Contacts of the helix formed by residues 438 - 461 (chain A) in PDB entry 6UZA


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 GLY 438 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    391A  TRP      5.4     0.2    -      -       -      -
    393A  GLU*     3.8    13.9    -      -       -      -
    394A  ASN*     4.9     4.5    -      -       -      -
    395A  LEU*     6.3     1.6    -      -       -      -
    434A  LYS      4.2     2.6    +      -       -      -
    435A  ILE      3.2    13.6    +      -       -      -
    437A  ARG*     1.3    82.2    -      -       -      +
    439A  PRO*     1.3    75.9    -      -       -      +
    440A  PHE      3.4     2.5    -      -       -      -
    441A  MET*     3.8     2.8    +      -       -      -
    442A  LYS*     3.2    22.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 439 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    360A  ARG*     4.6     6.1    -      -       -      +
    390A  ILE      3.4    26.7    -      -       -      +
    391A  TRP*     3.6    33.8    -      -       +      +
    393A  GLU*     3.8    12.3    -      -       +      +
    437A  ARG      4.4     1.6    -      -       -      +
    438A  GLY*     1.3    85.3    -      -       -      +
    440A  PHE*     1.3    55.6    +      -       -      +
    442A  LYS*     3.4     4.8    +      -       +      +
    443A  PHE*     2.9    28.1    +      -       -      +
    753A  TYR*     3.9    25.7    -      -       +      +
    754A  PHE*     3.6    21.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 440 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    391A  TRP*     3.4    47.0    +      +       -      +
    392A  TYR*     3.7    20.2    -      +       +      -
    395A  LEU*     3.6    26.2    -      -       +      +
    398A  LEU*     4.1    24.5    -      -       +      -
    406A  LYS*     4.2    28.7    -      -       +      -
    409A  VAL*     5.6     0.9    -      -       +      -
    438A  GLY      3.4     0.8    -      -       -      -
    439A  PRO*     1.3    76.6    -      -       -      +
    441A  MET*     1.3    61.2    +      -       -      +
    443A  PHE*     3.3     8.7    +      +       -      +
    444A  VAL*     2.9    48.8    +      -       +      +
   1004A  Y01      3.6    24.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 441 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    395A  LEU*     3.8    25.2    -      -       +      +
    398A  LEU*     4.5    15.9    -      -       -      -
    409A  VAL*     5.4     6.3    -      -       +      -
    413A  VAL*     4.4    24.7    -      -       +      -
    420A  LEU*     5.9     2.7    -      -       +      -
    432A  MET*     6.2     3.8    -      -       +      -
    435A  ILE*     3.5    39.5    -      -       +      +
    436A  MET*     4.1    23.1    -      -       +      -
    438A  GLY*     3.8     3.7    +      -       -      +
    439A  PRO      3.4     0.4    -      -       -      -
    440A  PHE*     1.3    74.3    -      -       -      +
    442A  LYS*     1.3    59.8    +      -       -      +
    444A  VAL*     3.7    13.2    -      -       +      +
    445A  ALA*     2.9    30.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 442 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    436A  MET      4.6     4.2    +      -       -      +
    437A  ARG*     4.0    15.7    +      -       -      +
    438A  GLY      3.2    20.5    +      -       -      +
    439A  PRO*     3.5     5.6    -      -       +      +
    441A  MET*     1.3    76.7    -      -       -      +
    443A  PHE*     1.3    56.4    +      -       -      +
    445A  ALA*     3.4     4.6    +      -       -      +
    446A  HIS*     3.0    41.4    +      -       +      -
    753A  TYR*     3.3    28.1    +      -       +      -
    754A  PHE      5.1     0.6    -      -       -      -
    755A  GLU      3.4    18.0    +      -       -      -
    756A  GLU*     5.0     1.2    -      -       -      +
    757A  GLY      4.8     5.7    -      -       -      +
    758A  ARG      3.6    17.0    +      -       -      +
    759A  THR*     4.1    29.3    +      -       +      +
   1001A  R0G      3.5    24.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 443 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    391A  TRP*     3.7    25.6    -      +       +      -
    439A  PRO      2.9    17.4    +      -       -      +
    440A  PHE*     3.3    17.2    +      +       -      +
    442A  LYS*     1.3    75.8    -      -       -      +
    444A  VAL*     1.3    61.5    +      -       +      +
    446A  HIS*     3.4     1.9    +      -       +      -
    447A  ALA*     2.9    29.4    +      -       +      +
    612A  TYR      4.6     2.5    -      -       -      -
    613A  ILE*     3.8    42.2    -      -       +      -
    616A  ALA*     3.7    29.6    -      -       +      -
    749A  LEU*     4.6     3.8    -      -       +      -
    753A  TYR*     3.5    33.8    -      +       +      -
   1004A  Y01      4.3    31.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 444 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    406A  LYS*     6.2     0.2    -      -       +      -
    409A  VAL*     4.2    10.3    -      -       +      +
    410A  VAL*     4.0    34.8    -      -       +      +
    413A  VAL*     3.9    27.4    -      -       +      -
    440A  PHE*     2.9    49.3    +      -       +      +
    441A  MET*     3.7    16.4    -      -       +      +
    442A  LYS      3.3     0.2    -      -       -      -
    443A  PHE*     1.3    79.3    -      -       +      +
    445A  ALA*     1.3    58.8    +      -       -      +
    447A  ALA*     3.4     2.6    +      -       -      +
    448A  ALA*     2.9    27.7    +      -       -      +
   1004A  Y01      6.0     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 445 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    413A  VAL*     4.2    19.1    -      -       +      -
    417A  LEU*     4.5     3.7    -      -       +      +
    441A  MET*     2.9    18.4    +      -       +      +
    442A  LYS*     3.7     6.7    -      -       -      +
    444A  VAL*     1.3    78.3    -      -       -      +
    446A  HIS*     1.3    57.5    +      -       +      +
    448A  ALA*     3.3     2.0    +      -       -      +
    449A  SER*     3.0    30.0    +      -       -      -
    759A  THR      4.9     5.4    -      -       -      +
    761A  PRO*     3.7    24.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 446 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    442A  LYS*     3.0    37.4    +      -       +      +
    443A  PHE      3.9     3.6    -      -       -      +
    445A  ALA*     1.3    77.2    -      -       -      +
    447A  ALA*     1.3    60.3    +      -       -      +
    449A  SER*     3.9     3.2    +      -       -      -
    450A  PHE*     3.7    13.7    +      -       -      +
    753A  TYR*     4.5     5.8    -      +       -      +
    758A  ARG*     3.5    26.0    +      -       +      -
    759A  THR      4.4     5.0    +      -       -      -
    760A  LEU      4.4     3.7    +      -       -      -
    761A  PRO*     4.1    30.0    -      -       +      +
    762A  VAL*     4.9     5.2    +      -       +      +
   1001A  R0G      3.4    65.8    -      +       +      -
----------------------------------------------------------
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Residues in contact with ALA 447 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    410A  VAL*     4.8     5.8    -      -       +      -
    443A  PHE*     2.9    18.6    +      -       +      +
    444A  VAL*     3.9     5.6    -      -       -      +
    445A  ALA      3.3     0.2    -      -       -      -
    446A  HIS*     1.3    77.0    -      -       -      +
    448A  ALA*     1.3    59.3    +      -       -      +
    450A  PHE*     3.2     8.7    +      -       -      +
    451A  THR*     3.0    31.2    +      -       -      +
    613A  ILE*     4.2    22.7    -      -       +      -
   1001A  R0G      4.5     0.4    -      -       -      -
   1004A  Y01      4.1    28.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 448 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    410A  VAL*     3.6    27.1    -      -       -      +
    413A  VAL*     3.9    10.8    -      -       +      +
    414A  ALA*     3.6    16.8    -      -       -      +
    417A  LEU*     4.8     2.5    -      -       +      -
    444A  VAL      2.9    17.4    +      -       -      +
    445A  ALA      3.3     4.5    +      -       -      +
    447A  ALA*     1.3    75.5    -      -       -      +
    449A  SER*     1.3    58.1    +      -       -      +
    450A  PHE      3.1     0.4    -      -       -      -
    451A  THR*     3.3     9.0    +      -       -      -
    452A  ILE*     3.0    35.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 449 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    417A  LEU*     4.1    14.7    -      -       -      +
    445A  ALA      3.0    15.9    +      -       -      -
    446A  HIS*     4.2     5.2    -      -       -      -
    447A  ALA      3.3     0.4    -      -       -      -
    448A  ALA*     1.3    76.2    -      -       -      +
    450A  PHE*     1.3    57.2    +      -       -      +
    452A  ILE*     4.1     6.3    -      -       -      -
    453A  PHE*     3.8     5.2    +      -       -      +
    501A  TRP*     3.1    21.0    +      -       -      -
    761A  PRO*     3.6    19.3    -      -       -      -
    762A  VAL*     3.4    13.0    -      -       -      +
    763A  PRO*     3.3    24.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 450 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    446A  HIS      3.7    11.4    +      -       -      +
    447A  ALA*     3.2     8.4    +      -       -      +
    448A  ALA      3.1     0.6    -      -       -      -
    449A  SER*     1.3    74.8    -      -       -      +
    451A  THR*     1.3    62.3    +      -       -      +
    452A  ILE      3.2     1.3    -      -       -      -
    453A  PHE*     3.3    14.7    +      +       -      +
    454A  LEU*     3.0    62.9    +      -       +      +
    505A  MET*     6.2     1.6    -      -       +      -
    606A  SER      3.5    25.8    -      -       -      -
    607A  PHE*     4.7     0.9    -      -       -      -
    609A  ARG*     3.7    34.1    -      -       +      -
    610A  ILE*     3.7    29.4    -      -       +      -
    613A  ILE*     4.5    17.0    -      -       +      -
   1001A  R0G      4.5    12.6    -      +       +      -
   1004A  Y01      5.1     4.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 451 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    410A  VAL*     4.4     6.2    -      -       -      +
    411A  LEU*     4.3    19.3    -      -       +      -
    414A  ALA*     4.8     8.3    -      -       +      -
    447A  ALA      3.0    15.1    +      -       -      -
    448A  ALA*     3.6    12.1    -      -       -      -
    450A  PHE*     1.3    79.3    -      -       -      +
    452A  ILE*     1.3    56.1    +      -       -      +
    454A  LEU*     3.5     6.6    +      -       -      +
    455A  GLY*     2.9    25.3    +      -       -      -
   1004A  Y01      3.5    48.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 452 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    414A  ALA*     3.3    34.5    -      -       +      +
    417A  LEU*     3.8    29.6    -      -       +      -
    448A  ALA      3.0    21.2    +      -       -      +
    449A  SER*     4.4     2.7    -      -       -      +
    451A  THR*     1.3    75.7    -      -       +      +
    453A  PHE*     1.3    57.6    +      -       -      +
    455A  GLY*     3.2     2.1    +      -       -      -
    456A  LEU*     2.9    37.7    +      -       +      +
    501A  TRP*     3.6    31.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 453 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    449A  SER      3.8     6.3    +      -       -      +
    450A  PHE*     3.3    23.9    +      +       +      +
    452A  ILE*     1.3    77.8    -      -       -      +
    454A  LEU*     1.3    62.4    +      -       +      +
    456A  LEU*     3.3    11.3    +      -       +      +
    457A  LEU*     3.0    47.3    +      -       +      +
    498A  ILE*     3.9    22.7    -      -       +      -
    501A  TRP*     3.8    46.2    -      +       +      +
    502A  VAL*     4.3     8.5    -      -       +      -
    505A  MET*     4.3    19.5    -      -       +      -
    533A  MET*     5.4     0.7    -      -       +      -
    537A  PHE*     4.1    25.6    -      +       -      -
    606A  SER*     4.2    15.0    -      -       -      -
    609A  ARG*     6.3     1.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 454 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    450A  PHE*     3.0    59.3    +      -       +      +
    451A  THR*     3.9     4.0    -      -       -      +
    453A  PHE*     1.3    79.3    -      -       +      +
    455A  GLY*     1.3    57.6    +      -       -      +
    457A  LEU*     3.3     8.5    +      -       +      +
    458A  VAL*     3.0    32.7    +      -       -      +
    606A  SER*     4.3    10.5    -      -       -      +
    607A  PHE*     3.9    41.3    -      -       +      -
    610A  ILE*     4.8     3.8    -      -       +      -
   1004A  Y01      3.9    40.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 455 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    451A  THR      2.9    15.5    +      -       -      -
    452A  ILE*     3.7     4.0    -      -       -      -
    454A  LEU*     1.3    76.1    -      -       -      +
    456A  LEU*     1.3    58.0    +      -       -      +
    458A  VAL*     3.4     2.8    +      -       -      +
    459A  MET*     2.9    37.3    +      -       -      +
   1004A  Y01      4.3    12.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 456 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    452A  ILE*     2.9    25.9    +      -       +      +
    453A  PHE*     3.6     9.2    -      -       +      +
    454A  LEU      3.3     0.2    -      -       -      -
    455A  GLY*     1.3    76.0    -      -       -      +
    457A  LEU*     1.3    57.3    +      -       -      +
    459A  MET*     6.0     0.4    -      -       +      -
    460A  ASN*     2.9    33.3    +      -       -      +
    493A  TRP*     6.1     2.9    -      -       +      -
    494A  MET*     3.8    27.5    -      -       +      +
    497A  LEU*     3.8    35.7    -      -       +      -
    498A  ILE*     4.2    17.5    -      -       +      +
    501A  TRP*     4.1    25.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 457 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    453A  PHE*     3.0    36.9    +      -       +      +
    454A  LEU*     3.3    13.4    +      -       +      +
    456A  LEU*     1.3    76.4    -      -       -      +
    458A  VAL*     1.3    63.9    +      -       +      +
    460A  ASN*     4.0     8.1    +      -       -      +
    461A  ALA*     4.6     1.4    +      -       -      +
    498A  ILE*     4.1    15.3    -      -       +      -
    537A  PHE*     4.2    10.8    -      -       +      -
    599A  TYR*     3.3    27.1    +      -       +      +
    603A  VAL*     3.8    28.0    -      -       +      +
    606A  SER*     3.3    26.7    -      -       -      +
    607A  PHE*     4.9     5.4    -      -       +      -
    650B  ILE*     4.4     5.7    -      -       +      +
    654B  ASN*     4.3    16.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 458 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    454A  LEU      3.0    21.4    +      -       -      +
    455A  GLY*     3.8     5.6    -      -       -      +
    457A  LEU*     1.3    79.1    -      -       -      +
    459A  MET*     1.3    75.3    +      -       +      +
    460A  ASN      3.2     2.1    +      -       -      -
    461A  ALA*     3.7     8.7    +      -       -      +
    465A  PHE*     3.9    30.2    -      -       +      -
    607A  PHE*     5.0     2.5    -      -       +      -
   1004A  Y01      3.8    23.8    -      -       +      -
    650B  ILE*     3.7    35.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 459 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    455A  GLY*     2.9    21.0    +      -       -      +
    456A  LEU*     6.0     0.4    -      -       +      -
    458A  VAL*     1.3    85.4    -      -       +      +
    460A  ASN*     1.3    64.0    +      -       -      +
    461A  ALA      3.4     0.2    -      -       -      -
    462A  ALA*     3.3    30.0    -      -       -      +
    465A  PHE*     4.6    13.7    -      -       +      -
    494A  MET*     3.3    29.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 460 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    456A  LEU      2.9    17.6    +      -       -      +
    457A  LEU      4.1     6.7    -      -       -      +
    458A  VAL      3.2     1.0    -      -       -      -
    459A  MET*     1.3    79.8    -      -       -      +
    461A  ALA*     1.3    59.5    +      -       -      +
    462A  ALA      3.2     4.7    +      -       -      -
    463A  ASP*     4.9     1.0    +      -       -      +
    464A  ARG*     5.1     1.9    +      -       -      -
    492A  SER*     5.5     3.5    -      -       -      -
    494A  MET*     3.7    20.1    -      -       -      +
    495A  GLU*     4.5    13.2    +      -       -      +
    498A  ILE*     4.1    16.2    -      -       +      +
    599A  TYR*     3.1    29.9    +      -       -      +
    654B  ASN*     6.2     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 461 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    457A  LEU      4.6     1.4    +      -       -      +
    458A  VAL      3.7     5.9    +      -       -      +
    460A  ASN*     1.3    79.3    -      -       +      +
    462A  ALA*     1.3    57.1    +      -       -      +
    463A  ASP      3.5     2.9    +      -       -      +
    464A  ARG*     3.4    43.3    +      -       -      +
    465A  PHE*     3.2    22.9    -      -       -      -
    653B  PHE*     3.6    12.4    -      -       +      -
    654B  ASN*     3.6    22.4    -      -       -      +
----------------------------------------------------------
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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