Contacts of the helix formed by residues 133 - 157 (chain A) 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 A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10A  LEU*     3.4    33.7    -      -       +      +
     18A  VAL*     3.6    19.4    -      -       +      +
     72A  ARG*     3.1    14.8    +      -       -      -
     76A  LEU*     3.9     1.6    -      -       -      +
    128A  SER      3.1    17.3    +      -       -      +
    129A  ASP*     4.2     1.4    +      -       -      -
    131A  ALA      4.8     1.1    -      -       -      -
    132A  GLY*     1.3    78.6    -      -       -      +
    134A  PRO*     1.3    62.0    -      -       -      +
    135A  THR*     3.4     4.2    +      -       -      -
    136A  THR*     2.5    39.4    +      -       -      -
    137A  ALA*     3.0    21.0    +      -       -      +
    122C  ARG*     5.7     0.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with PRO 134 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129A  ASP*     5.1     9.6    -      -       -      +
    132A  GLY*     3.3    10.1    -      -       -      +
    133A  ASP*     1.3    90.6    -      -       -      +
    135A  THR*     1.3    57.6    +      -       -      +
    137A  ALA*     3.7    10.3    -      -       +      +
    138A  ASP*     2.9    28.6    +      -       -      +
    122C  ARG*     5.8     5.2    -      -       +      +
    125C  ILE*     4.0    26.0    -      -       +      -
    126C  ASP*     3.6    24.0    -      -       -      +
    141C  THR*     4.1     5.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 135 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72A  ARG*     3.4    35.2    -      -       -      +
    133A  ASP*     3.2     2.9    +      -       -      -
    134A  PRO*     1.3    77.9    -      -       -      +
    136A  THR*     1.3    62.0    +      -       -      +
    138A  ASP*     3.2    12.8    +      -       -      +
    139A  ILE*     3.2    15.7    +      -       +      +
    122C  ARG*     4.8     4.9    +      -       -      +
    125C  ILE*     3.5    14.7    -      -       -      +
    141C  THR*     4.3     7.1    -      -       -      +
    144C  SER*     2.8    29.0    +      -       -      +
    145C  ARG*     3.6    28.6    -      -       +      +
    148C  ASP*     4.8     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 136 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  VAL*     3.4    23.6    -      -       +      +
     22A  LEU*     4.0    11.4    -      -       +      -
     72A  ARG*     2.8    25.7    +      -       +      +
    128A  SER*     3.4    15.0    -      -       -      +
    133A  ASP*     2.5    34.7    +      -       -      -
    135A  THR*     1.3    75.7    -      -       -      +
    137A  ALA*     1.3    63.5    +      -       -      +
    139A  ILE*     3.0    17.3    +      -       +      +
    140A  PHE*     3.1    24.7    +      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 137 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125A  ILE*     3.6    31.3    -      -       +      +
    128A  SER*     3.8    10.7    -      -       -      -
    129A  ASP*     4.0    11.0    -      -       +      +
    133A  ASP      3.0    16.2    +      -       -      +
    134A  PRO*     3.7     9.9    -      -       +      +
    136A  THR*     1.3    76.0    -      -       -      +
    138A  ASP*     1.3    57.5    +      -       -      +
    140A  PHE*     3.2     4.7    +      -       -      +
    141A  THR*     2.8    31.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 138 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134A  PRO      2.9     8.4    +      -       -      +
    135A  THR      3.4    10.1    -      -       -      +
    136A  THR      3.2     0.2    -      -       -      -
    137A  ALA*     1.3    74.6    -      -       -      +
    139A  ILE*     1.3    59.8    +      -       -      +
    141A  THR*     3.1     7.8    +      -       -      -
    142A  ALA*     2.9    29.1    +      -       -      +
    138C  ASP*     4.1     1.9    -      -       -      +
    141C  THR*     3.4    26.7    -      -       +      +
    145C  ARG*     3.0    23.6    +      -       -      -
    138E  ASP*     4.1     4.0    -      -       -      +
   1164E  TRS      2.6    47.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 139 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22A  LEU*     5.2     5.2    -      -       +      -
     65A  HIS*     4.7     3.1    +      -       -      +
     68A  THR*     3.6    28.3    -      -       +      +
     69A  ILE*     4.0    26.0    -      -       +      +
     72A  ARG*     3.8    40.6    -      -       +      +
     75A  GLN*     5.4     2.5    -      -       -      +
    135A  THR*     3.2    11.4    +      -       +      +
    136A  THR*     3.0     9.3    +      -       +      +
    138A  ASP*     1.3    77.1    -      -       -      +
    140A  PHE*     1.4    64.3    +      -       +      +
    142A  ALA*     3.5     3.2    +      -       -      +
    143A  ALA*     3.1    21.2    +      -       +      +
    145C  ARG*     3.5    37.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 140 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21A  ILE*     3.7    25.1    -      -       +      -
     22A  LEU*     3.6    22.2    -      -       +      -
     25A  SER*     3.5    27.8    -      -       -      -
     69A  ILE*     4.0    17.7    -      -       +      -
    121A  ILE*     3.3    26.5    -      -       +      +
    124A  ALA*     3.7    15.0    -      -       +      -
    125A  ILE*     3.7    17.7    -      -       +      +
    128A  SER*     3.4    27.6    -      -       -      -
    136A  THR*     3.1    31.7    +      -       +      -
    137A  ALA      3.7     6.1    -      -       -      +
    139A  ILE*     1.4    77.8    -      -       +      +
    141A  THR*     1.4    55.8    +      -       -      +
    143A  ALA*     3.3     1.9    +      -       -      -
    144A  SER*     2.8    26.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 141 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125A  ILE*     3.5    25.2    -      -       +      +
    137A  ALA      2.8    18.8    +      -       -      -
    138A  ASP*     3.1    10.6    +      -       -      -
    140A  PHE*     1.4    71.1    -      -       -      +
    142A  ALA*     1.3    67.2    +      -       -      +
    144A  SER*     3.2     1.7    +      -       -      -
    145A  ARG*     3.0    23.8    +      -       -      +
    134E  PRO*     4.0    11.5    -      -       -      +
    135E  THR*     4.1    10.5    -      -       -      +
    138E  ASP*     3.5    38.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 142 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65A  HIS*     3.6    18.2    +      -       +      -
    138A  ASP      2.9    16.6    +      -       -      +
    139A  ILE      3.8     4.0    -      -       -      +
    141A  THR*     1.3    78.3    -      -       -      +
    143A  ALA*     1.3    62.7    +      -       -      +
    145A  ARG*     3.3    15.4    +      -       -      +
    146A  ASP*     3.4    11.1    +      -       -      +
    145C  ARG*     4.4    14.8    -      -       -      +
   1164E  TRS      4.3    18.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 143 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29A  VAL*     6.5     0.2    -      -       +      -
     65A  HIS*     3.5    37.0    +      -       +      +
     69A  ILE*     5.0     9.2    -      -       +      -
    121A  ILE*     4.1    12.8    -      -       +      -
    139A  ILE      3.1    12.3    +      -       -      +
    140A  PHE*     3.6     9.2    -      -       -      +
    142A  ALA*     1.3    78.4    -      -       -      +
    144A  SER*     1.4    57.0    +      -       -      +
    146A  ASP*     3.2     3.3    +      -       -      +
    147A  LEU*     2.8    38.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 144 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118A  ALA      5.1     1.6    +      -       -      -
    121A  ILE*     3.7    12.0    -      -       -      +
    122A  ARG*     4.2    11.3    +      -       -      -
    125A  ILE*     3.8    10.9    -      -       -      +
    140A  PHE      2.8    16.9    +      -       -      -
    141A  THR      3.4     4.5    -      -       -      -
    143A  ALA*     1.4    75.2    -      -       -      +
    145A  ARG*     1.4    57.6    -      -       -      +
    147A  LEU*     4.4     4.5    -      -       -      +
    148A  ASP*     2.8    41.6    +      -       -      +
    135E  THR*     2.7    29.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 145 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141A  THR      3.0    16.4    +      -       -      +
    142A  ALA*     3.6    10.3    -      -       -      +
    143A  ALA      3.3     0.2    -      -       -      -
    144A  SER*     1.4    76.5    -      -       -      +
    146A  ASP*     1.3    66.1    +      -       -      +
    148A  ASP*     4.1     2.6    -      -       -      +
    149A  LYS*     3.1    24.9    +      -       -      +
     68E  THR*     3.6    25.5    +      -       -      +
     75E  GLN*     4.6     2.9    +      -       -      +
    135E  THR*     3.7    23.1    -      -       +      +
    138E  ASP*     2.9    41.6    +      -       -      -
    139E  ILE*     3.5    26.5    -      -       +      +
    142E  ALA*     4.4     9.9    -      -       -      +
   1164E  TRS      3.7    14.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 146 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61A  GLN*     3.8    31.2    +      -       +      +
     65A  HIS*     2.7    37.5    +      -       +      +
    142A  ALA      3.4     4.5    +      -       -      +
    143A  ALA      3.2     3.5    +      -       -      +
    145A  ARG*     1.3    82.3    -      -       -      +
    147A  LEU*     1.3    60.6    +      -       +      +
    149A  LYS*     3.9     9.2    -      -       -      +
    150A  SER*     2.9    34.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 147 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29A  VAL*     5.6     2.5    -      -       +      -
     32A  LEU*     4.2     9.6    -      -       +      -
     62A  LEU*     4.2    23.8    -      -       +      -
     65A  HIS*     6.1     2.5    -      -       +      -
    114A  TYR*     4.3    14.7    -      -       +      +
    117A  VAL*     4.0    25.1    -      -       +      +
    118A  ALA*     3.9    19.2    -      -       +      +
    121A  ILE*     3.5    37.0    -      -       +      -
    143A  ALA*     2.8    31.8    +      -       +      +
    144A  SER*     3.9     3.8    -      -       -      +
    146A  ASP*     1.3    73.3    -      -       +      +
    148A  ASP*     1.3    58.7    +      -       -      +
    150A  SER*     3.3     4.1    +      -       -      -
    151A  LEU*     2.9    30.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 148 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118A  ALA*     3.6    12.1    -      -       -      +
    122A  ARG*     2.8    40.5    +      -       -      -
    144A  SER*     2.8    27.3    +      -       -      +
    145A  ARG      4.1     1.1    -      -       -      +
    147A  LEU*     1.3    74.0    -      -       -      +
    149A  LYS*     1.3    62.1    +      -       -      +
    151A  LEU*     3.5     7.0    +      -       -      +
    152A  TRP*     3.1    22.7    +      -       -      +
      8E  ASN*     3.1    13.5    -      -       -      +
     72E  ARG*     2.8    34.6    +      -       -      +
     75E  GLN*     3.7     9.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 149 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145A  ARG      3.1    18.7    +      -       -      +
    146A  ASP*     3.9    10.3    -      -       -      +
    148A  ASP*     1.3    75.7    -      -       -      +
    150A  SER*     1.3    61.3    +      -       -      +
    152A  TRP*     3.3    14.2    +      -       +      +
    153A  PHE*     2.9    60.5    +      -       +      -
     71E  GLU*     2.9    37.3    +      -       -      +
     75E  GLN*     3.8    18.3    +      -       -      +
     52F  HIS*     5.8     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 150 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  PHE*     3.5    38.1    -      -       -      +
     61A  GLN*     3.5    13.9    +      -       -      -
    114A  TYR*     3.9    16.6    -      -       -      -
    146A  ASP      2.9    24.6    +      -       -      -
    147A  LEU*     3.8     5.3    -      -       -      -
    149A  LYS*     1.3    75.3    -      -       -      +
    151A  LEU*     1.3    66.4    +      -       -      +
    153A  PHE*     3.2     3.4    +      -       -      +
    154A  LEU*     3.0    28.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 151 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111A  ILE*     3.9    14.8    -      -       +      +
    114A  TYR*     4.2     9.8    -      -       +      -
    115A  GLY*     3.8    33.7    -      -       -      +
    118A  ALA*     4.5    11.0    -      -       +      -
    147A  LEU      2.9    17.3    +      -       -      +
    148A  ASP*     3.7     6.7    -      -       -      +
    150A  SER*     1.3    77.0    -      -       -      +
    152A  TRP*     1.3    56.7    +      -       -      +
    154A  LEU*     3.2     8.3    +      -       +      +
    155A  GLU*     2.8    55.6    +      -       +      +
      6E  THR*     4.1     5.8    -      -       -      +
      7E  LYS*     4.3     1.3    -      -       +      -
      8E  ASN*     3.7    36.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 152 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148A  ASP      3.1    14.2    +      -       -      +
    149A  LYS*     3.3     9.6    +      -       +      +
    151A  LEU*     1.3    76.3    -      -       -      +
    153A  PHE*     1.3    87.2    +      +       -      +
    155A  GLU*     3.2     8.7    +      -       -      +
    156A  ALA*     2.8    45.3    +      -       +      +
    159A  GLN*     4.9     7.9    -      -       -      -
     71E  GLU*     3.7    41.3    -      -       +      -
     74E  VAL*     3.2    30.6    -      -       +      +
     75E  GLN*     3.7    35.4    -      -       +      +
     41F  TRP*     3.6    22.8    +      -       -      -
     44F  LYS*     4.6     2.2    -      -       -      +
     48F  PHE*     4.0    17.4    -      +       -      -
     52F  HIS*     3.8    12.6    -      +       -      -
----------------------------------------------------------
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Residues in contact with PHE 153 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  LEU*     3.9    21.8    -      -       +      -
     58A  PHE*     3.9    16.8    -      +       +      -
    149A  LYS*     2.9    44.1    +      -       +      +
    150A  SER*     3.5     8.3    -      -       -      +
    152A  TRP*     1.3   107.8    -      +       -      +
    154A  LEU*     1.3    54.3    +      -       -      +
    156A  ALA      3.6     3.6    +      -       -      -
    157A  HIS*     2.7    32.2    +      -       -      -
     48F  PHE*     3.5    22.3    -      +       +      -
     49F  ILE*     3.7    23.3    -      -       +      -
     52F  HIS*     3.8    24.2    -      +       -      -
     53F  GLU*     5.4     1.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 154 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  VAL*     5.9     1.1    -      -       +      -
     54A  LEU*     5.3     5.2    -      -       +      -
     55A  LEU*     4.4     6.7    -      -       +      -
     58A  PHE*     3.9    17.9    -      -       +      -
    107A  LEU*     3.8    24.5    -      -       +      +
    110A  LEU*     4.1    27.8    -      -       +      +
    111A  ILE*     3.6    23.3    -      -       +      +
    114A  TYR*     3.6    45.5    -      -       +      -
    150A  SER      3.0    18.3    +      -       -      +
    151A  LEU*     3.6     6.1    -      -       -      +
    153A  PHE*     1.3    76.0    -      -       -      +
    155A  GLU*     1.3    63.1    +      -       -      +
    157A  HIS*     3.1    23.7    +      -       -      +
    158A  VAL*     3.9     1.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 155 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111A  ILE*     3.7    27.0    -      -       +      +
    151A  LEU*     2.8    34.2    +      -       +      +
    152A  TRP*     3.9     6.9    -      -       -      +
    154A  LEU*     1.3    74.5    -      -       -      +
    156A  ALA*     1.3    56.7    +      -       -      +
    157A  HIS      3.1     0.2    -      -       -      -
    158A  VAL*     2.9     8.3    +      -       +      +
    159A  GLN*     2.9    47.3    +      -       +      +
      5E  LYS      4.2     2.1    -      -       -      +
      6E  THR*     2.6    34.2    +      -       -      -
      7E  LYS*     2.8    36.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 156 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152A  TRP*     2.8    33.0    +      -       -      +
    153A  PHE      4.0     2.2    -      -       -      +
    154A  LEU      3.2     0.4    -      -       -      -
    155A  GLU*     1.3    71.8    -      -       -      +
    157A  HIS*     1.3    51.9    +      -       -      +
    158A  VAL      3.5     0.3    +      -       -      -
    159A  GLN*     3.3    14.9    +      -       -      +
     44F  LYS*     3.3    12.6    -      -       +      +
     45F  GLY      2.7    31.5    +      -       -      -
     48F  PHE*     3.6    36.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 157 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  GLN*     4.3     4.8    +      -       -      +
     51A  VAL*     4.1    20.4    -      -       +      +
     54A  LEU*     4.2    12.3    -      -       +      -
    107A  LEU*     3.8    21.9    -      -       +      +
    153A  PHE      2.7    26.7    +      -       -      -
    154A  LEU*     3.1    12.6    +      -       +      +
    155A  GLU      3.1     1.6    -      -       -      -
    156A  ALA*     1.3    77.8    -      -       -      +
    158A  VAL*     1.3    60.3    +      -       -      +
    160A  GLU      3.7     3.6    -      -       -      +
     45F  GLY      3.3    22.7    -      -       -      -
     46F  PRO*     3.3    30.5    -      -       -      +
     47F  GLN*     4.6     0.8    -      -       -      -
     48F  PHE*     3.7    12.1    +      +       +      +
     49F  ILE*     3.4    43.2    +      -       +      +
----------------------------------------------------------
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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