Contacts of the helix formed by residues 410 - 439 (chain A) in PDB entry 5IWS


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 LEU 410 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    275A  TRP*     5.6     0.2    -      -       -      +
    278A  TRP*     3.6    34.1    -      -       +      -
    279A  ILE*     4.6     5.4    -      -       +      -
    282A  LEU*     4.2     0.7    -      -       +      -
    294A  TYR*     5.1     0.7    -      -       -      +
    298A  LEU*     4.3     9.2    -      -       +      -
    389A  ARG*     3.4    36.1    -      -       -      +
    405A  MSE      2.9    42.2    +      -       +      +
    408A  ALA*     3.6    24.9    -      -       +      +
    409A  GLY*     1.3    80.9    -      -       -      +
    411A  THR*     1.3    63.6    +      -       -      +
    412A  ARG      3.2     2.9    -      -       -      +
    413A  ASP*     3.1    20.3    +      -       -      +
    414A  LEU*     3.3    14.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 411 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    405A  MSE      4.0     1.0    +      -       -      -
    406A  VAL*     3.7    38.8    +      -       +      +
    409A  GLY*     3.4     3.9    -      -       -      -
    410A  LEU*     1.3    78.3    +      -       -      +
    412A  ARG*     1.3    65.2    +      -       -      +
    414A  LEU*     3.2     8.7    +      -       +      +
    415A  ILE*     2.9    40.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 412 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    387A  ASN*     6.0     1.8    -      -       +      +
    409A  GLY      5.0    11.4    +      -       -      +
    411A  THR*     1.3    80.4    -      -       -      +
    413A  ASP*     1.3    59.4    +      -       -      +
    415A  ILE*     3.2    10.5    +      -       +      +
    416A  ASN*     2.3    40.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 413 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    387A  ASN*     3.0    30.3    +      -       -      +
    388A  LEU*     4.3     0.7    -      -       -      +
    389A  ARG*     2.8    54.1    +      -       -      +
    390A  VAL*     4.3     3.4    -      -       +      +
    405A  MSE      4.2    14.8    -      -       +      -
    409A  GLY      5.0     0.3    -      -       -      +
    410A  LEU*     3.1    22.5    +      -       -      +
    412A  ARG*     1.3    79.7    -      -       -      +
    414A  LEU*     1.3    59.3    +      -       -      +
    416A  ASN*     3.4    10.8    -      -       -      +
    417A  PHE*     3.1    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 414 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    390A  VAL*     4.1    14.1    -      -       +      -
    398A  LEU*     4.7    10.5    -      -       +      +
    402A  THR*     3.7    37.0    -      -       +      +
    405A  MSE      3.6    48.5    -      -       +      -
    406A  VAL*     4.3     9.9    -      -       +      -
    410A  LEU      3.3     4.9    +      -       -      +
    411A  THR*     3.2    10.1    +      -       +      +
    413A  ASP*     1.3    76.2    -      -       -      +
    415A  ILE*     1.3    66.5    +      -       +      +
    417A  PHE*     3.3    11.2    +      -       +      +
    418A  VAL*     3.3    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 415 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    411A  THR*     2.9    39.2    +      -       +      +
    412A  ARG*     3.2     7.8    +      -       +      +
    414A  LEU*     1.3    77.5    -      -       +      +
    416A  ASN*     1.3    57.9    +      -       -      +
    418A  VAL*     3.1    23.2    +      -       -      +
    419A  ILE*     3.2    25.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 416 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    386A  ILE*     3.3    24.8    -      -       +      +
    387A  ASN*     3.0    23.7    +      -       -      +
    388A  LEU*     3.2    13.2    -      -       -      +
    412A  ARG*     2.3    43.4    +      -       -      +
    413A  ASP*     3.4     6.6    -      -       -      +
    415A  ILE*     1.3    74.7    -      -       +      +
    417A  PHE*     1.3    60.5    +      -       -      +
    419A  ILE*     3.7    19.6    -      -       +      +
    420A  VAL*     2.9    33.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 417 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308A  ALA*     4.6     3.1    -      -       +      -
    311A  VAL*     3.7    34.8    -      -       +      -
    312A  ILE*     3.8    27.6    -      -       +      -
    315A  THR*     4.3    12.8    -      -       +      -
    388A  LEU*     3.8    16.2    -      -       +      -
    390A  VAL*     4.4    20.2    -      -       +      -
    398A  LEU*     3.6    28.7    -      -       +      -
    413A  ASP      3.1    20.2    +      -       -      +
    414A  LEU*     3.4    15.5    -      -       +      +
    415A  ILE      3.1     0.4    -      -       -      -
    416A  ASN*     1.3    78.2    +      -       -      +
    418A  VAL*     1.3    67.0    +      -       +      +
    420A  VAL*     3.5     1.8    +      -       -      +
    421A  SER*     2.8    45.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 418 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    414A  LEU      3.4    15.3    -      -       -      +
    415A  ILE*     3.1     9.1    +      -       -      +
    417A  PHE*     1.3    82.8    -      -       +      +
    419A  ILE*     1.3    56.5    -      -       +      +
    421A  SER*     3.2     6.5    +      -       -      -
    422A  LEU*     2.7    55.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 419 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    415A  ILE*     3.2    23.7    +      -       +      +
    416A  ASN*     3.7    22.7    -      -       +      +
    417A  PHE      3.3     0.2    -      -       -      -
    418A  VAL*     1.3    77.2    -      -       +      +
    420A  VAL*     1.3    63.8    +      -       +      +
    422A  LEU*     3.4    10.0    +      -       +      +
    423A  VAL*     3.0    38.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 420 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    312A  ILE*     3.6    28.9    -      -       +      -
    382A  LEU*     3.6    26.0    -      -       +      -
    386A  ILE*     5.1     8.3    -      -       +      -
    388A  LEU*     4.4    11.9    -      -       +      -
    416A  ASN*     2.9    24.1    +      -       +      +
    417A  PHE*     3.9     4.7    -      -       -      +
    419A  ILE*     1.3    79.0    -      -       +      +
    421A  SER*     1.3    57.0    +      -       -      +
    423A  VAL*     3.4     5.1    +      -       -      +
    424A  PHE*     2.9    48.6    +      -       +      -
----------------------------------------------------------
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Residues in contact with SER 421 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    312A  ILE*     4.5    12.5    -      -       -      +
    315A  THR*     4.8     6.7    -      -       -      +
    316A  ALA*     3.2    29.1    -      -       -      +
    417A  PHE*     2.8    44.4    +      -       -      -
    418A  VAL*     3.2     8.9    +      -       -      -
    420A  VAL*     1.3    74.8    -      -       -      +
    422A  LEU*     1.3    61.6    +      -       -      +
    425A  PHE*     2.8    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 422 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418A  VAL*     2.7    42.1    +      -       +      +
    419A  ILE*     3.9     8.7    -      -       +      +
    421A  SER*     1.3    74.1    -      -       -      +
    423A  VAL*     1.3    64.6    +      -       +      +
    425A  PHE*     3.7     9.7    -      -       +      +
    426A  GLY*     3.5    14.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 423 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    419A  ILE*     3.0    30.5    +      -       +      +
    420A  VAL*     3.8     6.1    -      -       -      +
    422A  LEU*     1.3    76.6    -      -       +      +
    424A  PHE*     1.3    61.6    +      -       +      +
    426A  GLY*     3.2     2.8    +      -       -      -
    427A  LEU*     2.7    58.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 424 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    312A  ILE*     4.1    14.6    -      -       +      -
    317A  ALA*     4.0    19.4    -      -       +      -
    375A  THR*     3.5    25.4    -      -       -      -
    378A  LEU*     4.1    12.1    -      -       +      -
    379A  ALA*     3.6    30.1    -      -       +      -
    382A  LEU*     3.8    15.3    -      -       +      -
    420A  VAL*     2.9    45.8    +      -       +      +
    421A  SER      4.0     2.2    -      -       -      +
    423A  VAL*     1.3    82.3    -      -       +      +
    425A  PHE*     1.3    57.1    +      -       -      +
    427A  LEU*     3.9    11.2    -      -       +      -
    428A  ASN*     2.9    42.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 425 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    316A  ALA*     3.3    21.5    +      -       +      +
    319A  MSE      3.5    18.4    -      -       +      -
    320A  GLY*     3.3    38.9    -      -       -      -
    323A  PHE*     4.5    22.0    -      +       +      -
    421A  SER      2.8    17.7    +      -       -      +
    422A  LEU*     3.7    13.2    -      -       +      +
    423A  VAL      3.2     0.2    -      -       -      -
    424A  PHE*     1.3    77.9    -      -       -      +
    426A  GLY*     1.3    62.6    +      -       -      +
    429A  PHE*     2.9    36.2    +      +       +      +
----------------------------------------------------------
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Residues in contact with GLY 426 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    422A  LEU      3.5     6.7    +      -       -      -
    423A  VAL      3.2     4.7    +      -       -      -
    425A  PHE*     1.3    82.1    -      -       -      +
    427A  LEU*     1.3    65.2    +      -       -      +
    429A  PHE*     4.2     7.2    -      -       -      -
    430A  THR*     2.8    36.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 427 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    423A  VAL*     2.7    47.2    +      -       +      +
    424A  PHE*     3.8    15.5    -      -       +      +
    426A  GLY*     1.3    76.5    -      -       -      +
    428A  ASN*     1.3    63.2    +      -       -      +
    430A  THR*     3.6     5.4    +      -       -      +
    431A  LEU*     3.2    26.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 428 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    317A  ALA*     2.8    49.4    +      -       -      +
    320A  GLY      4.5     2.5    -      -       -      -
    321A  ILE*     3.9    19.5    -      -       +      +
    372A  TYR*     5.1     2.6    -      -       -      -
    375A  THR*     3.9    30.6    +      -       -      +
    376A  THR*     5.6     1.2    -      -       -      +
    424A  PHE*     2.9    22.8    +      -       -      +
    425A  PHE      4.2     0.9    -      -       -      +
    427A  LEU*     1.3    78.3    -      -       -      +
    429A  PHE*     1.3    60.8    +      -       -      +
    431A  LEU*     3.8     3.6    -      -       -      +
    432A  PHE*     2.9    41.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 429 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    320A  GLY*     3.5    26.4    +      -       -      +
    323A  PHE*     3.4    38.8    -      +       +      -
    324A  ALA*     3.5    24.9    -      -       +      +
    327A  ARG*     4.4    16.6    -      -       +      -
    425A  PHE*     2.9    24.8    +      +       +      +
    426A  GLY*     4.0     7.2    -      -       -      +
    427A  LEU      3.5     0.2    -      -       -      -
    428A  ASN*     1.3    76.9    -      -       -      +
    430A  THR*     1.3    68.3    +      -       +      +
    433A  ASN*     2.7    53.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 430 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    426A  GLY*     2.8    23.5    +      -       -      +
    427A  LEU*     3.6     8.7    +      -       -      +
    429A  PHE*     1.3    90.3    -      -       +      +
    431A  LEU*     1.3    62.9    +      -       -      +
    433A  ASN*     4.2     5.9    +      -       -      +
    434A  PHE*     3.2    24.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 431 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    371A  VAL*     3.9    15.9    -      -       +      -
    375A  THR*     3.9    28.5    -      -       +      -
    427A  LEU*     3.2    19.4    +      -       +      +
    428A  ASN*     3.9     7.9    -      -       -      +
    429A  PHE      3.2     0.4    -      -       -      -
    430A  THR*     1.3    83.1    +      -       -      +
    432A  PHE*     1.3    63.6    +      -       +      +
    434A  PHE*     3.4     8.1    +      -       +      +
    435A  LEU*     3.1    53.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 432 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    321A  ILE*     3.5    51.4    -      -       +      +
    324A  ALA*     3.9    15.3    -      -       +      -
    325A  MSE      5.5     0.4    -      -       +      -
    361A  PHE*     3.9     7.2    -      +       -      -
    368A  LEU*     3.5    44.0    -      -       +      -
    371A  VAL*     5.3     2.0    -      -       +      -
    372A  TYR*     3.6    28.5    -      -       +      -
    375A  THR*     5.1     0.7    -      -       -      -
    428A  ASN*     2.9    39.2    +      -       -      +
    431A  LEU*     1.3    86.0    -      -       +      +
    433A  ASN*     1.3    61.3    +      -       -      +
    434A  PHE      3.1     1.8    -      -       -      -
    435A  LEU*     4.0     4.4    -      -       +      +
    436A  ILE*     3.0    41.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 433 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    324A  ALA*     3.7     8.8    -      -       +      +
    327A  ARG*     4.8     6.2    -      -       -      +
    328A  ASN*     3.3    25.4    +      -       -      +
    429A  PHE*     2.7    42.9    +      -       +      +
    430A  THR*     4.2     6.6    +      -       -      +
    432A  PHE*     1.3    72.8    -      -       -      +
    434A  PHE*     1.3    62.6    +      -       -      +
    437A  LYS*     3.3    52.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 434 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    430A  THR      3.2    20.7    +      -       -      +
    431A  LEU*     3.7     9.0    -      -       +      +
    432A  PHE      3.1     0.8    -      -       -      -
    433A  ASN*     1.3    79.5    -      -       -      +
    435A  LEU*     1.3    85.5    +      -       +      +
    437A  LYS*     3.4     3.4    +      -       -      +
    438A  LYS*     3.0    71.2    +      -       +      +
    439A  PHE*     5.1     3.8    -      +       -      -
----------------------------------------------------------
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Residues in contact with LEU 435 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    367A  VAL*     5.6     0.9    -      -       +      +
    368A  LEU*     3.7    31.9    -      -       +      -
    371A  VAL*     4.4    21.3    -      -       +      -
    431A  LEU*     3.1    36.3    +      -       +      +
    432A  PHE*     3.4     1.5    +      -       -      +
    434A  PHE*     1.3    95.9    -      -       +      +
    436A  ILE*     1.3    62.0    +      -       -      +
    439A  PHE*     3.4    45.6    +      -       +      -
    441A  LEU*     3.6    11.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 436 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    325A  MSE      3.7    39.7    -      -       +      +
    328A  ASN*     3.8    29.2    -      -       +      +
    368A  LEU*     4.7     6.1    -      -       +      -
    432A  PHE*     3.0    30.2    +      -       +      +
    433A  ASN      4.4     0.4    -      -       -      +
    435A  LEU*     1.3    76.8    -      -       -      +
    437A  LYS*     1.3    58.4    +      -       -      +
    440A  ASN*     3.1     9.5    +      -       -      -
    441A  LEU*     3.1    50.1    +      -       +      +
    443A  THR*     3.7     8.7    -      -       +      -
    446A  ARG*     3.4    24.8    +      -       -      +
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Residues in contact with LYS 437 (chain A). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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    327A  ARG*     6.0     2.2    -      -       -      +
    328A  ASN*     3.2    25.6    -      -       -      +
    433A  ASN*     3.3    38.2    +      -       -      +
    434A  PHE*     3.4     4.4    +      -       -      +
    435A  LEU      3.3     0.2    -      -       -      -
    436A  ILE*     1.3    77.9    -      -       -      +
    438A  LYS*     1.3    68.2    +      -       +      +
    440A  ASN*     3.8     6.6    +      -       -      +
    446A  ARG*     4.9     8.4    +      -       -      +
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Residues in contact with LYS 438 (chain A). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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    434A  PHE*     3.0    56.7    +      -       +      +
    436A  ILE      3.5     0.2    -      -       -      -
    437A  LYS*     1.3    83.7    -      -       +      +
    439A  PHE*     1.3    80.5    +      -       +      +
    440A  ASN*     3.8     0.5    +      -       -      +
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Residues in contact with PHE 439 (chain A). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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    367A  VAL*     6.1     4.9    -      -       +      -
    434A  PHE*     5.1     4.3    -      +       -      -
    435A  LEU*     3.4    42.8    +      -       +      -
    438A  LYS*     1.3    89.9    -      -       +      +
    440A  ASN*     1.3    72.7    +      -       -      +
    441A  LEU*     3.4    19.3    +      -       +      +
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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) +   -    +    +   +   +    +    -
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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