  VAL*     3.6    41.1    -      -       +      -
    170H  CYS*     2.8    24.9    +      -       -      +
    171H  LEU*     3.4     9.9    -      -       +      +
    172H  THR      3.1     0.2    -      -       -      -
    173H  GLY*     1.3    75.7    -      -       -      +
    175H  LEU*     1.3    66.0    +      -       +      +
    177H  ILE*     3.2     8.5    +      -       +      +
    178H  LEU*     2.9    51.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 175 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81H  LEU*     4.4     5.8    -      -       +      -
     84H  VAL*     3.6    32.1    -      -       +      +
     85H  LEU*     3.5    29.2    -      -       +      -
     88H  GLU*     4.5    13.2    -      -       -      +
    150H  LYS*     3.9    23.1    -      -       -      +
    171H  LEU*     2.9    26.5    +      -       +      +
    172H  THR      3.7     4.0    -      -       -      +
    174H  LEU*     1.3    80.1    -      -       +      +
    176H  VAL*     1.3    63.6    +      -       -      +
    178H  LEU*     3.2     4.8    +      -       +      +
    179H  TYR*     2.9    55.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 176 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    147H  PHE*     3.2    21.8    -      -       +      -
    150H  LYS*     3.6    36.1    -      -       +      +
    151H  THR*     3.6    24.7    -      -       +      +
    154H  PHE*     4.1    16.6    -      -       +      -
    172H  THR*     3.0    16.3    +      -       +      +
    173H  GLY*     3.3    10.3    -      -       -      +
    175H  LEU*     1.3    77.0    -      -       -      +
    177H  ILE*     1.3    71.1    +      -       +      +
    179H  TYR*     3.3     0.4    +      -       -      -
    180H  GLY      2.9    18.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 177 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    147H  PHE*     5.4     0.2    -      -       -      -
    173H  GLY*     2.9    16.7    +      -       -      +
    174H  LEU*     3.2    10.3    +      -       +      +
    176H  VAL*     1.3    83.4    -      -       +      +
    178H  LEU*     1.3    63.6    +      -       +      +
    180H  GLY*     3.3     2.3    +      -       -      -
    181H  MET*     2.9    49.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 178 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77H  LEU*     4.3    19.1    -      -       +      +
     80H  MET*     3.9    11.0    -      -       +      -
     81H  LEU*     3.5    48.1    -      -       +      +
     84H  VAL*     4.0     3.1    -      -       +      -
    174H  LEU*     2.9    57.6    +      -       +      +
    175H  LEU*     3.2    10.5    +      -       +      +
    177H  ILE*     1.3    83.5    -      -       +      +
    179H  TYR*     1.3    58.8    +      -       -      +
    181H  MET*     3.3     7.0    +      -       +      +
    182H  LEU*     2.9    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 179 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36H  HIS*     3.8    20.0    +      -       -      -
     81H  LEU*     3.5    19.4    -      -       +      +
     85H  LEU*     4.8     2.3    -      -       -      +
    113H  ALA*     4.7     6.8    -      -       -      +
    143H  TRP*     3.5    37.7    -      +       +      +
    146H  ALA*     3.9    25.4    -      -       +      -
    147H  PHE*     3.5    27.2    -      +       +      +
    150H  LYS*     3.4    36.0    -      -       +      +
    175H  LEU*     2.9    37.6    +      -       +      +
    178H  LEU*     1.3    77.2    -      -       -      +
    180H  GLY*     1.3    57.7    +      -       -      +
    182H  LEU*     3.2     5.5    +      -       -      +
    183H  LEU*     2.9    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 180 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    147H  PHE*     3.5    20.6    -      -       -      -
    176H  VAL      2.9    11.9    +      -       -      -
    177H  ILE*     3.7     3.6    -      -       -      -
    178H  LEU      3.2     0.2    -      -       -      -
    179H  TYR*     1.3    77.8    -      -       -      +
    181H  MET*     1.3    58.0    +      -       -      +
    183H  LEU*     3.1     8.2    +      -       -      +
    184H  LEU*     2.9    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 181 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77H  LEU*     3.5    28.9    -      -       +      -
    177H  ILE*     2.9    38.3    +      -       +      +
    178H  LEU*     3.8     2.7    -      -       +      +
    180H  GLY*     1.3    74.5    -      -       -      +
    182H  LEU*     1.3    57.5    +      -       -      +
    184H  LEU*     3.3    21.9    +      -       +      +
    185H  VAL*     2.9    31.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 182 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74H  ARG*     4.4    24.9    -      -       +      +
     77H  LEU*     3.6    21.9    -      -       +      +
     78H  THR*     4.7     7.4    -      -       -      +
     81H  LEU*     6.0     2.0    -      -       +      -
    143H  TRP*     3.3    60.3    -      -       +      +
    178H  LEU      2.9    14.4    +      -       -      +
    179H  TYR*     3.4    11.4    -      -       -      +
    180H  GLY      3.2     0.2    -      -       -      -
    181H  MET*     1.3    74.9    -      -       -      +
    183H  LEU*     1.3    60.9    +      -       -      +
    185H  VAL*     3.1     8.9    +      -       +      +
    186H  GLU*     2.9    31.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 183 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140H  LEU*     3.6    33.4    -      -       +      +
    143H  TRP*     4.9     7.6    -      -       +      +
    144H  THR*     3.8    24.2    -      -       +      +
    147H  PHE*     5.9     7.4    -      -       +      -
    179H  TYR      2.9    13.3    +      -       -      +
    180H  GLY*     3.4    12.1    -      -       -      +
    182H  LEU*     1.3    76.7    -      -       -      +
    184H  LEU*     1.3    60.8    +      -       +      +
    186H  GLU*     2.9     9.6    +      -       +      +
    187H  VAL*     2.9    40.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 184 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    180H  GLY      2.9    13.5    +      -       -      +
    181H  MET*     3.5    26.7    -      -       +      +
    182H  LEU      3.2     0.2    -      -       -      -
    183H  LEU*     1.3    76.7    -      -       +      +
    185H  VAL*     1.3    60.9    +      -       +      +
    187H  VAL*     3.0    19.9    -      -       +      +
    188H  ASN*     2.7    44.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 185 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69H  PRO      5.4     3.0    -      -       -      +
     70H  GLY*     4.5     8.1    -      -       -      +
     73H  LEU*     4.7     9.2    -      -       +      -
     74H  ARG*     3.5    51.4    -      -       +      +
     77H  LEU*     3.7    20.0    -      -       +      -
    181H  MET      2.9    18.7    +      -       -      +
    182H  LEU*     3.2    12.1    -      -       +      +
    184H  LEU*     1.3    75.2    -      -       +      +
    186H  GLU*     1.3    57.8    +      -       -      +
    188H  ASN*     3.2    14.2    +      -       +      +
    189H  VAL*     2.9    26.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 186 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74H  ARG*     3.9    14.4    +      -       -      -
    136H  LEU*     4.4     4.3    -      -       -      +
    137H  ILE*     3.9    25.8    +      -       -      +
    139H  LEU*     4.4    12.0    -      -       -      +
    140H  LEU*     3.8    40.3    -      -       +      +
    143H  TRP*     5.9     1.1    -      -       +      -
    182H  LEU*     2.9    22.4    +      -       +      +
    183H  LEU*     2.9    15.9    +      -       +      +
    185H  VAL*     1.3    78.5    -      -       -      +
    187H  VAL*     1.3    58.2    +      -       -      +
    189H  VAL*     3.0    14.4    -      -       -      +
    190H  ILE*     2.9    29.8    +      -       +      +
    195H  TYR*     4.7     2.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 187 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140H  LEU*     5.1     6.3    -      -       +      -
    183H  LEU*     2.9    33.9    +      -       +      +
    184H  LEU*     3.0    38.6    -      -       +      +
    186H  GLU*     1.3    75.1    -      -       +      +
    188H  ASN*     1.3    63.3    +      -       -      +
    190H  ILE*     3.5     7.6    -      -       +      +
    191H  ARG*     2.9    31.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 188 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69H  PRO*     5.3     2.2    -      -       -      +
     70H  GLY*     6.5     0.9    -      -       -      -
    184H  LEU*     2.7    45.2    +      -       -      +
    185H  VAL*     3.3    16.0    -      -       -      +
    186H  GLU      3.2     0.2    -      -       -      -
    187H  VAL*     1.3    80.5    -      -       -      +
    189H  VAL*     1.3    58.3    +      -       -      +
    191H  ARG*     3.8     3.7    -      -       -      +
    192H  VAL*     2.9    37.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 189 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68H  PHE*     4.4     7.9    -      -       -      +
     69H  PRO*     3.7    41.4    +      -       +      +
     74H  ARG*     3.5    25.1    -      -       -      +
    124H  TYR*     5.3     3.4    -      -       +      +
    133H  PRO*     6.2     3.6    -      -       +      -
    185H  VAL      2.9    15.5    +      -       -      +
    186H  GLU*     3.0    32.5    -      -       -      +
    188H  ASN*     1.3    75.3    -      -       -      +
    190H  ILE*     1.3    61.8    +      -       -      +
    192H  VAL*     3.9     0.9    -      -       -      +
    193H  ARG*     2.9    28.1    +      -       +      +
    195H  TYR*     4.8     2.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 190 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137H  ILE*     5.8     3.8    -      -       +      -
    140H  LEU*     6.3     2.9    -      -       +      -
    186H  GLU*     2.9    22.2    +      -       +      +
    187H  VAL*     3.5    10.3    -      -       +      +
    188H  ASN      3.2     0.2    -      -       -      -
    189H  VAL*     1.3    77.0    -      -       -      +
    191H  ARG*     1.3    64.8    +      -       -      +
    193H  ARG      2.8    13.7    +      -       -      -
    194H  ARG*     2.9    18.1    +      -       -      -
    195H  TYR*     4.5    17.7    -      -       +      +
    196H  ILE*     6.0     5.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 191 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187H  VAL      2.9    20.6    +      -       -      +
    188H  ASN*     3.8     4.5    -      -       -      +
    190H  ILE*     1.3    73.0    -      -       -      +
    192H  VAL*     1.3    65.8    +      -       +      +
    193H  ARG      3.2     0.3    +      -       -      -
    194H  ARG*     3.2    19.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 192 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69H  PRO*     3.5    37.2    -      -       +      -
    188H  ASN*     2.9    24.3    +      -       +      +
    189H  VAL      3.9     0.4    -      -       -      +
    191H  ARG*     1.3    77.0    -      -       +      +
    193H  ARG*     1.3    58.9    +      -       +      +
    194H  ARG      3.6     1.2    +      -       -      -
    201H  PRO      3.2    12.0    -      -       -      +
    202H  ARG*     3.5    19.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 193 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68H  PHE      6.3     0.4    -      -       -      +
     69H  PRO*     5.7     2.9    -      -       +      -
    133H  PRO*     5.1     8.1    -      -       +      -
    189H  VAL*     2.9    20.5    +      -       +      +
    190H  ILE      2.8     5.8    +      -       -      -
    192H  VAL*     1.3    81.0    -      -       +      +
    194H  ARG*     1.3    47.1    -      -       -      -
    195H  TYR*     2.1    52.8    +      -       +      +
    200H  THR      4.1     0.9    -      -       -      -
    201H  PRO*     3.3    18.3    -      -       +      +
----------------------------------------------------------
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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