Contacts of the helix formed by residues 168 - 196 (chain C) in PDB entry 3KQG


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with ASN 168 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167A  LEU*     4.6     9.5    -      -       -      +
    170A  LYS*     5.4     8.5    -      -       -      +
    167C  LEU*     1.3    75.8    -      -       +      +
    169C  THR*     1.3    57.6    +      -       -      +
    170C  LYS      2.9    12.0    +      -       -      -
    171C  ILE*     3.1    31.0    +      -       -      +
    172C  ARG*     3.2    37.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 169 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167C  LEU      3.9    16.6    +      -       -      +
    168C  ASN*     1.3    77.7    -      -       -      +
    170C  LYS*     1.3    65.3    +      -       -      +
    172C  ARG*     3.2    40.3    +      -       -      +
    173C  ALA*     3.3    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 170 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    168B  ASN*     4.0    21.4    +      -       -      +
    171B  ILE*     4.2    31.6    -      -       +      -
    172B  ARG*     5.3     7.4    -      -       -      +
    167C  LEU*     4.0    33.4    +      -       -      +
    168C  ASN      2.9     0.4    -      -       -      -
    169C  THR*     1.3    81.4    +      -       -      +
    171C  ILE*     1.3    66.7    +      -       +      +
    173C  ALA*     3.1     7.7    +      -       -      +
    174C  LEU*     3.1    27.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 171 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167A  LEU*     4.0    22.2    -      -       +      -
    170A  LYS*     4.8    14.8    -      -       +      +
    171A  ILE*     3.6    29.8    -      -       +      +
    174A  LEU*     3.6    21.5    -      -       +      -
    171B  ILE*     4.2     8.3    -      -       +      -
    168C  ASN*     3.1    20.1    +      -       -      +
    170C  LYS*     1.3    78.8    -      -       +      +
    172C  ARG*     1.3    66.3    +      -       +      +
    174C  LEU*     3.1    14.4    +      -       +      +
    175C  GLN*     3.0    46.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 172 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167C  LEU      5.2     0.4    -      -       -      +
    168C  ASN*     3.2    41.2    +      -       -      +
    169C  THR*     3.3    45.8    -      -       -      +
    170C  LYS      3.3     0.2    -      -       -      -
    171C  ILE*     1.3    78.9    -      -       +      +
    173C  ALA*     1.3    61.6    +      -       -      +
    175C  GLN*     3.6    15.4    +      -       -      +
    176C  GLY*     3.2    17.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 173 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169C  THR      3.3    10.6    +      -       -      +
    170C  LYS*     3.1    10.2    +      -       -      +
    171C  ILE      3.1     0.4    -      -       -      -
    172C  ARG*     1.3    77.2    -      -       -      +
    174C  LEU*     1.3    65.4    +      -       +      +
    176C  GLY*     3.1     3.4    +      -       -      +
    177C  SER*     2.9    27.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 174 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174A  LEU*     3.8    24.9    -      -       +      -
    171B  ILE*     3.3    35.7    -      -       +      +
    174B  LEU*     4.4    10.3    -      -       +      -
    175B  GLN*     4.0    34.1    -      -       +      +
    178B  LEU*     3.8    20.0    -      -       +      +
    170C  LYS*     3.1    19.6    +      -       +      +
    171C  ILE*     3.1     9.3    +      -       +      +
    173C  ALA*     1.3    72.0    -      -       -      +
    175C  GLN*     1.3    68.5    -      -       -      +
    176C  GLY      2.8     2.3    +      -       -      -
    177C  SER*     2.9     6.0    +      -       -      +
    178C  LEU*     2.9    23.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 175 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170A  LYS*     4.1    26.9    +      -       -      +
    174A  LEU*     3.7    29.5    -      -       +      +
    171C  ILE*     3.0    26.9    +      -       -      +
    172C  ARG*     3.7    22.1    -      -       -      +
    174C  LEU*     1.3    78.0    -      -       -      +
    176C  GLY*     1.3    56.9    +      -       -      +
    178C  LEU*     3.5     4.2    +      -       -      +
    179C  GLU*     2.9    47.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 176 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172C  ARG      3.2    11.0    +      -       -      -
    173C  ALA*     3.1     8.9    +      -       -      -
    174C  LEU      2.8     2.2    +      -       -      -
    175C  GLN*     1.3    74.7    -      -       -      +
    177C  SER*     1.3    62.9    +      -       -      +
    179C  GLU*     3.3    11.1    +      -       -      +
    180C  ASN*     2.8    32.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 177 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178B  LEU*     3.8    18.9    -      -       -      +
    173C  ALA*     2.9    14.0    +      -       -      +
    174C  LEU*     2.9     6.5    +      -       -      +
    176C  GLY*     1.3    74.2    -      -       -      +
    178C  LEU*     1.3    53.5    +      -       -      +
    180C  ASN*     3.1     8.1    +      -       -      +
    181C  MET*     2.7    40.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 178 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174A  LEU*     3.6    25.4    -      -       +      -
    177A  SER*     3.6    31.6    -      -       -      +
    178A  LEU*     3.9    21.3    -      -       +      -
    181A  MET*     4.0    28.5    -      -       +      -
    178B  LEU*     4.1    14.4    -      -       +      +
    174C  LEU      2.9    15.1    +      -       -      +
    175C  GLN*     3.6     6.1    -      -       -      +
    177C  SER*     1.3    78.2    -      -       -      +
    179C  GLU*     1.3    58.0    +      -       +      +
    181C  MET*     3.4     4.7    +      -       +      +
    182C  SER*     2.8    27.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 179 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175C  GLN*     2.9    36.5    +      -       -      +
    176C  GLY*     3.6    11.0    -      -       -      +
    177C  SER      3.2     0.4    -      -       -      -
    178C  LEU*     1.3    76.8    -      -       +      +
    180C  ASN*     1.3    63.2    +      -       -      +
    182C  SER*     3.3     8.8    +      -       -      -
    183C  LYS*     3.0    33.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 180 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    176C  GLY*     2.8    17.2    +      -       -      +
    177C  SER*     3.6     8.5    -      -       -      +
    179C  GLU*     1.3    76.8    -      -       -      +
    181C  MET*     1.3    66.0    +      -       -      +
    183C  LYS*     3.2    13.6    +      -       -      +
    184C  LEU*     3.1    32.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 181 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181A  MET*     3.5    32.1    -      -       +      -
    185A  LEU*     4.6     4.5    -      -       +      -
    178B  LEU*     3.4    43.1    -      -       +      +
    181B  MET*     3.4    28.9    -      -       +      -
    182B  SER*     3.8    18.2    -      -       -      -
    185B  LEU*     3.6    22.1    -      -       +      +
    177C  SER*     2.7    22.3    +      -       -      +
    178C  LEU*     3.5     6.5    -      -       +      +
    180C  ASN*     1.3    72.7    -      -       -      +
    182C  SER*     1.3    63.0    +      -       -      +
    184C  LEU*     3.2     6.4    +      -       +      -
    185C  LEU*     3.0    20.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 182 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181A  MET*     4.4    19.9    -      -       -      -
    178C  LEU*     2.8    16.5    +      -       -      -
    179C  GLU*     3.4    13.2    +      -       -      -
    180C  ASN      3.2     0.2    -      -       -      -
    181C  MET*     1.3    76.1    -      -       -      +
    183C  LYS*     1.3    58.5    +      -       -      +
    185C  LEU*     3.4     5.0    +      -       -      +
    186C  LYS*     3.0    28.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 183 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179C  GLU*     3.0    19.8    +      -       -      +
    180C  ASN*     3.6    16.8    -      -       -      +
    181C  MET      3.2     0.4    -      -       -      -
    182C  SER*     1.3    78.2    -      -       -      +
    184C  LEU*     1.3    64.3    +      -       +      +
    186C  LYS*     3.4     8.1    +      -       -      +
    187C  ARG*     3.2    21.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 184 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185B  LEU*     3.9    13.9    -      -       +      -
    180C  ASN*     3.1    22.2    +      -       +      +
    181C  MET*     3.7    10.5    -      -       +      +
    183C  LYS*     1.3    78.2    -      -       +      +
    185C  LEU*     1.3    63.8    +      -       -      +
    187C  ARG*     3.2    13.5    +      -       +      +
    188C  GLN*     2.9    37.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 185 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181A  MET*     4.2    24.2    -      -       +      -
    184A  LEU*     3.8    30.7    -      -       +      -
    185A  LEU*     4.0    19.5    -      -       +      -
    188A  GLN*     3.5    38.4    -      -       +      +
    185B  LEU*     3.8    16.2    -      -       +      +
    181C  MET      3.0    15.6    +      -       -      +
    182C  SER*     3.8     6.3    -      -       -      +
    184C  LEU*     1.3    76.2    -      -       -      +
    186C  LYS*     1.3    58.5    +      -       -      +
    188C  GLN*     4.6     0.9    -      -       +      -
    189C  ASN*     2.9    32.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 186 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182C  SER      3.0    13.9    +      -       -      +
    183C  LYS*     3.5    11.4    -      -       -      +
    184C  LEU      3.1     0.2    -      -       -      -
    185C  LEU*     1.3    78.6    -      -       -      +
    187C  ARG*     1.3    61.6    +      -       -      +
    189C  ASN*     3.4    22.3    +      -       -      +
    190C  ASP*     2.9    62.3    +      -       -      +
    323C  TYR*     5.7     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 187 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183C  LYS      3.2    11.3    +      -       -      +
    184C  LEU*     3.2    17.3    +      -       +      +
    186C  LYS*     1.3    74.7    -      -       -      +
    188C  GLN*     1.3    68.0    +      -       +      +
    190C  ASP*     3.1     4.0    +      -       -      +
    191C  ILE*     3.0    38.4    +      -       +      +
    201C  TYR*     3.2    24.9    +      -       -      -
    204C  GLY*     4.4     9.3    -      -       -      +
    323C  TYR*     3.4    43.8    -      -       +      +
    325C  PRO*     5.7     2.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 188 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    188A  GLN*     4.1    10.9    -      -       -      +
    185B  LEU*     3.1    56.7    +      -       +      +
    186B  LYS*     5.0     0.2    -      -       -      +
    188B  GLN*     3.9     8.8    -      -       -      +
    189B  ASN*     3.4    39.5    +      -       -      +
    192B  LEU*     3.5    18.7    -      -       +      +
    184C  LEU*     2.9    23.7    +      -       -      +
    185C  LEU*     4.0     4.0    -      -       -      +
    187C  ARG*     1.3    77.5    -      -       +      +
    189C  ASN*     1.3    57.1    +      -       -      +
    191C  ILE*     3.3     3.9    +      -       +      -
    192C  LEU*     2.8    31.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 189 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187A  ARG*     5.5     2.9    +      -       -      -
    188A  GLN*     3.0    30.6    +      -       -      +
    191A  ILE*     6.1     0.2    -      -       -      +
    185C  LEU*     2.9    21.6    +      -       +      +
    186C  LYS*     3.4    30.3    -      -       +      +
    188C  GLN*     1.3    77.2    -      -       -      +
    190C  ASP*     1.3    63.4    +      -       -      +
    192C  LEU*     3.2     4.5    +      -       -      +
    193C  GLN*     3.0    58.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 190 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186C  LYS*     2.9    51.4    +      -       -      +
    187C  ARG      3.1     2.0    +      -       -      +
    189C  ASN*     1.3    77.6    +      -       -      +
    191C  ILE*     1.3    62.4    +      -       -      +
    193C  GLN*     3.6     6.9    +      -       -      +
    194C  VAL*     3.4    25.5    +      -       -      +
    206C  PHE*     4.2     2.3    -      -       -      -
    323C  TYR*     2.9    39.2    +      -       +      +
    325C  PRO*     4.8     9.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 191 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    189B  ASN*     5.6     1.1    -      -       -      +
    192B  LEU*     4.1    13.0    -      -       +      -
    193B  GLN*     4.6     9.9    -      -       -      +
    196B  SER*     4.2     2.2    -      -       -      +
    187C  ARG*     3.0    39.4    +      -       +      +
    188C  GLN*     3.6     7.9    -      -       +      +
    190C  ASP*     1.3    76.3    -      -       -      +
    192C  LEU*     1.3    58.9    +      -       -      +
    194C  VAL*     3.3     3.6    +      -       -      +
    195C  VAL*     2.9    32.5    +      -       +      +
    201C  TYR*     3.6    64.6    -      -       +      +
    206C  PHE*     4.1    10.3    -      -       +      -
    323C  TYR*     4.7     6.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 192 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    188A  GLN*     4.1    35.9    -      -       -      +
    191A  ILE*     3.9    26.7    -      -       +      -
    192A  LEU*     4.2    19.5    -      -       +      +
    195A  VAL*     4.7    10.1    -      -       +      -
    192B  LEU*     3.8    24.7    -      -       +      +
    188C  GLN      2.8    17.5    +      -       -      +
    189C  ASN*     3.2     8.0    +      -       -      +
    191C  ILE*     1.3    76.2    -      -       -      +
    193C  GLN*     1.3    62.5    +      -       +      +
    195C  VAL*     4.5     2.0    -      -       +      +
    196C  SER*     2.8    48.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 193 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187A  ARG*     4.6    17.0    -      -       -      +
    191A  ILE*     5.3     4.2    -      -       -      +
    201A  TYR*     3.5    27.1    -      -       -      +
    202A  PHE*     5.9     0.2    -      -       -      -
    203A  LYS      5.5     0.3    +      -       -      -
    189C  ASN*     3.0    48.0    +      -       -      +
    190C  ASP*     4.0     8.3    -      -       -      +
    191C  ILE      3.4     0.2    -      -       -      -
    192C  LEU*     1.3    80.0    -      -       -      +
    194C  VAL*     1.3    62.1    +      -       +      +
    196C  SER*     3.7     6.1    -      -       -      -
    197C  GLN*     2.8    33.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 194 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190C  ASP      3.4    14.8    -      -       -      +
    191C  ILE      3.3     1.9    +      -       -      +
    192C  LEU      3.1     0.2    -      -       -      -
    193C  GLN*     1.3    78.6    -      -       +      +
    195C  VAL*     1.3    61.0    +      -       -      +
    196C  SER      3.1     1.1    -      -       -      -
    197C  GLN*     2.9    28.8    +      -       -      +
    199C  TRP*     3.6    24.6    -      -       +      +
    206C  PHE*     3.3    51.6    -      -       +      -
    321C  ARG*     4.0    19.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 195 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    195A  VAL*     4.5    18.6    -      -       +      +
    200A  LYS*     5.4     0.5    -      -       -      +
    192B  LEU*     4.9     5.4    -      -       +      -
    195B  VAL*     4.6    11.0    -      -       +      +
    196B  SER*     3.3    37.7    -      -       -      +
    191C  ILE*     2.9    21.0    +      -       +      +
    192C  LEU*     4.1     5.6    -      -       +      +
    194C  VAL*     1.3    76.9    -      -       -      +
    196C  SER*     1.3    60.4    +      -       -      +
    197C  GLN      3.1     1.2    +      -       -      -
    198C  GLY*     3.2    11.1    +      -       -      -
    199C  TRP      3.4    23.1    -      -       -      +
    200C  LYS      4.3     1.3    -      -       -      +
    201C  TYR*     3.9    20.2    -      -       +      +
    206C  PHE*     5.1     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 196 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    191A  ILE*     4.0     2.1    -      -       -      +
    195A  VAL*     3.3    27.9    -      -       -      +
    200A  LYS*     3.1    14.6    -      -       -      +
    201A  TYR*     2.9    53.3    +      -       -      +
    192C  LEU*     2.8    30.6    +      -       -      +
    193C  GLN*     3.7     8.7    -      -       -      -
    194C  VAL      3.1     0.2    -      -       -      -
    195C  VAL*     1.3    76.5    -      -       -      +
    197C  GLN*     1.3    58.6    +      -       -      +
    198C  GLY      3.4     1.1    -      -       -      -
----------------------------------------------------------
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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