Contacts of the helix formed by residues 54 - 81 (chain B) in PDB entry 4GCK


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 SER 54 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49B  TYR*     3.8     5.6    -      -       -      -
     52B  PHE*     3.2    13.2    -      -       -      +
     53B  PRO*     1.3    85.1    -      -       -      +
     55B  LYS*     1.3    63.0    +      -       -      +
     56B  THR*     3.4    13.4    +      -       -      -
     57B  ARG*     3.4    26.7    +      -       -      +
     58B  MET*     3.3    14.2    +      -       -      +
    118B  GLN*     4.8     2.7    +      -       -      -
     13W    C      3.3    26.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 55 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19B  LEU*     5.9     0.4    -      -       +      -
     31B  ARG*     4.0     6.9    -      -       -      +
     32B  ILE*     2.6    29.0    +      -       +      +
     34B  THR*     4.0    15.5    -      -       +      +
     37B  LEU*     5.3     5.8    -      -       +      -
     54B  SER*     1.3    73.1    -      -       -      +
     56B  THR*     1.3    66.3    +      -       -      +
     57B  ARG      3.1     0.7    -      -       -      -
     58B  MET*     2.9    40.0    +      -       +      +
     59B  PHE*     3.2    28.4    +      -       +      -
    117B  GLU*     3.3    35.4    +      -       -      +
     12W    A      2.5    41.5    +      -       -      -
     13W    C      2.9    14.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 56 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54B  SER*     3.4    11.1    +      -       -      -
     55B  LYS*     1.3    77.3    -      -       -      +
     57B  ARG*     1.3    55.1    +      -       -      +
     59B  PHE*     3.1     4.0    +      -       -      +
     60B  ASP*     2.7    33.4    +      -       -      +
    117B  GLU*     4.5     7.0    +      -       -      +
    118B  GLN*     2.6    49.2    +      -       +      +
    120B  ARG*     3.6    18.4    -      -       -      +
    121B  LEU*     3.5    30.0    -      -       +      +
     13W    C      4.8     1.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 57 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12B  ARG*     4.9    12.1    -      -       -      +
     52B  PHE*     3.9     8.0    -      -       +      -
     53B  PRO*     3.4    35.6    -      -       +      +
     54B  SER*     3.4    20.6    +      -       -      +
     55B  LYS      3.1     0.2    -      -       -      -
     56B  THR*     1.3    85.0    -      -       -      +
     58B  MET*     1.3    61.9    +      -       -      +
     60B  ASP*     2.6    37.8    +      -       -      +
     61B  SER*     3.0    27.3    +      -       -      -
    120B  ARG*     4.2    12.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 58 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15B  ILE*     3.9    12.8    -      -       +      -
     16B  LEU*     3.7    15.5    -      -       +      +
     19B  LEU*     3.9    18.2    -      -       +      -
     34B  THR*     5.0     6.1    -      -       +      -
     37B  LEU*     3.4    30.5    -      -       +      -
     48B  LEU*     5.2     9.2    -      -       +      +
     49B  TYR*     5.3     4.9    -      -       +      +
     52B  PHE*     3.6    31.6    -      -       +      -
     54B  SER      3.3     7.9    -      -       -      +
     55B  LYS*     2.9    48.7    +      -       +      +
     57B  ARG*     1.3    77.2    -      -       -      +
     59B  PHE*     1.3    58.6    +      -       -      +
     61B  SER*     3.0     6.6    +      -       -      -
     62B  LEU*     2.9    24.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 59 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19B  LEU*     4.1    26.9    -      -       +      -
     23B  LEU*     4.0    17.3    -      -       +      -
     32B  ILE*     5.0     6.1    -      -       +      -
     55B  LYS*     3.2    25.0    +      -       +      -
     56B  THR      3.1     7.0    +      -       -      +
     58B  MET*     1.3    76.9    -      -       -      +
     60B  ASP*     1.3    60.5    +      -       -      +
     62B  LEU*     3.1     7.3    +      -       +      +
     63B  ILE*     2.8    36.3    +      -       +      +
    108B  ILE*     3.7    30.7    -      -       +      -
    113B  ALA*     4.6    13.7    -      -       +      -
    114B  LEU*     3.8    20.4    -      -       +      -
    117B  GLU*     3.5    33.7    -      -       +      -
    121B  LEU*     3.8    17.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 60 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56B  THR      2.7    15.1    +      -       -      +
     57B  ARG*     2.6    45.0    +      -       -      +
     58B  MET      3.2     0.2    -      -       -      -
     59B  PHE*     1.3    72.4    -      -       -      +
     61B  SER*     1.3    58.0    +      -       -      +
     63B  ILE*     3.3     1.0    +      -       -      -
     64B  GLU*     2.9    22.3    +      -       -      +
    120B  ARG*     2.4    40.2    +      -       -      -
    121B  LEU*     3.5    12.4    -      -       -      +
    124B  ARG*     2.6    38.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 61 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12B  ARG*     3.7    22.2    +      -       -      -
     16B  LEU*     3.8    26.7    -      -       -      +
     52B  PHE*     3.8     4.0    -      -       -      -
     57B  ARG*     3.0    15.3    +      -       -      -
     58B  MET      3.0     9.2    +      -       -      -
     60B  ASP*     1.3    77.9    -      -       -      +
     62B  LEU*     1.3    57.3    +      -       -      +
     64B  GLU*     3.4     7.9    +      -       -      +
     65B  PHE*     3.0    26.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 62 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16B  LEU*     3.7    41.1    -      -       +      +
     19B  LEU*     3.7    36.6    -      -       +      -
     20B  ALA*     4.7     4.3    -      -       +      +
     23B  LEU*     4.1     5.8    -      -       +      -
     58B  MET      2.9     8.5    +      -       -      +
     59B  PHE*     3.1     9.6    +      -       +      +
     61B  SER*     1.3    79.1    -      -       -      +
     63B  ILE*     1.3    56.7    +      -       -      +
     65B  PHE*     3.2    12.7    +      -       +      +
     66B  ILE*     3.0    31.6    +      -       -      +
    105B  LEU*     3.7    19.9    -      -       +      +
    108B  ILE*     3.8    26.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 63 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59B  PHE*     2.8    20.5    +      -       -      +
     60B  ASP*     3.6     4.3    -      -       -      +
     62B  LEU*     1.3    74.0    -      -       +      +
     64B  GLU*     1.3    66.8    +      -       -      +
     66B  ILE*     2.9    10.7    +      -       -      +
     67B  GLU*     2.8    28.8    +      -       +      +
    108B  ILE*     3.9    24.2    -      -       +      -
    114B  LEU*     4.6     3.1    -      -       +      -
    121B  LEU*     3.7    47.8    -      -       +      +
    124B  ARG*     3.6    33.9    -      -       +      +
    125B  ILE*     4.0    19.5    -      -       +      -
    128B  LEU*     5.6     2.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 64 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60B  ASP      2.9    16.7    +      -       -      +
     61B  SER*     3.7     8.5    -      -       -      +
     63B  ILE*     1.3    76.8    -      -       -      +
     65B  PHE*     1.3    63.1    +      -       -      +
     67B  GLU*     3.4     6.0    +      -       -      +
     68B  ASP*     3.0    45.2    +      -       -      +
    124B  ARG*     3.5    22.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 65 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61B  SER      3.0    15.2    +      -       -      +
     62B  LEU*     3.3    14.1    -      -       +      +
     63B  ILE      3.1     0.2    -      -       -      -
     64B  GLU*     1.3    78.3    -      -       -      +
     66B  ILE*     1.3    56.0    +      -       -      +
     68B  ASP*     3.4     6.3    +      -       +      +
     69B  SER*     2.5    50.0    +      -       -      -
     73B  ARG*     6.0     2.2    -      -       -      -
     98B  PHE*     4.2     8.7    -      +       -      -
    102B  ASN*     4.8     5.8    -      -       -      -
    105B  LEU*     3.7    33.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 66 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62B  LEU      3.0    16.7    +      -       -      +
     63B  ILE*     2.9    11.5    +      -       +      +
     65B  PHE*     1.3    77.1    -      -       -      +
     67B  GLU*     1.3    62.4    +      -       -      +
     69B  SER*     3.8     2.4    -      -       -      -
     70B  LEU*     2.8    47.2    +      -       +      +
     98B  PHE*     4.0    12.3    -      -       +      -
    105B  LEU*     3.7    45.3    -      -       +      +
    108B  ILE*     4.2    19.3    -      -       +      -
    109B  LEU*     4.3    17.9    -      -       +      -
    125B  ILE*     4.8     3.6    -      -       +      -
    128B  LEU*     4.0    17.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 67 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63B  ILE*     2.8    17.7    +      -       +      +
     64B  GLU*     3.8     7.5    -      -       -      +
     66B  ILE*     1.3    78.2    -      -       -      +
     68B  ASP*     1.3    63.0    +      -       -      +
     70B  LEU*     4.8     0.2    -      -       -      -
     71B  ILE*     2.8    48.4    +      -       +      +
    124B  ARG*     5.1    13.9    +      -       -      +
    127B  GLN*     6.2     0.2    -      -       -      +
    128B  LEU*     3.9    36.3    +      -       +      +
    131B  ARG*     2.7    32.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 68 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64B  GLU*     3.0    36.4    +      -       -      +
     65B  PHE*     4.0     6.3    -      -       +      +
     67B  GLU*     1.3    76.8    -      -       -      +
     69B  SER*     1.3    68.3    +      -       -      +
     71B  ILE*     4.9     1.8    -      -       -      -
     72B  THR*     2.8    37.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 69 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65B  PHE*     2.5    46.6    +      -       -      -
     66B  ILE      3.8     1.8    -      -       -      -
     68B  ASP*     1.3    78.4    -      -       -      +
     70B  LEU*     1.3    57.9    +      -       -      +
     72B  THR*     4.8     0.2    -      -       -      -
     73B  ARG*     2.7    55.1    +      -       -      +
     98B  PHE*     3.4    28.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 70 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66B  ILE*     2.8    46.3    +      -       +      +
     67B  GLU*     4.0     3.4    -      -       -      +
     69B  SER*     1.3    78.6    -      -       -      +
     71B  ILE*     1.3    62.0    +      -       +      +
     73B  ARG*     3.3     2.1    +      -       -      -
     74B  ILE*     2.9    41.1    +      -       +      +
     94B  LEU*     3.8    31.1    -      -       +      +
     95B  ILE*     4.4    13.0    -      -       +      -
     98B  PHE*     3.6    38.6    -      -       +      -
    109B  LEU*     5.5     3.8    -      -       +      -
    128B  LEU*     5.1     3.4    -      -       +      -
    132B  ILE*     4.9    17.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 71 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67B  GLU*     2.8    41.1    +      -       +      +
     68B  ASP*     4.5     2.0    -      -       -      +
     70B  LEU*     1.3    69.1    -      -       -      +
     72B  THR*     1.3    67.5    +      -       -      +
     74B  ILE*     3.1    11.1    +      -       +      +
     75B  ASN*     3.0    40.3    +      -       -      +
    128B  LEU*     4.1    13.2    -      -       +      -
    131B  ARG*     3.6    52.0    -      -       +      +
    132B  ILE*     4.6    12.1    -      -       +      +
    135B  GLN*     6.4     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 72 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68B  ASP*     2.8    29.9    +      -       -      +
     69B  SER*     4.0     2.2    -      -       -      -
     71B  ILE*     1.3    80.0    -      -       -      +
     73B  ARG*     1.3    72.0    +      -       -      +
     75B  ASN*     3.3    10.2    +      -       -      +
     76B  LEU*     3.2    32.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 73 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65B  PHE*     6.0     2.6    -      -       -      -
     69B  SER*     2.7    52.8    +      -       -      +
     71B  ILE      3.2     0.4    -      -       -      -
     72B  THR*     1.3    85.0    -      -       +      +
     74B  ILE*     1.3    65.8    +      -       -      +
     76B  LEU*     3.3    15.4    +      -       +      +
     77B  ILE*     3.0    26.8    +      -       +      +
     94B  LEU*     3.6    32.9    -      -       +      +
     98B  PHE*     4.8     9.1    -      -       -      -
    101B  ARG*     5.1    12.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 74 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70B  LEU*     2.9    27.1    +      -       +      +
     71B  ILE*     3.1    11.8    +      -       +      +
     73B  ARG*     1.3    74.6    -      -       -      +
     75B  ASN*     1.3    67.9    +      -       -      +
     77B  ILE*     3.1     8.8    +      -       -      +
     78B  LEU*     3.0    26.0    +      -       +      +
     91B  ILE*     3.8    42.8    -      -       +      -
     94B  LEU*     3.6    16.2    -      -       +      -
     95B  ILE*     5.4     2.7    -      -       +      -
    132B  ILE*     4.2    29.8    -      -       +      -
    135B  GLN*     3.9    24.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 75 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71B  ILE*     3.0    35.2    +      -       -      +
     72B  THR*     3.6     9.7    -      -       -      +
     74B  ILE*     1.3    79.1    -      -       -      +
     76B  LEU*     1.3    62.8    +      -       +      +
     78B  LEU*     3.1    19.9    +      -       -      +
     79B  LYS*     3.1    27.2    +      -       -      +
    135B  GLN*     4.3    13.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 76 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72B  THR*     3.2    28.0    +      -       +      +
     73B  ARG*     3.6    17.9    -      -       +      +
     74B  ILE      3.2     0.2    -      -       -      -
     75B  ASN*     1.3    74.3    -      -       -      +
     77B  ILE*     1.3    64.4    +      -       +      +
     79B  LYS*     3.2    12.8    +      -       +      +
     80B  ASP*     3.0    32.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 77 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73B  ARG*     3.0    20.3    +      -       +      +
     74B  ILE*     3.1     8.9    +      -       -      +
     76B  LEU*     1.3    77.8    -      -       +      +
     78B  LEU*     1.3    57.2    +      -       +      +
     80B  ASP*     4.3     4.5    -      -       -      -
     81B  GLU*     2.8    30.0    +      -       -      +
     87B  ARG*     4.1    22.2    -      -       +      +
     90B  LEU*     3.7    59.9    -      -       +      +
     91B  ILE*     3.9    15.0    -      -       +      +
     94B  LEU*     4.0    20.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 78 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74B  ILE*     3.0    18.7    +      -       +      +
     75B  ASN*     3.1    15.2    +      -       -      +
     77B  ILE*     1.3    76.6    -      -       -      +
     79B  LYS*     1.3    61.8    +      -       +      +
     81B  GLU      3.5     3.9    -      -       -      +
     82B  LYS*     5.5     0.2    -      -       -      -
     87B  ARG*     3.0    47.5    +      -       +      +
     91B  ILE*     4.5     8.3    -      -       +      -
    135B  GLN*     3.5    33.9    -      -       -      +
    139B  VAL*     3.5    29.4    -      -       +      -
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Residues in contact with LYS 79 (chain B). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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     75B  ASN*     3.1    25.7    +      -       -      +
     76B  LEU*     3.8    12.8    -      -       +      +
     77B  ILE      3.2     0.2    -      -       -      -
     78B  LEU*     1.3    81.4    -      -       +      +
     80B  ASP*     1.3    59.5    +      -       -      +
     81B  GLU      5.2     0.2    -      -       -      -
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Residues in contact with ASP 80 (chain B). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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     76B  LEU*     3.0    24.5    +      -       -      +
     77B  ILE*     3.8     5.2    -      -       -      +
     79B  LYS*     1.3    79.3    -      -       -      +
     81B  GLU*     1.3    61.9    +      -       +      +
     82B  LYS      4.3     0.3    +      -       -      -
     90B  LEU*     6.2     1.1    -      -       +      -
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Residues in contact with GLU 81 (chain B). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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     77B  ILE      2.8    13.1    +      -       -      +
     78B  LEU      3.5     3.8    -      -       -      +
     79B  LYS      5.2     0.4    -      -       -      -
     80B  ASP*     1.3    82.3    -      -       +      +
     82B  LYS*     1.3    57.1    +      -       -      +
     83B  ASP*     2.8    36.9    +      -       -      +
     86B  ALA*     3.6    30.6    -      -       +      +
     87B  ARG*     2.7    45.3    +      -       +      +
     90B  LEU*     4.0    19.6    -      -       +      +
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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) +   -    +    +   +   +    +    -
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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