Contacts of the helix formed by residues 165 - 191 (chain C) in PDB entry 1BRR


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with PRO 165 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163C  MET      4.8     0.4    -      -       -      +
    164C  ARG*     1.3    88.5    -      -       +      +
    166C  GLU*     1.3    57.9    +      -       +      +
    168C  ALA*     4.0     7.1    -      -       +      +
    169C  SER*     2.7    34.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 166 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    164C  ARG*     3.6    34.3    +      -       +      +
    165C  PRO*     1.3    81.0    -      -       +      +
    167C  VAL*     1.3    55.9    +      -       -      +
    169C  SER*     2.6    21.4    +      -       -      -
    170C  THR*     2.7    26.7    +      -       -      +
    226C  SER      5.2     3.9    -      -       -      +
    227C  ARG*     4.9     5.6    -      -       -      +
    228C  ALA*     3.5    30.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 167 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100C  LEU*     3.6    32.7    -      -       +      +
    101C  VAL*     5.0     2.0    -      -       -      -
    160C  ALA*     4.8     4.3    -      -       +      +
    163C  MET*     3.6    30.5    -      -       +      -
    164C  ARG*     3.1    30.0    +      -       +      +
    166C  GLU*     1.3    80.2    -      -       -      +
    168C  ALA*     1.3    64.9    +      -       -      +
    169C  SER      3.1     0.3    +      -       -      -
    170C  THR*     3.8     2.0    -      -       -      -
    171C  PHE*     2.9    26.7    +      -       +      +
    228C  ALA*     4.1    24.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 168 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160C  ALA*     3.4    33.5    +      -       -      +
    161C  GLU*     4.2    12.6    -      -       +      +
    162C  SER      5.2     0.2    -      -       -      +
    164C  ARG      2.8    19.7    +      -       -      +
    165C  PRO*     4.1     7.9    -      -       +      +
    167C  VAL*     1.3    73.6    -      -       -      +
    169C  SER*     1.3    58.5    +      -       -      +
    171C  PHE*     4.5     0.7    -      -       -      +
    172C  LYS*     3.3    34.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 169 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    165C  PRO      2.7    17.4    +      -       -      -
    166C  GLU*     2.6    23.6    +      -       -      -
    168C  ALA*     1.3    76.7    -      -       -      +
    170C  THR*     1.3    66.3    +      -       -      +
    171C  PHE      3.3     0.2    -      -       -      -
    172C  LYS*     3.4     7.2    +      -       -      +
    173C  VAL*     3.2    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 170 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100C  LEU*     4.0    11.4    -      -       +      -
    166C  GLU*     2.7    22.8    +      -       -      +
    167C  VAL      3.8     2.7    -      -       -      -
    169C  SER*     1.3    72.2    +      -       -      +
    171C  PHE*     1.3    65.0    +      -       -      +
    173C  VAL*     3.2     8.6    +      -       -      +
    174C  LEU*     3.2    38.5    +      -       +      +
    222C  ILE*     4.5     6.7    -      -       +      +
    223C  LEU*     4.1     8.5    -      -       +      -
    226C  SER*     2.8    40.9    +      -       -      +
    228C  ALA*     3.4    11.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 171 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97C  LEU*     4.3    23.3    -      -       +      -
    100C  LEU*     3.7    19.0    -      -       +      +
    101C  VAL*     3.5    21.1    -      -       +      -
    152C  LEU*     3.3    14.8    -      -       +      -
    156C  PHE*     3.2    51.1    -      +       +      -
    157C  THR*     3.5    15.9    -      -       -      -
    160C  ALA*     3.6    19.1    -      -       +      -
    167C  VAL      2.9    17.7    +      -       -      +
    170C  THR*     1.3    78.4    -      -       -      +
    172C  LYS*     1.3    63.7    +      -       +      +
    174C  LEU*     3.4     2.9    +      -       -      +
    175C  ARG*     2.8    49.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 172 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    157C  THR*     4.2     4.0    -      -       +      -
    160C  ALA*     6.0     0.7    -      -       +      -
    161C  GLU*     3.0    40.1    +      -       -      +
    168C  ALA*     3.3    19.9    +      -       -      +
    169C  SER*     3.4     7.5    +      -       -      +
    170C  THR      3.2     1.0    -      -       -      -
    171C  PHE*     1.3    81.1    -      -       +      +
    173C  VAL*     1.3    60.0    +      -       +      +
    175C  ARG*     3.2    34.6    +      -       -      +
    176C  ASN*     2.8    39.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 173 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169C  SER      3.2    13.6    +      -       -      +
    170C  THR*     3.2     9.3    +      -       -      +
    172C  LYS*     1.3    75.5    -      -       +      +
    174C  LEU*     1.3    65.4    +      -       -      +
    176C  ASN*     3.0    15.5    +      -       -      +
    177C  VAL*     2.9    23.9    +      -       +      +
    222C  ILE*     3.4    39.3    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
     97C  LEU*     3.9    28.3    -      -       +      -
    100C  LEU*     4.2     5.4    -      -       +      -
    170C  THR*     3.2    20.9    +      -       +      +
    171C  PHE      3.7     5.2    -      -       -      +
    173C  VAL*     1.3    73.7    -      -       -      +
    175C  ARG*     1.3    56.9    +      -       -      +
    177C  VAL*     2.7    27.1    +      -       +      +
    178C  THR*     2.7    18.3    +      -       -      +
    219C  PHE*     3.6    46.0    -      -       +      +
    222C  ILE*     3.9    20.4    -      -       +      -
    223C  LEU*     3.5    32.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 175 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97C  LEU*     5.4     2.2    -      -       -      +
    152C  LEU*     3.9    13.9    -      -       +      +
    153C  PHE*     3.2    41.1    -      -       +      -
    157C  THR*     2.9    38.0    +      -       -      +
    171C  PHE*     2.8    45.9    +      -       +      +
    172C  LYS*     3.3    33.9    +      -       -      +
    174C  LEU*     1.3    70.6    -      -       -      +
    176C  ASN*     1.3    82.9    +      -       -      +
    178C  THR*     3.3     7.1    +      -       -      -
    179C  VAL*     3.0    41.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 176 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153C  PHE*     5.0     1.0    -      -       -      -
    172C  LYS*     2.8    29.1    +      -       -      +
    173C  VAL*     3.0    12.9    +      -       -      +
    175C  ARG*     1.3   103.9    +      -       -      +
    177C  VAL*     1.3    64.4    +      -       +      +
    179C  VAL*     4.3     2.2    -      -       -      -
    180C  VAL*     2.9    35.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 177 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    173C  VAL*     2.9    17.6    +      -       +      +
    174C  LEU*     2.7    15.5    +      -       -      +
    176C  ASN*     1.3    73.5    -      -       +      +
    178C  THR*     1.3    60.2    +      -       +      +
    180C  VAL*     3.3     3.4    +      -       -      +
    181C  LEU*     2.9    52.2    +      -       +      +
    214C  SER      5.2     0.7    -      -       -      +
    215C  ALA*     5.2     2.5    -      -       -      -
    218C  GLY      5.8     0.4    -      -       -      -
    219C  PHE*     4.9    20.4    -      -       +      +
    222C  ILE*     3.7    26.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 178 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93C  LEU*     6.1     0.9    -      -       +      -
     97C  LEU*     4.1    10.9    -      -       +      +
    149C  LEU*     4.9     0.9    -      -       -      -
    152C  LEU*     4.3    14.5    -      -       -      +
    174C  LEU      2.7    22.5    +      -       -      +
    175C  ARG*     3.3    13.0    +      -       -      -
    177C  VAL*     1.3    67.4    -      -       +      +
    179C  VAL*     1.3    71.5    +      -       -      +
    180C  VAL      2.9     1.9    +      -       -      -
    181C  LEU*     5.0     0.7    -      -       -      -
    182C  TRP*     2.7    65.1    +      -       +      +
    215C  ALA*     6.0     0.7    -      -       -      +
    219C  PHE*     3.6    34.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 179 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149C  LEU*     4.2    35.6    -      -       +      +
    152C  LEU*     5.3     2.2    -      -       +      -
    153C  PHE*     4.6    23.3    -      -       +      +
    175C  ARG*     3.0    31.2    +      -       +      +
    176C  ASN*     4.3     3.8    -      -       -      +
    178C  THR*     1.3    84.8    +      -       -      +
    180C  VAL*     1.3    54.6    +      -       +      +
    183C  SER*     2.6    35.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 180 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    176C  ASN*     2.9    24.9    -      -       +      +
    177C  VAL*     3.3     3.5    +      -       -      +
    178C  THR      2.9     1.2    +      -       -      -
    179C  VAL*     1.3    84.1    -      -       +      +
    181C  LEU*     1.3    69.6    +      -       +      +
    183C  SER*     3.3    12.8    +      -       -      -
    184C  ALA*     3.9     6.8    +      -       -      +
   1000C  ARC      3.9    41.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 181 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177C  VAL*     2.9    31.4    +      -       +      +
    178C  THR*     4.3     0.9    -      -       -      +
    180C  VAL*     1.3    80.5    -      -       +      +
    182C  TRP*     1.3    66.3    +      -       +      +
    184C  ALA*     3.3    14.7    +      -       -      +
    185C  TYR*     3.2    18.8    -      -       +      -
    211C  LEU*     4.0    10.0    -      -       +      +
    214C  SER*     3.0    34.1    -      -       -      +
    215C  ALA*     3.3    34.1    -      -       +      +
   1000C  ARC      3.9    32.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 182 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90C  THR*     3.9    23.3    -      -       +      -
     93C  LEU*     4.1    14.4    -      -       +      +
     94C  LEU*     3.3    29.8    -      -       +      -
    115C  ASP*     3.8    16.4    -      -       -      -
    118C  MET*     4.0     7.9    -      -       +      -
    145C  MET*     3.5    11.7    -      -       +      +
    148C  ILE*     4.1    17.5    -      -       +      -
    149C  LEU*     4.4    22.0    -      -       +      -
    152C  LEU*     5.7     0.7    -      -       +      -
    178C  THR*     2.7    47.7    +      -       +      +
    181C  LEU*     1.3    73.4    -      -       -      +
    183C  SER*     1.3    58.6    +      -       -      +
    184C  ALA      2.9     5.9    +      -       -      -
    185C  TYR*     3.2    21.1    +      +       -      +
    186C  PRO*     3.4     8.1    -      -       -      +
    215C  ALA*     4.7    10.7    +      -       +      +
    999C  RET      3.6    49.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 183 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145C  MET*     3.9    14.2    -      -       -      +
    149C  LEU*     4.4    12.1    -      -       -      +
    179C  VAL*     2.6    26.5    +      -       -      +
    180C  VAL*     3.3    10.4    +      -       -      -
    182C  TRP*     1.3    77.9    -      -       -      +
    184C  ALA*     1.3    58.5    +      -       -      +
    185C  TYR      3.5     0.2    -      -       -      -
    186C  PRO*     3.5    10.2    -      -       -      +
    187C  VAL*     3.6    13.3    -      -       -      +
   1000C  ARC      3.8    18.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 184 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    180C  VAL      3.9     3.5    +      -       -      +
    181C  LEU*     3.3     6.5    +      -       -      +
    182C  TRP      2.9     1.6    +      -       -      -
    183C  SER*     1.3    78.8    +      -       -      +
    185C  TYR*     1.3    55.8    +      -       -      +
    186C  PRO      3.2     0.7    -      -       -      -
    187C  VAL*     2.7    31.9    +      -       +      +
    188C  VAL*     2.8    18.4    +      -       +      +
    211C  LEU*     3.5    25.4    -      -       +      -
   1000C  ARC      3.5    31.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 185 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86C  TRP*     3.5    24.5    -      +       -      -
    181C  LEU      3.2    31.6    -      -       -      -
    182C  TRP*     3.2    11.2    +      +       -      +
    184C  ALA*     1.3    76.1    -      -       -      +
    186C  PRO*     1.3    69.0    -      -       +      +
    188C  VAL*     3.8     1.7    -      -       -      +
    189C  TRP*     3.0    26.9    +      -       -      +
    208C  PHE*     3.6    31.6    -      +       -      -
    211C  LEU*     3.4    33.1    +      -       +      +
    212C  ASP*     2.8    21.2    +      -       -      -
    215C  ALA*     4.2     1.5    -      -       +      +
    999C  RET      3.2    66.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 186 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138C  TRP*     2.9    28.4    +      -       +      +
    142C  THR*     3.7    14.1    -      -       +      +
    145C  MET*     3.8    17.3    -      -       +      -
    182C  TRP      3.4    10.3    -      -       -      +
    183C  SER      3.5     9.9    -      -       -      +
    184C  ALA      3.5     2.9    -      -       -      -
    185C  TYR*     1.3    96.9    -      -       +      +
    187C  VAL*     1.3    57.7    +      -       +      +
    190C  LEU*     3.1    17.0    +      -       -      +
    999C  RET      3.4    44.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 187 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138C  TRP*     5.7     0.7    -      -       +      -
    183C  SER      3.6    19.7    -      -       -      +
    184C  ALA*     2.7    17.8    +      -       +      +
    186C  PRO*     1.3    73.2    -      -       +      +
    188C  VAL*     1.3    63.7    +      -       +      +
    190C  LEU*     3.4     6.6    +      -       +      +
    191C  ILE*     3.2    39.8    +      -       +      +
   1000C  ARC      4.3    25.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 188 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    184C  ALA*     2.8    23.7    +      -       +      +
    185C  TYR      3.8     0.9    -      -       -      +
    187C  VAL*     1.3    77.2    -      -       +      +
    189C  TRP*     1.3    51.0    +      -       -      +
    191C  ILE*     3.3    11.0    +      -       +      +
    192C  GLY*     2.7    35.9    +      -       -      -
    204C  GLU*     3.8    17.0    -      -       +      -
    207C  LEU*     3.8    35.4    -      -       +      -
    208C  PHE*     3.4    36.1    -      -       +      -
    211C  LEU*     4.1    14.4    -      -       +      -
   1000C  ARC      6.4     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 189 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83C  TYR*     2.8    30.4    +      -       -      -
     86C  TRP*     5.6     0.2    -      +       -      -
    122C  GLY*     4.5     4.8    +      -       -      -
    125C  GLY*     4.1     2.5    -      -       -      -
    126C  ALA*     4.1    22.8    -      -       -      +
    134C  ARG*     3.8    28.3    -      -       +      -
    135C  PHE*     4.8     8.3    -      +       -      -
    137C  TRP*     6.3     0.2    -      -       +      -
    138C  TRP*     3.5    31.4    -      +       +      -
    185C  TYR      3.0    18.1    +      -       -      +
    186C  PRO      4.2     2.7    -      -       -      +
    188C  VAL*     1.3    77.2    -      -       -      +
    190C  LEU*     1.3    66.0    +      -       -      +
    192C  GLY*     3.4     9.4    +      -       -      +
    194C  GLU*     3.1    38.7    +      -       +      -
    195C  GLY*     3.6    18.7    +      -       -      -
    204C  GLU*     5.1     3.6    -      -       -      -
    208C  PHE*     4.3    13.7    -      +       +      -
    999C  RET      4.0    31.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 190 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135C  PHE*     3.6    32.8    -      -       +      -
    138C  TRP*     3.8    35.2    -      -       +      +
    186C  PRO      3.1    19.5    +      -       -      +
    187C  VAL*     3.8     8.3    -      -       +      +
    188C  VAL      3.3     0.2    -      -       -      -
    189C  TRP*     1.3    83.2    -      -       -      +
    191C  ILE*     1.3    65.5    +      -       +      +
    196C  ALA*     3.1    29.3    +      -       +      +
    198C  ILE*     5.0     1.5    -      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    187C  VAL*     3.2    31.6    -      -       +      +
    188C  VAL*     3.3    13.5    -      -       +      +
    190C  LEU*     1.3    84.7    -      -       +      +
    192C  GLY*     1.3    59.7    +      -       -      +
    196C  ALA      3.3     9.8    -      -       -      +
    198C  ILE*     3.6    33.6    -      -       +      +
    199C  VAL*     3.1    46.1    +      -       +      -
    207C  LEU*     5.0    11.7    -      -       +      -
----------------------------------------------------------
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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