Contacts of the helix formed by residues 431 - 455 (chain A) in PDB entry 4JGV


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 431 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    429A  GLU      3.9     0.6    +      -       -      -
    430A  LEU*     1.3    73.6    -      -       -      +
    432A  PRO*     1.3    73.6    -      -       -      +
    433A  ALA*     3.4     7.8    +      -       -      +
    434A  ASP*     3.0    21.0    +      -       -      +
    435A  GLN*     2.8    20.6    +      -       -      +
    519A  GLN*     2.3    35.4    +      -       -      -
    520A  GLU*     4.0    20.3    +      -       -      +
    523A  ARG*     4.1     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 432 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    430A  LEU      3.4     7.4    -      -       -      +
    431A  SER*     1.3    83.8    -      -       -      +
    433A  ALA*     1.3    61.7    +      -       -      +
    435A  GLN*     3.3    12.9    +      -       +      +
    436A  ASP*     3.1    32.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 433 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    431A  SER*     3.1     3.0    +      -       -      +
    432A  PRO*     1.3    75.7    -      -       -      +
    434A  ASP*     1.3    63.5    +      -       -      +
    436A  ASP*     3.3     8.4    +      -       -      +
    437A  LEU*     2.8    31.3    +      -       -      +
    519A  GLN*     3.6    28.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 434 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    430A  LEU*     4.3     8.9    -      -       +      +
    431A  SER*     3.0    25.7    +      -       -      +
    433A  ALA*     1.3    73.9    -      -       -      +
    435A  GLN*     1.3    61.2    +      -       -      +
    437A  LEU*     3.7     2.4    -      -       -      +
    438A  LEU*     2.9    40.9    +      -       +      +
    517A  GLY      4.5     1.0    -      -       -      +
    518A  LEU*     3.6    23.6    -      -       +      +
    519A  GLN*     2.8    30.6    +      -       -      +
    520A  GLU*     2.9    34.7    +      -       -      +
    524A  VAL*     4.6     3.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 435 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    422A  GLU*     2.8    27.6    -      -       -      +
    427A  PHE*     3.3    35.0    +      -       +      +
    428A  ALA*     2.9    35.3    +      -       -      +
    430A  LEU*     3.0    20.6    +      -       +      +
    431A  SER      2.8    11.6    +      -       -      +
    432A  PRO*     3.4    15.2    -      -       +      +
    433A  ALA      3.2     0.2    -      -       -      -
    434A  ASP*     1.3    78.1    -      -       -      +
    436A  ASP*     1.3    60.5    +      -       -      +
    438A  LEU*     3.3     0.4    +      -       -      -
    439A  LEU*     3.0    37.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 436 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418A  ARG*     4.1    15.5    +      -       -      +
    432A  PRO*     3.1    18.4    +      -       -      +
    433A  ALA*     3.7     8.9    -      -       -      +
    435A  GLN*     1.3    75.8    -      -       -      +
    437A  LEU*     1.3    62.0    +      -       -      +
    439A  LEU*     3.4     7.4    +      -       -      +
    440A  GLU*     2.9    43.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 437 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    433A  ALA      2.8    18.3    +      -       -      +
    434A  ASP*     3.7     5.4    -      -       -      +
    436A  ASP*     1.3    74.4    -      -       -      +
    438A  LEU*     1.3    62.5    +      -       -      +
    440A  GLU*     3.3    10.2    +      -       +      +
    441A  SER*     2.6    42.0    +      -       -      +
    515A  ARG*     3.9    11.0    -      -       +      -
    516A  HIS      3.6    25.6    -      -       -      +
    517A  GLY*     3.9     6.3    -      -       -      +
    518A  LEU*     3.7    35.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 438 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    427A  PHE*     4.0    10.8    -      -       +      -
    430A  LEU*     3.9    27.6    -      -       +      -
    434A  ASP      2.9    22.3    +      -       -      +
    435A  GLN      3.9     2.9    -      -       -      +
    437A  LEU*     1.3    76.9    -      -       -      +
    439A  LEU*     1.3    56.7    -      -       -      +
    441A  SER*     3.9     4.3    -      -       -      -
    442A  ALA*     3.1    32.6    +      -       -      +
    511A  LEU*     3.3    30.5    -      -       +      +
    512A  ILE*     4.9     4.7    -      -       +      -
    513A  THR      3.3    28.7    -      -       -      +
    515A  ARG*     4.0    12.7    +      -       +      -
    518A  LEU*     4.1    13.2    -      -       +      -
    524A  VAL*     4.2    16.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 439 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    414A  LEU*     4.8     9.2    -      -       +      +
    417A  ILE*     3.9    21.7    -      -       +      +
    418A  ARG*     3.6    46.2    -      -       +      +
    421A  ALA*     3.8    22.2    -      -       +      -
    422A  GLU*     5.0     3.6    -      -       -      +
    427A  PHE*     4.1    17.9    -      -       +      -
    435A  GLN*     3.0    23.8    +      -       +      +
    436A  ASP*     3.8     4.7    -      -       -      +
    438A  LEU*     1.3    75.8    -      -       -      +
    440A  GLU*     1.3    64.6    +      -       +      +
    442A  ALA      3.8     0.7    -      -       -      -
    443A  PHE*     3.1    26.5    +      -       -      +
    446A  LEU*     5.3     0.6    -      -       +      +
    511A  LEU*     3.8    13.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 440 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418A  ARG*     6.3     1.1    -      -       -      +
    436A  ASP*     2.9    28.9    +      -       +      +
    437A  LEU*     3.3    10.5    +      -       +      +
    439A  LEU*     1.3    75.9    -      -       +      +
    441A  SER*     1.3    65.1    -      -       -      +
    442A  ALA      3.4     0.3    +      -       -      -
    443A  PHE      3.6     5.9    +      -       -      -
    444A  LEU      5.1     0.7    +      -       -      -
    587A  ILE*     6.0     1.6    -      -       +      +
    590A  LYS*     3.3    29.3    +      -       -      +
    591A  ILE*     3.5    50.7    -      -       +      +
    594A  ASP*     2.7    33.3    -      -       -      +
    595A  THR*     3.6     8.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 441 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    437A  LEU*     2.6    31.2    +      -       -      +
    438A  LEU      3.9     1.1    -      -       -      -
    440A  GLU*     1.3    78.4    -      -       -      +
    442A  ALA*     1.3    59.7    +      -       -      +
    443A  PHE      3.8     0.2    +      -       -      -
    444A  LEU*     5.3     0.9    +      -       -      +
    445A  GLU*     4.9     4.7    +      -       -      +
    515A  ARG*     3.2    49.6    +      -       -      +
    595A  THR*     4.2    12.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 442 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    438A  LEU      3.1    18.8    +      -       -      +
    439A  LEU      3.8     0.9    -      -       -      +
    441A  SER*     1.3    79.8    -      -       -      +
    443A  PHE*     1.3    57.6    +      -       -      +
    444A  LEU      3.6     1.3    -      -       -      -
    445A  GLU*     3.6     7.0    +      -       -      +
    446A  LEU*     2.8    50.1    +      -       +      +
    510A  VAL*     3.8    15.3    -      -       +      +
    511A  LEU*     3.8     7.2    -      -       +      -
    515A  ARG*     3.7    15.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 443 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    410A  LEU*     3.3    39.7    -      -       +      -
    413A  SER*     3.9     6.3    -      -       -      -
    414A  LEU*     3.4    43.7    -      -       +      -
    417A  ILE*     3.8    20.2    -      -       +      -
    439A  LEU      3.1    17.9    +      -       -      +
    440A  GLU      3.6     8.8    +      -       -      +
    441A  SER      3.5     2.8    -      -       -      -
    442A  ALA*     1.3    78.0    -      -       -      +
    444A  LEU*     1.3    67.0    +      -       +      +
    446A  LEU*     3.0     7.0    +      -       -      +
    447A  PHE*     2.7    39.9    +      -       +      +
    588A  ILE*     4.0    17.5    -      -       +      -
    591A  ILE*     4.2    19.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 444 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    410A  LEU*     4.6    14.6    -      -       +      -
    440A  GLU      5.1     0.6    +      -       -      -
    441A  SER      5.3     1.0    +      -       -      +
    443A  PHE*     1.3    88.5    -      -       +      +
    445A  GLU*     1.3    63.4    +      -       -      +
    447A  PHE*     3.2     5.6    +      -       +      +
    448A  ILE*     3.0    34.1    +      -       +      +
    482A  TRP*     3.9    29.2    -      -       +      -
    566A  CYS*     3.7    29.8    -      -       +      +
    569A  GLY*     4.3     2.2    -      -       -      -
    570A  LEU*     3.8    32.8    -      -       +      +
    573A  ILE*     5.0    11.9    -      -       +      -
    591A  ILE*     5.7     6.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 445 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    441A  SER      4.9     3.9    +      -       -      +
    442A  ALA*     3.6     8.4    +      -       -      +
    443A  PHE      3.2     0.6    -      -       -      -
    444A  LEU*     1.3    77.8    -      -       -      +
    446A  LEU*     1.3    62.8    +      -       -      +
    448A  ILE*     3.8     3.0    -      -       -      +
    449A  LEU*     3.1    23.6    +      -       +      +
    510A  VAL*     3.8    27.6    -      -       +      +
    515A  ARG*     4.1    15.4    +      -       -      -
    559A  LEU*     4.1    12.6    -      -       -      +
    562A  LEU*     3.6    34.9    -      -       +      +
    563A  ARG*     5.4     6.1    -      -       -      +
    566A  CYS*     3.6    22.5    -      -       -      -
    601A  T94      4.7     3.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 446 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    417A  ILE*     4.0    22.9    -      -       +      -
    420A  TRP*     3.7    29.4    -      -       +      -
    439A  LEU*     5.3     1.1    -      -       +      +
    442A  ALA*     2.8    38.6    +      -       +      +
    443A  PHE*     3.5     4.0    -      -       -      +
    445A  GLU*     1.3    74.8    -      -       -      +
    447A  PHE*     1.3    63.7    +      -       -      +
    449A  LEU*     4.6     4.3    -      -       +      -
    450A  ARG*     2.9    39.2    +      -       +      +
    507A  SER*     3.4    34.8    -      -       -      +
    510A  VAL*     3.7    17.5    -      -       +      -
    511A  LEU*     4.1    10.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 447 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    409A  LEU      4.2     9.2    -      -       -      -
    410A  LEU*     3.7    33.2    -      -       +      -
    413A  SER*     3.3    35.0    -      -       -      -
    417A  ILE*     4.2     3.0    -      -       -      +
    443A  PHE*     2.7    26.6    +      +       +      +
    444A  LEU*     3.4    11.2    -      -       +      +
    446A  LEU*     1.3    71.8    -      -       -      +
    448A  ILE*     1.3    70.7    +      -       +      +
    450A  ARG*     4.3     2.4    -      -       -      +
    451A  LEU*     3.0    55.3    +      -       +      +
    454A  ARG*     5.5     1.1    +      -       -      -
    464A  PHE*     4.6    12.6    -      +       -      -
    479A  PHE*     4.3    19.3    -      +       -      -
    482A  TRP*     4.1    16.6    -      +       -      -
    486A  ILE*     5.1     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 448 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    444A  LEU*     3.0    21.9    +      -       +      +
    445A  GLU      3.8     3.4    -      -       -      +
    447A  PHE*     1.3    81.0    -      -       +      +
    449A  LEU*     1.3    61.0    +      -       -      +
    451A  LEU*     3.7     5.3    -      -       -      +
    452A  ALA*     2.8    28.9    +      -       -      +
    482A  TRP*     3.8    24.2    -      -       +      +
    486A  ILE*     4.4    12.9    -      -       +      +
    489A  PHE*     4.6     4.0    -      -       +      -
    562A  LEU*     3.6    17.7    -      -       +      -
    565A  LEU*     3.7    31.2    -      -       +      +
    566A  CYS*     3.6    41.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 449 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    445A  GLU      3.1    16.3    +      -       -      +
    446A  LEU*     3.4     6.9    +      -       +      +
    448A  ILE*     1.3    82.6    -      -       -      +
    450A  ARG*     1.3    58.5    +      -       +      +
    452A  ALA*     3.4     3.7    +      -       -      +
    453A  TYR*     3.0    28.1    +      -       -      +
    489A  PHE*     4.1    15.7    -      -       +      -
    493A  LEU*     4.0    18.6    -      -       +      -
    503A  PHE*     3.6    28.7    -      -       +      -
    506A  LEU*     5.2     1.1    -      -       +      -
    507A  SER*     4.5    13.5    -      -       -      +
    510A  VAL*     4.1    25.6    -      -       +      -
    562A  LEU*     4.5     8.1    -      -       +      -
    601A  T94      4.5    22.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 450 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    372A  HIS*     4.5     5.9    +      -       -      -
    375A  SER*     3.2    44.2    +      -       -      -
    413A  SER*     4.8     3.4    +      -       -      -
    416A  VAL*     3.7    15.4    -      -       -      +
    417A  ILE*     3.8    20.5    -      -       -      +
    420A  TRP*     4.3    20.7    -      -       -      +
    446A  LEU*     2.9    40.2    +      -       +      +
    447A  PHE*     4.3     2.0    -      -       -      +
    449A  LEU*     1.3    77.4    -      -       +      +
    451A  LEU*     1.3    62.2    +      -       -      +
    453A  TYR*     3.4     2.9    +      -       -      +
    454A  ARG*     3.1    51.6    +      -       -      +
    465A  CYS*     4.3     2.6    -      -       -      +
    503A  PHE*     4.0    22.9    -      -       +      -
    507A  SER*     5.1     6.8    -      -       -      -
    607A  GOL      3.8    12.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 451 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    447A  PHE*     3.0    47.6    +      -       +      +
    448A  ILE*     3.7     2.9    -      -       -      +
    450A  ARG*     1.3    76.0    -      -       -      +
    452A  ALA*     1.3    59.6    +      -       -      +
    454A  ARG*     3.6    11.5    -      -       -      +
    455A  SER*     2.5    47.3    +      -       -      +
    462A  LEU*     4.4    10.8    -      -       +      -
    463A  ILE      3.0    31.6    -      -       -      +
    464A  PHE*     3.7    27.8    -      -       +      -
    479A  PHE*     5.4     0.4    -      -       +      -
    483A  ILE*     4.7     2.7    -      -       +      -
    486A  ILE*     4.1    26.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 452 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    448A  ILE      2.8    19.2    +      -       -      +
    449A  LEU      3.8     3.8    -      -       -      +
    451A  LEU*     1.3    78.4    -      -       -      +
    453A  TYR*     1.3    62.2    +      -       -      +
    454A  ARG      3.4     0.2    +      -       -      -
    455A  SER*     3.7     1.7    +      -       -      -
    486A  ILE*     4.3    10.7    -      -       +      +
    489A  PHE*     3.6    29.8    -      -       +      -
    490A  SER*     2.5    43.3    +      -       -      +
    493A  LEU*     4.3     3.1    -      -       +      -
    494A  HIS*     3.5     5.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 453 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    372A  HIS*     4.2    14.4    -      +       -      -
    449A  LEU      3.0    18.0    +      -       -      +
    450A  ARG      3.8     3.4    -      -       -      +
    452A  ALA*     1.3    77.6    -      -       -      +
    454A  ARG*     1.3    60.4    +      -       +      +
    493A  LEU*     3.9    19.5    -      -       +      +
    494A  HIS*     3.1    27.0    +      +       -      -
    498A  VAL*     2.5    37.3    +      -       +      -
    499A  ASP*     3.6     1.0    -      -       -      -
    500A  VAL*     3.5    27.8    +      -       +      +
    503A  PHE*     3.6    52.9    -      +       +      -
    607A  GOL      5.7     3.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 454 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    377A  PRO*     4.3     4.9    -      -       +      -
    413A  SER*     5.5     2.6    +      -       -      -
    447A  PHE*     5.5     0.8    +      -       -      -
    450A  ARG*     3.1    44.2    +      -       -      +
    451A  LEU*     3.6    23.0    -      -       -      +
    452A  ALA      3.2     0.2    -      -       -      -
    453A  TYR*     1.3    79.3    -      -       +      +
    455A  SER*     1.3    65.8    +      -       -      +
    456A  LYS*     4.6     4.5    +      -       -      +
    463A  ILE*     3.0    57.1    +      -       +      +
    464A  PHE*     3.6     7.7    -      -       -      +
    465A  CYS*     3.5    29.3    -      -       -      +
    607A  GOL      3.0    43.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 455 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    451A  LEU*     2.5    30.3    +      -       -      +
    452A  ALA*     3.7     1.3    +      -       -      -
    453A  TYR      3.5     0.6    -      -       -      -
    454A  ARG*     1.3    81.5    -      -       -      +
    456A  LYS*     1.3    64.3    +      -       -      +
    457A  PRO*     3.7     2.7    -      -       -      -
    461A  LYS      3.5    12.1    -      -       -      -
    462A  LEU*     3.5    12.6    -      -       -      +
    463A  ILE*     3.1    23.9    +      -       -      +
    486A  ILE*     6.5     0.2    -      -       -      -
    487A  LEU*     4.6     6.3    -      -       -      -
    490A  SER*     4.3     8.5    -      -       -      -
    494A  HIS*     3.0    24.0    -      -       -      -
----------------------------------------------------------
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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