Contacts of the helix formed by residues 503 - 529 (chain A) in PDB entry 6HBU


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 ALA 503 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    502A  LYS*     1.3    75.7    -      -       -      +
    504A  ASP*     1.3    65.8    +      -       -      +
    506A  PHE*     3.5     9.8    +      -       -      +
    507A  PHE*     3.2    28.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 504 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    502A  LYS*     3.5    31.1    +      -       -      +
    503A  ALA*     1.3    73.5    -      -       -      +
    505A  ALA*     1.3    68.2    +      -       -      +
    507A  PHE*     3.1     9.4    +      -       -      +
    508A  VAL*     2.9    35.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 505 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    500A  LYS*     3.7    38.4    -      -       +      +
    502A  LYS*     4.3     7.4    +      -       +      -
    503A  ALA      3.4     0.4    -      -       -      -
    504A  ASP*     1.3    85.1    +      -       -      +
    506A  PHE*     1.3    63.3    +      -       -      +
    508A  VAL*     4.0     2.2    -      -       -      -
    509A  MET*     3.3     9.7    +      -       -      +
    584A  ASN*     3.1    42.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 506 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    490A  THR*     3.7    30.0    -      -       +      +
    491A  CYS*     3.6    29.4    -      -       -      -
    494A  TYR*     3.6    44.2    -      +       +      -
    500A  LYS      5.1     0.6    +      -       -      -
    502A  LYS      3.9    11.5    +      -       -      +
    503A  ALA*     3.5    10.4    +      -       -      +
    504A  ASP      3.2     0.4    -      -       -      -
    505A  ALA*     1.3    78.9    -      -       -      +
    507A  PHE*     1.3    85.4    +      +       -      +
    509A  MET*     3.4     8.1    +      -       -      +
    510A  MET*     2.9    46.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 507 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    503A  ALA*     3.2    29.4    -      -       +      -
    504A  ASP*     3.1     8.1    +      -       -      +
    506A  PHE*     1.3    99.8    -      +       -      +
    508A  VAL*     1.3    61.6    +      -       +      +
    510A  MET*     3.6    22.0    -      -       +      +
    511A  PHE*     2.8    29.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 508 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    504A  ASP*     2.9    26.2    +      -       +      +
    505A  ALA*     4.6     0.7    -      -       -      -
    507A  PHE*     1.3    74.6    -      -       +      +
    509A  MET*     1.3    54.9    +      -       -      +
    511A  PHE*     3.8     5.5    -      -       -      +
    512A  THR*     2.5    43.8    +      -       -      +
    584A  ASN*     3.4    26.9    -      -       -      +
    626A  LEU*     3.9    28.3    -      -       +      -
    627A  TRP*     4.1    26.0    -      -       +      -
    630A  HIS*     4.4     1.1    +      -       +      -
----------------------------------------------------------
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Residues in contact with MET 509 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    430A  LEU*     5.2     2.9    -      -       +      -
    433A  LEU*     3.7    30.7    -      -       +      -
    490A  THR*     3.9    19.1    -      -       +      +
    493A  VAL*     3.7    23.6    -      -       +      -
    494A  TYR*     5.4     8.1    -      -       -      -
    499A  LEU*     3.7    24.7    -      -       +      -
    505A  ALA      3.3    16.9    +      -       -      +
    506A  PHE*     3.5     5.6    -      -       -      +
    507A  PHE      3.3     0.2    -      -       -      -
    508A  VAL*     1.3    74.2    -      -       -      +
    510A  MET*     1.3    64.2    +      -       -      +
    512A  THR*     3.3     0.7    +      -       -      -
    513A  LEU*     3.1    32.1    +      -       +      +
    581A  LEU*     4.0    19.1    -      -       +      -
    584A  ASN*     3.2    13.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 510 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    486A  SER      4.1    10.0    -      -       -      +
    487A  ILE*     3.8    44.6    -      -       +      +
    490A  THR*     3.8    14.3    -      -       +      +
    491A  CYS*     4.2     2.0    -      -       -      -
    506A  PHE*     2.9    48.5    +      -       +      +
    507A  PHE*     3.8    23.8    -      -       +      +
    508A  VAL      3.4     0.2    -      -       -      -
    509A  MET*     1.3    76.7    -      -       -      +
    511A  PHE*     1.3    61.8    +      -       -      +
    513A  LEU*     3.5     2.3    +      -       -      +
    514A  MET*     3.2    40.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 511 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    507A  PHE      2.8    19.2    +      -       -      +
    508A  VAL*     3.9     4.5    -      -       -      +
    509A  MET      3.3     0.2    -      -       -      -
    510A  MET*     1.3    76.9    -      -       -      +
    512A  THR*     1.3    61.6    +      -       -      +
    514A  MET*     3.4    16.4    +      -       +      +
    515A  MET*     3.1    50.6    +      -       +      +
    627A  TRP*     3.6    31.9    -      +       +      -
    630A  HIS*     3.5    28.0    -      +       +      -
----------------------------------------------------------
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Residues in contact with THR 512 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    434A  THR*     6.1     0.2    -      -       +      -
    508A  VAL*     2.5    26.3    +      -       -      +
    509A  MET*     3.7     4.7    -      -       -      -
    510A  MET      3.3     0.4    -      -       -      -
    511A  PHE*     1.3    77.3    -      -       -      +
    513A  LEU*     1.3    60.5    +      -       -      +
    515A  MET*     3.3     2.8    +      -       -      +
    516A  VAL*     3.2    25.0    +      -       +      +
    577A  GLY*     3.7    30.5    -      -       -      +
    580A  ALA*     3.8    13.5    +      -       +      +
    581A  LEU*     3.9    17.7    -      -       +      +
    630A  HIS*     2.7    32.4    +      -       +      +
    633A  LEU*     5.5     2.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 513 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    433A  LEU*     4.3    15.3    -      -       +      +
    434A  THR*     5.6     0.7    -      -       +      -
    437A  GLN*     3.2    33.2    +      -       +      +
    486A  SER*     4.1     6.5    -      -       -      +
    489A  PHE*     3.6    35.4    -      -       +      -
    490A  THR*     3.7    20.6    -      -       -      +
    509A  MET*     3.1    34.7    +      -       +      +
    510A  MET      4.1     3.4    -      -       -      +
    511A  PHE      3.4     0.2    -      -       -      -
    512A  THR*     1.3    74.3    -      -       -      +
    514A  MET*     1.3    62.4    +      -       -      +
    516A  VAL*     3.5     9.5    -      -       +      +
    517A  ALA*     3.3    11.1    +      -       -      +
    581A  LEU*     3.7    33.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 514 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    482A  ARG      4.7     5.4    -      -       -      +
    483A  MET*     4.0    26.2    -      -       +      +
    486A  SER*     3.8    17.7    -      -       -      -
    487A  ILE*     3.7    31.9    -      -       +      +
    510A  MET*     3.2    32.2    +      -       +      +
    511A  PHE*     3.7    19.5    -      -       +      +
    512A  THR      3.3     0.2    -      -       -      -
    513A  LEU*     1.3    76.8    -      -       -      +
    515A  MET*     1.3    60.7    +      -       +      +
    517A  ALA*     3.1     3.6    +      -       -      +
    518A  TYR*     2.8    51.0    +      -       +      -
----------------------------------------------------------
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Residues in contact with MET 515 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    511A  PHE*     3.1    51.8    +      -       +      +
    512A  THR      3.3     3.5    +      -       -      +
    514A  MET*     1.3    76.2    -      -       +      +
    516A  VAL*     1.3    59.5    +      -       -      +
    518A  TYR*     4.1    12.2    -      -       -      +
    519A  SER*     2.7    34.5    +      -       -      -
    630A  HIS*     3.6    29.2    -      -       +      +
    633A  LEU*     3.8    17.7    -      -       +      +
    634A  ALA*     3.6    27.8    -      -       +      +
    637A  ILE*     3.8    16.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 516 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    434A  THR*     4.8    13.7    -      -       +      +
    437A  GLN*     3.7    21.7    -      -       +      +
    438A  CYS*     4.4     7.5    -      -       -      -
    512A  THR*     3.2    15.8    +      -       +      +
    513A  LEU*     3.5    14.4    -      -       +      +
    515A  MET*     1.3    74.9    -      -       -      +
    517A  ALA*     1.3    64.4    +      -       -      +
    519A  SER      4.0     0.4    -      -       -      -
    520A  ALA*     3.3    24.4    +      -       -      +
    573A  ILE*     4.0    24.6    -      -       +      +
    577A  GLY*     3.6    30.3    -      -       -      -
    633A  LEU*     3.7    14.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 517 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    437A  GLN*     3.6    29.6    -      -       -      +
    441A  SER*     3.3     2.1    +      -       -      +
    482A  ARG*     3.7    20.7    -      -       +      +
    486A  SER*     4.0     5.6    -      -       -      +
    513A  LEU      3.3    18.8    +      -       -      +
    514A  MET      3.1     5.9    +      -       -      +
    516A  VAL*     1.3    77.6    -      -       -      +
    518A  TYR*     1.3    57.9    +      -       -      +
    521A  SER*     2.7    35.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 518 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    478A  LEU*     3.4    35.3    -      -       +      +
    482A  ARG*     3.6    31.9    -      -       +      -
    483A  MET*     3.3    42.8    -      -       +      +
    514A  MET*     2.8    36.9    +      -       +      +
    515A  MET*     4.1    10.1    -      -       -      +
    517A  ALA*     1.3    76.8    -      -       -      +
    519A  SER*     1.3    58.3    +      -       -      +
    521A  SER*     3.4     3.7    +      -       -      -
    522A  SER*     2.8    35.4    +      -       -      +
    637A  ILE*     3.7    26.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 519 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    515A  MET      2.7    22.7    +      -       -      -
    518A  TYR*     1.3    76.3    -      -       -      +
    520A  ALA*     1.3    59.0    +      -       -      +
    522A  SER*     3.6     4.0    +      -       -      -
    523A  MET*     3.2    19.6    +      -       -      +
    573A  ILE*     3.5    22.4    -      -       -      +
    633A  LEU*     3.0    45.6    +      -       -      +
    636A  MET*     4.6     7.4    -      -       -      -
    637A  ILE*     3.3     9.8    -      -       -      +
    640A  PHE*     3.9     4.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 520 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    438A  CYS*     3.8    10.8    -      -       +      +
    441A  SER*     3.6    17.2    -      -       -      +
    516A  VAL      3.3    18.6    +      -       -      +
    518A  TYR      3.3     0.2    -      -       -      -
    519A  SER*     1.3    77.6    -      -       -      +
    521A  SER*     1.3    59.8    +      -       -      +
    523A  MET*     3.9     2.2    -      -       -      +
    524A  ALA*     3.2    17.8    +      -       -      +
    541A  MET*     3.3    12.5    -      -       -      +
    545A  PHE*     3.6    27.4    -      -       +      -
    573A  ILE*     3.9    12.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 521 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    441A  SER*     3.1     8.7    +      -       -      -
    444A  ALA*     4.1    11.3    -      -       -      +
    477A  ASP*     4.5     4.5    -      -       -      -
    482A  ARG*     2.9    30.9    +      -       -      +
    517A  ALA      2.7    23.6    +      -       -      -
    518A  TYR*     3.8     5.6    -      -       -      -
    520A  ALA*     1.3    77.2    -      -       -      +
    522A  SER*     1.3    58.1    +      -       -      +
    523A  MET      3.2     0.2    -      -       -      -
    524A  ALA*     3.1     7.3    +      -       -      +
    525A  LEU*     3.0    34.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 522 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    518A  TYR*     2.8    24.0    +      -       -      +
    519A  SER      3.9     4.5    -      -       -      -
    521A  SER*     1.3    76.8    -      -       -      +
    523A  MET*     1.3    56.5    +      -       -      +
    525A  LEU*     3.4     2.4    +      -       -      +
    526A  ALA      3.0    20.8    +      -       -      -
    636A  MET      4.3     6.3    -      -       -      -
    637A  ILE*     3.8    12.2    -      -       -      +
    640A  PHE*     3.3    30.1    -      -       -      +
    641A  LEU*     3.4    35.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 523 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    519A  SER      3.2    12.9    +      -       -      +
    520A  ALA*     4.0     2.2    -      -       -      +
    521A  SER      3.2     0.4    -      -       -      -
    522A  SER*     1.3    74.6    -      -       -      +
    524A  ALA*     1.3    63.5    +      -       -      +
    526A  ALA*     4.3     2.7    -      -       +      +
    527A  ILE*     3.3    36.4    +      -       +      +
    541A  MET*     3.6    26.5    -      -       +      -
    544A  CYS*     4.1    21.8    -      -       +      -
    545A  PHE*     3.9    15.7    -      -       +      -
    548A  MET*     3.6    33.7    -      -       +      -
    573A  ILE*     4.5     2.5    -      -       +      -
    640A  PHE*     3.6    40.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 524 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    441A  SER      3.3    26.0    -      -       -      +
    444A  ALA*     3.9    10.8    -      -       +      -
    445A  VAL*     3.8    21.3    -      -       +      +
    520A  ALA      3.2     9.0    +      -       -      +
    521A  SER      3.1    10.1    +      -       -      +
    523A  MET*     1.3    77.6    -      -       -      +
    525A  LEU*     1.3    61.2    +      -       -      +
    527A  ILE*     4.3     1.0    -      -       -      +
    528A  ALA*     3.3    26.7    +      -       -      +
    541A  MET*     3.4    13.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 525 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    444A  ALA*     3.3    23.3    -      -       +      +
    445A  VAL      5.5     0.9    -      -       -      +
    447A  LEU*     3.8    20.4    -      -       +      -
    448A  PHE*     3.8    27.4    -      -       +      +
    474A  LEU*     3.7    30.3    -      -       +      -
    477A  ASP*     5.0     5.4    -      -       -      +
    521A  SER*     3.0    17.8    +      -       -      +
    522A  SER*     3.4     6.3    +      -       -      +
    524A  ALA*     1.3    78.5    -      -       -      +
    526A  ALA*     1.3    58.9    +      -       -      +
    527A  ILE      3.2     0.4    -      -       -      -
    528A  ALA*     4.5     1.6    -      -       +      +
    529A  ALA*     3.0    35.5    +      -       -      +
    641A  LEU*     3.8    11.0    -      -       +      -
    644A  ALA*     3.5    14.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 526 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    522A  SER      3.0    11.7    +      -       -      +
    523A  MET*     3.5     7.6    +      -       +      +
    524A  ALA      3.4     0.2    -      -       -      -
    525A  LEU*     1.3    76.9    -      -       -      +
    527A  ILE*     1.3    60.3    +      -       +      +
    640A  PHE*     3.3    33.0    -      -       +      +
    643A  ILE*     4.0    18.9    -      -       +      +
    644A  ALA*     3.8    11.4    -      -       -      +
    647A  LYS*     2.9    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 527 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    523A  MET*     3.3    34.3    +      -       +      +
    524A  ALA      4.4     2.7    -      -       -      +
    525A  LEU      3.2     0.2    -      -       -      -
    526A  ALA*     1.3    80.9    -      -       +      +
    528A  ALA*     1.3    56.8    +      -       -      +
    531A  GLN*     3.2    15.0    -      -       -      +
    536A  VAL*     6.3     0.7    -      -       +      -
    537A  ALA*     3.9    27.8    -      -       +      +
    540A  LEU*     4.2    35.9    -      -       +      +
    541A  MET*     3.7    20.0    -      -       -      -
    544A  CYS*     5.3     4.3    -      -       -      -
    647A  LYS*     2.9    17.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 528 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    445A  VAL*     3.4    38.6    -      -       +      +
    448A  PHE*     4.5     4.3    -      -       +      +
    449A  VAL*     3.4    22.3    -      -       +      +
    524A  ALA      3.3    19.4    +      -       -      +
    525A  LEU*     3.4     2.2    +      -       +      +
    527A  ILE*     1.3    78.5    -      -       -      +
    529A  ALA*     1.3    63.3    +      -       -      +
    530A  GLY      3.4     1.7    +      -       -      -
    531A  GLN*     3.7    13.5    +      -       -      +
    537A  ALA*     3.7     7.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 529 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    448A  PHE*     4.1    14.4    -      -       +      -
    525A  LEU      3.0    18.6    +      -       -      +
    527A  ILE      3.6     1.2    -      -       -      -
    528A  ALA*     1.3    78.5    -      -       -      +
    530A  GLY*     1.3    62.9    +      -       -      +
    531A  GLN*     3.6     1.6    +      -       -      +
    644A  ALA*     3.4    26.5    -      -       -      +
    647A  LYS*     3.3    37.8    +      -       +      +
    648A  LEU*     4.0     9.9    -      -       +      -
----------------------------------------------------------
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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