Contacts of the helix formed by residues 59 - 83 (chain B) in PDB entry 4K71


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 TRP 59 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109A  ASN*     3.8     9.6    -      -       +      +
    418A  MET*     3.5    27.6    -      -       +      -
    419A  SER*     4.6     0.4    +      -       -      -
    422A  THR*     3.0    29.3    +      -       +      +
    425A  GLU*     4.3     5.1    +      -       -      -
    426A  VAL*     5.3     3.3    -      -       +      +
    460A  LEU*     3.9    14.6    -      -       +      -
    463A  LEU*     3.4    40.6    -      -       +      +
    464A  HIS*     3.9    29.2    -      +       +      -
    467A  THR*     3.4    28.0    -      -       -      +
     57B  VAL      3.5     0.6    +      -       -      -
     58B  SER*     1.3    87.9    +      -       -      +
     60B  TYR*     1.3    63.6    +      -       -      +
     61B  TRP      3.4     2.2    -      -       -      -
     62B  GLU*     3.4    29.7    +      -       +      +
     63B  LYS*     2.9    44.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 60 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111A  ASN*     5.9     4.3    -      -       -      -
     35B  TYR*     3.6     1.4    +      -       -      -
     56B  GLN*     3.6    26.9    -      -       +      +
     57B  VAL*     3.2    24.8    +      -       +      +
     58B  SER      3.1     5.7    +      -       -      -
     59B  TRP*     1.3    75.2    -      -       -      +
     61B  TRP*     1.3    95.8    +      +       -      +
     63B  LYS*     3.2    12.7    +      -       +      +
     64B  GLU*     2.6    57.1    +      -       +      +
    162B  ARG*     3.8    28.5    +      -       +      +
    165B  GLU*     5.7     5.6    -      -       +      -
    166B  HIS*     2.5    37.4    +      +       -      -
----------------------------------------------------------
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Residues in contact with TRP 61 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    419A  SER*     3.6    28.9    +      -       -      -
    421A  PRO*     4.9     8.1    -      -       +      -
     35B  TYR*     3.6    31.2    -      +       -      -
     36B  LEU*     3.7    22.9    -      -       +      -
     45B  ALA*     3.5    28.8    -      -       +      +
     46B  GLU      3.4    15.0    -      -       -      -
     47B  PRO*     3.4    45.8    -      -       +      +
     51B  TRP*     5.3     6.4    +      -       +      -
     54B  GLU*     5.1     2.9    +      -       -      -
     56B  GLN*     4.1    17.4    -      -       +      +
     57B  VAL      4.9     0.2    +      -       -      -
     59B  TRP      3.4     0.2    -      -       -      -
     60B  TYR*     1.3    99.7    -      +       -      +
     62B  GLU*     1.3    59.3    +      -       -      +
     64B  GLU*     3.2    10.2    +      -       +      +
     65B  THR*     2.9    30.7    +      -       -      -
    166B  HIS*     5.2     3.6    -      +       -      -
----------------------------------------------------------
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Residues in contact with GLU 62 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    417A  GLN      5.3     0.7    -      -       -      +
    418A  MET*     3.5     7.3    -      -       -      +
    419A  SER*     2.7    40.2    +      -       -      +
    422A  THR*     2.8    30.0    +      -       -      +
    467A  THR*     3.6    23.1    -      -       -      +
    469A  VAL*     3.6    25.2    -      -       +      +
     59B  TRP*     3.4    29.0    -      -       +      +
     60B  TYR      3.3     0.2    -      -       -      -
     61B  TRP*     1.3    74.1    +      -       -      +
     63B  LYS*     1.3    56.7    +      -       -      +
     65B  THR*     3.2     9.8    +      -       -      -
     66B  THR*     2.8    32.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 63 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  ASP*     4.8     8.2    +      -       -      -
    109A  ASN*     4.3    23.3    +      -       -      +
    463A  LEU*     5.8     1.6    -      -       -      +
    467A  THR*     4.0    22.6    -      -       +      +
     58B  SER      5.0     0.2    +      -       -      -
     59B  TRP*     2.9    36.2    +      -       -      +
     60B  TYR*     3.5    11.9    -      -       +      +
     62B  GLU*     1.3    72.3    -      -       -      +
     64B  GLU*     1.3    65.8    +      -       -      +
     66B  THR*     3.2     1.3    +      -       -      -
     67B  ASP*     3.0    30.1    +      -       -      +
    162B  ARG*     3.6    13.5    -      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
      9B  TYR*     2.7    33.0    +      -       -      -
     35B  TYR*     2.7    16.6    +      -       -      -
     36B  LEU*     3.4    14.6    -      -       +      +
     45B  ALA*     3.9    15.3    -      -       +      -
     60B  TYR*     2.6    54.0    +      -       +      +
     61B  TRP*     3.2     9.8    +      -       +      +
     63B  LYS*     1.3    76.0    -      -       -      +
     65B  THR*     1.3    63.2    +      -       -      +
     67B  ASP*     3.4     1.9    +      -       -      +
     68B  LEU*     3.1    29.8    +      -       -      +
    154B  PHE*     5.4     0.3    -      -       -      -
    162B  ARG*     3.4    21.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 65 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    468A  PRO      5.1     0.2    -      -       -      +
    469A  VAL*     4.8    11.4    -      -       +      +
     38B  TYR*     4.3     4.1    -      -       +      -
     43B  GLY      3.4    25.8    -      -       -      +
     44B  GLU*     3.8     5.7    -      -       -      +
     45B  ALA*     2.9    30.2    +      -       -      +
     61B  TRP      2.9    15.9    +      -       -      -
     62B  GLU*     3.2    12.5    +      -       -      +
     64B  GLU*     1.3    78.2    -      -       -      +
     66B  THR*     1.3    62.8    +      -       -      +
     68B  LEU*     3.4     1.6    +      -       -      +
     69B  ARG*     3.1    43.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 66 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    466A  LYS      4.3    13.9    -      -       -      +
    467A  THR*     3.3    30.3    -      -       +      -
    468A  PRO*     4.2     9.8    +      -       +      +
     62B  GLU      2.8    21.1    +      -       -      -
     63B  LYS*     3.2     4.9    +      -       -      -
     65B  THR*     1.3    74.3    -      -       -      +
     67B  ASP*     1.3    66.2    +      -       -      +
     69B  ARG*     3.3    17.8    +      -       +      +
     70B  ILE*     3.3    26.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 67 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63B  LYS*     3.0    17.0    +      -       -      +
     64B  GLU*     3.9     4.0    -      -       -      +
     66B  THR*     1.3    81.1    -      -       -      +
     68B  LEU*     1.3    61.5    +      -       +      +
     70B  ILE*     3.5    14.4    +      -       -      +
     71B  LYS*     3.2    25.9    +      -       -      +
    154B  PHE*     3.9    26.0    -      -       +      -
    158B  SER*     4.5     6.1    +      -       -      -
    162B  ARG*     2.8    32.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 68 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9B  TYR*     4.2    23.3    -      -       +      -
     11B  LEU*     4.7    10.5    -      -       +      -
     24B  PHE*     3.8     3.5    -      -       -      -
     26B  VAL*     4.0    18.2    -      -       +      -
     36B  LEU*     3.9    28.9    -      -       +      -
     38B  TYR*     3.7    46.9    -      -       +      -
     45B  ALA*     4.3     2.7    -      -       +      -
     64B  GLU*     3.1    19.1    +      -       -      +
     65B  THR      4.1     0.2    -      -       -      +
     66B  THR      3.3     0.2    -      -       -      -
     67B  ASP*     1.3    75.3    -      -       -      +
     69B  ARG*     1.3    55.0    +      -       -      +
     71B  LYS*     3.1     5.6    +      -       +      +
     72B  GLU*     2.8    34.5    +      -       -      +
    154B  PHE*     4.7    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 69 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    468A  PRO*     3.1    31.7    +      -       -      +
    469A  VAL*     4.5    15.0    +      -       -      +
     38B  TYR*     3.3    20.4    +      -       +      +
     42B  ARG      5.2     0.6    +      -       -      -
     43B  GLY*     2.9    32.8    +      -       -      -
     65B  THR*     3.1    30.7    +      -       -      +
     66B  THR*     3.3     9.5    +      -       +      +
     68B  LEU*     1.3    71.9    -      -       -      +
     70B  ILE*     1.3    65.6    +      -       +      +
     72B  GLU*     3.3     8.1    -      -       -      +
     73B  LYS*     3.2    27.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 70 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66B  THR*     3.3    31.9    +      -       +      +
     67B  ASP*     3.6    14.4    -      -       -      +
     68B  LEU      3.3     0.2    -      -       -      -
     69B  ARG*     1.3    77.1    -      -       +      +
     71B  LYS*     1.3    68.8    +      -       +      +
     73B  LYS*     3.2    12.6    +      -       +      +
     74B  LEU*     3.1    33.0    +      -       +      +
    147B  ALA*     6.2     2.0    -      -       -      -
    150B  LYS*     4.3    41.7    -      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
     11B  LEU*     3.7    19.1    -      -       +      -
     24B  PHE*     3.9    12.8    -      -       +      -
     67B  ASP      3.2    16.5    +      -       -      +
     68B  LEU*     3.1    13.7    +      -       +      +
     70B  ILE*     1.3    85.7    -      -       +      +
     72B  GLU*     1.3    63.2    +      -       -      +
     74B  LEU*     3.2    14.0    +      -       +      +
     75B  PHE*     2.9    37.5    +      -       +      -
     94B  LEU*     3.5    21.8    -      -       +      -
    150B  LYS*     4.9     1.6    +      -       -      +
    151B  GLU*     2.7    33.7    +      -       -      +
    154B  PHE*     3.6    36.0    -      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
     24B  PHE*     3.6    31.6    -      -       +      -
     38B  TYR*     2.6    30.2    +      -       -      -
     40B  SER*     3.3    34.2    -      -       -      +
     43B  GLY*     5.5     0.2    -      -       -      -
     68B  LEU      2.8    16.9    +      -       -      +
     69B  ARG*     3.3    13.0    -      -       -      +
     70B  ILE      3.2     0.2    -      -       -      -
     71B  LYS*     1.3    71.8    -      -       -      +
     73B  LYS*     1.3    66.0    +      -       +      +
     75B  PHE*     3.2     1.7    +      -       -      +
     76B  LEU*     3.0    41.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 73 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69B  ARG*     3.2    14.1    +      -       -      +
     70B  ILE*     3.6    11.2    -      -       +      +
     72B  GLU*     1.3    80.9    -      -       +      +
     74B  LEU*     1.3    59.4    +      -       +      +
     76B  LEU*     3.3     7.7    +      -       -      +
     77B  GLU*     2.9    34.4    +      -       -      +
    144B  GLN*     6.0     1.1    -      -       -      +
----------------------------------------------------------
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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  ILE*     3.1    22.8    +      -       +      +
     71B  LYS*     3.5    20.9    -      -       +      +
     73B  LYS*     1.3    77.3    -      -       +      +
     75B  PHE*     1.3    65.2    +      -       +      +
     77B  GLU*     3.2     4.9    +      -       -      +
     78B  ALA      3.2     9.7    +      -       -      -
    127B  TRP*     4.6    11.2    -      -       +      -
    141B  TRP*     2.8    52.5    +      -       +      +
    144B  GLN*     3.5    33.7    -      -       -      +
    147B  ALA*     4.2    26.2    -      -       +      +
    151B  GLU*     5.8     2.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 75 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11B  LEU*     3.7    39.0    -      -       +      -
     13B  ALA*     3.7    25.6    -      -       +      -
     24B  PHE*     3.7    15.0    -      +       +      -
     71B  LYS*     2.9    28.5    +      -       +      +
     72B  GLU      3.8     3.4    -      -       -      +
     74B  LEU*     1.3    80.1    -      -       +      +
     76B  LEU*     1.3    63.9    +      -       -      +
     78B  ALA*     3.4    16.5    +      -       -      +
     79B  PHE*     4.1    10.4    +      -       -      -
     90B  LEU*     3.7    43.0    -      -       +      +
     92B  GLY*     3.9    10.5    -      -       -      -
     94B  LEU*     5.5     1.3    -      -       +      -
    110B  PHE*     4.0    29.2    -      +       -      -
    141B  TRP*     4.2    11.2    -      +       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
     13B  ALA*     4.3    11.7    -      -       +      -
     14B  VAL      4.6     0.7    -      -       -      +
     23B  ALA*     4.2    28.9    -      -       +      +
     24B  PHE*     4.8     3.1    -      -       +      -
     40B  SER*     6.0     1.1    -      -       -      -
     72B  GLU*     3.0    40.4    +      -       +      +
     73B  LYS*     4.0     5.2    -      -       -      +
     75B  PHE*     1.3    75.4    -      -       +      +
     77B  GLU*     1.3    63.2    +      -       -      +
     78B  ALA      3.4     0.7    +      -       -      -
     79B  PHE*     3.5    41.6    +      -       +      +
     80B  LYS*     3.9    12.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 77 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73B  LYS*     2.9    18.8    +      -       -      +
     74B  LEU      3.2     6.5    +      -       -      +
     76B  LEU*     1.3    75.1    -      -       -      +
     78B  ALA*     1.3    64.2    +      -       -      +
     80B  LYS*     3.2    42.9    +      -       -      +
     81B  ALA*     3.3    11.8    +      -       -      +
    140B  ARG*     3.3    31.9    +      -       +      +
    141B  TRP*     4.7     2.9    -      -       -      +
    144B  GLN*     3.6    28.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 78 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74B  LEU      3.2     5.1    +      -       -      -
     75B  PHE      3.4    13.2    -      -       -      +
     76B  LEU      3.2     0.2    -      -       -      -
     77B  GLU*     1.3    76.1    -      -       -      +
     79B  PHE*     1.3    58.3    +      -       +      +
     81B  ALA*     3.0    21.2    +      -       -      +
     82B  LEU*     3.2    16.0    +      -       -      +
     90B  LEU*     3.5    23.6    -      -       +      -
    137B  ILE*     3.7    31.2    -      -       +      +
    140B  ARG*     5.6     0.2    -      -       -      -
    141B  TRP*     4.0    10.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 79 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13B  ALA*     3.5    27.4    -      -       +      -
     14B  VAL      3.5     7.4    -      -       -      -
     15B  SER*     3.4    39.3    -      -       -      -
     75B  PHE      4.2     4.0    -      -       -      -
     76B  LEU*     3.5    35.0    +      -       +      +
     77B  GLU      3.3     0.8    -      -       -      -
     78B  ALA*     1.3    75.5    -      -       +      +
     80B  LYS*     1.3    56.4    +      -       +      +
     82B  LEU*     3.3    11.1    +      -       +      +
     83B  GLY*     2.7    31.2    +      -       -      -
     84B  GLY      5.2     0.5    -      -       -      +
     88B  TYR*     3.5    44.5    -      +       +      -
     90B  LEU*     4.1    19.1    -      -       +      -
    112B  LEU*     5.6     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 80 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76B  LEU*     4.2    12.8    -      -       -      +
     77B  GLU*     3.2    44.1    +      -       -      +
     79B  PHE*     1.3    74.5    -      -       +      +
     81B  ALA*     1.3    64.8    +      -       -      +
     83B  GLY*     3.5    11.8    +      -       -      +
    140B  ARG*     3.7    21.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 81 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77B  GLU      3.3     7.3    +      -       -      +
     78B  ALA*     3.0    11.7    +      -       -      +
     80B  LYS*     1.3    78.7    -      -       -      +
     82B  LEU*     1.3    61.4    +      -       -      +
    136B  ALA*     3.7    41.8    -      -       +      +
    137B  ILE*     4.3     4.0    -      -       +      +
    140B  ARG*     3.7    30.2    -      -       +      +
----------------------------------------------------------
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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  ALA      3.2    11.9    +      -       -      +
     79B  PHE*     3.7     9.0    -      -       +      +
     81B  ALA*     1.3    80.1    -      -       -      +
     83B  GLY*     1.3    63.7    +      -       -      +
     88B  TYR*     3.6    48.9    +      -       +      +
    112B  LEU*     3.8    21.1    -      -       +      -
    133B  GLU*     3.7    42.2    -      -       +      +
    136B  ALA*     4.6     4.0    -      -       +      -
    137B  ILE*     4.1    17.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 83 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79B  PHE      2.7    18.9    +      -       -      -
     80B  LYS*     3.5    12.1    +      -       -      -
     81B  ALA      3.5     1.4    -      -       -      -
     82B  LEU*     1.3    76.3    -      -       -      +
     84B  GLY*     1.3    64.1    +      -       -      +
     88B  TYR*     2.6    29.5    +      -       -      -
----------------------------------------------------------
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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