Contacts of the helix formed by residues 56 - 87 (chain B) in PDB entry 4WB7


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 56 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52B  ASP      3.7    15.9    -      -       -      +
     53B  VAL      3.2     4.5    +      -       -      +
     54B  LEU      3.2     1.2    -      -       -      -
     55B  SER*     1.3    80.2    +      -       -      +
     57B  PRO*     1.3    63.3    -      -       -      +
     58B  ARG*     3.2    32.4    +      -       -      +
     59B  LYS*     3.0    28.1    +      -       +      +
     60B  ARG*     2.7    34.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 57 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16B  ASP*     5.9     3.8    -      -       -      +
     54B  LEU      5.4     0.2    -      -       -      +
     55B  SER      3.5     9.6    -      -       -      +
     56B  ASP*     1.3    87.8    -      -       -      +
     58B  ARG*     1.3    57.6    +      -       -      +
     60B  ARG*     3.7     9.2    -      -       +      +
     61B  GLU*     2.9    31.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 58 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56B  ASP*     3.2    25.0    +      -       -      +
     57B  PRO*     1.3    80.0    -      -       -      +
     59B  LYS*     1.3    90.4    +      -       -      +
     61B  GLU*     3.2    13.8    +      -       -      +
     62B  ILE*     3.1    39.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 59 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52B  ASP*     4.0    25.5    +      -       -      +
     53B  VAL*     3.6    28.8    -      -       +      +
     56B  ASP*     3.0    18.2    +      -       +      +
     58B  ARG*     1.3   102.5    -      -       -      +
     60B  ARG*     1.3    66.0    +      -       -      +
     62B  ILE*     3.5     9.8    +      -       +      +
     63B  PHE*     3.1    23.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 60 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5B  TYR*     3.0    24.7    +      -       -      +
     12B  ARG      3.2    24.5    +      -       -      -
     13B  GLY*     3.8     2.8    -      -       -      -
     14B  ALA      2.7    33.5    +      -       -      +
     15B  SER*     4.8     0.6    -      -       -      +
     16B  ASP*     4.1    13.1    +      -       -      -
     19B  ILE*     3.8    16.4    -      -       -      +
     53B  VAL*     3.4     8.2    +      -       -      +
     54B  LEU*     3.5    26.7    -      -       +      +
     56B  ASP      2.7    20.9    +      -       -      +
     57B  PRO*     3.7     8.7    -      -       -      +
     59B  LYS*     1.3    73.4    -      -       -      +
     61B  GLU*     1.3    51.3    +      -       -      +
     63B  PHE*     3.2     6.4    +      -       -      +
     64B  ASP*     2.8    43.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 61 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57B  PRO      2.9    16.6    +      -       -      +
     58B  ARG*     3.4    15.0    -      -       -      +
     60B  ARG*     1.3    73.8    -      -       -      +
     62B  ILE*     1.3    65.0    +      -       +      +
     64B  ASP*     3.1     8.2    +      -       -      +
     65B  ARG*     2.5    75.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 62 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58B  ARG*     3.1    28.9    +      -       +      +
     59B  LYS*     3.7    10.3    -      -       +      +
     61B  GLU*     1.3    82.9    -      -       +      +
     63B  PHE*     1.3    63.8    +      -       -      +
     65B  ARG*     3.5    17.3    +      -       -      +
     66B  TYR*     3.3    19.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 63 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2B  LYS      4.3     8.5    -      -       -      -
      3B  ASP*     4.0    14.4    -      -       -      -
      4B  TYR*     3.5    52.0    -      +       +      -
      5B  TYR*     3.6    38.8    -      +       -      -
     12B  ARG*     3.9    14.3    +      -       -      -
     53B  VAL*     4.4     9.0    -      -       +      -
     54B  LEU*     4.4     6.3    -      -       +      -
     59B  LYS      3.1    17.4    +      -       -      +
     60B  ARG*     3.6     3.4    -      -       -      +
     62B  ILE*     1.3    76.5    -      -       -      +
     64B  ASP*     1.3    66.8    +      -       -      +
     66B  TYR*     3.5    21.3    +      +       +      +
     67B  GLY      3.3    14.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 64 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5B  TYR*     2.9    38.1    +      -       -      -
     12B  ARG*     4.4    16.7    +      -       -      +
     60B  ARG*     2.8    32.9    +      -       -      +
     61B  GLU*     3.7     7.4    -      -       -      +
     63B  PHE*     1.3    74.9    -      -       -      +
     65B  ARG*     1.3    60.3    +      -       +      +
     67B  GLY*     3.1     3.2    +      -       -      +
     68B  GLU*     3.0    32.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 65 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61B  GLU*     2.5    53.7    +      -       +      +
     62B  ILE*     3.8    16.0    -      -       -      +
     63B  PHE      3.4     0.2    -      -       -      -
     64B  ASP*     1.3    74.0    -      -       +      +
     66B  TYR*     1.3    65.1    +      -       -      +
     68B  GLU*     3.4     9.3    +      -       +      +
     69B  GLU*     3.2    35.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 66 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1B  GLY*     5.8     4.2    -      -       -      -
     12B  ARG*     5.7     0.4    -      -       -      -
     62B  ILE      3.3    11.8    +      -       -      +
     63B  PHE*     3.6    28.3    -      +       +      +
     64B  ASP      3.2     0.6    -      -       -      -
     65B  ARG*     1.3    79.7    -      -       -      +
     67B  GLY*     1.3    65.9    +      -       -      +
     69B  GLU*     3.2    17.4    +      -       +      +
     70B  VAL*     3.1    46.6    +      -       +      +
    358B  ILE*     5.6     5.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 67 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12B  ARG*     3.5    27.4    -      -       -      -
     63B  PHE      3.3     4.6    +      -       -      -
     64B  ASP      3.1     5.3    +      -       -      -
     66B  TYR*     1.3    86.6    -      -       -      +
     68B  GLU*     1.3    57.4    +      -       -      +
     70B  VAL*     3.1     8.3    +      -       -      +
     71B  LYS*     3.0    27.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 68 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12B  ARG*     5.5     6.4    +      -       -      -
     64B  ASP*     3.0    18.7    +      -       +      +
     65B  ARG*     3.7    13.0    -      -       +      +
     66B  TYR      3.2     0.2    -      -       -      -
     67B  GLY*     1.3    76.9    -      -       -      +
     69B  GLU*     1.3    58.7    +      -       +      +
     71B  LYS*     3.3    40.6    +      -       -      +
     72B  GLU*     3.0    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 69 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65B  ARG*     3.2    22.6    +      -       -      +
     66B  TYR*     3.2    16.5    +      -       +      +
     68B  GLU*     1.3    73.9    -      -       +      +
     70B  VAL*     1.3    67.4    +      -       +      +
     72B  GLU*     3.4    17.7    +      -       -      +
     73B  PHE*     3.0    24.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 70 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66B  TYR*     3.1    48.9    +      -       +      +
     67B  GLY*     3.1     7.8    +      -       -      +
     69B  GLU*     1.3    76.5    -      -       +      +
     71B  LYS*     1.3    58.4    +      -       -      +
     73B  PHE*     3.4     7.4    +      -       +      +
     74B  LEU*     3.0    29.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 71 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67B  GLY      3.0    12.4    +      -       -      +
     68B  GLU*     3.3    42.4    +      -       -      +
     70B  VAL*     1.3    78.2    -      -       -      +
     72B  GLU*     1.3    56.5    +      -       -      +
     74B  LEU*     3.4    10.8    +      -       +      +
     75B  ALA*     2.9    28.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 72 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68B  GLU      3.0    15.8    +      -       -      +
     69B  GLU*     3.6    20.3    -      -       -      +
     70B  VAL      3.3     0.2    -      -       -      -
     71B  LYS*     1.3    74.5    -      -       -      +
     73B  PHE*     1.3    65.8    +      -       -      +
     75B  ALA*     3.2     9.9    +      -       -      +
     76B  LYS*     3.0    51.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 73 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69B  GLU      3.0    16.8    +      -       -      +
     70B  VAL*     3.7     6.7    -      -       +      +
     72B  GLU*     1.3    78.3    -      -       -      +
     74B  LEU*     1.3    64.0    +      -       -      +
     76B  LYS*     3.4    15.7    +      -       +      +
     77B  ALA*     3.1    26.3    +      -       +      +
    155B  PHE*     6.1     2.9    -      +       -      -
    361B  TYR*     3.5    32.5    -      +       -      -
----------------------------------------------------------
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Residues in contact with LEU 74 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70B  VAL*     3.0    19.0    +      -       +      +
     71B  LYS*     3.5    10.5    -      -       +      +
     72B  GLU      3.3     0.2    -      -       -      -
     73B  PHE*     1.3    77.0    -      -       -      +
     75B  ALA*     1.3    60.2    +      -       -      +
     77B  ALA*     3.1     9.4    +      -       +      +
     78B  LYS*     2.9    59.4    +      -       +      +
    214B  SER*     3.5    35.2    -      -       -      +
    215B  LEU*     5.0     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 75 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71B  LYS      2.9    15.4    +      -       -      +
     72B  GLU*     3.2    14.1    +      -       +      +
     74B  LEU*     1.3    77.0    -      -       -      +
     76B  LYS*     1.3    57.0    +      -       +      +
     78B  LYS*     3.4     9.5    +      -       -      +
     79B  GLU*     3.0    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 76 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72B  GLU*     3.0    47.1    +      -       +      +
     73B  PHE*     3.7    17.7    -      -       +      +
     74B  LEU      3.2     0.2    -      -       -      -
     75B  ALA*     1.3    73.0    -      -       +      +
     77B  ALA*     1.3    66.4    +      -       -      +
     79B  GLU*     3.2     9.7    +      -       -      +
     80B  ASP*     3.0    24.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 77 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73B  PHE*     3.1    20.6    +      -       +      +
     74B  LEU*     3.1    15.5    +      -       +      +
     76B  LYS*     1.3    77.4    -      -       -      +
     78B  LYS*     1.3    62.2    +      -       -      +
     80B  ASP*     3.5     5.8    +      -       -      +
     81B  PHE*     3.1    23.7    +      -       -      +
    211B  TYR*     4.3    26.8    +      -       +      -
    215B  LEU*     4.2     5.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 78 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74B  LEU*     2.9    42.1    +      -       +      +
     75B  ALA*     3.7     7.2    -      -       -      +
     76B  LYS      3.2     0.2    -      -       -      -
     77B  ALA*     1.3    74.3    -      -       -      +
     79B  GLU*     1.3    60.2    +      -       -      +
     81B  PHE*     3.4     1.4    +      -       -      +
     82B  LEU*     2.9    46.2    +      -       +      +
    214B  SER      3.6    20.5    +      -       -      -
    215B  LEU*     3.6    23.6    -      -       +      +
    216B  ASP*     5.7     3.2    +      -       -      -
    245B  ARG*     6.2     1.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 79 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75B  ALA      3.0    14.8    +      -       -      +
     76B  LYS*     3.2    12.4    +      -       -      +
     78B  LYS*     1.3    73.1    -      -       -      +
     80B  ASP*     1.3    77.7    +      -       -      +
     82B  LEU*     3.3     5.1    +      -       -      +
     83B  LYS*     2.4    70.6    +      -       +      +
    504B   ZN      2.2    34.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 80 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76B  LYS      3.0    16.6    +      -       -      +
     77B  ALA*     3.8     6.3    -      -       -      +
     79B  GLU*     1.3    83.7    +      -       -      +
     81B  PHE*     1.3    63.1    +      -       -      +
     83B  LYS*     3.9     1.4    -      -       -      +
     84B  LYS*     2.7    64.5    +      -       -      +
    152B  ALA      4.7     1.6    -      -       -      +
    154B  ASN*     4.4    14.6    +      -       -      +
    504B   ZN      3.1    19.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 81 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77B  ALA      3.1    18.1    +      -       -      +
     78B  LYS      3.7     3.1    -      -       -      +
     80B  ASP*     1.3    77.8    -      -       -      +
     82B  LEU*     1.3    69.1    +      -       +      +
     84B  LYS*     3.2     3.3    +      -       -      +
     85B  TRP*     2.8    64.0    +      +       +      +
    149B  ILE*     4.5     4.3    -      -       +      -
    152B  ALA*     3.6    38.6    -      -       +      +
    153B  VAL*     4.0    12.8    -      -       +      -
    211B  TYR*     5.1     1.3    -      -       -      +
    215B  LEU*     3.9    24.7    -      -       +      -
    217B  LEU*     4.0    31.9    -      -       +      -
    245B  ARG*     3.6    29.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 82 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78B  LYS*     2.9    31.5    +      -       +      +
     79B  GLU*     3.9     5.2    -      -       -      +
     81B  PHE*     1.3    89.9    -      -       +      +
     83B  LYS*     1.3    67.3    +      -       +      +
     85B  TRP*     4.2     9.4    -      -       +      -
     86B  GLU*     2.9    51.7    +      -       -      +
    245B  ARG*     4.3    24.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 83 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79B  GLU*     2.4    64.6    +      -       +      +
     80B  ASP*     3.9     4.9    -      -       -      +
     82B  LEU*     1.3    77.4    -      -       +      +
     84B  LYS*     1.3    65.0    +      -       +      +
     86B  GLU*     4.2     8.2    -      -       -      +
     87B  SER*     3.4    23.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 84 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80B  ASP*     2.7    42.7    +      -       -      +
     81B  PHE      3.2     1.4    +      -       -      -
     83B  LYS*     1.3    80.5    -      -       +      +
     85B  TRP*     1.3    61.3    +      -       -      +
     87B  SER      4.2     3.4    -      -       -      -
     88B  PRO*     3.4    26.2    -      -       -      +
     89B  ALA      4.7     0.2    +      -       -      -
    148B  ARG      5.0     0.9    -      -       -      +
    151B  GLN*     3.8    17.9    +      -       +      +
    152B  ALA*     3.6    32.3    +      -       +      +
    153B  VAL      4.9     2.0    +      -       -      -
    154B  ASN*     4.5    15.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 85 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81B  PHE*     2.8    45.5    +      +       +      +
     82B  LEU*     3.9    13.0    -      -       +      +
     84B  LYS*     1.3    78.2    -      -       -      +
     86B  GLU*     1.3    77.5    +      -       +      +
     88B  PRO*     3.4     5.9    -      -       -      +
    145B  ASN*     4.9    10.3    -      -       -      -
    148B  ARG*     2.9    91.8    +      -       +      +
    149B  ILE*     3.5    31.0    -      -       +      -
    152B  ALA*     3.9     4.9    -      -       +      +
    245B  ARG*     4.5    28.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 86 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82B  LEU*     2.9    42.4    +      -       -      +
     83B  LYS*     4.3     8.8    -      -       -      +
     85B  TRP*     1.3    92.2    -      -       +      +
     87B  SER*     1.3    62.9    +      -       -      +
     88B  PRO*     3.7     5.4    -      -       -      +
    148B  ARG*     4.2     6.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 87 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83B  LYS      3.4    14.0    +      -       -      +
     84B  LYS*     3.7     7.2    -      -       -      +
     86B  GLU*     1.3    81.6    +      -       -      +
     88B  PRO*     1.3    68.1    -      -       -      +
     89B  ALA*     3.5     1.6    +      -       -      -
----------------------------------------------------------
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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