Contacts of the helix formed by residues 498 - 527 (chain A) in PDB entry 4IM0


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 ILE 498 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    475A  ILE*     3.5    36.3    -      -       +      +
    478A  THR*     5.5     2.7    -      -       -      +
    479A  VAL*     4.5    18.2    -      -       +      -
    497A  GLU*     1.3    78.9    -      -       +      +
    499A  SER*     1.3    54.7    +      -       -      +
    501A  ILE*     2.7    35.9    +      -       +      +
    502A  HIS*     2.8    23.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 499 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    497A  GLU      4.1     4.9    -      -       -      +
    498A  ILE*     1.3    80.8    -      -       -      +
    500A  ASP*     1.3    55.8    +      -       -      +
    502A  HIS*     4.1     5.8    -      -       -      +
    503A  THR*     2.7    45.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 500 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    497A  GLU*     2.9    42.0    +      -       -      +
    499A  SER*     1.3    80.8    -      -       -      +
    501A  ILE*     1.3    60.3    +      -       +      +
    503A  THR*     3.2    15.0    +      -       -      -
    504A  LYS*     3.2    23.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 501 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    475A  ILE*     3.6    28.0    -      -       +      -
    497A  GLU*     3.8    17.3    -      -       +      +
    498A  ILE*     2.7    28.4    +      -       +      +
    500A  ASP*     1.3    78.5    -      -       +      +
    502A  HIS*     1.3    62.2    +      -       -      +
    504A  LYS*     3.6     4.5    +      -       -      +
    505A  LEU*     3.1    27.5    +      -       +      +
    647A  TYR*     4.6    26.3    -      -       +      -
    650A  TYR*     5.9     3.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 502 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    472A  ILE*     3.3    38.3    +      -       +      +
    475A  ILE*     3.9    34.3    -      -       +      +
    476A  GLU*     4.7    16.4    +      -       +      +
    498A  ILE*     2.8    18.8    +      -       +      +
    499A  SER*     4.1     6.7    -      -       -      +
    501A  ILE*     1.3    75.8    -      -       -      +
    503A  THR*     1.3    57.1    +      -       +      +
    505A  LEU*     4.3     4.5    -      -       +      -
    506A  LEU*     2.7    40.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 503 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    499A  SER*     2.7    30.3    +      -       -      +
    500A  ASP*     3.2    15.9    +      -       -      -
    502A  HIS*     1.3    79.1    -      -       +      +
    504A  LYS*     1.3    57.9    +      -       -      +
    506A  LEU*     3.9     4.1    +      -       -      +
    507A  ARG*     3.0    33.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 504 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    500A  ASP      3.2    20.1    +      -       -      +
    501A  ILE*     4.1     4.0    -      -       -      +
    502A  HIS      3.3     0.2    -      -       -      -
    503A  THR*     1.3    79.2    +      -       -      +
    505A  LEU*     1.3    61.5    +      -       -      +
    507A  ARG*     3.4    19.6    -      -       -      +
    508A  LEU*     3.4    15.9    -      -       -      +
    647A  TYR*     4.7    17.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 505 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    468A  LEU*     3.4    33.0    -      -       +      -
    471A  CYS*     4.9     5.6    -      -       +      +
    472A  ILE*     3.4    47.6    -      -       +      +
    475A  ILE*     5.1     4.7    -      -       +      -
    501A  ILE*     3.1    25.8    +      -       +      +
    502A  HIS*     3.2     5.8    +      -       +      +
    504A  LYS*     1.3    74.7    -      -       -      +
    506A  LEU*     1.3    54.9    +      -       -      +
    507A  ARG      3.0     4.7    -      -       -      -
    508A  LEU*     2.7    38.6    +      -       +      +
    509A  SER*     3.2     5.5    +      -       -      +
    644A  VAL*     6.0     1.1    -      -       +      -
    647A  TYR*     4.3    24.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 506 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    472A  ILE*     4.6    14.5    -      -       +      +
    502A  HIS*     2.7    23.6    +      -       +      +
    503A  THR*     4.4     4.5    -      -       -      +
    505A  LEU*     1.3    72.6    -      -       -      +
    507A  ARG*     1.3    59.1    +      -       -      +
    509A  SER*     4.0     6.2    -      -       -      +
    510A  SER*     3.1    26.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 507 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    503A  THR*     3.0    24.6    +      -       -      +
    504A  LYS*     3.4    12.8    +      -       -      +
    505A  LEU      3.0     0.6    -      -       -      -
    506A  LEU*     1.3    78.9    -      -       -      +
    508A  LEU*     1.3    56.4    +      -       +      +
    510A  SER*     2.5    27.9    +      -       -      -
    511A  SER*     2.7    22.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 508 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    468A  LEU*     4.1    16.2    -      -       +      -
    504A  LYS      3.4    18.2    -      -       -      +
    505A  LEU*     2.7    25.4    +      -       +      +
    507A  ARG*     1.3    73.9    -      -       +      +
    509A  SER*     1.3    52.5    +      -       -      +
    511A  SER*     3.0    10.0    +      -       -      +
    512A  GLN*     2.7    37.1    +      -       -      +
    640A  ILE*     4.3    19.5    -      -       +      +
    643A  GLU*     4.0    29.2    -      -       +      +
    644A  VAL*     4.1    24.2    -      -       +      -
    647A  TYR*     5.1     9.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 509 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    468A  LEU*     4.0    18.2    -      -       -      +
    469A  ASP*     4.4    14.2    +      -       -      -
    472A  ILE*     4.6    14.5    -      -       -      +
    505A  LEU      3.2     5.8    +      -       -      -
    506A  LEU*     4.0    10.5    -      -       -      -
    508A  LEU*     1.3    78.2    -      -       -      +
    510A  SER*     1.3    57.6    +      -       -      +
    512A  GLN*     3.0    12.8    +      -       -      +
    513A  GLY*     2.9    23.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 510 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    506A  LEU      3.1    15.0    +      -       -      -
    507A  ARG*     2.5    36.8    +      -       -      +
    509A  SER*     1.3    75.5    -      -       -      +
    511A  SER*     1.3    61.1    +      -       -      +
    513A  GLY*     3.2    10.9    +      -       -      +
    514A  THR*     3.2    18.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 511 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    507A  ARG      2.7    21.4    +      -       -      -
    508A  LEU*     3.0    15.9    +      -       -      +
    510A  SER*     1.3    74.4    +      -       -      +
    512A  GLN*     1.3    57.7    +      -       -      +
    514A  THR*     2.5    27.5    +      -       -      -
    515A  ILE*     3.0    17.1    -      -       -      +
    640A  ILE*     4.1    14.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 512 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    461A  LYS*     4.0    15.5    +      -       +      +
    464A  VAL*     3.4    28.3    -      -       -      +
    465A  VAL*     3.1    38.2    -      -       -      +
    468A  LEU*     3.6    23.7    -      -       +      +
    469A  ASP*     5.6     0.8    +      -       -      -
    508A  LEU      2.7    16.1    +      -       -      +
    509A  SER*     3.0    13.2    +      -       -      +
    511A  SER*     1.3    71.5    -      -       -      +
    513A  GLY*     1.3    61.5    +      -       -      +
    514A  THR      3.2     0.4    -      -       -      -
    515A  ILE*     3.5     9.0    +      -       +      +
    516A  GLU*     3.1    25.1    +      -       -      +
    640A  ILE*     3.9    18.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 513 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    509A  SER      2.9    12.4    +      -       -      -
    510A  SER*     3.2     6.1    +      -       -      -
    512A  GLN*     1.3    76.1    -      -       -      +
    514A  THR*     1.3    63.3    +      -       -      +
    516A  GLU*     3.4     6.5    +      -       -      +
    517A  THR*     3.2    25.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 514 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    510A  SER      3.2    16.6    -      -       -      +
    511A  SER*     2.5    26.2    +      -       -      -
    513A  GLY*     1.3    76.2    -      -       -      +
    515A  ILE*     1.3    65.3    +      -       -      +
    517A  THR*     3.2    20.1    -      -       -      +
    518A  SER*     3.4    15.2    +      -       -      -
    633A  LEU*     4.9     0.6    -      -       -      +
    636A  GLN*     4.9     2.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 515 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    461A  LYS*     3.3    28.3    -      -       +      -
    511A  SER*     3.0    27.2    +      -       -      +
    512A  GLN*     3.5     8.3    +      -       +      +
    513A  GLY      3.2     0.4    -      -       -      -
    514A  THR*     1.3    82.9    +      -       -      +
    516A  GLU*     1.3    59.8    +      -       -      +
    518A  SER*     3.0     3.5    +      -       -      -
    519A  LEU*     2.8    41.9    +      -       +      +
    633A  LEU*     3.6    31.4    -      -       +      +
    636A  GLN*     3.2    31.4    -      -       +      +
    637A  CYS*     4.4     9.9    -      -       -      -
    640A  ILE*     4.2    13.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 516 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    461A  LYS*     2.4    40.1    +      -       -      +
    512A  GLN      3.1    17.0    +      -       -      +
    513A  GLY*     3.4     8.9    +      -       -      +
    515A  ILE*     1.3    78.4    -      -       -      +
    517A  THR*     1.3    57.6    +      -       -      +
    519A  LEU*     3.3     7.9    +      -       -      +
    520A  GLN*     3.0    33.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 517 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    513A  GLY      3.2    13.9    +      -       -      +
    514A  THR*     3.2    23.3    -      -       -      +
    516A  GLU*     1.3    79.5    -      -       -      +
    518A  SER*     1.3    62.2    +      -       -      +
    520A  GLN*     3.7     8.0    +      -       -      +
    521A  ASP*     3.3    20.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 518 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    514A  THR      3.4    16.1    +      -       -      -
    515A  ILE      3.0     5.6    +      -       -      -
    517A  THR*     1.3    80.6    -      -       -      +
    519A  LEU*     1.3    62.3    +      -       -      +
    521A  ASP*     3.2     8.4    +      -       -      +
    522A  ILE*     3.1    26.0    +      -       -      +
    633A  LEU*     3.6    25.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 519 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    454A  TYR*     3.3    34.9    -      -       +      +
    457A  THR*     4.1    18.8    -      -       -      +
    458A  VAL*     3.7    20.4    -      -       +      -
    461A  LYS*     3.7    21.8    -      -       +      -
    515A  ILE*     2.8    38.0    +      -       +      +
    516A  GLU*     3.6     8.5    -      -       -      +
    518A  SER*     1.3    73.4    -      -       -      +
    520A  GLN*     1.3    60.0    +      -       -      +
    521A  ASP      3.0     2.0    -      -       -      -
    522A  ILE*     3.0     3.2    +      -       +      +
    523A  ASP*     2.8    27.9    +      -       -      +
    630A  LEU*     4.2     8.7    -      -       +      -
    633A  LEU*     3.7    21.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 520 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    454A  TYR*     4.7     2.2    +      -       -      -
    516A  GLU*     3.0    20.9    +      -       +      +
    517A  THR*     3.8     9.9    -      -       -      +
    519A  LEU*     1.3    77.1    -      -       -      +
    521A  ASP*     1.3    57.2    +      -       -      +
    523A  ASP*     4.0     6.8    -      -       -      +
    524A  SER*     3.2    25.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 521 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    517A  THR      3.3    12.2    +      -       -      +
    518A  SER*     3.2    13.3    +      -       -      +
    519A  LEU      3.0     0.4    -      -       -      -
    520A  GLN*     1.3    78.9    -      -       -      +
    522A  ILE*     1.3    61.1    +      -       -      +
    524A  SER*     3.5     7.8    +      -       -      -
    525A  ARG*     3.2    55.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 522 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    454A  TYR*     4.1    11.9    -      -       +      -
    518A  SER      3.1     8.0    +      -       -      +
    519A  LEU*     3.0     7.9    +      -       +      +
    521A  ASP*     1.3    75.4    -      -       -      +
    523A  ASP*     1.3    67.0    +      -       -      +
    525A  ARG*     3.0    27.9    +      -       -      +
    526A  LEU*     3.0    32.8    +      -       +      +
    626A  LEU*     3.9    28.3    -      -       +      +
    629A  GLN*     4.3     5.2    -      -       +      -
    630A  LEU*     3.8    37.0    -      -       +      +
    633A  LEU*     3.7    27.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 523 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    454A  TYR*     3.1    44.5    -      -       +      +
    519A  LEU      2.8    10.2    +      -       -      +
    520A  GLN*     4.0     6.5    -      -       -      +
    522A  ILE*     1.3    75.1    -      -       -      +
    524A  SER*     1.3    58.8    +      -       -      +
    526A  LEU*     3.0    19.0    +      -       -      +
    527A  SER*     2.8    31.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 524 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    520A  GLN      3.2    17.9    +      -       -      -
    521A  ASP*     3.5    12.4    +      -       -      -
    522A  ILE      3.2     0.2    -      -       -      -
    523A  ASP*     1.3    81.2    +      -       -      +
    525A  ARG*     1.3    60.2    +      -       -      +
    527A  SER*     3.5    15.4    +      -       -      -
    530A  GLY*     3.2    17.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 525 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    521A  ASP*     3.2    38.5    +      -       -      +
    522A  ILE*     3.0    25.5    +      -       -      +
    524A  SER*     1.3    80.6    -      -       -      +
    526A  LEU*     1.3    59.6    +      -       -      +
    527A  SER      3.2     1.9    -      -       -      +
    530A  GLY*     3.2    20.0    -      -       -      -
    531A  SER*     3.1    26.2    -      -       -      +
    532A  LEU*     3.2    20.1    +      -       -      +
    622A  LYS*     5.2     2.0    +      -       -      +
    625A  HIS*     4.0    17.0    +      -       -      -
    626A  LEU*     3.7    32.1    -      -       +      +
    629A  GLN*     2.3    34.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 526 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    447A  ILE*     5.1     6.5    -      -       +      +
    450A  ILE*     4.2    16.4    -      -       +      -
    451A  LYS*     3.2    52.2    +      -       +      -
    454A  TYR*     4.1    22.7    -      -       +      -
    522A  ILE*     3.0    31.9    +      -       +      +
    523A  ASP*     3.0    11.2    +      -       -      +
    525A  ARG*     1.3    74.8    -      -       -      +
    527A  SER*     1.3    63.9    +      -       -      +
    532A  LEU*     3.9    29.5    -      -       +      +
    626A  LEU*     3.9    20.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 527 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    451A  LYS*     5.5     0.7    -      -       -      +
    523A  ASP*     2.8    27.4    +      -       -      -
    524A  SER*     3.5    14.9    -      -       -      -
    525A  ARG      3.2     2.3    -      -       -      +
    526A  LEU*     1.3    83.2    -      -       -      +
    528A  PRO*     1.4    69.4    -      -       -      +
    529A  GLY      3.2     3.4    -      -       -      -
    530A  GLY*     2.7    23.1    +      -       -      +
    533A  ALA*     4.8     5.2    -      -       -      +
----------------------------------------------------------
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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