Contacts of the helix formed by residues 441 - 467 (chain A) in PDB entry 4K71


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 PRO 441 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    439A  LYS      4.0     1.7    -      -       -      +
    440A  HIS*     1.4    92.0    -      -       +      +
    442A  GLU*     1.3    56.6    +      -       -      +
    443A  ALA*     3.2     4.9    -      -       +      +
    444A  LYS*     2.7    44.5    +      -       +      +
    445A  ARG*     3.1    11.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 442 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    385A  GLN*     5.5     3.8    +      -       -      -
    389A  LYS*     4.3    28.6    +      -       +      +
    440A  HIS      3.6     1.0    +      -       -      -
    441A  PRO*     1.3    71.0    -      -       -      +
    443A  ALA*     1.3    61.2    +      -       -      +
    444A  LYS      3.3     1.0    +      -       -      -
    445A  ARG*     3.4    46.7    +      -       +      +
    446A  MET*     3.9     7.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 443 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    340A  ASP*     4.3    18.7    -      -       +      +
    385A  GLN*     6.0     3.4    -      -       -      +
    441A  PRO*     3.0     4.9    +      -       +      +
    442A  GLU*     1.3    78.9    -      -       -      +
    444A  LYS*     1.3    62.0    +      -       +      +
    447A  PRO*     3.4    18.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 444 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    340A  ASP*     5.0    13.5    -      -       -      +
    440A  HIS*     4.2    17.9    -      -       +      +
    441A  PRO*     2.7    29.4    +      -       +      +
    443A  ALA*     1.3    77.9    -      -       +      +
    445A  ARG*     1.3    62.2    +      -       -      +
    446A  MET      3.4     1.8    -      -       -      -
    447A  PRO*     3.6     9.3    -      -       +      +
    448A  CYS*     3.2    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 445 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    388A  ILE*     4.5     8.7    -      -       +      -
    389A  LYS*     6.4     1.6    -      -       -      +
    392A  CYS*     4.4    14.6    -      -       -      -
    396A  GLU*     5.2     5.1    +      -       -      -
    437A  CYS*     3.2    27.2    -      -       -      +
    438A  CYS*     2.9    26.5    +      -       -      +
    439A  LYS      4.7     3.2    +      -       -      -
    440A  HIS*     2.7    24.9    +      -       -      +
    441A  PRO*     3.1     7.1    +      -       -      +
    442A  GLU*     3.4    45.8    +      -       +      +
    444A  LYS*     1.3    76.9    -      -       -      +
    446A  MET*     1.3    59.4    +      -       -      +
    448A  CYS*     3.5     2.5    -      -       -      +
    449A  ALA*     2.8    32.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 446 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341A  TYR*     6.3     0.7    -      -       +      -
    342A  SER*     4.6     4.7    -      -       -      +
    345A  LEU*     3.6    29.6    -      -       +      -
    381A  VAL*     3.5    29.6    -      -       +      +
    384A  PRO*     3.8    17.0    -      -       +      -
    385A  GLN*     3.6    37.5    -      -       +      +
    388A  ILE*     3.6    24.0    -      -       +      -
    442A  GLU      3.9     6.5    +      -       -      +
    445A  ARG*     1.3    78.4    -      -       -      +
    447A  PRO*     1.3    69.0    -      -       +      +
    449A  ALA*     3.3     1.2    +      -       -      +
    450A  GLU*     2.9    39.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 447 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    340A  ASP      3.3    26.7    -      -       -      +
    341A  TYR*     4.2     1.3    -      -       -      -
    342A  SER*     3.6    25.4    -      -       -      +
    443A  ALA      3.4    21.3    -      -       -      +
    444A  LYS*     3.6    13.5    -      -       +      +
    446A  MET*     1.3    96.3    -      -       +      +
    448A  CYS*     1.3    61.4    +      -       -      +
    451A  ASP*     3.1    32.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 448 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    436A  LYS*     3.8    20.0    -      -       -      -
    437A  CYS*     2.1    49.3    -      -       +      -
    440A  HIS*     3.8    16.2    -      -       +      -
    444A  LYS      3.2    20.5    +      -       -      +
    445A  ARG      3.5     2.5    -      -       -      +
    447A  PRO*     1.3    77.2    -      -       -      +
    449A  ALA*     1.3    62.8    +      -       -      +
    451A  ASP*     4.2     1.9    -      -       -      +
    452A  TYR*     3.0    27.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 449 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    388A  ILE*     3.6    36.1    -      -       +      -
    433A  VAL*     3.8    16.1    -      -       +      +
    437A  CYS*     3.4    11.6    -      -       +      -
    445A  ARG      2.8    21.3    +      -       -      +
    446A  MET      3.3     0.2    +      -       -      -
    448A  CYS*     1.3    73.0    -      -       -      +
    450A  GLU*     1.3    58.9    +      -       -      +
    452A  TYR*     3.8     0.7    -      -       -      +
    453A  LEU*     2.8    39.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 450 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    342A  SER*     3.8    21.8    -      -       -      +
    344A  VAL*     4.0    15.2    -      -       +      +
    345A  LEU*     5.1     1.3    -      -       +      +
    348A  ARG*     2.9    37.6    +      -       -      +
    384A  PRO*     3.8    13.8    -      -       -      +
    388A  ILE*     3.9     9.4    -      -       -      +
    446A  MET*     2.9    22.2    +      -       -      +
    449A  ALA*     1.3    77.9    -      -       -      +
    451A  ASP*     1.3    62.2    +      -       -      +
    453A  LEU*     4.0     4.6    -      -       -      +
    454A  SER*     3.1    24.1    +      -       -      -
    485A  ARG*     3.1    37.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 451 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    195A  LYS*     6.5     0.9    -      -       +      -
    342A  SER*     3.3    20.4    -      -       -      -
    343A  VAL*     3.8    12.6    +      -       -      +
    344A  VAL*     3.1    24.3    +      -       -      +
    447A  PRO*     3.1    21.4    +      -       -      +
    448A  CYS*     4.2     2.5    -      -       -      +
    450A  GLU*     1.3    75.8    -      -       -      +
    452A  TYR*     1.3    60.8    -      -       -      +
    454A  SER*     3.0    22.3    +      -       -      -
    455A  VAL*     3.2    13.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 452 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    429A  ASN*     2.9    33.2    +      -       -      +
    430A  LEU*     4.5     1.3    -      -       -      -
    432A  LYS*     3.4    24.1    -      -       +      +
    433A  VAL*     3.6    38.6    -      -       +      -
    436A  LYS*     4.1    33.2    -      -       +      +
    437A  CYS*     4.6     4.0    -      -       -      -
    448A  CYS      3.0    20.5    +      -       -      +
    449A  ALA      3.9     1.6    -      -       -      +
    451A  ASP*     1.3    76.6    -      -       -      +
    453A  LEU*     1.3    64.8    +      -       +      +
    455A  VAL*     3.1    16.9    +      -       +      +
    456A  VAL*     3.0    40.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 453 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    387A  LEU*     5.2     7.4    -      -       +      -
    388A  ILE*     5.5     3.6    -      -       +      -
    430A  LEU*     3.6    31.4    -      -       +      +
    433A  VAL*     4.1    28.5    -      -       +      -
    449A  ALA*     2.8    30.1    +      -       +      +
    450A  GLU*     4.0     7.4    -      -       -      +
    452A  TYR*     1.3    76.2    -      -       +      +
    454A  SER*     1.3    63.6    +      -       -      +
    456A  VAL*     3.3     2.8    +      -       -      +
    457A  LEU*     2.9    32.5    +      -       +      +
    485A  ARG*     3.7    37.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 454 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    198A  LEU*     3.3    23.1    -      -       -      +
    344A  VAL*     4.0    24.7    -      -       -      +
    450A  GLU      3.1    16.0    +      -       -      -
    451A  ASP*     3.0    14.9    +      -       -      -
    453A  LEU*     1.3    74.5    -      -       -      +
    455A  VAL*     1.3    60.5    +      -       -      +
    457A  LEU*     4.0     6.5    -      -       -      +
    458A  ASN*     3.1    25.1    +      -       -      +
    481A  LEU      6.0     2.5    -      -       -      -
    484A  ARG*     5.2     8.0    +      -       -      +
    485A  ARG*     5.5     4.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 455 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    191A  ALA      5.7     0.2    -      -       -      +
    194A  ALA*     3.4    41.5    -      -       +      +
    195A  LYS*     4.2    21.1    -      -       +      +
    198A  LEU*     4.1    19.7    -      -       +      -
    451A  ASP      3.2    12.1    +      -       -      +
    452A  TYR*     3.1    20.8    +      -       +      +
    454A  SER*     1.3    80.3    +      -       -      +
    456A  VAL*     1.3    67.8    +      -       +      +
    458A  ASN*     3.4     5.6    +      -       -      +
    459A  GLN*     3.2    25.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 456 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    426A  VAL*     5.0     6.3    -      -       +      +
    429A  ASN*     4.1    25.4    -      -       +      +
    430A  LEU*     3.7    26.9    -      -       +      -
    452A  TYR*     3.0    52.4    +      -       +      +
    453A  LEU*     4.0     6.1    -      -       -      +
    455A  VAL*     1.3    73.9    -      -       +      +
    457A  LEU*     1.3    68.6    +      -       +      +
    459A  GLN*     3.1    20.4    +      -       -      +
    460A  LEU*     3.1    21.1    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    411A  TYR*     4.3    13.5    -      -       +      +
    426A  VAL*     6.1     0.2    -      -       +      -
    430A  LEU*     4.5    17.3    -      -       +      -
    453A  LEU*     2.9    23.7    +      -       +      +
    454A  SER*     4.1     4.5    -      -       -      +
    456A  VAL*     1.3    76.4    -      -       +      +
    458A  ASN*     1.3    57.9    +      -       -      +
    460A  LEU*     3.2    21.8    +      -       +      +
    461A  CYS*     2.9    32.7    +      -       -      -
    484A  ARG*     4.5     9.4    -      -       +      -
    485A  ARG*     3.8    42.0    -      -       +      +
    488A  PHE*     4.1    37.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 458 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    194A  ALA      4.9     0.6    +      -       -      -
    197A  ARG*     3.6    20.0    +      -       -      +
    198A  LEU*     3.3    44.4    -      -       +      +
    201A  ALA*     3.3    17.7    -      -       -      +
    454A  SER      3.1    19.0    +      -       -      +
    455A  VAL      3.6     5.9    +      -       -      +
    456A  VAL      3.2     0.2    -      -       -      -
    457A  LEU*     1.3    77.8    -      -       -      +
    459A  GLN*     1.3    57.0    +      -       -      +
    461A  CYS*     3.1     0.9    +      -       -      -
    462A  VAL*     2.9    34.3    +      -       -      +
    484A  ARG*     2.9    31.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 459 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    193A  SER*     5.9     0.4    +      -       -      -
    194A  ALA*     3.8    31.0    -      -       +      +
    197A  ARG*     5.3     9.0    -      -       +      +
    429A  ASN*     5.0     9.2    +      -       -      -
    455A  VAL*     3.2    11.1    +      -       -      +
    456A  VAL*     3.1    26.4    +      -       +      +
    458A  ASN*     1.3    79.4    -      -       -      +
    460A  LEU*     1.3    64.8    +      -       -      +
    462A  VAL*     3.6     8.3    +      -       +      +
    463A  LEU*     3.4    32.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 460 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    411A  TYR*     4.8     6.7    -      -       +      -
    415A  VAL*     6.3     0.9    -      -       +      -
    418A  MET*     3.2    33.7    -      -       +      -
    426A  VAL*     4.1    32.5    -      -       +      -
    456A  VAL*     3.1    13.8    +      -       +      +
    457A  LEU*     3.5    19.5    -      -       +      +
    459A  GLN*     1.3    76.4    -      -       -      +
    461A  CYS*     1.3    57.3    +      -       -      +
    463A  LEU*     3.5     2.4    +      -       -      +
    464A  HIS*     2.9    32.1    +      -       +      -
    473A  VAL*     4.4     7.4    -      -       +      -
    488A  PHE*     4.2    26.5    -      -       +      -
     59B  TRP*     3.9    13.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 461 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    457A  LEU      2.9    24.4    +      -       -      +
    458A  ASN*     3.1     4.9    +      -       -      +
    460A  LEU*     1.3    75.6    -      -       -      +
    462A  VAL*     1.3    65.8    +      -       +      +
    464A  HIS*     3.8     1.4    -      -       -      +
    465A  GLU*     3.0    26.7    +      -       -      +
    477A  CYS*     2.0    60.7    -      -       +      +
    484A  ARG*     3.9    24.9    -      -       -      +
    488A  PHE*     4.1    11.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 462 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108A  ASP*     3.7    35.1    -      -       +      +
    197A  ARG*     3.7    31.9    -      -       +      +
    201A  ALA*     4.4     5.2    -      -       +      -
    205A  LYS*     6.5     0.7    -      -       +      -
    458A  ASN*     2.9    39.1    +      -       -      +
    459A  GLN*     3.7    13.9    -      -       +      +
    460A  LEU      3.5     0.2    -      -       -      -
    461A  CYS*     1.3    74.4    -      -       +      +
    463A  LEU*     1.3    66.3    +      -       -      +
    465A  GLU*     3.6    12.6    +      -       -      +
    466A  LYS*     3.6    22.7    +      -       -      +
    484A  ARG*     6.2     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 463 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  ASP*     5.1     2.0    -      -       -      +
    108A  ASP*     3.6    22.7    -      -       +      +
    109A  ASN*     3.5    42.4    -      -       +      +
    425A  GLU*     5.2     4.0    -      -       -      +
    459A  GLN*     3.4    20.7    +      -       +      +
    460A  LEU*     5.5     0.4    -      -       -      -
    461A  CYS      3.2     0.4    -      -       -      -
    462A  VAL*     1.3    77.9    -      -       -      +
    464A  HIS*     1.3    64.6    +      -       -      +
    466A  LYS*     3.0    20.3    +      -       +      +
    467A  THR*     3.2    14.9    +      -       -      -
     59B  TRP*     3.4    45.5    -      -       +      +
     63B  LYS*     5.8     1.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 464 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418A  MET*     4.3    11.2    -      -       +      -
    460A  LEU*     2.9    23.9    +      -       +      +
    461A  CYS*     3.2     4.7    +      -       -      +
    463A  LEU*     1.3    73.6    -      -       -      +
    465A  GLU*     1.3    67.9    +      -       -      +
    467A  THR      4.4     0.4    -      -       -      -
    468A  PRO*     2.9    35.8    -      -       +      +
    469A  VAL*     3.2    40.4    +      -       +      +
    470A  SER      3.2    31.1    +      -       -      -
    473A  VAL*     3.6    28.1    -      -       +      +
    474A  THR*     3.2    19.8    +      -       -      -
    477A  CYS*     5.1     1.4    -      -       -      +
     59B  TRP*     3.9    14.7    -      +       +      -
----------------------------------------------------------
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Residues in contact with GLU 465 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205A  LYS*     2.9    45.0    +      -       -      +
    461A  CYS      3.0    15.3    +      -       -      +
    462A  VAL*     3.9    12.5    -      -       -      +
    464A  HIS*     1.3    81.3    +      -       -      +
    466A  LYS*     1.3    66.7    +      -       +      +
    468A  PRO*     3.8    10.6    -      -       -      +
    478A  THR*     6.4     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 466 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103A  LEU      5.8     0.2    +      -       -      -
    104A  GLN*     3.7    28.7    +      -       -      +
    106A  LYS      4.8    10.5    +      -       -      -
    108A  ASP*     5.3     7.9    +      -       -      +
    148A  TYR*     5.5     4.4    +      -       -      -
    197A  ARG*     5.6     3.8    -      -       -      +
    205A  LYS*     5.9     3.0    -      -       -      +
    462A  VAL      3.6    12.6    +      -       -      +
    463A  LEU*     3.0    15.9    +      -       +      +
    465A  GLU*     1.3    89.0    +      -       +      +
    467A  THR*     1.3    66.4    -      -       +      +
    468A  PRO*     3.6     5.4    -      -       -      +
     66B  THR*     4.3     8.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 467 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    463A  LEU      3.2     5.8    +      -       -      -
    464A  HIS      3.2     4.0    -      -       -      +
    466A  LYS*     1.3    87.2    -      -       +      +
    468A  PRO*     1.3    66.5    -      -       -      +
    469A  VAL*     3.6    10.3    +      -       -      +
     59B  TRP*     3.4    33.3    -      -       -      +
     62B  GLU*     3.6    13.5    -      -       -      +
     63B  LYS*     4.0    31.6    +      -       +      +
     66B  THR*     3.3    23.3    -      -       +      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il