Contacts of the helix formed by residues 133 - 157 (chain D) 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 D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10D  LEU*     3.4    33.4    -      -       +      +
     14D  ALA*     5.6     0.2    -      -       +      -
     18D  VAL*     3.6    19.1    -      -       +      +
     72D  ARG*     3.0    14.7    +      -       -      -
     76D  LEU*     3.8     2.1    -      -       -      +
    128D  SER      3.1    18.0    +      -       -      +
    129D  ASP*     3.8     1.4    +      -       -      -
    131D  ALA      5.0     0.7    -      -       -      -
    132D  GLY*     1.3    78.6    -      -       -      +
    134D  PRO*     1.3    58.8    -      -       -      +
    135D  THR*     3.4     4.2    +      -       -      -
    136D  THR*     2.5    41.2    +      -       -      -
    137D  ALA*     3.0    22.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 134 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129D  ASP*     3.6    23.3    -      -       -      +
    132D  GLY*     3.3    11.0    -      -       -      +
    133D  ASP*     1.3    89.9    -      -       -      +
    135D  THR*     1.3    60.1    +      -       -      +
    137D  ALA*     3.6     6.1    -      -       +      +
    138D  ASP*     2.9    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 135 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72D  ARG*     3.5    34.1    -      -       -      +
    133D  ASP*     3.1     3.0    +      -       -      -
    134D  PRO*     1.3    78.8    -      -       -      +
    136D  THR*     1.4    65.3    +      -       -      +
    138D  ASP*     3.2    16.2    +      -       -      +
    139D  ILE*     3.3    18.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 136 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18D  VAL*     3.3    25.0    -      -       +      +
     22D  LEU*     3.9    13.0    -      -       +      -
     72D  ARG*     2.8    25.5    +      -       +      +
     76D  LEU*     4.1     0.2    -      -       -      +
    128D  SER*     3.6    13.2    -      -       -      +
    133D  ASP*     2.5    35.2    +      -       -      -
    135D  THR*     1.4    72.5    -      -       -      +
    137D  ALA*     1.3    66.6    +      -       -      +
    139D  ILE*     3.0    17.7    +      -       +      +
    140D  PHE*     3.1    25.3    +      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 137 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125D  ILE*     3.6    29.1    -      -       +      +
    128D  SER*     3.9     7.5    -      -       -      -
    129D  ASP*     3.9    15.3    -      -       +      +
    133D  ASP      3.0    14.4    +      -       -      +
    134D  PRO*     3.3    13.2    +      -       +      +
    136D  THR*     1.3    76.2    -      -       -      +
    138D  ASP*     1.3    57.2    +      -       -      +
    140D  PHE*     3.2     7.4    +      -       -      +
    141D  THR*     2.8    31.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 138 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138B  ASP*     4.1     3.3    -      -       -      +
   1164B  TRS      2.6    50.0    +      -       -      -
    134D  PRO      2.9    13.2    +      -       -      +
    135D  THR*     3.4    12.1    -      -       -      +
    136D  THR      3.1     0.4    -      -       -      -
    137D  ALA*     1.3    75.3    -      -       -      +
    139D  ILE*     1.3    67.3    +      -       -      +
    141D  THR*     3.1     7.1    +      -       -      -
    142D  ALA*     2.9    24.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 139 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22D  LEU*     5.1     4.5    -      -       +      -
     65D  HIS*     4.7     3.0    +      -       -      +
     68D  THR*     3.6    34.3    -      -       +      +
     69D  ILE*     4.0    27.6    -      -       +      +
     72D  ARG*     3.8    41.3    -      -       +      +
     75D  GLN*     5.5     1.6    -      -       -      +
    135D  THR*     3.3    16.3    +      -       +      +
    136D  THR*     3.0     8.4    +      -       +      +
    138D  ASP*     1.3    80.2    -      -       +      +
    140D  PHE*     1.4    63.2    +      -       +      +
    142D  ALA*     3.4     6.5    +      -       -      +
    143D  ALA*     3.1    20.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 140 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21D  ILE*     3.8    13.5    -      -       +      -
     22D  LEU*     3.5    25.4    -      -       +      -
     25D  SER*     3.6    26.0    -      -       -      -
     69D  ILE*     4.1    16.2    -      -       +      -
    121D  ILE*     3.3    25.8    -      -       +      +
    124D  ALA*     3.7    24.9    -      -       +      -
    125D  ILE*     3.6    19.7    -      -       +      +
    128D  SER*     3.3    28.7    -      -       -      -
    136D  THR*     3.1    32.2    +      -       +      -
    137D  ALA      3.6     3.4    -      -       -      +
    139D  ILE*     1.4    76.0    -      -       +      +
    141D  THR*     1.3    52.7    +      -       -      +
    143D  ALA*     3.3     3.0    +      -       -      -
    144D  SER*     2.8    30.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 141 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134B  PRO*     4.0    12.3    -      -       +      +
    135B  THR*     4.3     9.2    -      -       -      +
    138B  ASP*     3.4    40.6    -      -       +      +
    125D  ILE*     3.5    25.7    -      -       -      +
    137D  ALA      2.8    18.7    +      -       -      -
    138D  ASP*     3.1    10.8    +      -       -      +
    140D  PHE*     1.3    73.3    -      -       -      +
    142D  ALA*     1.3    60.9    +      -       -      +
    144D  SER*     3.2     2.4    +      -       -      -
    145D  ARG*     2.9    30.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 142 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1164B  TRS      4.4    22.6    +      -       -      +
     65D  HIS*     3.5    19.4    +      -       +      +
    138D  ASP*     2.9    16.3    +      -       -      +
    139D  ILE*     3.8     6.5    -      -       -      +
    141D  THR*     1.3    79.6    -      -       -      +
    143D  ALA*     1.3    60.8    +      -       -      +
    145D  ARG*     3.3    15.8    +      -       -      +
    146D  ASP*     3.4    11.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 143 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29D  VAL*     6.6     0.2    -      -       +      -
     65D  HIS*     3.5    35.9    -      -       +      +
     69D  ILE*     5.0     5.8    -      -       +      -
    121D  ILE*     4.0    15.7    -      -       +      -
    139D  ILE*     3.1    13.5    +      -       +      +
    140D  PHE*     3.6     9.2    -      -       -      +
    142D  ALA*     1.3    75.3    -      -       -      +
    144D  SER*     1.3    58.2    +      -       -      +
    146D  ASP*     3.2     4.3    +      -       -      +
    147D  LEU*     2.8    37.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 144 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135B  THR*     2.7    28.4    +      -       -      +
    118D  ALA      5.1     1.6    +      -       -      -
    121D  ILE*     3.7    13.9    -      -       -      +
    122D  ARG*     4.2    10.8    +      -       -      +
    125D  ILE*     3.9    10.9    -      -       -      +
    140D  PHE      2.8    20.2    +      -       -      -
    141D  THR      3.2     5.8    +      -       -      -
    143D  ALA*     1.3    72.2    -      -       -      +
    145D  ARG*     1.3    64.9    +      -       -      +
    147D  LEU*     4.3     5.2    -      -       -      -
    148D  ASP*     2.8    34.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 145 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68B  THR*     3.6    25.5    +      -       -      +
     75B  GLN*     4.6     3.0    +      -       -      +
    135B  THR*     3.6    22.7    -      -       +      +
    138B  ASP*     2.9    41.5    +      -       -      -
    139B  ILE*     3.6    25.7    -      -       +      +
    142B  ALA*     4.4     9.5    -      -       -      +
   1164B  TRS      3.8    14.3    +      -       -      -
    141D  THR      2.9    16.4    +      -       -      +
    142D  ALA*     3.5     9.9    -      -       -      +
    143D  ALA      3.2     0.2    -      -       -      -
    144D  SER*     1.3    77.8    -      -       -      +
    146D  ASP*     1.3    66.3    +      -       -      +
    148D  ASP*     4.1     1.9    -      -       -      +
    149D  LYS*     3.1    24.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 146 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61D  GLN*     3.7    31.9    +      -       +      +
     65D  HIS*     2.8    38.1    +      -       +      +
    142D  ALA      3.4     3.7    +      -       -      +
    143D  ALA      3.2     3.7    +      -       -      +
    145D  ARG*     1.3    79.8    -      -       -      +
    147D  LEU*     1.4    63.0    +      -       +      +
    149D  LYS*     3.4     8.0    +      -       -      +
    150D  SER*     2.9    34.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 147 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29D  VAL*     5.6     2.5    -      -       +      -
     32D  LEU*     4.1    16.8    -      -       +      -
     62D  LEU*     4.2    15.9    -      -       +      -
     65D  HIS*     6.0     2.9    -      -       +      -
    114D  TYR*     4.3    14.1    -      -       +      +
    117D  VAL*     3.9    23.6    -      -       +      -
    118D  ALA*     4.0    20.4    -      -       +      +
    121D  ILE*     3.5    38.4    -      -       +      -
    143D  ALA*     2.8    30.1    +      -       +      +
    144D  SER*     4.0     3.4    -      -       -      +
    146D  ASP*     1.4    74.0    -      -       +      +
    148D  ASP*     1.4    57.8    +      -       -      +
    150D  SER*     3.3     4.3    +      -       -      -
    151D  LEU*     2.9    30.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 148 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8B  ASN*     3.1    15.2    -      -       -      +
     72B  ARG*     2.7    34.0    +      -       -      +
     75B  GLN*     3.7    10.0    -      -       +      +
    135B  THR*     4.3     0.2    -      -       -      +
    118D  ALA*     3.5    11.4    -      -       -      +
    122D  ARG*     2.8    40.9    +      -       -      -
    144D  SER*     2.8    28.5    +      -       -      +
    145D  ARG      4.2     0.9    -      -       -      +
    147D  LEU*     1.4    73.2    -      -       -      +
    149D  LYS*     1.3    62.9    +      -       -      +
    151D  LEU*     3.5     7.4    +      -       -      +
    152D  TRP*     3.1    22.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 149 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71B  GLU*     3.0    38.0    +      -       -      +
     75B  GLN*     3.9    16.9    +      -       -      +
   1163B   FE      4.1     3.6    -      -       -      -
    145D  ARG      3.1    19.0    +      -       -      +
    146D  ASP*     3.7    10.3    -      -       -      +
    148D  ASP*     1.3    78.1    -      -       -      +
    150D  SER*     1.3    58.4    +      -       -      +
    152D  TRP*     3.2    13.5    +      -       +      +
    153D  PHE*     2.9    59.7    +      -       +      -
----------------------------------------------------------
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Residues in contact with SER 150 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58D  PHE*     3.4    38.0    -      -       -      +
     61D  GLN*     3.5    10.9    +      -       -      -
    114D  TYR*     3.9    21.4    -      -       -      -
    146D  ASP      2.9    24.3    +      -       -      -
    147D  LEU*     3.7     4.7    -      -       -      -
    149D  LYS*     1.3    75.1    -      -       -      +
    151D  LEU*     1.3    64.1    +      -       -      +
    153D  PHE*     3.2     3.7    +      -       -      +
    154D  LEU*     3.0    29.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 151 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6B  THR*     4.1     2.9    -      -       -      +
      7B  LYS*     4.4     0.7    -      -       +      -
      8B  ASN*     3.7    39.7    -      -       +      +
    111D  ILE*     4.0    13.0    -      -       +      +
    114D  TYR*     4.3    10.5    -      -       +      -
    115D  GLY*     3.9    33.0    -      -       -      +
    118D  ALA*     4.4    11.4    -      -       +      -
    147D  LEU      2.9    17.5    +      -       -      +
    148D  ASP*     3.7     6.7    -      -       -      +
    150D  SER*     1.3    76.3    -      -       -      +
    152D  TRP*     1.3    56.4    +      -       -      +
    154D  LEU*     3.2     8.8    +      -       +      +
    155D  GLU*     2.8    58.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 152 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41A  TRP*     3.7    21.2    +      -       -      -
     43A  LEU      5.2     0.2    +      -       -      -
     44A  LYS*     4.3     4.6    -      -       -      +
     48A  PHE*     3.9    18.4    -      +       -      -
     52A  HIS*     3.7    22.7    -      +       -      -
     71B  GLU*     3.6    39.5    -      -       +      -
     74B  VAL*     3.1    32.6    -      -       +      +
     75B  GLN*     3.6    35.4    -      -       +      +
    148D  ASP      3.1    14.6    +      -       -      +
    149D  LYS*     3.2    11.0    +      -       +      +
    151D  LEU*     1.3    77.2    -      -       -      +
    153D  PHE*     1.3    75.2    +      +       -      +
    155D  GLU*     3.2     8.6    +      -       -      +
    156D  ALA*     2.7    49.5    +      -       +      +
    159D  GLN*     4.9     3.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 153 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  PHE*     3.5    20.5    -      +       +      -
     49A  ILE*     3.6    16.4    -      -       +      -
     52A  HIS*     3.8    23.8    -      +       -      -
     53A  GLU*     5.2     2.2    -      -       -      -
     54D  LEU*     3.8    27.8    -      -       +      -
     58D  PHE*     4.0    16.2    -      +       +      -
    149D  LYS*     2.9    37.8    +      -       +      +
    150D  SER      3.2     7.4    +      -       -      +
    152D  TRP*     1.3   113.9    -      +       -      +
    154D  LEU*     1.3    61.9    +      -       -      +
    156D  ALA*     3.6     5.4    +      -       -      +
    157D  HIS*     2.8    25.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 154 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51D  VAL*     5.9     1.1    -      -       +      -
     54D  LEU*     5.3     4.5    -      -       +      -
     55D  LEU*     4.4     5.4    -      -       +      -
     58D  PHE*     3.8    19.7    -      -       +      -
    107D  LEU*     3.8    23.3    -      -       +      +
    110D  LEU*     4.0    28.9    -      -       +      +
    111D  ILE*     3.6    23.1    -      -       +      +
    114D  TYR*     3.7    44.4    -      -       +      -
    150D  SER      3.0    17.6    +      -       -      +
    151D  LEU*     3.6     6.3    -      -       -      +
    153D  PHE*     1.3    76.7    -      -       -      +
    155D  GLU*     1.4    63.0    +      -       -      +
    157D  HIS*     3.1    23.4    +      -       +      +
    158D  VAL*     3.9     1.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 155 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5B  LYS      4.3     2.0    -      -       -      +
      6B  THR*     2.6    32.7    +      -       -      -
      7B  LYS*     2.7    38.6    +      -       -      +
     75B  GLN      5.2     0.7    -      -       -      +
    111D  ILE*     3.9    26.1    -      -       +      +
    151D  LEU*     2.8    37.9    +      -       +      +
    152D  TRP*     4.0     6.0    -      -       -      +
    154D  LEU*     1.4    68.0    -      -       -      +
    156D  ALA*     1.3    67.7    +      -       -      +
    158D  VAL*     2.9    17.1    +      -       +      +
    159D  GLN*     3.0    32.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 156 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43A  LEU      4.1     5.8    -      -       -      +
     44A  LYS*     3.4     5.2    -      -       +      +
     45A  GLY      2.8    26.0    +      -       -      -
     48A  PHE*     3.6    34.7    -      -       +      +
    152D  TRP*     2.7    33.2    +      -       +      +
    153D  PHE      3.9     2.5    -      -       -      +
    154D  LEU      3.2     0.2    -      -       -      -
    155D  GLU*     1.3    73.3    -      -       -      +
    157D  HIS*     1.3    56.0    +      -       -      +
    158D  VAL      3.2     0.4    +      -       -      -
    159D  GLN*     3.5    18.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 157 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45A  GLY*     3.3    24.2    -      -       -      -
     46A  PRO*     3.4    35.5    +      -       +      +
     48A  PHE*     3.9    20.6    -      +       +      -
     49A  ILE*     3.6    31.3    +      -       +      +
     47D  GLN*     5.7     0.4    -      -       +      +
     51D  VAL*     4.1    19.1    -      -       +      +
     54D  LEU*     4.3    13.2    -      -       +      -
    103D  ILE*     6.3     0.2    -      -       +      -
    107D  LEU*     3.7    26.8    -      -       +      +
    153D  PHE      2.8    27.0    +      -       -      -
    154D  LEU*     3.1    13.0    +      -       +      +
    155D  GLU      3.1     1.0    +      -       -      -
    156D  ALA*     1.3    76.9    -      -       -      +
    158D  VAL*     1.3    60.9    +      -       -      +
    159D  GLN      3.6     0.2    -      -       -      -
    160D  GLU      4.0     1.4    -      -       -      +
----------------------------------------------------------
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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