Contacts of the helix formed by residues 333 - 359 (chain A) in PDB entry 1HK8


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 ASN 333 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    326A  SER*     3.0    22.3    +      -       -      +
    328A  ILE*     3.8    23.1    -      -       +      +
    331A  GLN      3.5     0.6    +      -       -      +
    332A  PHE*     1.3    75.1    +      -       -      +
    334A  GLU*     1.3    65.6    +      -       -      +
    335A  GLN*     3.3    11.2    +      -       -      +
    336A  LYS*     3.0    30.7    +      -       +      +
    337A  PHE*     3.1    20.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 334 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    332A  PHE*     3.9    25.1    +      -       +      -
    333A  ASN*     1.3    72.6    -      -       -      +
    335A  GLN*     1.3    63.8    +      -       -      +
    337A  PHE*     3.2     7.4    +      -       +      +
    338A  VAL*     3.1    28.3    +      -       +      +
    413A  ARG*     3.7    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 335 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    333A  ASN*     3.2    12.3    +      -       -      +
    334A  GLU*     1.3    77.4    -      -       -      +
    336A  LYS*     1.3    64.4    +      -       -      +
    338A  VAL*     3.2    18.3    +      -       -      +
    339A  GLU*     3.1    44.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 336 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    325A  ASP      4.2     6.5    +      -       -      +
    326A  SER*     4.0    21.8    -      -       -      +
    328A  ILE*     4.2    22.5    -      -       +      +
    333A  ASN*     3.0    30.0    +      -       +      +
    335A  GLN*     1.3    75.2    -      -       -      +
    337A  PHE*     1.3    60.6    +      -       -      +
    339A  GLU*     3.2    20.8    +      -       +      +
    340A  LEU*     3.1    46.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 337 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    322A  ILE*     3.7    31.4    -      -       +      +
    323A  ALA*     3.8    11.9    -      -       +      -
    326A  SER*     3.6    10.7    -      -       -      +
    332A  PHE*     3.6    33.7    -      +       +      -
    333A  ASN      3.1     5.7    +      -       -      +
    334A  GLU*     3.4    13.0    -      -       +      +
    335A  GLN      3.2     0.2    -      -       -      -
    336A  LYS*     1.3    76.0    -      -       -      +
    338A  VAL*     1.3    64.3    +      -       +      +
    340A  LEU*     3.5     0.8    +      -       -      +
    341A  PHE*     3.0    37.5    +      +       +      +
    407A  LEU*     3.8    26.0    -      -       +      -
    411A  VAL*     4.6     1.6    -      -       +      -
    415A  ILE*     4.2    12.8    -      -       +      -
    419A  ILE*     3.6    32.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 338 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    334A  GLU*     3.1    24.7    +      -       +      +
    335A  GLN*     3.2    24.0    +      -       -      +
    337A  PHE*     1.3    81.7    -      -       +      +
    339A  GLU*     1.3    64.8    +      -       +      +
    341A  PHE*     3.9     5.3    -      -       -      +
    342A  ASN*     3.2    39.4    +      -       -      +
    422A  LYS*     5.2    12.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 339 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    335A  GLN*     3.1    43.2    +      -       -      +
    336A  LYS*     3.2    23.6    +      -       +      +
    338A  VAL*     1.3    81.4    -      -       +      +
    340A  LEU*     1.3    59.6    +      -       +      +
    342A  ASN*     3.7     5.1    +      -       -      +
    343A  GLU*     3.2    31.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 340 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    322A  ILE*     3.8    22.9    -      -       +      +
    325A  ASP*     3.6    41.1    -      -       +      +
    326A  SER*     4.2     1.8    -      -       -      +
    336A  LYS*     3.1    38.0    +      -       +      +
    339A  GLU*     1.3    75.9    -      -       +      +
    341A  PHE*     1.3    56.5    +      -       -      +
    343A  GLU*     3.3    24.5    +      -       -      +
    344A  ARG*     2.7    58.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 341 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    317A  LEU*     4.9     2.7    -      -       +      -
    322A  ILE*     4.0    25.9    -      -       +      +
    337A  PHE*     3.0    25.4    +      +       +      +
    338A  VAL*     3.9     5.4    -      -       -      +
    340A  LEU*     1.3    76.5    -      -       -      +
    342A  ASN*     1.3    69.9    +      -       -      +
    344A  ARG*     3.2     2.3    +      -       -      +
    345A  MET*     2.9    48.7    +      -       +      +
    419A  ILE*     3.6    40.4    -      -       +      -
    422A  LYS*     4.5    16.2    -      -       +      -
    423A  MET*     3.7    35.9    -      -       +      -
    426A  HIS*     3.9    21.5    -      +       -      -
----------------------------------------------------------
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Residues in contact with ASN 342 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338A  VAL*     3.2    30.0    +      -       -      +
    339A  GLU*     4.0     5.4    -      -       -      +
    341A  PHE*     1.3    94.9    -      -       -      +
    343A  GLU*     1.3    63.9    +      -       -      +
    345A  MET*     3.5     4.9    +      -       -      +
    346A  ASP*     3.2    30.3    +      -       -      +
    426A  HIS*     4.2    15.7    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 343 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    339A  GLU*     3.2    18.8    +      -       -      +
    340A  LEU*     3.6    25.9    -      -       -      +
    341A  PHE      3.3     0.2    -      -       -      -
    342A  ASN*     1.3    80.3    -      -       -      +
    344A  ARG*     1.3    66.2    +      -       +      +
    346A  ASP*     3.6     7.6    +      -       -      +
    347A  LEU*     3.1    25.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 344 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62A  ILE*     3.4    45.1    +      -       +      +
    317A  LEU*     4.1    16.2    -      -       +      -
    318A  ASN      5.1     0.4    +      -       -      -
    321A  ARG*     3.5     3.6    +      -       -      +
    322A  ILE*     3.4    46.2    -      -       +      +
    325A  ASP*     2.8    34.7    +      -       -      +
    340A  LEU*     2.7    41.3    +      -       -      +
    341A  PHE      3.8     3.1    -      -       -      +
    343A  GLU*     1.3    80.2    +      -       +      +
    345A  MET*     1.3    61.8    +      -       -      +
    347A  LEU*     3.3    12.9    +      -       +      +
    348A  CYS*     3.0    33.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 345 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    317A  LEU*     4.1     8.7    -      -       +      -
    341A  PHE*     2.9    43.0    +      -       +      +
    342A  ASN      3.8     5.2    -      -       -      +
    344A  ARG*     1.3    73.4    -      -       -      +
    346A  ASP*     1.3    64.8    +      -       -      +
    348A  CYS*     3.3     3.9    +      -       -      +
    349A  PHE      3.1     9.5    +      -       -      -
    399A  LEU*     3.7    25.6    -      -       +      -
    423A  MET*     4.0    40.6    -      -       -      +
    426A  HIS*     3.5    43.5    -      -       +      +
    427A  LEU*     4.6     0.2    -      -       +      -
    430A  TRP*     3.0    28.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 346 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    342A  ASN*     3.2    14.9    +      -       -      +
    343A  GLU*     3.6    10.5    -      -       -      +
    345A  MET*     1.3    78.3    -      -       -      +
    347A  LEU*     1.3    62.4    +      -       -      +
    349A  PHE*     3.2    13.5    +      -       -      +
    350A  GLU*     3.1    24.8    +      -       -      +
    426A  HIS*     4.7     9.4    +      -       -      -
    430A  TRP*     4.8     4.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 347 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53A  PHE*     3.5    44.2    -      -       +      +
     54A  ILE*     4.2     9.8    -      -       +      +
     57A  ALA*     3.8    24.2    -      -       +      -
     62A  ILE*     4.1    11.2    -      -       +      -
     63A  ILE*     3.9    23.3    -      -       +      -
    343A  GLU*     3.1    14.0    +      -       +      +
    344A  ARG*     3.4    15.3    -      -       +      +
    345A  MET      3.2     0.4    -      -       -      -
    346A  ASP*     1.3    79.1    -      -       -      +
    348A  CYS*     1.3    62.6    +      -       -      +
    350A  GLU*     3.0     9.8    +      -       -      +
    351A  ALA*     3.0    20.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 348 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63A  ILE*     3.7    25.1    -      -       -      -
    315A  VAL*     4.1    12.3    -      -       +      +
    317A  LEU*     3.8    17.3    -      -       -      -
    344A  ARG      3.0    16.8    +      -       -      -
    345A  MET*     3.3     9.6    +      -       -      +
    347A  LEU*     1.3    76.4    -      -       -      +
    349A  PHE*     1.3    56.5    +      -       -      +
    351A  ALA*     3.2     7.3    +      -       -      +
    352A  LEU*     2.9    35.4    +      -       -      +
    399A  LEU*     3.7    32.8    -      -       +      -
    430A  TRP*     4.3     3.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 349 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    345A  MET      3.1     5.3    +      -       -      -
    346A  ASP*     3.4    12.8    -      -       -      +
    348A  CYS*     1.3    74.9    -      -       -      +
    350A  GLU*     1.3    76.9    +      -       -      +
    352A  LEU*     4.0     2.6    -      -       -      +
    353A  MET*     2.9    63.2    +      -       +      +
    430A  TRP*     3.5    64.9    -      +       +      +
    433A  ARG*     4.1    34.5    -      -       -      -
    434A  THR*     3.9    26.5    -      -       +      -
    438A  PHE*     4.3     4.0    -      +       -      -
----------------------------------------------------------
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Residues in contact with GLU 350 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  PRO*     6.4     0.2    -      -       +      -
     53A  PHE*     3.6    29.4    -      -       +      -
     54A  ILE*     3.6    11.5    -      -       +      +
    346A  ASP*     3.1    12.8    +      -       -      +
    347A  LEU*     3.0    11.5    +      -       -      +
    349A  PHE*     1.3    96.9    -      -       -      +
    351A  ALA*     1.3    58.3    +      -       -      +
    353A  MET*     4.1     5.5    -      -       -      +
    354A  CYS*     2.9    29.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 351 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  ILE*     3.9    30.3    -      -       +      +
     63A  ILE*     4.4    13.0    -      -       +      -
     65A  VAL*     4.4     5.2    -      -       +      +
    315A  VAL*     4.0    17.9    -      -       +      -
    347A  LEU      3.0    11.8    +      -       -      +
    348A  CYS      3.2     7.8    +      -       -      +
    350A  GLU*     1.3    76.7    -      -       -      +
    352A  LEU*     1.3    65.4    +      -       -      +
    354A  CYS*     3.3    16.0    +      -       -      +
    355A  ARG*     3.4    12.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 352 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    313A  GLY      4.1     8.7    -      -       -      +
    314A  VAL      4.1     1.1    -      -       -      -
    315A  VAL*     3.5    31.0    -      -       +      +
    348A  CYS      2.9    19.8    +      -       -      +
    349A  PHE      4.0     2.5    -      -       -      +
    351A  ALA*     1.3    78.0    -      -       -      +
    353A  MET*     1.3    60.9    +      -       -      +
    355A  ARG*     3.1    25.6    -      -       +      +
    356A  ILE*     3.3    15.9    +      -       -      +
    397A  VAL*     3.9    15.3    -      -       +      -
    398A  SER      3.6    28.7    -      -       -      +
    399A  LEU*     4.4     7.2    -      -       +      -
    430A  TRP*     4.4    10.5    -      -       +      -
    438A  PHE*     3.9    34.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 353 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    349A  PHE*     2.9    54.1    +      -       +      +
    350A  GLU*     4.1     7.9    -      -       -      +
    352A  LEU*     1.3    74.6    -      -       -      +
    354A  CYS*     1.3    66.5    +      -       -      +
    356A  ILE*     3.3    19.6    +      -       +      +
    357A  SER*     2.9    27.9    +      -       -      +
    360A  LYS*     6.2     2.0    -      -       -      +
    434A  THR*     4.1    22.7    -      -       +      -
    436A  PHE*     4.8    10.8    -      -       +      -
    438A  PHE*     3.9    22.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 354 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49A  MET      4.5     4.3    -      -       -      -
     50A  VAL*     4.2    23.8    -      -       +      -
     51A  PRO*     3.7    27.4    -      -       +      -
     54A  ILE*     4.4     5.4    -      -       +      -
     72A  PRO*     5.3     4.0    -      -       -      +
    350A  GLU      2.9    20.2    +      -       -      +
    351A  ALA*     3.3    11.4    -      -       -      +
    353A  MET*     1.3    78.8    -      -       -      +
    355A  ARG*     1.3    60.8    +      -       -      +
    357A  SER*     3.4     8.3    -      -       -      -
    358A  SER*     3.4    15.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 355 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65A  VAL*     3.7    17.6    -      -       -      +
     66A  HIS*     3.0    29.7    +      -       -      +
     67A  ASP*     3.9     1.6    +      -       -      +
     68A  ILE*     4.4     0.6    -      -       -      +
     71A  SER*     3.0    53.1    +      -       -      +
     72A  PRO*     4.7     9.4    -      -       +      +
    124A  TYR*     4.0    14.8    +      -       -      -
    312A  LEU      5.1    10.3    -      -       -      +
    313A  GLY*     4.4     1.9    -      -       -      -
    314A  VAL      3.6    21.8    +      -       -      +
    315A  VAL*     4.5    10.1    -      -       -      -
    351A  ALA      3.5    10.5    -      -       -      +
    352A  LEU*     3.1    27.6    -      -       +      +
    354A  CYS*     1.3    77.5    -      -       -      +
    356A  ILE*     1.3    66.6    +      -       +      +
    358A  SER*     2.7    29.2    +      -       -      -
    359A  LEU*     3.6     5.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 356 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    312A  LEU*     4.2    22.0    -      -       +      +
    352A  LEU      3.3    16.7    +      -       -      +
    353A  MET*     3.8    29.4    -      -       +      +
    355A  ARG*     1.3    78.7    -      -       +      +
    357A  SER*     1.3    61.0    -      -       -      +
    359A  LEU*     3.1    26.0    +      -       +      +
    360A  LYS*     6.2     0.7    -      -       -      -
    387A  ILE*     3.5    13.9    -      -       +      +
    397A  VAL*     4.0    32.8    -      -       +      -
    436A  PHE*     3.7    38.4    -      -       +      -
    438A  PHE*     4.6     2.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 357 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    353A  MET*     2.9    15.8    +      -       -      +
    354A  CYS*     3.4    13.5    -      -       -      -
    356A  ILE*     1.3    76.4    -      -       -      +
    358A  SER*     1.3    65.6    +      -       -      +
    360A  LYS*     3.1    49.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 358 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49A  MET*     4.4    11.4    -      -       -      -
     71A  SER*     4.8     2.1    +      -       -      -
     72A  PRO*     3.7    37.1    +      -       -      +
     75A  PRO*     4.6     8.0    -      -       -      +
    354A  CYS      3.4     5.6    +      -       -      -
    355A  ARG      2.7    19.4    +      -       -      -
    357A  SER*     1.3    78.7    -      -       -      +
    359A  LEU*     1.3    68.1    +      -       -      +
    360A  LYS      3.2     8.5    +      -       -      +
    362A  VAL*     3.8    10.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 359 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75A  PRO*     3.4    42.0    -      -       +      +
     76A  PHE      4.4     7.2    -      -       -      +
     77A  THR*     4.9     4.5    -      -       +      -
    312A  LEU*     4.2    19.5    -      -       +      +
    355A  ARG      4.0     6.3    -      -       -      +
    356A  ILE*     3.3    20.9    -      -       +      +
    357A  SER      3.1     1.2    -      -       -      -
    358A  SER*     1.3    81.6    +      -       -      +
    360A  LYS*     1.3    63.1    +      -       -      +
    361A  GLY      3.4     0.5    +      -       -      -
    362A  VAL*     3.3    22.7    +      -       -      +
    386A  ILE*     4.5    12.4    -      -       +      +
    387A  ILE*     3.9    22.4    -      -       +      +
    390A  PHE*     3.8    28.3    -      -       +      -
----------------------------------------------------------
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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