Contacts of the helix formed by residues 172 - 200 (chain C) in PDB entry 4QI1


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 ASP 172 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171C  ALA*     1.3    78.2    -      -       -      +
    173C  GLU*     1.3    64.4    +      -       -      +
    174C  ASP*     3.5    10.7    +      -       -      +
    175C  THR*     2.8    44.3    +      -       -      -
    176C  ARG*     3.0    19.1    +      -       -      +
    236C  ALA*     5.9     1.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 173 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172C  ASP*     1.3    74.4    -      -       -      +
    174C  ASP*     1.3    64.6    +      -       -      +
    176C  ARG*     3.4    32.1    +      -       +      +
    177C  SER*     3.0    26.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 174 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172C  ASP*     3.3    11.3    +      -       -      +
    173C  GLU*     1.3    79.3    -      -       -      +
    175C  THR*     1.3    58.9    +      -       -      +
    177C  SER*     3.5     5.6    +      -       -      -
    178C  THR*     3.0    34.9    +      -       -      +
    235C  ARG*     2.9    49.0    +      -       +      +
    236C  ALA*     4.0    17.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 175 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108C  LEU*     3.4    35.2    -      -       +      +
    168C  VAL*     3.8     6.1    -      -       +      -
    171C  ALA*     3.7    22.2    -      -       +      +
    172C  ASP*     2.8    29.5    +      -       -      -
    174C  ASP*     1.3    75.1    -      -       -      +
    176C  ARG*     1.3    58.9    +      -       -      +
    178C  THR*     3.5     1.0    +      -       -      -
    179C  PHE*     2.9    29.1    +      -       -      +
    236C  ALA*     3.7    23.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 176 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    168C  VAL*     3.4    36.3    -      -       +      +
    169C  SER*     3.9    16.9    +      -       -      +
    171C  ALA      2.9    31.2    +      -       -      +
    172C  ASP*     3.0    14.2    +      -       -      +
    173C  GLU*     3.5    42.2    -      -       +      +
    175C  THR*     1.3    75.6    -      -       -      +
    177C  SER*     1.3    56.4    +      -       -      +
    179C  PHE*     3.4     2.5    +      -       -      +
    180C  ASN*     3.0    41.1    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    173C  GLU*     3.0    21.9    +      -       -      -
    174C  ASP*     3.8     6.7    -      -       -      -
    176C  ARG*     1.3    75.4    -      -       -      +
    178C  THR*     1.3    64.1    +      -       -      +
    180C  ASN*     3.4     8.5    +      -       -      +
    181C  ALA*     3.1    21.3    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    108C  LEU*     3.7    17.7    -      -       +      -
    174C  ASP*     3.0    19.7    +      -       -      +
    175C  THR      4.0     2.7    -      -       -      -
    177C  SER*     1.3    73.5    +      -       -      +
    179C  PHE*     1.3    68.3    +      -       -      +
    181C  ALA*     3.2     5.8    +      -       -      +
    182C  LEU*     3.0    35.6    +      -       +      +
    230C  ILE*     4.6     9.0    -      -       +      +
    231C  LEU*     4.7     1.6    -      -       +      -
    234C  SER*     3.3    38.0    -      -       -      +
    235C  ARG      5.3     0.2    +      -       -      -
    236C  ALA*     3.9     5.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 179 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105C  ILE*     3.7    33.4    -      -       +      -
    108C  LEU*     3.6    12.9    -      -       +      +
    109C  ALA*     3.9    17.5    -      -       +      -
    160C  LEU*     3.9     9.2    -      -       +      -
    164C  PHE*     3.7    31.6    -      +       +      -
    165C  GLY*     3.8    22.0    -      -       -      -
    168C  VAL*     3.7    22.4    -      -       +      -
    175C  THR      2.9    20.7    +      -       -      +
    176C  ARG      3.6     2.9    -      -       -      +
    178C  THR*     1.3    78.0    -      -       -      +
    180C  ASN*     1.3    69.7    +      -       -      +
    182C  LEU*     3.2     2.5    +      -       -      -
    183C  ARG*     2.8    59.9    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    168C  VAL*     5.6     1.1    -      -       -      +
    176C  ARG*     3.0    27.6    +      -       -      +
    177C  SER*     3.9     7.2    -      -       -      +
    178C  THR      3.3     0.2    -      -       -      -
    179C  PHE*     1.3    83.3    -      -       -      +
    181C  ALA*     1.3    57.5    +      -       -      +
    183C  ARG*     2.3    42.4    +      -       -      +
    184C  ASN*     3.0    39.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 181 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177C  SER      3.1    14.2    +      -       -      +
    178C  THR*     3.5    10.1    -      -       -      +
    180C  ASN*     1.3    76.6    -      -       -      +
    182C  LEU*     1.3    57.3    +      -       -      +
    184C  ASN*     3.3     8.0    +      -       -      +
    185C  ILE*     3.0    33.3    +      -       +      +
    230C  ILE*     4.1    20.0    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    105C  ILE*     3.8    19.5    -      -       +      -
    108C  LEU*     3.7    20.4    -      -       +      -
    178C  THR*     3.0    18.1    +      -       +      +
    179C  PHE      3.8     0.4    -      -       -      +
    181C  ALA*     1.3    75.3    -      -       -      +
    183C  ARG*     1.3    65.4    +      -       -      +
    185C  ILE*     3.3     7.8    +      -       +      +
    186C  ILE*     3.0    26.2    +      -       -      +
    227C  PHE*     3.5    51.9    -      -       +      +
    230C  ILE*     3.6    24.0    -      -       +      -
    231C  LEU*     3.7    33.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 183 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105C  ILE*     3.7     8.5    -      -       +      +
    160C  LEU*     4.3    14.5    -      -       +      +
    161C  VAL*     4.1    29.7    -      -       +      +
    179C  PHE*     2.8    42.2    +      -       +      +
    180C  ASN*     2.3    41.8    +      -       -      +
    182C  LEU*     1.3    75.1    -      -       -      +
    184C  ASN*     1.3    88.4    +      -       -      +
    186C  ILE*     3.3     3.6    +      -       -      +
    187C  LEU*     2.8    42.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 184 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    180C  ASN*     3.0    26.4    +      -       -      +
    181C  ALA*     3.7     6.9    -      -       -      +
    182C  LEU      3.2     0.2    -      -       -      -
    183C  ARG*     1.3   109.0    +      -       -      +
    185C  ILE*     1.3    64.6    +      -       -      +
    187C  LEU*     3.8    11.9    -      -       -      +
    188C  VAL*     3.0    33.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 185 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181C  ALA*     3.0    20.8    +      -       +      +
    182C  LEU*     3.3    12.3    +      -       +      +
    184C  ASN*     1.3    72.8    -      -       -      +
    186C  ILE*     1.3    59.7    +      -       +      +
    188C  VAL*     5.1     0.7    -      -       -      -
    189C  THR*     2.8    55.1    +      -       +      +
    190C  TRP*     6.2     0.2    -      -       -      +
    222C  VAL*     4.2    22.4    -      -       +      +
    223C  ALA*     4.6     3.1    -      -       -      -
    226C  GLY      4.5     1.6    -      -       -      +
    227C  PHE*     4.2    28.7    -      -       +      +
    230C  ILE*     4.0    28.9    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    101C  LEU*     5.0     3.8    -      -       +      +
    102C  LEU*     4.7     9.9    -      -       +      -
    105C  ILE*     4.1    25.1    -      -       +      -
    156C  LEU*     5.3     0.7    -      -       +      -
    157C  LEU*     3.8     9.9    -      -       +      -
    160C  LEU*     3.6    28.5    -      -       +      -
    182C  LEU      3.0    13.9    +      -       -      +
    183C  ARG      3.6     6.3    -      -       -      +
    185C  ILE*     1.3    72.9    -      -       -      +
    187C  LEU*     1.3    58.9    +      -       -      +
    190C  TRP*     2.8    78.7    +      -       +      +
    227C  PHE*     3.9    26.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 187 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    157C  LEU*     4.0    37.7    -      -       +      +
    160C  LEU*     5.0     3.1    -      -       +      -
    161C  VAL*     4.0    30.5    -      -       +      -
    183C  ARG*     2.8    31.0    +      -       +      +
    184C  ASN*     3.8    21.3    -      -       -      +
    186C  ILE*     1.3    73.4    -      -       -      +
    188C  VAL*     1.3    64.7    +      -       +      +
    191C  ALA*     3.2    23.4    +      -       -      +
----------------------------------------------------------
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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  ASN*     3.0    24.1    +      -       +      +
    185C  ILE*     4.3     1.3    -      -       -      +
    187C  LEU*     1.3    81.0    -      -       +      +
    189C  THR*     1.3    73.0    +      -       +      +
    191C  ALA*     3.7     5.3    +      -       -      +
    192C  ILE*     3.2    28.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 189 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185C  ILE*     2.8    30.0    +      -       +      +
    188C  VAL*     1.3    83.7    -      -       +      +
    190C  TRP*     1.4    88.5    +      -       -      +
    192C  ILE*     3.1    17.3    +      -       +      +
    193C  TYR*     3.3    15.2    -      -       -      -
    219C  LEU*     3.7    12.1    -      -       +      +
    222C  VAL*     3.6    41.7    -      -       +      -
    223C  ALA*     3.9    11.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 190 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98C  THR*     3.7    22.0    -      -       -      -
    101C  LEU*     4.1    22.6    -      -       +      +
    102C  LEU*     3.9    18.8    -      -       +      -
    123C  ASP*     3.5    19.3    -      -       -      -
    126C  MET*     4.4     3.4    -      -       +      -
    153C  MET*     3.6     7.8    -      -       +      +
    156C  LEU*     4.0    26.2    -      -       +      -
    157C  LEU*     4.3     8.3    -      -       +      -
    186C  ILE*     2.8    48.0    +      -       +      +
    189C  THR*     1.4    93.7    +      -       -      +
    191C  ALA*     1.3    63.2    +      -       -      +
    193C  TYR*     3.0    23.5    +      +       -      +
    194C  PRO*     3.4     9.2    -      -       -      +
    223C  ALA*     4.3     6.6    +      -       +      +
    301C  RET      3.3    50.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 191 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153C  MET*     3.9    18.8    -      -       +      +
    157C  LEU*     4.7     6.8    -      -       +      +
    187C  LEU      3.2    21.1    +      -       -      +
    188C  VAL*     3.9     4.9    -      -       -      +
    189C  THR      3.2     0.8    -      -       -      -
    190C  TRP*     1.3    80.0    -      -       -      +
    192C  ILE*     1.3    60.8    +      -       +      +
    194C  PRO*     3.2    16.9    -      -       -      +
    195C  VAL*     4.0     9.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 192 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    188C  VAL*     3.2    31.0    -      -       +      +
    189C  THR*     3.5     8.3    -      -       -      +
    190C  TRP      3.1     0.8    -      -       -      -
    191C  ALA*     1.3    77.7    -      -       +      +
    193C  TYR*     1.4    67.3    +      -       -      +
    194C  PRO      3.3     0.4    -      -       -      -
    195C  VAL*     3.1    15.5    +      -       +      +
    196C  ALA*     2.9    22.1    +      -       +      +
    215C  LEU*     4.5    13.7    -      -       +      -
    219C  LEU*     3.8    29.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 193 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94C  TRP*     3.5    14.1    -      +       -      -
    189C  THR*     3.3    28.3    -      -       -      -
    190C  TRP*     3.0    18.0    +      +       -      +
    192C  ILE*     1.4    74.6    -      -       -      +
    194C  PRO*     1.3    65.1    -      -       +      +
    196C  ALA*     3.2     8.1    +      -       -      +
    197C  TRP*     2.9    28.1    +      -       -      +
    216C  PHE*     3.7    25.7    -      +       -      -
    219C  LEU*     3.3    23.1    +      -       +      -
    220C  ASP*     2.7    42.1    +      -       -      -
    223C  ALA*     4.0     2.5    -      -       +      +
    301C  RET      3.3    66.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 194 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146C  TRP*     2.9    31.5    +      -       +      +
    150C  THR*     3.5    26.0    -      -       +      +
    153C  MET*     3.6    26.9    -      -       +      -
    190C  TRP      3.4     8.5    -      -       -      +
    191C  ALA      3.2    18.4    -      -       -      +
    193C  TYR*     1.3    92.3    -      -       +      +
    195C  VAL*     1.3    56.2    +      -       +      +
    197C  TRP*     3.5     2.3    +      -       +      -
    198C  LEU*     3.1    18.2    +      -       -      +
    301C  RET      3.7    17.5    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    146C  TRP*     5.4     1.3    -      -       +      -
    191C  ALA      4.0    14.8    -      -       -      +
    192C  ILE*     3.1    15.2    +      -       +      +
    194C  PRO*     1.3    76.7    -      -       +      +
    196C  ALA*     1.3    60.8    +      -       -      +
    198C  LEU*     3.4     8.5    +      -       +      +
    199C  VAL*     2.9    42.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 196 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    192C  ILE*     2.9    12.9    +      -       -      +
    193C  TYR*     3.2    10.1    +      -       -      +
    195C  VAL*     1.3    78.2    -      -       -      +
    197C  TRP*     1.3    56.6    +      -       -      +
    199C  VAL*     3.6     4.7    -      -       -      +
    200C  GLY*     3.0    28.4    +      -       -      -
    212C  GLU*     4.7     7.0    -      -       +      +
    215C  LEU*     3.4    38.5    -      -       +      +
    216C  PHE*     4.1    20.0    -      -       +      -
    219C  LEU*     4.5     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 197 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91C  TYR*     3.6    17.0    -      -       -      -
    130C  GLY      4.5     0.6    +      -       -      -
    133C  ALA*     3.7    28.3    -      -       +      -
    134C  THR*     2.8    19.4    +      -       -      -
    142C  ARG*     3.8    26.9    -      -       +      -
    143C  TYR*     4.2    12.8    -      +       -      -
    146C  TRP*     3.1    33.9    -      +       +      -
    193C  TYR      2.9    17.0    +      -       -      +
    194C  PRO      3.6     6.7    -      -       -      +
    196C  ALA*     1.3    74.5    -      -       -      +
    198C  LEU*     1.3    65.6    +      -       -      +
    199C  VAL      3.4     0.2    +      -       -      -
    200C  GLY      3.5     5.9    +      -       -      +
    202C  GLU*     3.4    44.0    -      -       +      +
    203C  GLY*     3.4    32.0    +      -       -      -
    212C  GLU*     6.1     0.4    -      -       -      -
    216C  PHE*     4.1    11.3    -      +       +      -
    301C  RET      3.8    26.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 198 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143C  TYR*     3.8    23.6    -      -       +      -
    146C  TRP*     3.8    35.9    -      -       +      +
    194C  PRO      3.1    15.5    +      -       -      +
    195C  VAL*     3.7     8.7    -      -       +      +
    197C  TRP*     1.3    82.2    -      -       +      +
    199C  VAL*     1.3    61.3    +      -       +      +
    203C  GLY*     4.3     0.7    -      -       -      -
    204C  LEU*     2.6    66.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 199 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    195C  VAL*     2.9    29.4    +      -       +      +
    196C  ALA*     3.6    14.4    -      -       -      +
    198C  LEU*     1.3    78.2    -      -       +      +
    200C  GLY*     1.3    65.7    +      -       -      +
    204C  LEU*     6.0     1.1    -      -       +      -
    206C  LEU*     2.6    55.0    +      -       +      -
    207C  THR*     3.1    18.8    +      -       +      -
    215C  LEU*     4.8     9.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 200 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    196C  ALA      3.0    17.2    +      -       -      -
    197C  TRP*     3.5     2.7    +      -       -      -
    198C  LEU      3.4     0.6    -      -       -      -
    199C  VAL*     1.3    78.6    -      -       -      +
    201C  THR*     1.3    63.9    +      -       -      -
    202C  GLU      3.3     3.1    -      -       -      -
    203C  GLY      3.2     8.0    +      -       -      -
    204C  LEU      3.6     0.2    +      -       -      -
    205C  ALA*     2.9    23.1    +      -       -      -
    207C  THR*     3.9    17.0    -      -       -      -
    212C  GLU*     4.1    11.0    -      -       -      -
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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