Contacts of the helix formed by residues 340 - 377 (chain A) in PDB entry 1USE


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 ASP 340 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338A  SER      3.4     3.8    +      -       -      +
    339A  SER*     1.3    75.0    -      -       -      +
    341A  TYR*     1.3    67.0    +      -       -      +
    342A  SER*     3.1    19.1    +      -       -      -
    343A  ASP*     2.9    39.9    +      -       -      +
    344A  LEU*     3.2    16.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 341 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    340A  ASP*     1.3    77.3    -      -       -      +
    342A  SER*     1.3    64.6    +      -       -      +
    344A  LEU*     3.2    24.8    +      -       +      +
    345A  GLN*     3.0    54.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 342 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    340A  ASP*     3.1    18.4    +      -       -      -
    341A  TYR*     1.3    79.7    -      -       -      +
    343A  ASP*     1.3    59.0    +      -       -      +
    345A  GLN*     3.2     9.3    +      -       -      +
    346A  ARG*     2.9    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 343 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338A  SER      4.2     2.8    -      -       -      +
    339A  SER*     3.4    17.2    -      -       -      -
    340A  ASP*     2.9    38.7    +      -       -      +
    342A  SER*     1.3    76.7    -      -       -      +
    344A  LEU*     1.3    64.6    +      -       -      +
    346A  ARG*     3.2    12.1    +      -       -      +
    347A  VAL*     3.0    32.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 344 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    339A  SER*     5.0    13.2    -      -       -      +
    340A  ASP      3.2    12.9    +      -       -      +
    341A  TYR*     3.4    29.8    -      -       +      +
    343A  ASP*     1.3    78.1    -      -       -      +
    345A  GLN*     1.3    59.4    +      -       +      +
    347A  VAL*     3.9     3.7    -      -       +      +
    348A  LYS*     2.9    30.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 345 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341A  TYR*     3.0    53.3    +      -       +      +
    342A  SER*     3.2    11.4    +      -       -      +
    344A  LEU*     1.3    75.7    -      -       -      +
    346A  ARG*     1.3    64.5    +      -       -      +
    348A  LYS*     2.9    39.9    +      -       -      +
    349A  GLN*     3.0    31.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 346 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    342A  SER      2.9    14.4    +      -       -      +
    343A  ASP*     3.6    14.6    +      -       -      +
    345A  GLN*     1.3    76.4    -      -       -      +
    347A  VAL*     1.3    61.3    +      -       +      +
    349A  GLN*     3.2     7.6    +      -       -      +
    350A  GLU*     3.0    45.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 347 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    343A  ASP*     3.0    19.1    +      -       +      +
    344A  LEU*     4.1     4.3    -      -       +      +
    346A  ARG*     1.3    78.1    -      -       +      +
    348A  LYS*     1.3    65.2    +      -       -      +
    350A  GLU*     3.2    19.0    +      -       +      +
    351A  LEU*     2.9    27.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 348 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    344A  LEU      2.9    18.9    +      -       -      +
    345A  GLN*     2.9    39.4    +      -       -      +
    346A  ARG      3.3     0.2    -      -       -      -
    347A  VAL*     1.3    75.2    -      -       -      +
    349A  GLN*     1.3    82.3    +      -       -      +
    351A  LEU*     3.4     7.3    +      -       -      +
    352A  LEU*     2.9    33.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 349 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    345A  GLN*     3.0    22.1    +      -       +      +
    346A  ARG*     3.6     6.7    -      -       -      +
    347A  VAL      3.2     0.2    -      -       -      -
    348A  LYS*     1.3    96.8    +      -       -      +
    350A  GLU*     1.3    66.2    +      -       +      +
    352A  LEU*     3.3    22.5    +      -       -      +
    353A  GLU*     3.0    40.2    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    346A  ARG*     3.0    38.0    +      -       +      +
    347A  VAL*     3.2    22.8    +      -       +      +
    349A  GLN*     1.3    77.1    -      -       +      +
    351A  LEU*     1.3    62.8    +      -       -      +
    353A  GLU*     3.4     5.8    +      -       -      +
    354A  GLU*     3.1    36.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 351 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    347A  VAL*     2.9    20.3    +      -       +      +
    348A  LYS*     3.6     7.6    -      -       -      +
    350A  GLU*     1.3    75.8    -      -       -      +
    352A  LEU*     1.3    58.2    +      -       -      +
    354A  GLU*     3.2    15.3    +      -       +      +
    355A  VAL*     2.8    48.9    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    348A  LYS*     2.9    24.1    +      -       +      +
    349A  GLN*     3.3    25.5    +      -       -      +
    351A  LEU*     1.3    76.6    -      -       -      +
    353A  GLU*     1.3    58.0    +      -       -      +
    355A  VAL*     4.0    10.0    -      -       +      +
    356A  LYS*     3.1    63.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 353 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    349A  GLN*     3.0    31.7    +      -       +      +
    350A  GLU*     3.7     6.7    -      -       -      +
    352A  LEU*     1.3    76.9    -      -       -      +
    354A  GLU*     1.3    63.3    +      -       +      +
    356A  LYS*     3.3    35.9    +      -       -      +
    357A  LYS*     3.1    22.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 354 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    350A  GLU*     3.1    26.0    +      -       -      +
    351A  LEU*     3.7    17.2    -      -       +      +
    353A  GLU*     1.3    75.2    -      -       +      +
    355A  VAL*     1.3    63.3    +      -       +      +
    357A  LYS*     3.3     8.2    +      -       -      +
    358A  GLU*     3.0    31.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 355 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    351A  LEU*     2.8    38.3    +      -       +      +
    352A  LEU*     4.1    11.7    -      -       +      +
    354A  GLU*     1.3    75.7    -      -       +      +
    356A  LYS*     1.3    58.2    +      -       +      +
    358A  GLU*     3.2     8.5    +      -       +      +
    359A  LEU*     2.9    48.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 356 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    349A  GLN*     6.0     0.2    -      -       -      +
    352A  LEU*     3.1    48.0    +      -       +      +
    353A  GLU*     3.3    34.5    +      -       -      +
    355A  VAL*     1.3    77.7    -      -       -      +
    357A  LYS*     1.3    57.2    +      -       -      +
    359A  LEU*     3.3    12.3    +      -       +      +
    360A  GLN*     3.0    34.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 357 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    353A  GLU      3.1    13.7    +      -       -      +
    354A  GLU*     3.5    11.2    -      -       -      +
    355A  VAL      3.3     0.2    -      -       -      -
    356A  LYS*     1.3    77.4    -      -       -      +
    358A  GLU*     1.3    60.5    +      -       +      +
    360A  GLN*     3.4     7.4    +      -       -      +
    361A  LYS*     3.1    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 358 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    354A  GLU*     3.0    20.9    +      -       +      +
    355A  VAL*     3.2     7.6    +      -       +      +
    357A  LYS*     1.3    77.4    -      -       -      +
    359A  LEU*     1.3    59.0    +      -       +      +
    361A  LYS*     3.4    11.1    +      -       -      +
    362A  VAL*     3.0    29.7    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    355A  VAL*     2.9    38.1    +      -       +      +
    356A  LYS*     3.6    11.9    -      -       +      +
    358A  GLU*     1.3    75.4    -      -       +      +
    360A  GLN*     1.3    63.2    +      -       -      +
    362A  VAL*     3.2    17.0    -      -       +      +
    363A  LYS*     2.9    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 360 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    356A  LYS*     3.0    21.2    +      -       +      +
    357A  LYS*     3.6     7.6    -      -       -      +
    358A  GLU      3.3     0.2    -      -       -      -
    359A  LEU*     1.3    78.3    -      -       -      +
    361A  LYS*     1.3    64.9    +      -       -      +
    363A  LYS*     2.5    43.2    +      -       -      +
    364A  GLU*     3.0    40.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 361 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    357A  LYS      3.1    14.3    +      -       -      +
    358A  GLU*     3.6    17.3    -      -       -      +
    359A  LEU      3.3     0.2    -      -       -      -
    360A  GLN*     1.3    77.2    -      -       -      +
    362A  VAL*     1.3    60.9    +      -       -      +
    364A  GLU*     3.3    13.0    +      -       -      +
    365A  GLU*     3.1    32.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 362 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    358A  GLU      3.0    15.4    +      -       -      +
    359A  LEU*     3.2    26.2    -      -       +      +
    361A  LYS*     1.3    72.5    -      -       -      +
    363A  LYS*     1.3    70.5    +      -       +      +
    365A  GLU*     3.3    17.9    +      -       +      +
    366A  ILE*     2.9    46.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 363 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    359A  LEU      2.9    18.3    +      -       -      +
    360A  GLN*     2.5    43.4    +      -       -      +
    362A  VAL*     1.3    78.8    -      -       -      +
    364A  GLU*     1.3    74.2    +      -       -      +
    366A  ILE*     3.3     8.7    +      -       -      +
    367A  ILE*     3.0    48.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 364 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    360A  GLN*     3.0    26.3    +      -       -      +
    361A  LYS*     3.6    12.8    -      -       -      +
    363A  LYS*     1.3    87.5    +      -       -      +
    365A  GLU*     1.3    58.9    +      -       +      +
    367A  ILE*     3.4     7.8    +      -       -      +
    368A  GLU*     2.9    31.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 365 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    361A  LYS*     3.1    19.5    +      -       +      +
    362A  VAL*     3.7    25.2    -      -       +      +
    363A  LYS      3.3     0.2    -      -       -      -
    364A  GLU*     1.3    73.9    -      -       +      +
    366A  ILE*     1.3    67.3    +      -       +      +
    368A  GLU*     4.0     4.9    +      -       -      +
    369A  ALA*     3.0    24.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 366 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    362A  VAL*     2.9    40.5    +      -       +      +
    363A  LYS*     3.7     6.5    -      -       -      +
    365A  GLU*     1.3    78.9    -      -       +      +
    367A  ILE*     1.3    66.8    +      -       +      +
    369A  ALA*     3.2     6.5    +      -       -      +
    370A  PHE*     3.0    23.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 367 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    363A  LYS*     3.0    42.8    +      -       +      +
    364A  GLU*     3.9     6.3    -      -       -      +
    366A  ILE*     1.3    80.2    -      -       +      +
    368A  GLU*     1.3    62.7    +      -       -      +
    370A  PHE*     3.2     8.8    +      -       +      +
    371A  VAL*     3.0    34.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 368 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    364A  GLU      2.9    18.2    -      -       -      +
    365A  GLU*     4.1     5.6    -      -       -      +
    367A  ILE*     1.3    77.3    +      -       -      +
    369A  ALA*     1.3    57.8    -      -       -      +
    371A  VAL*     3.4     8.4    -      -       -      +
    372A  GLN*     2.9    57.7    +      -       +      +
    375A  ARG*     4.6     7.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 369 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    365A  GLU      3.0    19.0    +      -       -      +
    366A  ILE*     3.6     5.8    -      -       -      +
    368A  GLU*     1.3    76.0    +      -       -      +
    370A  PHE*     1.3    63.1    +      -       -      +
    372A  GLN*     3.4     6.3    +      -       -      +
    373A  GLU*     3.0    29.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 370 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    366A  ILE*     3.0    18.1    +      -       +      +
    367A  ILE*     3.2     9.4    +      -       +      +
    369A  ALA*     1.3    75.2    -      -       -      +
    371A  VAL*     1.3    74.5    +      -       +      +
    373A  GLU*     3.2     9.0    +      -       +      +
    374A  LEU*     2.9    64.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 371 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    367A  ILE*     3.0    32.4    +      -       +      +
    368A  GLU*     3.8    11.0    -      -       -      +
    370A  PHE*     1.3    86.6    -      -       +      +
    372A  GLN*     1.3    63.5    +      -       -      +
    374A  LEU*     3.1    10.2    +      -       +      +
    375A  ARG*     2.9    60.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 372 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    368A  GLU*     2.9    41.6    +      -       +      +
    369A  ALA*     3.8     7.2    -      -       -      +
    371A  VAL*     1.3    77.4    -      -       -      +
    373A  GLU*     1.3    62.8    +      -       -      +
    375A  ARG*     3.2    40.9    +      -       -      +
    376A  LYS*     3.1    36.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 373 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    369A  ALA*     3.0    18.9    +      -       +      +
    370A  PHE*     3.6    12.6    -      -       +      +
    372A  GLN*     1.3    77.9    -      -       -      +
    374A  LEU*     1.3    58.1    +      -       +      +
    376A  LYS*     2.7    33.5    +      -       -      +
    377A  ARG*     2.9    67.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 374 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    370A  PHE*     2.9    59.9    +      -       +      +
    371A  VAL*     3.1    10.5    +      -       +      +
    373A  GLU*     1.3    75.7    -      -       +      +
    375A  ARG*     1.3    61.4    +      -       +      +
    377A  ARG*     2.9    26.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 375 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    368A  GLU*     4.6     5.1    +      -       -      -
    371A  VAL*     2.9    38.9    +      -       +      +
    372A  GLN*     3.2    44.0    +      -       -      +
    374A  LEU*     1.3    77.8    -      -       +      +
    376A  LYS*     1.3    63.1    +      -       +      +
    377A  ARG      4.2     1.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 376 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    372A  GLN*     3.1    21.7    +      -       +      +
    373A  GLU*     2.7    42.1    +      -       -      +
    375A  ARG*     1.3    81.4    -      -       +      +
    377A  ARG*     1.3    64.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 377 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    373A  GLU*     2.9    44.4    +      -       -      +
    374A  LEU*     2.9    20.2    -      -       +      +
    375A  ARG      4.2     1.4    -      -       -      +
    376A  LYS*     1.3    85.7    -      -       +      +
----------------------------------------------------------
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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