Contacts of the helix formed by residues 170 - 194 (chain C) in PDB entry 5XVO


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 170 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    164C  PHE*     4.1    11.1    -      -       -      -
    168C  GLN*     3.2    26.1    +      -       -      +
    169C  GLU*     1.3    76.6    -      -       -      +
    171C  ASP*     1.3    64.7    +      -       -      +
    172C  ILE*     2.9    12.6    +      -       +      +
    173C  ASN*     2.6    49.9    +      -       -      +
    174C  ALA*     3.1    21.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 171 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170C  ASN*     1.3    75.9    -      -       -      +
    172C  ILE*     1.3    63.9    +      -       +      +
    174C  ALA*     3.7     7.8    -      -       -      +
    175C  GLY      3.0    18.2    +      -       -      -
    233C  ARG      5.9     0.4    -      -       -      +
    235C  GLU      4.1     3.3    -      -       -      +
    236C  ALA*     4.0     8.0    -      -       -      -
    237C  PHE*     3.6    30.6    +      -       +      +
    240C  MET*     3.1    28.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 172 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160C  PHE*     3.7    47.3    -      -       +      -
    164C  PHE*     3.8    19.7    -      -       +      -
    170C  ASN*     2.9    11.6    +      -       +      +
    171C  ASP*     1.3    78.2    -      -       +      +
    173C  ASN*     1.3    59.5    +      -       -      +
    175C  GLY*     3.4     1.7    +      -       -      -
    176C  LEU*     2.9    33.6    +      -       +      +
    229C  ILE*     3.9     9.4    -      -       +      +
    233C  ARG*     4.0    31.9    -      -       +      +
    240C  MET*     4.0     9.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 173 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    164C  PHE*     3.2    20.5    -      -       -      -
    165C  THR      3.1    23.4    +      -       -      -
    166C  ARG*     2.7    41.1    +      -       -      +
    168C  GLN      2.8    27.1    +      -       -      +
    170C  ASN*     2.6    23.1    +      -       -      +
    172C  ILE*     1.3    72.2    -      -       -      +
    174C  ALA*     1.3    55.7    +      -       -      +
    176C  LEU*     3.1     3.5    +      -       -      +
    177C  ASN*     2.7    46.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 174 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170C  ASN      3.1    18.8    +      -       -      +
    171C  ASP*     3.7     8.7    -      -       -      +
    172C  ILE      3.4     0.2    -      -       -      -
    173C  ASN*     1.3    76.2    -      -       -      +
    175C  GLY*     1.3    57.7    -      -       -      +
    177C  ASN*     3.7     8.6    -      -       -      +
    178C  TYR*     2.9    30.5    +      -       -      +
    237C  PHE*     3.6    25.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 175 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171C  ASP      3.0    14.7    +      -       -      -
    172C  ILE      3.7     2.7    -      -       -      -
    174C  ALA*     1.3    74.9    -      -       -      +
    176C  LEU*     1.3    63.3    +      -       -      +
    178C  TYR*     3.4     1.4    +      -       -      +
    179C  GLY*     3.0    19.2    +      -       -      -
    229C  ILE*     3.6    23.1    -      -       -      +
    237C  PHE*     3.7    13.4    -      -       -      -
    240C  MET*     4.1     4.7    -      -       -      -
    244C  LEU*     3.4    11.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 176 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156C  PHE*     3.9    23.6    -      -       +      -
    160C  PHE*     4.6     3.4    -      -       +      -
    164C  PHE*     4.6     2.0    -      -       +      -
    166C  ARG*     4.0    17.7    -      -       -      +
    172C  ILE*     2.9    28.9    +      -       +      +
    173C  ASN*     3.1    23.3    +      -       -      +
    175C  GLY*     1.3    76.3    -      -       -      +
    177C  ASN*     1.3    57.8    +      -       -      +
    179C  GLY*     3.2     2.3    +      -       -      -
    180C  TYR*     2.8    43.6    +      -       +      +
    225C  VAL*     3.9     3.8    -      -       +      +
    226C  ASP*     3.2    39.5    -      -       +      +
    229C  ILE*     3.9    18.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 177 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166C  ARG*     2.7    33.5    +      -       -      +
    173C  ASN*     2.7    34.1    +      -       -      +
    174C  ALA*     3.7     8.7    -      -       -      +
    176C  LEU*     1.3    71.5    -      -       -      +
    178C  TYR*     1.3    62.8    +      -       -      +
    180C  TYR*     3.3     8.3    +      -       -      +
    181C  THR*     2.9    29.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 178 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174C  ALA      2.9    17.3    +      -       -      +
    175C  GLY      3.7     4.7    -      -       -      +
    176C  LEU      3.3     0.2    -      -       -      -
    177C  ASN*     1.3    77.6    -      -       -      +
    179C  GLY*     1.3    64.4    +      -       -      +
    181C  THR*     3.1    16.4    +      -       -      -
    182C  LEU*     3.1    39.9    +      -       +      +
    237C  PHE*     4.3    11.2    -      +       +      -
    241C  LYS*     3.5    49.1    +      -       +      +
    244C  LEU*     3.8    13.5    -      -       +      -
    245C  PHE*     3.3    27.6    -      +       -      -
     24G    G      5.5     3.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 179 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175C  GLY      3.0    10.1    +      -       -      -
    176C  LEU      3.7     2.5    -      -       -      -
    178C  TYR*     1.3    79.1    -      -       -      +
    180C  TYR*     1.3    62.0    +      -       -      +
    182C  LEU*     3.1    18.7    +      -       -      +
    183C  LEU*     3.2     9.9    +      -       -      +
    225C  VAL*     3.7    24.5    -      -       -      +
    244C  LEU*     3.6    22.4    -      -       -      -
    247C  LEU*     4.8     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 180 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156C  PHE*     3.7    14.8    -      +       -      -
    166C  ARG*     3.4    34.1    -      -       -      -
    176C  LEU*     2.8    26.6    +      -       +      +
    177C  ASN*     3.6     7.2    -      -       -      +
    179C  GLY*     1.3    76.5    -      -       -      +
    181C  THR*     1.3    56.0    +      -       -      +
    183C  LEU*     3.4     4.4    +      -       -      +
    184C  LEU*     2.9    27.5    +      -       -      +
    218C  MET*     3.5    14.4    -      -       +      +
    222C  ARG*     3.4    64.4    +      -       +      +
    225C  VAL*     4.0    12.3    -      -       +      -
    226C  ASP*     2.5    32.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 181 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70C  LYS*     5.3    15.3    -      -       +      -
     72C  LEU*     5.7     8.1    -      -       +      -
    177C  ASN      2.9    17.4    +      -       -      -
    178C  TYR*     3.1    11.7    +      -       -      -
    180C  TYR*     1.3    73.4    -      -       -      +
    182C  LEU*     1.3    69.2    +      -       +      +
    184C  LEU*     3.2    15.4    +      -       +      +
    185C  SER*     3.0    24.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 182 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178C  TYR*     3.1    46.6    +      -       +      +
    179C  GLY*     3.1    12.7    +      -       -      +
    181C  THR*     1.3    76.9    -      -       +      +
    183C  LEU*     1.3    64.0    +      -       +      +
    185C  SER*     2.8    24.9    +      -       -      +
    186C  ILE*     3.2    13.1    +      -       +      +
    244C  LEU*     4.4    11.0    -      -       +      +
    245C  PHE*     4.5    12.3    -      -       +      -
    247C  LEU*     4.4    16.6    -      -       +      -
    248C  PHE*     4.1    31.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 183 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179C  GLY      3.2    10.0    +      -       -      +
    180C  TYR*     3.5     8.5    -      -       +      +
    182C  LEU*     1.3    77.2    -      -       -      +
    184C  LEU*     1.3    66.6    +      -       -      +
    186C  ILE*     3.1    18.3    +      -       +      +
    187C  PHE*     3.2    26.5    +      -       +      -
    218C  MET*     3.8    19.7    -      -       +      -
    221C  PHE*     3.7    43.3    -      -       +      +
    222C  ARG*     4.1     6.3    -      -       -      +
    224C  LEU*     5.5     1.3    -      -       +      -
    225C  VAL*     3.7    21.3    -      -       +      -
    247C  LEU*     4.8    10.8    -      -       +      -
    261C  LEU*     3.9    28.3    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
     72C  LEU*     4.8     8.7    -      -       +      -
    180C  TYR      2.9    15.3    +      -       -      +
    181C  THR*     3.4    18.6    -      -       +      +
    183C  LEU*     1.3    76.6    -      -       -      +
    185C  SER*     1.3    59.5    +      -       -      +
    187C  PHE*     3.2     1.0    +      -       -      -
    188C  ALA*     2.8    29.9    +      -       -      +
    209C  ASN*     5.2     4.7    -      -       -      +
    211C  PHE*     4.0    29.6    -      -       +      +
    214C  ALA*     3.6    27.6    -      -       +      +
    215C  SER*     3.6    26.0    -      -       -      +
    218C  MET*     3.8    13.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 185 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70C  LYS*     6.0     0.9    -      -       -      -
     71C  ARG*     4.1    14.7    +      -       -      +
     72C  LEU*     3.4    29.4    -      -       -      -
    181C  THR*     3.0    12.4    +      -       -      -
    182C  LEU*     2.8    19.2    +      -       -      +
    183C  LEU      3.1     0.2    -      -       -      -
    184C  LEU*     1.3    74.1    -      -       -      +
    186C  ILE*     1.3    65.8    +      -       -      +
    188C  ALA*     3.7     1.1    -      -       -      +
    189C  ARG*     3.1    43.9    +      -       -      +
    248C  PHE*     5.9     1.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 186 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182C  LEU      3.2    13.4    +      -       -      +
    183C  LEU*     3.1    15.8    +      -       +      +
    185C  SER*     1.3    85.6    +      -       -      +
    187C  PHE*     1.3    59.9    +      -       +      +
    189C  ARG*     3.5    26.7    +      -       -      +
    190C  GLU*     3.2    30.2    +      -       +      +
    247C  LEU*     6.5     0.2    -      -       +      -
    248C  PHE*     3.7    29.2    -      -       +      -
    261C  LEU*     4.1    26.0    -      -       +      -
    262C  THR*     4.5    15.0    -      -       +      -
    265C  ALA*     3.5    30.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 187 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183C  LEU*     3.2    30.2    +      -       +      +
    184C  LEU      4.0     4.3    -      -       -      +
    186C  ILE*     1.3    82.6    -      -       +      +
    188C  ALA*     1.3    66.7    +      -       -      +
    189C  ARG      3.2     0.2    -      -       -      -
    190C  GLU*     3.8     3.7    -      -       -      +
    191C  LEU*     3.0    28.6    +      -       -      +
    214C  ALA*     4.2    19.7    -      -       +      +
    217C  LEU*     4.1    18.2    -      -       +      -
    218C  MET*     3.8    22.2    -      -       +      -
    221C  PHE*     3.4    45.8    -      +       +      -
    261C  LEU*     5.8     1.6    -      -       +      -
    265C  ALA*     3.6    31.6    -      -       +      -
    268C  TYR*     4.4     7.2    -      +       -      -
    269C  THR*     3.4    21.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 188 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72C  LEU*     4.1     6.7    -      -       +      -
     73C  PRO*     3.9    14.6    -      -       +      -
    184C  LEU      2.8    17.9    +      -       -      +
    185C  SER      3.7     4.9    -      -       -      +
    187C  PHE*     1.3    78.5    -      -       -      +
    189C  ARG*     1.3    62.0    +      -       -      +
    191C  LEU*     3.4     1.9    +      -       -      +
    192C  VAL*     3.2    28.6    +      -       -      +
    198C  THR*     3.9     5.6    -      -       +      +
    211C  PHE*     3.8    29.2    -      -       +      -
    214C  ALA*     3.8    11.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 189 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41C  LEU*     3.9    27.4    -      -       +      +
     43C  GLU*     2.7    42.4    +      -       -      -
     65C  LEU*     4.9     0.5    -      -       -      +
     67C  CYS*     4.0     9.6    -      -       -      -
     71C  ARG*     3.1    43.5    +      -       -      +
     73C  PRO*     4.1     4.7    -      -       +      +
    185C  SER*     3.1    33.3    +      -       -      +
    186C  ILE*     3.5    29.4    +      -       -      +
    188C  ALA*     1.3    79.6    -      -       -      +
    190C  GLU*     1.3    66.5    +      -       +      +
    192C  VAL*     3.0    24.3    -      -       +      +
    193C  GLN*     3.1    14.4    +      -       -      +
    248C  PHE*     5.4     4.0    -      -       -      -
    262C  THR*     4.5    11.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 190 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41C  LEU*     5.5     1.6    -      -       -      +
    186C  ILE*     3.2    21.4    +      -       +      +
    187C  PHE*     3.8     3.1    -      -       -      +
    188C  ALA      3.3     0.2    -      -       -      -
    189C  ARG*     1.3    82.9    +      -       -      +
    191C  LEU*     1.3    61.5    +      -       -      +
    193C  GLN*     3.3    33.2    +      -       -      +
    194C  THR*     3.2    20.8    -      -       -      +
    262C  THR*     4.3     5.4    -      -       -      +
    265C  ALA*     4.0    18.4    -      -       +      +
    266C  THR*     3.1    43.0    +      -       -      +
    269C  THR*     3.7    23.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 191 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187C  PHE      3.0    19.6    +      -       -      +
    188C  ALA      3.7     4.0    -      -       -      +
    189C  ARG      3.3     0.2    -      -       -      -
    190C  GLU*     1.3    74.9    -      -       -      +
    192C  VAL*     1.3    66.8    +      -       -      +
    194C  THR*     2.7    23.7    +      -       -      -
    196C  CYS*     3.2    18.7    +      -       +      +
    198C  THR*     4.0    13.5    -      -       +      -
    213C  LEU*     3.7    33.2    -      -       +      +
    214C  ALA*     3.6    35.2    -      -       +      +
    217C  LEU*     3.8    22.0    -      -       +      -
    269C  THR*     3.8    12.3    -      -       +      -
    273C  VAL*     4.2    16.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 192 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41C  LEU*     5.9     0.2    -      -       +      -
     63C  LEU*     4.5     2.6    -      -       -      +
     65C  LEU*     4.1    16.0    -      -       +      +
     73C  PRO*     3.8    31.0    -      -       +      -
     76C  LYS*     4.2    12.2    +      -       -      +
     86C  SER*     4.2     1.2    +      -       -      -
    188C  ALA      3.2    12.5    +      -       -      +
    189C  ARG*     3.0    26.0    -      -       +      +
    191C  LEU*     1.3    78.9    -      -       -      +
    193C  GLN*     1.3    62.3    +      -       -      +
    195C  GLY*     3.0    13.3    +      -       -      -
    196C  CYS      3.7    16.2    -      -       -      +
    197C  PHE*     5.6     0.4    -      -       -      -
    198C  THR*     4.0    13.2    -      -       +      +
     80D  PHE*     4.1    26.7    -      -       +      -
     81D  TYR*     4.2     6.1    -      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
      5C  THR*     3.2    31.2    +      -       -      +
      7C  VAL*     5.4     1.2    -      -       -      +
     39C  VAL*     4.2    17.4    -      -       +      +
     41C  LEU*     3.5    26.7    -      -       +      +
     63C  LEU*     3.9    15.5    -      -       -      +
     65C  LEU*     3.9    21.8    -      -       +      -
     84C  HIS*     5.3     1.4    -      -       -      -
     86C  SER*     4.2     2.4    +      -       -      -
    189C  ARG      3.1    11.8    +      -       -      +
    190C  GLU*     3.3    42.3    +      -       -      +
    192C  VAL*     1.3    79.0    -      -       -      +
    194C  THR*     1.3    61.2    +      -       +      +
    195C  GLY      3.5     0.2    +      -       -      -
    266C  THR*     5.2     5.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 194 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86C  SER*     3.9     7.1    +      -       -      +
     89C  GLN*     3.4    19.2    -      -       -      +
    190C  GLU      3.2    17.7    -      -       -      +
    191C  LEU      2.7    14.7    +      -       -      -
    193C  GLN*     1.3    78.3    -      -       +      +
    195C  GLY*     1.3    57.2    +      -       -      +
    196C  CYS*     3.3    19.9    -      -       -      -
    269C  THR*     4.3    14.4    -      -       +      -
    270C  LYS*     4.5    26.5    -      -       +      +
    273C  VAL*     4.1    13.7    -      -       +      +
----------------------------------------------------------
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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