Contacts of the helix formed by residues 469 - 498 (chain A) in PDB entry 5MKF


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 PHE 469 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    236A  ILE*     4.2    20.6    -      -       +      -
    239A  TYR*     5.6     8.7    -      +       -      -
    240A  GLY*     4.0    27.8    -      -       -      -
    466A  VAL*     3.6     4.3    +      -       +      +
    468A  THR*     1.3    84.5    -      -       +      +
    470A  ASP*     1.3    64.8    +      -       -      +
    471A  PHE      3.5     0.9    -      -       -      -
    472A  PHE*     3.2    32.3    +      +       +      +
    473A  LEU*     3.2    32.6    +      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 470 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    461A  LYS*     5.3     1.7    +      -       -      -
    464A  ARG*     2.9    28.4    +      -       -      +
    465A  TYR*     3.0    21.5    -      -       -      -
    466A  VAL*     3.2    30.0    +      -       +      +
    469A  PHE*     1.3    75.2    -      -       -      +
    471A  PHE*     1.3    57.5    +      -       +      +
    472A  PHE      2.9     4.9    -      -       -      -
    473A  LEU*     2.5    26.0    +      -       -      +
    474A  ALA*     2.4    54.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 471 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    465A  TYR*     5.4    17.9    -      +       +      -
    466A  VAL      4.2     2.7    -      -       -      -
    467A  THR*     3.3    52.0    -      -       +      -
    468A  THR      4.8     3.1    -      -       -      +
    469A  PHE      3.5     0.4    -      -       -      -
    470A  ASP*     1.3    77.3    -      -       +      +
    472A  PHE*     1.3    65.2    +      -       +      +
    474A  ALA*     4.6     3.1    -      -       +      +
    475A  ALA*     3.1    28.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 472 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    468A  THR      4.8     8.5    -      -       -      -
    469A  PHE*     3.2    36.6    +      +       +      +
    470A  ASP      2.9     0.6    -      -       -      -
    471A  PHE*     1.3    84.5    -      -       +      +
    473A  LEU*     1.3    60.1    +      -       -      +
    475A  ALA*     4.2     1.7    -      -       -      +
    476A  CYS*     3.0    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 473 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    236A  ILE*     4.4    17.9    -      -       +      -
    237A  LEU*     4.1    34.3    -      -       +      -
    240A  GLY      4.4     4.9    -      -       -      +
    241A  MET*     3.8    30.5    -      -       +      +
    461A  LYS*     4.1    11.0    -      -       -      +
    464A  ARG*     6.2     1.8    -      -       -      +
    469A  PHE*     3.2    23.3    +      -       +      +
    470A  ASP*     2.5    26.4    +      -       -      +
    472A  PHE*     1.3    73.4    -      -       -      +
    474A  ALA*     1.3    52.8    +      -       -      +
    476A  CYS*     2.9     8.8    +      -       +      +
    477A  GLU*     2.4    38.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 474 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    464A  ARG*     5.3     3.6    -      -       +      +
    465A  TYR*     4.2    15.3    -      -       +      -
    470A  ASP*     2.4    48.8    +      -       -      +
    471A  PHE*     4.9     3.1    -      -       +      -
    473A  LEU*     1.3    71.2    -      -       -      +
    475A  ALA*     1.3    60.3    +      -       -      +
    477A  GLU*     3.0    25.6    +      -       +      +
    478A  ILE*     3.0    14.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 475 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    471A  PHE*     3.1    24.6    +      -       -      +
    472A  PHE*     4.2     2.0    -      -       -      +
    473A  LEU      3.3     0.6    -      -       -      -
    474A  ALA*     1.3    77.5    -      -       -      +
    476A  CYS*     1.3    57.1    +      -       -      +
    478A  ILE*     3.1    26.4    -      -       +      +
    479A  ILE*     3.1    16.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 476 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    233A  VAL*     3.7    33.2    -      -       -      -
    236A  ILE*     5.2    12.6    -      -       +      -
    237A  LEU*     5.3     5.1    -      -       -      +
    472A  PHE      3.0    18.5    +      -       -      +
    473A  LEU*     2.9    11.4    +      -       +      +
    475A  ALA*     1.3    74.2    -      -       -      +
    477A  GLU*     1.3    58.5    +      -       -      +
    478A  ILE      3.4     0.2    -      -       -      -
    479A  ILE*     3.2    19.8    +      -       +      +
    480A  PHE*     2.9    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 477 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    237A  LEU*     6.0     6.3    -      -       +      -
    464A  ARG*     4.2    22.9    +      -       -      +
    473A  LEU*     2.4    29.7    +      -       +      +
    474A  ALA*     3.1    19.9    -      -       -      +
    476A  CYS*     1.3    69.0    -      -       -      +
    478A  ILE*     1.3    78.2    +      -       -      +
    480A  PHE*     2.9    31.0    +      -       +      +
    481A  CYS*     3.2    15.8    +      -       -      +
    525A  ASN*     5.1     6.6    +      -       -      +
    526A  ILE*     3.8    25.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 478 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    474A  ALA      3.0     7.0    +      -       -      +
    475A  ALA*     3.1    24.5    -      -       -      +
    477A  GLU*     1.3    90.3    +      -       -      +
    479A  ILE*     1.3    65.1    +      -       +      +
    481A  CYS*     3.2    23.5    -      -       -      -
    482A  PHE*     3.0    23.4    +      -       +      +
    526A  ILE*     5.8     5.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 479 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    233A  VAL*     5.9     4.9    -      -       +      -
    475A  ALA*     3.1    20.2    -      -       +      +
    476A  CYS*     3.2    25.5    +      -       +      +
    477A  GLU      3.1     0.2    -      -       -      -
    478A  ILE*     1.3    82.5    -      -       +      +
    480A  PHE*     1.3    52.0    +      -       -      +
    482A  PHE*     3.2    11.8    +      -       +      +
    483A  PHE*     2.6    41.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 480 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    230A  PHE*     3.4    23.1    -      +       -      -
    233A  VAL*     4.5    15.3    -      -       +      -
    234A  LEU*     3.4    35.0    -      -       +      -
    237A  LEU*     5.3     9.9    -      -       +      -
    476A  CYS      2.9    11.9    +      -       -      +
    477A  GLU*     2.9    16.5    +      -       +      +
    479A  ILE*     1.3    77.0    -      -       -      +
    481A  CYS*     1.3    62.2    +      -       +      +
    483A  PHE*     2.7    25.0    +      -       -      +
    484A  ILE*     3.0    44.3    +      -       +      +
    518A  SER*     5.4     8.7    -      -       -      -
    522A  ILE*     5.0    14.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 481 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    477A  GLU*     3.2    13.4    +      -       -      +
    478A  ILE*     3.2    46.7    -      -       -      -
    480A  PHE*     1.3    86.8    -      -       +      +
    482A  PHE*     1.3    59.3    +      -       -      +
    484A  ILE*     4.2     5.3    -      -       -      +
    485A  PHE*     3.3    21.3    +      -       -      +
    522A  ILE*     4.6    26.0    -      -       +      +
    526A  ILE*     5.8     3.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 482 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    478A  ILE*     3.0    20.5    +      -       +      +
    479A  ILE*     3.4    12.3    -      -       +      +
    481A  CYS*     1.3    77.1    -      -       -      +
    483A  PHE*     1.3    71.8    +      +       +      +
    485A  PHE*     3.0    32.9    +      +       -      +
    486A  TYR*     3.1    19.7    +      +       +      +
----------------------------------------------------------
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Residues in contact with PHE 483 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    226A  THR*     3.5    44.0    -      -       +      -
    227A  TYR*     4.2     4.0    -      +       -      -
    229A  LEU*     6.1     3.8    -      -       +      -
    230A  PHE*     3.3    50.7    -      +       +      -
    233A  VAL*     6.4     1.3    -      -       +      -
    479A  ILE*     2.6    28.3    +      -       +      +
    480A  PHE*     2.7    13.0    +      -       -      +
    482A  PHE*     1.3    78.8    -      +       +      +
    484A  ILE*     1.3    65.7    +      -       +      +
    486A  TYR*     3.0    25.1    -      +       +      +
    487A  TYR*     3.6    20.0    +      +       -      -
----------------------------------------------------------
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Residues in contact with ILE 484 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    230A  PHE*     3.8    17.5    -      -       +      -
    480A  PHE*     3.0    70.4    +      -       +      +
    481A  CYS*     4.4     3.4    -      -       -      +
    483A  PHE*     1.3    73.7    -      -       +      +
    485A  PHE*     1.3    56.4    +      -       -      +
    486A  TYR      3.0     2.0    -      -       -      -
    487A  TYR*     2.8     8.9    +      -       +      +
    488A  VAL*     2.5    52.6    +      -       +      +
    515A  VAL*     5.1    10.5    -      -       +      -
    518A  SER*     4.3    21.3    -      -       -      +
    519A  VAL*     5.2     0.7    -      -       +      -
    522A  ILE*     4.4    14.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 485 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    481A  CYS      3.3    14.4    +      -       -      +
    482A  PHE*     3.0    30.8    +      +       -      +
    484A  ILE*     1.3    77.0    -      -       -      +
    486A  TYR*     1.3    67.0    +      -       -      +
    488A  VAL*     3.4    28.0    +      -       +      +
    489A  VAL*     3.6    22.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 486 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    222A  ARG*     5.2    13.6    +      -       -      +
    223A  GLU*     6.2     0.3    -      -       -      +
    226A  THR*     5.0     8.4    -      -       +      +
    482A  PHE*     3.1    17.8    +      +       +      +
    483A  PHE*     3.0    19.3    -      +       +      +
    484A  ILE      2.9     0.4    +      -       -      -
    485A  PHE*     1.3    82.6    -      -       -      +
    487A  TYR*     1.3   104.6    -      +       -      +
    488A  VAL      3.0     1.0    +      -       -      -
    489A  VAL*     3.2     1.6    +      -       -      +
    490A  GLU*     3.0    46.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 487 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    223A  GLU*     3.4    24.8    +      -       +      +
    226A  THR*     2.6    36.7    +      -       -      +
    227A  TYR*     3.3    31.4    -      +       -      +
    483A  PHE*     3.6    21.9    +      +       -      +
    484A  ILE*     2.8    12.9    +      -       +      +
    486A  TYR*     1.3   108.7    -      +       -      +
    488A  VAL*     1.3    66.1    +      -       -      +
    490A  GLU*     3.9    17.9    -      -       -      -
    491A  GLU*     2.7    64.1    -      -       +      +
    515A  VAL*     5.6     2.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 488 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    484A  ILE*     2.5    44.5    +      -       +      +
    485A  PHE*     3.4    21.5    -      -       +      +
    486A  TYR      3.0     0.4    +      -       -      -
    487A  TYR*     1.3    75.7    -      -       -      +
    489A  VAL*     1.3    68.7    +      -       +      +
    491A  GLU*     4.3     0.8    -      -       -      +
    492A  ILE*     3.1    37.9    +      -       +      +
    515A  VAL*     4.8    16.1    -      -       +      +
    519A  VAL*     5.0     9.4    -      -       +      -
    522A  ILE*     5.9     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 489 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    485A  PHE*     4.2    25.1    -      -       +      +
    486A  TYR      3.2     4.8    +      -       -      +
    488A  VAL*     1.3    82.5    -      -       +      +
    490A  GLU*     1.3    68.1    +      -       -      +
    491A  GLU      3.1     2.2    -      -       -      -
    492A  ILE*     3.0    20.8    +      -       +      +
    493A  LEU*     3.2    27.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 490 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    223A  GLU*     4.9    10.0    -      -       -      +
    486A  TYR*     3.0    46.7    +      -       +      +
    487A  TYR*     3.9    17.6    -      -       +      -
    489A  VAL*     1.3    77.4    -      -       -      +
    491A  GLU*     1.3    72.8    +      -       -      +
    493A  LEU*     3.7    26.1    +      -       +      +
    494A  GLU*     4.3    12.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 491 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    227A  TYR*     2.9    26.9    +      -       -      -
    487A  TYR*     2.7    42.6    +      -       +      +
    488A  VAL      4.3     0.9    -      -       -      +
    489A  VAL      3.1     0.8    -      -       -      -
    490A  GLU*     1.3    78.1    -      -       -      +
    492A  ILE*     1.3    66.2    +      -       +      +
    493A  LEU      3.2     2.4    +      -       -      -
    494A  GLU*     3.5     9.9    +      -       -      +
    495A  ILE*     3.2    23.0    +      -       +      +
    511A  ASP      5.1     4.3    -      -       -      +
    515A  VAL*     3.3    28.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 492 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    488A  VAL*     3.1    31.4    -      -       +      +
    489A  VAL*     3.0    12.8    +      -       +      +
    491A  GLU*     1.3    76.6    -      -       +      +
    493A  LEU*     1.3    56.9    +      -       +      +
    495A  ILE*     2.8    18.2    +      -       +      +
    496A  ARG*     2.7    46.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 493 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    489A  VAL*     3.2    27.4    +      -       +      +
    490A  GLU*     3.7    22.0    -      -       +      +
    491A  GLU      3.2     0.6    -      -       -      -
    492A  ILE*     1.3    76.5    -      -       +      +
    494A  GLU*     1.3    60.7    +      -       +      +
    496A  ARG*     3.1    41.3    -      -       -      +
    497A  ILE*     2.9    38.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 494 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    490A  GLU*     5.1    12.4    -      -       -      +
    491A  GLU*     3.5    11.1    +      -       -      +
    492A  ILE      3.3     0.2    -      -       -      -
    493A  LEU*     1.3    76.8    -      -       +      +
    495A  ILE*     1.3    63.9    +      -       +      +
    497A  ILE*     4.5     1.6    -      -       -      +
    498A  HIS*     2.8    52.4    +      -       +      +
    501A  HIS*     6.2     3.8    -      -       +      -
    502A  TYR*     4.2     2.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 495 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    491A  GLU*     3.2    18.6    -      -       +      +
    492A  ILE*     2.8    22.4    +      -       +      +
    494A  GLU*     1.3    79.5    -      -       +      +
    496A  ARG*     1.3    60.9    +      -       -      +
    498A  HIS      3.2    11.6    -      -       -      +
    499A  LYS*     4.2     2.8    -      -       -      +
    502A  TYR*     3.5    49.8    +      -       +      +
    508A  ASN*     5.3     4.7    -      -       -      +
    512A  VAL*     5.0    16.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 496 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    492A  ILE*     2.7    24.7    +      -       +      +
    493A  LEU*     3.1    42.3    -      -       -      +
    495A  ILE*     1.3    76.4    -      -       -      +
    497A  ILE*     1.3   102.2    +      -       -      +
    498A  HIS      4.5     1.4    -      -       -      -
    499A  LYS*     4.6     3.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 497 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    493A  LEU*     2.9    26.4    +      -       +      +
    494A  GLU*     4.6     0.7    -      -       +      -
    496A  ARG*     1.3   118.5    -      -       -      +
    498A  HIS*     1.3    79.9    +      -       +      +
    499A  LYS*     3.6     3.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 498 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    494A  GLU*     2.8    42.3    +      -       +      +
    495A  ILE      3.2     2.4    -      -       -      +
    497A  ILE*     1.3    91.9    -      -       +      +
    499A  LYS*     1.3    61.4    +      -       -      +
    500A  LEU      3.6     0.4    -      -       -      +
    501A  HIS*     3.4    44.9    -      +       +      -
    502A  TYR*     3.0    19.0    -      -       +      +
----------------------------------------------------------
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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