Contacts of the helix formed by residues 133 - 157 (chain C) in PDB entry 1O9R


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 133 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10C  LEU*     3.4    30.5    -      -       +      +
     14C  ALA*     5.3     0.2    -      -       +      -
     18C  VAL*     3.6    20.1    -      -       +      +
     72C  ARG*     3.0    23.4    +      -       -      -
     76C  LEU*     3.8     2.1    -      -       -      +
    128C  SER      3.1    18.3    +      -       -      +
    129C  ASP*     3.9     1.2    +      -       -      -
    131C  ALA      5.0     1.1    -      -       -      +
    132C  GLY*     1.3    79.8    -      -       -      +
    134C  PRO*     1.3    62.6    -      -       -      +
    135C  THR*     3.4     4.3    +      -       -      -
    136C  THR*     2.5    32.1    +      -       -      -
    137C  ALA*     3.0    17.7    +      -       -      +
    122E  ARG*     5.7     0.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with PRO 134 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129C  ASP*     3.9    21.5    -      -       -      +
    132C  GLY*     3.3    10.5    -      -       -      +
    133C  ASP*     1.3    89.5    -      -       -      +
    135C  THR*     1.3    57.9    +      -       -      +
    137C  ALA*     3.6     5.0    -      -       +      +
    138C  ASP*     2.9    28.2    +      -       -      +
    122E  ARG*     5.7     5.4    -      -       +      +
    125E  ILE*     3.9    27.8    -      -       +      -
    126E  ASP*     3.6    24.9    -      -       -      +
    141E  THR*     4.0     6.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 135 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72C  ARG*     3.4    34.5    -      -       -      +
    133C  ASP*     3.1     3.0    +      -       -      -
    134C  PRO*     1.3    78.5    -      -       -      +
    136C  THR*     1.4    62.3    +      -       -      +
    138C  ASP*     3.2    12.3    +      -       -      +
    139C  ILE*     3.3    14.1    +      -       +      +
    122E  ARG*     4.9     4.9    +      -       -      +
    125E  ILE*     3.5    14.9    -      -       -      +
    141E  THR*     4.2     8.0    -      -       -      +
    144E  SER*     2.8    29.8    +      -       -      +
    145E  ARG*     3.6    29.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 136 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18C  VAL*     3.4    23.4    -      -       +      +
     22C  LEU*     3.9    13.5    -      -       +      -
     72C  ARG*     2.8    26.6    +      -       +      +
    128C  SER*     3.5    13.5    -      -       -      +
    133C  ASP*     2.5    35.1    +      -       -      -
    135C  THR*     1.4    72.8    -      -       -      +
    137C  ALA*     1.3    66.3    +      -       -      +
    139C  ILE*     3.0    17.1    +      -       +      +
    140C  PHE*     3.1    24.9    +      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 137 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125C  ILE*     3.6    31.1    -      -       +      +
    128C  SER*     3.8     9.3    -      -       -      -
    129C  ASP*     3.9    15.3    -      -       +      +
    133C  ASP      3.0    15.4    +      -       -      +
    134C  PRO*     3.3    13.2    +      -       +      +
    136C  THR*     1.3    74.6    -      -       -      +
    138C  ASP*     1.3    57.5    -      -       -      +
    140C  PHE*     3.2     4.8    +      -       -      +
    141C  THR*     2.9    31.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 138 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  ASP*     4.1     3.5    -      -       -      +
    134C  PRO      2.9     7.7    +      -       -      +
    135C  THR      3.5     6.7    -      -       -      +
    136C  THR      3.1     0.4    -      -       -      -
    137C  ALA*     1.3    74.2    -      -       -      +
    139C  ILE*     1.3    64.2    +      -       -      +
    141C  THR*     3.5     7.5    -      -       -      -
    142C  ALA*     2.9    23.6    +      -       -      +
    138E  ASP*     4.1     1.7    -      -       -      +
    141E  THR*     3.4    30.0    -      -       +      +
    145E  ARG*     2.9    24.3    +      -       -      -
   1164E  TRS      2.6    50.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 139 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22C  LEU*     5.0     5.2    -      -       +      -
     65C  HIS*     4.7     3.2    +      -       -      +
     68C  THR*     3.6    26.2    -      -       +      +
     69C  ILE*     4.0    27.4    -      -       +      +
     72C  ARG*     3.7    41.1    -      -       +      +
     75C  GLN*     5.4     1.8    -      -       -      +
    135C  THR*     3.3    11.9    +      -       +      +
    136C  THR*     3.0     8.6    +      -       -      +
    138C  ASP*     1.3    79.0    -      -       -      +
    140C  PHE*     1.4    62.3    +      -       +      +
    142C  ALA*     3.4     3.4    +      -       -      +
    143C  ALA*     3.1    21.1    +      -       -      +
    145E  ARG*     3.6    35.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 140 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21C  ILE*     3.8    14.8    -      -       +      -
     22C  LEU*     3.6    23.8    -      -       +      -
     25C  SER*     3.6    25.1    -      -       -      -
     69C  ILE*     4.1    16.4    -      -       +      -
    121C  ILE*     3.2    26.3    -      -       +      +
    124C  ALA*     3.7    24.9    -      -       +      -
    125C  ILE*     3.7    18.2    -      -       +      +
    128C  SER*     3.4    28.0    -      -       -      -
    136C  THR*     3.1    32.4    +      -       +      -
    137C  ALA      3.6     5.8    -      -       -      +
    139C  ILE*     1.4    77.7    -      -       +      +
    141C  THR*     1.3    57.1    +      -       -      +
    143C  ALA*     3.3     2.1    +      -       +      -
    144C  SER*     2.8    25.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 141 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134A  PRO*     4.1    11.6    -      -       -      +
    135A  THR*     4.3     8.5    -      -       -      +
    138A  ASP*     3.4    40.8    -      -       +      +
    125C  ILE*     3.4    25.2    -      -       -      +
    137C  ALA      2.9    17.8    +      -       -      -
    138C  ASP*     3.1    11.5    +      -       -      -
    140C  PHE*     1.3    72.3    -      -       -      +
    142C  ALA*     1.3    61.8    +      -       -      +
    144C  SER*     3.2     2.8    +      -       -      -
    145C  ARG*     2.9    29.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 142 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65C  HIS*     3.5    18.5    -      -       +      +
    138C  ASP      2.9    15.3    +      -       -      +
    139C  ILE*     3.8     4.7    -      -       -      +
    141C  THR*     1.3    78.0    -      -       -      +
    143C  ALA*     1.4    61.1    +      -       -      +
    145C  ARG*     3.3    14.9    +      -       -      +
    146C  ASP*     3.4    11.3    +      -       -      +
    145E  ARG*     4.3    15.9    -      -       -      +
   1164E  TRS      4.4    18.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 143 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65C  HIS*     3.4    36.6    +      -       +      +
     69C  ILE*     5.1     6.1    -      -       +      -
    121C  ILE*     4.1    14.8    -      -       +      -
    139C  ILE      3.1    12.8    +      -       -      +
    140C  PHE*     3.6     9.2    -      -       -      +
    142C  ALA*     1.4    76.5    -      -       -      +
    144C  SER*     1.4    59.0    +      -       -      +
    146C  ASP*     3.2     3.8    +      -       -      +
    147C  LEU*     2.8    39.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 144 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135A  THR*     2.8    28.3    +      -       -      +
    118C  ALA      5.1     1.2    +      -       -      -
    121C  ILE*     3.7    13.2    -      -       -      +
    122C  ARG*     4.2    10.8    +      -       -      +
    125C  ILE*     3.8    11.3    -      -       -      +
    140C  PHE      2.8    17.9    +      -       -      -
    141C  THR      3.5     5.4    -      -       -      -
    143C  ALA*     1.4    74.3    -      -       -      +
    145C  ARG*     1.3    61.7    +      -       -      +
    147C  LEU*     4.4     4.5    -      -       -      -
    148C  ASP*     2.8    40.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 145 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  THR*     3.5    25.1    +      -       -      +
     75A  GLN*     4.6     3.3    -      -       -      +
    135A  THR*     3.6    26.5    -      -       +      +
    138A  ASP*     3.0    39.9    +      -       -      -
    139A  ILE*     3.5    27.6    -      -       +      +
    142A  ALA*     4.4     9.5    -      -       -      +
    141C  THR      2.9    13.1    +      -       -      +
    142C  ALA*     3.7     9.4    -      -       -      +
    143C  ALA      3.3     0.2    -      -       -      -
    144C  SER*     1.3    77.3    -      -       -      +
    146C  ASP*     1.3    65.7    +      -       -      +
    148C  ASP*     4.1     2.5    -      -       -      +
    149C  LYS*     3.1    24.3    +      -       -      +
   1164E  TRS      3.8    14.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 146 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61C  GLN*     3.7    32.3    +      -       +      +
     65C  HIS*     2.7    38.6    +      -       +      +
    142C  ALA      3.4     4.7    +      -       -      +
    143C  ALA      3.2     3.4    +      -       -      +
    145C  ARG*     1.3    80.7    -      -       -      +
    147C  LEU*     1.4    58.0    +      -       +      +
    149C  LYS*     3.3     9.1    +      -       -      +
    150C  SER*     2.8    34.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 147 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29C  VAL*     5.4     2.5    -      -       +      -
     32C  LEU*     4.1    16.8    -      -       +      -
     62C  LEU*     4.1    15.0    -      -       +      -
     65C  HIS*     6.0     3.4    -      -       +      -
    114C  TYR*     4.3    15.6    -      -       +      +
    117C  VAL*     4.0    24.7    -      -       +      +
    118C  ALA*     4.0    18.4    -      -       +      +
    121C  ILE*     3.5    36.8    -      -       +      -
    143C  ALA*     2.8    30.5    +      -       +      +
    144C  SER*     3.9     3.8    -      -       -      +
    146C  ASP*     1.4    72.6    -      -       +      +
    148C  ASP*     1.3    59.9    +      -       -      +
    150C  SER*     3.3     3.5    +      -       -      +
    151C  LEU*     2.8    30.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 148 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8A  ASN*     3.1    13.6    -      -       -      +
     72A  ARG*     2.7    34.6    +      -       -      +
     75A  GLN*     3.7     9.2    -      -       +      +
    118C  ALA*     3.6    11.1    -      -       -      +
    122C  ARG*     2.8    41.3    +      -       -      -
    144C  SER*     2.8    28.5    +      -       -      +
    145C  ARG*     4.1     2.0    -      -       -      +
    147C  LEU*     1.3    72.1    -      -       -      +
    149C  LYS*     1.3    57.8    +      -       -      +
    151C  LEU*     3.5     8.0    +      -       -      +
    152C  TRP*     3.1    26.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 149 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  GLU*     3.0    36.8    +      -       -      +
     75A  GLN*     3.9    16.7    +      -       -      +
   1163A   FE      4.3     3.0    -      -       -      -
    145C  ARG      3.1    18.6    +      -       -      +
    146C  ASP*     3.7     9.2    -      -       -      +
    148C  ASP*     1.3    73.2    -      -       -      +
    150C  SER*     1.3    61.3    +      -       -      +
    152C  TRP*     3.3    12.6    +      -       +      +
    153C  PHE*     2.9    59.3    +      -       +      -
----------------------------------------------------------
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Residues in contact with SER 150 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58C  PHE*     3.5    36.5    -      -       -      +
     61C  GLN*     3.5    10.6    +      -       -      -
    114C  TYR*     3.9    21.7    -      -       -      -
    146C  ASP      2.8    19.5    +      -       -      -
    147C  LEU*     3.3     5.4    +      -       -      -
    149C  LYS*     1.3    78.3    -      -       -      +
    151C  LEU*     1.3    57.4    +      -       -      +
    153C  PHE*     3.2     4.4    +      -       -      +
    154C  LEU*     3.0    33.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 151 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6A  THR*     4.0     6.1    -      -       -      +
      7A  LYS*     4.3     0.9    -      -       +      -
      8A  ASN*     3.7    37.0    -      -       +      +
    111C  ILE*     4.0    13.0    -      -       +      +
    114C  TYR*     4.2    10.2    -      -       +      -
    115C  GLY*     3.8    34.8    -      -       -      +
    118C  ALA*     4.4    11.0    -      -       +      -
    147C  LEU      2.8    18.6    +      -       -      +
    148C  ASP*     3.7     6.7    -      -       -      +
    150C  SER*     1.3    72.9    -      -       -      +
    152C  TRP*     1.3    60.2    +      -       -      +
    154C  LEU*     3.2     8.5    +      -       +      +
    155C  GLU*     2.8    55.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 152 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  GLU*     3.6    34.5    -      -       +      -
     74A  VAL*     3.3    40.0    -      -       +      +
     75A  GLN*     3.6    33.4    -      -       +      +
     41B  TRP*     3.7    14.2    +      -       -      -
     43B  LEU      5.3     0.2    +      -       -      -
     44B  LYS*     4.3    11.1    -      -       -      +
     48B  PHE*     3.9    18.5    -      +       -      -
     52B  HIS*     3.8    22.0    -      +       -      -
    148C  ASP      3.1    14.7    +      -       -      +
    149C  LYS*     3.6    10.1    -      -       +      +
    151C  LEU*     1.3    77.6    -      -       -      +
    153C  PHE*     1.4    76.5    +      +       -      +
    155C  GLU*     4.4     8.7    -      -       -      +
    156C  ALA*     2.7    49.2    +      -       +      +
    159C  GLN*     4.9     4.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 153 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48B  PHE*     3.5    19.6    -      +       +      -
     49B  ILE*     3.5    24.2    -      -       +      -
     52B  HIS*     3.8    24.2    -      +       -      -
     53B  GLU*     5.3     2.2    -      -       -      -
     54C  LEU*     3.9    21.1    -      -       +      -
     58C  PHE*     4.0    16.6    -      +       +      -
    149C  LYS*     2.9    42.5    +      -       +      +
    150C  SER      3.2     8.0    +      -       -      +
    152C  TRP*     1.4   111.8    -      +       -      +
    154C  LEU*     1.4    60.3    +      -       -      +
    156C  ALA*     3.6     5.9    +      -       -      +
    157C  HIS*     2.8    25.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 154 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51C  VAL*     5.9     1.3    -      -       +      -
     54C  LEU*     5.4     4.5    -      -       +      -
     55C  LEU*     4.5     6.3    -      -       +      -
     58C  PHE*     3.7    20.2    -      -       +      -
    107C  LEU*     3.8    24.7    -      -       +      +
    110C  LEU*     4.1    26.7    -      -       +      +
    111C  ILE*     3.6    21.8    -      -       +      +
    114C  TYR*     3.6    44.2    -      -       +      -
    150C  SER      3.0    18.6    +      -       -      +
    151C  LEU*     3.6     5.2    -      -       -      +
    153C  PHE*     1.4    75.9    -      -       -      +
    155C  GLU*     1.3    64.2    +      -       -      +
    157C  HIS*     3.1    23.6    +      -       -      +
    158C  VAL*     3.9     2.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 155 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5A  LYS      4.2     1.8    -      -       -      +
      6A  THR*     2.5    35.3    +      -       -      -
      7A  LYS*     2.8    38.1    +      -       -      +
     75A  GLN      5.3     0.5    -      -       -      +
    111C  ILE*     3.9    24.9    -      -       +      +
    151C  LEU*     2.8    34.5    +      -       +      +
    152C  TRP*     3.9     6.3    -      -       -      +
    154C  LEU*     1.3    72.7    -      -       -      +
    156C  ALA*     1.3    58.3    +      -       -      +
    158C  VAL*     2.9    21.2    +      -       +      +
    159C  GLN*     3.0    33.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 156 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43B  LEU      4.2     5.2    -      -       -      +
     44B  LYS*     3.4     5.0    -      -       +      -
     45B  GLY      2.8    26.1    +      -       -      -
     48B  PHE*     3.6    36.1    -      -       +      -
    152C  TRP*     2.7    33.5    +      -       +      +
    153C  PHE      3.9     1.8    -      -       -      +
    154C  LEU      3.2     0.2    -      -       -      -
    155C  GLU*     1.3    73.2    -      -       -      +
    157C  HIS*     1.3    58.0    +      -       -      +
    158C  VAL      3.4     0.5    +      -       -      -
    159C  GLN*     3.3    16.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 157 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45B  GLY*     3.2    23.1    -      -       -      -
     46B  PRO*     3.3    34.0    +      -       +      +
     47B  GLN      4.8     0.2    -      -       -      -
     48B  PHE*     3.8    21.2    +      +       +      +
     49B  ILE*     3.4    31.8    +      -       +      +
     47C  GLN*     5.7     0.2    -      -       +      -
     50C  ALA*     5.9     0.2    -      -       -      +
     51C  VAL*     4.2    18.9    -      -       +      +
     54C  LEU*     4.1    15.0    -      -       +      -
    107C  LEU*     3.8    25.1    -      -       +      +
    153C  PHE      2.8    25.4    +      -       -      -
    154C  LEU*     3.1    13.0    +      -       +      +
    155C  GLU      3.1     1.0    -      -       -      -
    156C  ALA*     1.3    77.3    -      -       -      +
    158C  VAL*     1.3    60.9    +      -       -      +
    159C  GLN      3.7     0.2    -      -       -      -
    160C  GLU      3.8     3.6    -      -       -      +
----------------------------------------------------------
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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