Contacts of the helix formed by residues 355 - 379 (chain A) in PDB entry 5BUK


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with PHE 355 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    173A  MET*     3.3    30.3    -      -       +      -
    305A  CYS*     4.1    22.0    -      -       +      -
    306A  GLY      3.6    18.6    -      -       -      -
    309A  PHE      4.3     1.1    -      -       -      -
    310A  LEU*     3.8    18.8    -      -       +      -
    340A  ASP*     3.2    19.1    -      -       +      +
    341A  ILE*     3.3    21.3    -      -       +      -
    344A  ALA*     4.2     9.2    -      -       +      -
    350A  TYR*     3.4    29.2    -      +       +      -
    351A  SER      3.7     4.3    -      -       -      -
    352A  LYS*     2.9    15.7    +      -       -      +
    354A  ARG*     1.3    91.7    -      -       +      +
    356A  ASP*     1.3    63.7    +      -       -      +
    357A  THR      3.2     2.7    -      -       -      -
    358A  TYR*     3.2     4.3    +      -       +      -
    359A  GLU*     2.9    24.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 356 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    352A  LYS*     4.0    10.2    +      -       -      +
    353A  LYS*     3.1    36.5    +      -       -      +
    354A  ARG      3.5     0.8    -      -       -      -
    355A  PHE*     1.3    77.8    -      -       -      +
    357A  THR*     1.3    62.0    +      -       -      +
    359A  GLU*     3.4    17.3    +      -       -      +
    360A  SER*     3.0    29.8    +      -       -      +
    357B  THR*     4.8    16.3    +      -       -      +
    364B  ARG*     6.4     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 357 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336A  ILE*     5.1     4.7    -      -       +      -
    340A  ASP*     3.7    16.9    +      -       -      +
    354A  ARG      5.1     0.4    +      -       -      -
    355A  PHE      3.2     0.6    -      -       -      -
    356A  ASP*     1.3    77.3    -      -       -      +
    358A  TYR*     1.3    67.4    +      -       -      +
    360A  SER*     3.3     5.3    +      -       -      -
    361A  MET*     2.9    45.7    +      -       +      +
    364B  ARG*     3.1    31.3    +      -       -      +
    406B  ASP*     3.2    23.1    +      -       +      +
    407B  ASP*     5.3     2.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 358 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    304A  VAL*     4.4     9.2    -      -       +      -
    305A  CYS*     5.2     1.6    -      -       +      -
    310A  LEU*     4.1    28.3    -      -       +      -
    311A  MET      2.6    29.9    +      -       -      -
    312A  VAL*     3.5    11.3    -      -       -      -
    333A  SER*     3.4    31.4    -      -       -      -
    336A  ILE*     3.8    15.7    -      -       +      -
    337A  ALA*     3.5    28.0    -      -       +      -
    340A  ASP*     2.8    28.7    +      -       +      +
    355A  PHE*     3.2     8.5    +      -       +      +
    357A  THR*     1.3    73.4    -      -       -      +
    359A  GLU*     1.3    60.3    +      -       -      +
    361A  MET*     3.9     0.2    -      -       -      -
    362A  LEU*     2.9    60.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 359 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303A  LYS*     5.8     1.7    -      -       -      +
    304A  VAL*     4.1    26.9    +      -       +      +
    305A  CYS*     3.7    12.8    -      -       -      -
    352A  LYS*     3.0    35.7    +      -       -      -
    355A  PHE      2.9    16.8    +      -       -      +
    356A  ASP*     3.6    13.4    -      -       -      +
    358A  TYR*     1.3    78.5    -      -       -      +
    360A  SER*     1.3    62.7    +      -       -      +
    362A  LEU*     4.0     2.0    -      -       -      +
    363A  ARG*     3.1    45.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 360 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    356A  ASP*     3.0    19.6    +      -       -      +
    357A  THR*     3.8     5.6    -      -       -      -
    359A  GLU*     1.3    78.4    +      -       -      +
    361A  MET*     1.3    63.0    +      -       -      +
    363A  ARG*     3.4    21.5    +      -       -      +
    364A  ARG*     2.9    29.7    +      -       -      +
    408A  GLU*     5.0     1.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 361 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336A  ILE*     4.0    25.1    -      -       +      -
    357A  THR*     2.9    32.4    +      -       +      +
    358A  TYR      4.0     1.8    -      -       -      +
    360A  SER*     1.3    75.1    -      -       -      +
    362A  LEU*     1.3    60.8    +      -       -      +
    364A  ARG*     3.5    42.6    -      -       -      +
    365A  GLY*     2.9    27.2    +      -       -      -
    405A  TYR*     3.9    22.9    -      -       +      +
    398B  LYS*     5.6     1.8    -      -       -      +
    406B  ASP*     3.5    39.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 362 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    304A  VAL*     4.2    18.4    -      -       +      -
    313A  GLY      5.8     0.9    -      -       -      +
    316A  ALA*     3.8    24.5    -      -       +      -
    317A  ARG*     5.1     6.5    +      -       +      -
    329A  VAL*     4.5     7.0    -      -       +      -
    333A  SER*     3.8    28.7    -      -       -      -
    358A  TYR*     2.9    44.5    +      -       +      +
    359A  GLU*     4.0     3.4    -      -       -      +
    361A  MET*     1.3    75.1    -      -       -      +
    363A  ARG*     1.3    65.6    +      -       -      +
    365A  GLY*     5.3     0.2    -      -       -      -
    366A  VAL*     3.0    43.2    +      -       +      +
    405A  TYR*     5.4     6.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 363 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    317A  ARG*     5.0     4.7    -      -       -      +
    359A  GLU*     3.1    45.5    +      -       -      +
    360A  SER*     3.6    31.5    +      -       -      +
    362A  LEU*     1.3    76.7    -      -       -      +
    364A  ARG*     1.3    57.4    +      -       -      +
    367A  ASN*     2.9    56.4    +      -       -      +
    408A  GLU*     5.9     2.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 364 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    360A  SER*     2.9    17.5    +      -       -      +
    361A  MET*     3.5    35.7    -      -       -      +
    363A  ARG*     1.3    79.2    -      -       -      +
    365A  GLY*     1.3    62.9    +      -       -      +
    367A  ASN*     3.7     4.5    -      -       -      +
    368A  ASN*     3.0    30.9    +      -       -      +
    404A  VAL      4.1     0.4    -      -       -      +
    405A  TYR*     2.9    35.8    +      -       -      +
    406A  ASP      3.6    14.1    +      -       -      -
    407A  ASP      3.6    21.1    -      -       -      +
    408A  GLU*     3.1    33.2    +      -       -      +
    110B  SER*     3.4    24.9    +      -       -      -
    406B  ASP*     5.4     2.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 365 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    361A  MET      2.9    20.0    +      -       -      -
    364A  ARG*     1.3    73.8    -      -       -      +
    366A  VAL*     1.3    59.6    +      -       -      +
    368A  ASN*     3.2     6.2    +      -       -      +
    369A  TRP*     3.1    22.3    +      -       -      -
    404A  VAL*     3.3    38.7    -      -       -      +
    405A  TYR*     3.9    10.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 366 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    317A  ARG*     3.5    42.2    -      -       +      +
    319A  VAL*     3.7    23.6    -      -       +      -
    329A  VAL*     4.0    32.3    -      -       +      -
    362A  LEU*     3.0    30.3    +      -       +      +
    365A  GLY*     1.3    74.6    -      -       -      +
    367A  ASN*     1.3    60.5    +      -       -      +
    369A  TRP*     3.4     6.4    +      -       +      +
    370A  TYR*     2.9    27.4    +      -       -      +
    405A  TYR*     5.4     3.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 367 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    317A  ARG*     2.7    32.4    +      -       -      +
    363A  ARG*     2.9    44.1    +      -       -      +
    364A  ARG*     3.7     5.3    -      -       -      +
    366A  VAL*     1.3    76.2    -      -       -      +
    368A  ASN*     1.3    60.4    +      -       -      +
    370A  TYR*     3.3     4.9    +      -       -      +
    371A  GLU*     2.9    31.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 368 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    364A  ARG*     3.0    17.1    +      -       -      +
    365A  GLY      3.2     8.9    +      -       -      +
    367A  ASN*     1.3    75.9    -      -       -      +
    369A  TRP*     1.3    65.2    +      -       -      +
    371A  GLU*     4.6     0.7    -      -       -      -
    372A  PHE*     3.0    24.3    +      -       -      +
    399A  MET*     4.8     1.8    -      -       -      -
    404A  VAL*     2.9    33.5    +      -       +      +
    407A  ASP      2.8    25.5    +      -       -      -
    408A  GLU      3.8     8.1    -      -       -      +
    410A  PRO*     3.2    30.5    -      -       +      +
    413A  LEU*     3.4    17.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 369 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  VAL*     4.8     1.8    -      -       +      -
    319A  VAL*     4.3    14.8    -      -       +      -
    323A  PHE*     3.5    45.8    -      +       +      -
    325A  SER*     3.5    26.7    -      -       -      -
    328A  SER*     4.1     8.0    +      -       -      -
    329A  VAL*     3.5    29.9    -      -       +      +
    365A  GLY      3.1    22.0    +      -       -      -
    366A  VAL*     3.6    13.2    -      -       +      +
    368A  ASN*     1.3    75.9    -      -       -      +
    370A  TYR*     1.3    58.6    +      -       -      +
    372A  PHE*     3.3    12.5    +      +       -      +
    373A  ILE*     2.8    37.0    +      -       +      +
    399A  MET      3.2    24.5    -      -       -      -
    400A  LEU*     4.7     4.5    -      -       -      -
    402A  GLY*     3.5    25.1    +      -       -      -
    404A  VAL*     3.6    20.2    -      -       +      +
    405A  TYR*     4.3     2.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 370 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    194A  ASP*     2.6    33.3    +      -       -      -
    195A  PRO*     5.7     0.3    -      -       -      +
    197A  PHE*     3.4    27.8    -      +       -      -
    298A  SER*     4.9     6.1    -      -       -      -
    317A  ARG*     3.4    25.1    -      -       -      +
    319A  VAL*     4.0    20.0    -      -       +      -
    366A  VAL      2.9    17.7    +      -       -      +
    367A  ASN*     3.6     4.9    -      -       -      +
    369A  TRP*     1.3    76.4    -      -       -      +
    371A  GLU*     1.3    55.7    +      -       -      +
    373A  ILE*     3.4     7.9    +      -       +      +
    374A  SER*     2.7    50.5    +      -       -      -
    440A  ALA*     4.5    16.9    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 371 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    367A  ASN      2.9    16.9    +      -       -      +
    368A  ASN*     3.8     3.1    -      -       -      +
    370A  TYR*     1.3    78.1    -      -       +      +
    372A  PHE*     1.3    66.1    +      -       -      +
    374A  SER*     3.2    11.7    +      -       -      -
    375A  ILE*     3.0    37.9    +      -       +      +
    413A  LEU*     3.8    25.8    -      -       +      +
    417A  ARG*     3.2    43.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 372 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    323A  PHE*     3.6    17.9    -      +       +      -
    368A  ASN      3.0    18.9    +      -       -      +
    369A  TRP*     3.4    13.5    -      +       -      +
    371A  GLU*     1.3    79.2    -      -       -      +
    373A  ILE*     1.3    62.2    +      -       -      +
    375A  ILE*     3.3     4.8    +      -       +      +
    376A  TYR*     3.0    20.7    +      -       -      +
    383A  PHE*     3.8    29.6    -      +       -      -
    396A  VAL*     3.9    17.3    -      -       +      -
    399A  MET*     3.5    28.5    -      -       +      -
    400A  LEU*     3.4    34.3    -      -       +      -
    413A  LEU*     3.9    20.9    -      -       +      -
    416A  MET*     3.9    20.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 373 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    197A  PHE*     4.1    12.3    -      -       +      -
    319A  VAL*     3.6    31.4    -      -       +      -
    320A  ASP*     3.0    36.8    -      -       +      +
    322A  ILE*     4.0     8.5    -      -       +      -
    323A  PHE*     3.7    24.9    -      -       +      -
    325A  SER*     5.0     2.7    -      -       -      +
    369A  TRP*     2.8    24.1    +      -       +      +
    370A  TYR*     3.7     6.3    -      -       +      +
    372A  PHE*     1.3    76.6    -      -       -      +
    374A  SER*     1.3    61.3    +      -       -      +
    376A  TYR*     3.2     4.0    +      -       -      +
    377A  TYR*     3.1    44.0    +      -       +      -
----------------------------------------------------------
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Residues in contact with SER 374 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    197A  PHE*     4.1    17.4    -      -       -      -
    370A  TYR*     2.7    46.8    +      -       -      -
    371A  GLU*     3.2    14.7    +      -       -      -
    373A  ILE*     1.3    74.3    -      -       -      +
    375A  ILE*     1.3    53.2    +      -       -      +
    377A  TYR*     3.3     3.5    +      -       -      +
    378A  ARG*     2.7    38.3    +      -       -      +
    438A  LEU*     4.7     1.6    -      -       -      +
    440A  ALA*     4.8    14.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 375 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    371A  GLU*     3.0    37.8    +      -       +      +
    372A  PHE*     3.6     7.6    -      -       +      +
    374A  SER*     1.3    74.8    -      -       -      +
    376A  TYR*     1.3    65.8    +      -       -      +
    378A  ARG*     4.3     4.9    -      -       -      +
    379A  LEU      2.9    30.7    +      -       -      +
    382A  LEU*     4.4     6.3    -      -       +      -
    383A  PHE*     5.0     4.0    -      -       +      +
    413A  LEU*     4.1    15.3    -      -       +      +
    416A  MET*     3.8    49.4    -      -       +      -
    417A  ARG*     4.2     7.4    -      -       +      +
    420A  VAL*     4.2    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 376 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77A  TRP*     4.0    23.3    -      +       +      +
     78A  THR      5.1     0.3    +      -       -      -
    226A  ILE*     3.9    19.1    +      -       -      +
    228A  PHE*     3.4    42.7    -      +       +      +
    235A  TRP*     4.6     1.7    -      +       -      +
    322A  ILE*     3.3    39.3    -      -       +      -
    323A  PHE*     3.9    10.8    -      +       +      -
    372A  PHE*     3.0    12.1    +      -       -      +
    373A  ILE      3.2     8.7    +      -       -      +
    375A  ILE*     1.3    76.0    -      -       -      +
    377A  TYR*     1.3    71.2    +      +       -      +
    380A  ASN*     3.0    56.4    -      -       -      +
    383A  PHE*     3.9    32.5    -      +       +      +
----------------------------------------------------------
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Residues in contact with TYR 377 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    197A  PHE*     3.6    20.2    -      +       -      -
    199A  GLN*     3.7    13.2    +      -       -      +
    228A  PHE*     4.1    24.4    -      +       -      -
    233A  ASP*     3.8    34.4    +      -       +      +
    235A  TRP*     3.2    19.7    -      +       -      -
    320A  ASP*     2.5    29.7    +      -       -      -
    322A  ILE*     4.4     2.7    -      -       +      -
    373A  ILE*     3.1    28.2    +      -       +      -
    374A  SER      3.8     5.8    -      -       -      +
    376A  TYR*     1.3    94.2    -      +       -      +
    378A  ARG*     1.3    62.5    +      -       -      +
    379A  LEU      3.6     0.2    +      -       -      -
    380A  ASN*     4.5     3.8    +      -       -      +
    436A  GLY*     3.7    15.8    -      -       -      -
    438A  LEU*     3.7    37.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 378 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    374A  SER*     2.7    23.5    +      -       -      +
    375A  ILE*     4.2     3.8    -      -       -      +
    377A  TYR*     1.3    75.8    -      -       -      +
    379A  LEU*     1.3    56.0    +      -       -      +
    420A  VAL*     3.8    23.8    -      -       +      -
    424A  GLU*     2.7    40.0    +      -       -      +
    435A  LEU*     3.2    25.1    -      -       +      +
    436A  GLY      2.7    47.0    +      -       -      +
    437A  SER*     4.7     3.4    -      -       -      +
    438A  LEU      4.0    10.1    -      -       -      +
    439A  LYS*     3.8    34.9    -      -       +      +
    440A  ALA      6.0     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 379 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    375A  ILE*     2.9    17.7    +      -       -      +
    378A  ARG*     1.3    74.8    -      -       -      +
    380A  ASN*     1.3    65.6    +      -       -      +
    381A  ILE*     3.2    18.8    -      -       +      -
    382A  LEU*     3.0    43.5    +      -       +      +
    383A  PHE      3.5     3.3    +      -       -      -
    419A  ILE*     4.8     0.9    -      -       +      -
    420A  VAL*     4.3    19.1    -      -       +      -
    423A  VAL*     4.2    28.0    -      -       +      -
    431A  TRP*     4.1    18.8    -      -       +      +
    434A  PHE      3.8    26.5    -      -       -      +
    435A  LEU*     3.8    14.8    -      -       +      +
----------------------------------------------------------
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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