Contacts of the helix formed by residues 506 - 531 (chain A) in PDB entry 2VWK


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 CYS 506 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    420A  PRO*     4.0    20.2    -      -       +      -
    423A  LEU*     4.4     5.8    -      -       -      -
    497A  TYR*     3.0    19.7    +      -       +      +
    504A  TRP      3.5     3.5    +      -       -      +
    505A  TYR*     1.3    79.8    -      -       -      +
    507A  LYS*     1.3    61.5    +      -       -      +
    508A  GLU*     3.2    19.5    -      -       -      -
    509A  CYS*     2.1    58.7    +      -       +      +
    510A  ALA      2.9    23.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 507 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    379A  ARG*     5.8     1.2    +      -       -      +
    383A  SER*     3.9    29.2    +      -       -      +
    497A  TYR      4.6     0.7    -      -       -      -
    498A  GLY*     5.4     1.8    -      -       -      -
    505A  TYR*     3.5    31.7    -      -       +      +
    506A  CYS*     1.3    71.8    -      -       -      +
    508A  GLU*     1.3    67.7    +      -       -      +
    510A  ALA*     3.2     9.8    +      -       +      +
    511A  GLU*     2.9    55.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 508 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    423A  LEU*     3.6    35.9    -      -       +      +
    424A  ASN*     5.4     0.7    -      -       -      +
    439A  HIS*     3.6    39.5    -      -       +      +
    441A  PHE*     4.3     1.6    -      -       -      -
    506A  CYS*     3.6    10.2    -      -       -      -
    507A  LYS*     1.3    88.5    +      -       -      +
    509A  CYS*     1.3    56.4    +      -       -      +
    511A  GLU*     3.7     6.4    +      -       -      +
    512A  SER*     2.6    35.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 509 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418A  VAL*     3.8    12.6    -      -       +      -
    419A  SER*     3.6    10.3    -      -       -      -
    420A  PRO*     3.6    21.8    -      -       -      -
    441A  PHE*     4.0    12.8    -      -       -      -
    497A  TYR*     3.7    19.5    -      -       +      -
    506A  CYS*     2.1    54.5    -      -       +      +
    508A  GLU*     1.3    72.5    -      -       -      +
    510A  ALA*     1.3    67.7    +      -       -      +
    512A  SER*     3.1     2.6    +      -       -      -
    513A  VAL*     2.9    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 510 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    494A  TYR*     3.6    16.7    -      -       +      +
    497A  TYR*     4.1     7.9    -      -       +      +
    498A  GLY*     4.0    27.4    -      -       -      +
    506A  CYS      2.9    12.4    +      -       -      +
    507A  LYS*     3.2    11.6    +      -       +      +
    509A  CYS*     1.3    77.0    -      -       -      +
    511A  GLU*     1.3    61.3    +      -       -      +
    513A  VAL*     3.3     2.1    +      -       -      -
    514A  THR*     2.9    27.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 511 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    436A  GLN*     4.6     4.3    -      -       -      +
    437A  VAL*     3.8    27.1    -      -       +      +
    439A  HIS*     3.7    15.4    +      -       -      -
    507A  LYS*     2.9    47.5    +      -       +      +
    508A  GLU*     3.7    10.3    -      -       -      +
    510A  ALA*     1.3    71.4    -      -       -      +
    512A  SER*     1.3    61.9    +      -       -      +
    514A  THR*     3.3     8.9    +      -       -      -
    515A  ALA*     2.9    29.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 512 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418A  VAL*     4.7     1.3    -      -       -      -
    434A  ALA*     3.4    13.6    -      -       -      +
    437A  VAL*     3.5     8.0    -      -       -      +
    439A  HIS*     3.4    14.7    -      -       -      -
    441A  PHE*     3.2    31.0    -      -       -      -
    508A  GLU      2.6    23.2    +      -       -      -
    509A  CYS      3.5     3.6    -      -       -      -
    511A  GLU*     1.3    78.1    -      -       -      +
    513A  VAL*     1.3    57.0    +      -       -      +
    515A  ALA*     3.2     3.2    +      -       -      +
    516A  TRP*     2.9    39.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 513 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    409A  TYR*     3.5    38.4    -      -       +      +
    412A  ILE*     4.3    16.6    -      -       +      +
    413A  ILE*     3.8    25.1    -      -       +      -
    418A  VAL*     3.9    19.1    -      -       +      -
    494A  TYR*     3.7    16.6    -      -       +      -
    497A  TYR*     4.6     5.2    -      -       +      -
    509A  CYS      2.9    22.3    +      -       -      +
    510A  ALA      3.7     4.7    -      -       -      +
    512A  SER*     1.3    72.1    -      -       -      +
    514A  THR*     1.3    65.8    +      -       -      +
    516A  TRP*     3.6     1.8    +      -       -      +
    517A  GLY*     3.0    21.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 514 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    385A  ALA*     5.9     6.1    -      -       +      -
    386A  GLY      5.4     6.7    -      -       -      +
    387A  GLY*     5.9     2.7    -      -       -      -
    388A  TYR      6.2     0.4    -      -       -      +
    409A  TYR*     4.5    11.7    +      -       -      +
    494A  TYR*     2.6    31.2    +      -       -      +
    510A  ALA      2.9    15.9    +      -       -      -
    511A  GLU*     3.6    11.2    -      -       -      -
    513A  VAL*     1.3    78.2    -      -       -      +
    515A  ALA*     1.3    56.6    +      -       -      +
    517A  GLY*     3.3     2.9    +      -       -      -
    518A  ARG*     3.1    44.6    +      -       +      +
    541A  THR*     6.6     0.2    -      -       +      -
   1780A  SO4      5.8     1.3    -      -       -      +
   1781A  SO4      5.1     8.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 515 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    435A  PRO*     3.2    35.5    -      -       +      +
    436A  GLN*     3.7    16.2    -      -       +      +
    437A  VAL*     4.8     0.4    -      -       +      -
    511A  GLU      2.9    17.5    +      -       -      +
    512A  SER*     3.6     4.9    -      -       -      +
    514A  THR*     1.3    74.4    -      -       -      +
    516A  TRP*     1.3    65.2    -      -       -      +
    518A  ARG*     3.2    20.5    +      -       -      +
    519A  GLN*     3.1    21.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 516 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    412A  ILE*     3.6    29.4    -      -       +      -
    416A  HIS*     3.2    51.9    +      +       +      -
    418A  VAL*     3.6    22.7    -      -       +      -
    432A  ASP*     3.9    12.8    -      -       +      -
    433A  VAL      3.3    19.7    +      -       -      -
    434A  ALA*     3.7    22.7    -      -       +      -
    435A  PRO*     3.6    26.2    -      -       +      +
    441A  PHE*     4.0    14.6    -      +       -      -
    512A  SER*     2.9    23.4    +      -       -      +
    513A  VAL      4.0     0.2    -      -       -      +
    515A  ALA*     1.3    72.6    -      -       -      +
    517A  GLY*     1.3    66.9    +      -       -      +
    519A  GLN*     3.2     9.8    +      -       -      +
    520A  TYR*     3.0    45.0    +      +       -      -
----------------------------------------------------------
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Residues in contact with GLY 517 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    408A  LEU*     4.4     8.2    -      -       -      +
    409A  TYR*     4.2    16.8    -      -       -      -
    412A  ILE*     3.9    10.0    -      -       -      +
    513A  VAL      3.0    15.3    +      -       -      -
    514A  THR      3.6     5.2    -      -       -      -
    515A  ALA      3.2     0.4    -      -       -      -
    516A  TRP*     1.3    76.8    -      -       -      +
    518A  ARG*     1.3    60.9    +      -       -      +
    520A  TYR*     3.3     1.6    +      -       -      +
    521A  ILE*     3.0    34.7    +      -       -      +
    541A  THR*     6.3     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 518 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    387A  GLY*     4.9     4.2    -      -       -      -
    388A  TYR*     3.8    36.7    -      -       +      +
    436A  GLN*     2.5    42.4    +      -       -      +
    514A  THR*     3.1    32.1    +      -       +      +
    515A  ALA*     3.2    20.6    +      -       -      +
    517A  GLY*     1.3    73.9    -      -       -      +
    519A  GLN*     1.3    53.0    +      -       -      +
    521A  ILE*     3.4     8.3    +      -       -      +
    522A  GLU*     2.7    59.1    +      -       -      +
    541A  THR*     5.8     1.3    -      -       +      -
   1780A  SO4      4.1    19.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 519 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    435A  PRO*     3.1    32.4    -      -       +      +
    515A  ALA      3.1    12.5    +      -       -      +
    516A  TRP*     3.2    13.4    +      -       -      +
    518A  ARG*     1.3    76.9    -      -       -      +
    520A  TYR*     1.3    83.5    +      -       -      +
    522A  GLU*     3.3    11.1    +      -       -      +
    523A  THR*     2.8    50.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 520 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    405A  PHE*     3.7    14.6    -      -       +      -
    408A  LEU*     4.8     2.2    -      -       +      -
    412A  ILE*     3.4    17.5    -      -       +      -
    416A  HIS*     2.6    32.6    +      -       -      -
    516A  TRP*     3.0    46.0    +      +       -      +
    517A  GLY      4.0     2.5    -      -       -      +
    519A  GLN*     1.3    87.6    +      -       -      +
    521A  ILE*     1.3    63.8    +      -       -      +
    523A  THR*     3.5     6.8    +      -       -      -
    524A  THR*     2.7    32.4    +      -       -      -
    571A  LEU*     4.0    15.5    -      -       +      -
    572A  PRO*     3.5    30.6    -      -       +      +
    575A  LEU*     3.2    31.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 521 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    388A  TYR*     3.7    32.3    -      -       +      +
    405A  PHE*     3.8    23.6    -      -       +      -
    408A  LEU*     3.9    14.6    -      -       +      -
    517A  GLY      3.0    21.6    +      -       -      +
    518A  ARG*     3.7     5.2    -      -       -      +
    520A  TYR*     1.3    76.8    -      -       -      +
    522A  GLU*     1.3    63.7    +      -       -      +
    524A  THR*     3.7     1.7    -      -       -      -
    525A  ILE*     3.1    33.0    +      -       +      +
    539A  ALA*     4.9     1.1    -      -       +      -
    540A  ASP      3.7     7.6    -      -       -      +
    541A  THR*     3.6    39.7    -      -       +      -
    543A  GLY*     5.8     2.0    -      -       -      +
    544A  PHE*     5.2     6.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 522 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    388A  TYR*     3.6    27.9    -      -       +      +
    518A  ARG*     2.7    48.4    +      -       -      +
    519A  GLN*     3.6     9.4    +      -       -      +
    521A  ILE*     1.3    75.1    -      -       -      +
    523A  THR*     1.3    59.4    +      -       +      +
    525A  ILE*     3.5     6.0    +      -       -      +
    526A  ARG*     3.1    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 523 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    519A  GLN*     2.8    39.7    +      -       +      +
    520A  TYR*     3.7    12.5    +      -       -      -
    522A  GLU*     1.3    76.7    -      -       +      +
    524A  THR*     1.3    63.2    +      -       -      +
    526A  ARG*     3.7    12.4    +      -       -      +
    527A  GLU*     3.2    30.9    +      -       -      +
    571A  LEU*     5.3     4.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 524 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    405A  PHE*     3.3    17.4    -      -       +      -
    520A  TYR      2.7    22.2    +      -       -      -
    521A  ILE      3.7     3.6    -      -       -      -
    523A  THR*     1.3    75.7    +      -       -      +
    525A  ILE*     1.3    58.9    +      -       -      +
    527A  GLU*     3.3     6.6    +      -       -      +
    528A  ILE*     2.9    25.5    +      -       -      +
    544A  PHE*     4.1    11.9    -      -       +      -
    563A  PHE*     3.6    23.9    -      -       +      -
    567A  ILE*     4.4    11.1    -      -       +      +
    571A  LEU*     4.3    12.4    -      -       +      +
    577A  LEU*     3.7    25.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 525 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    388A  TYR*     3.3    26.9    -      -       -      +
    390A  LYS*     4.1    16.6    -      -       +      -
    521A  ILE*     3.1    25.2    +      -       +      +
    522A  GLU*     3.8     4.7    -      -       -      +
    524A  THR*     1.3    72.3    -      -       -      +
    526A  ARG*     1.3    67.4    +      -       -      +
    528A  ILE*     3.1     7.4    +      -       -      +
    529A  GLU*     3.1    36.5    +      -       -      +
    536A  VAL*     3.8    20.9    -      -       +      -
    539A  ALA*     3.6    21.3    -      -       +      -
    544A  PHE*     4.0    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 526 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    522A  GLU      3.1    17.7    +      -       -      +
    523A  THR*     3.8    13.0    -      -       -      +
    525A  ILE*     1.3    78.3    -      -       -      +
    527A  GLU*     1.3    62.4    +      -       +      +
    529A  GLU*     3.4     4.2    +      -       -      -
    530A  GLU*     3.0    59.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 527 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    523A  THR*     3.2    19.2    +      -       -      +
    524A  THR*     3.5     6.5    -      -       -      +
    525A  ILE      3.1     0.6    -      -       -      -
    526A  ARG*     1.3    79.5    -      -       +      +
    528A  ILE*     1.3    64.7    +      -       -      +
    530A  GLU*     4.6     3.1    -      -       -      +
    531A  LYS*     3.1    35.9    +      -       -      +
    532A  PHE      3.8     0.5    +      -       -      -
    563A  PHE*     4.1    13.4    -      -       +      -
    566A  TYR*     2.8    32.4    +      -       +      -
    567A  ILE*     4.5     9.2    -      -       +      +
    570A  LYS*     2.9    21.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 528 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    403A  LEU*     3.9    18.4    -      -       +      -
    524A  THR      2.9    14.0    +      -       -      +
    525A  ILE*     3.1    10.5    +      -       -      +
    527A  GLU*     1.3    73.2    -      -       -      +
    529A  GLU*     1.3    64.0    +      -       +      +
    532A  PHE*     3.4     5.4    -      -       +      +
    533A  GLY      3.3     6.4    +      -       -      -
    534A  PHE*     3.2    60.8    +      -       +      -
    536A  VAL*     3.6    25.8    -      -       +      -
    544A  PHE*     4.0    13.0    -      -       +      -
    546A  ALA*     4.8     1.1    -      -       +      -
    560A  ALA*     5.4     0.2    -      -       -      -
    563A  PHE*     3.5    47.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 529 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    390A  LYS*     4.5    11.1    +      -       -      -
    525A  ILE*     3.1    25.1    +      -       -      +
    526A  ARG*     3.9     5.1    -      -       -      +
    528A  ILE*     1.3    79.4    -      -       +      +
    530A  GLU*     1.3    65.1    +      -       +      +
    533A  GLY*     3.3    20.8    +      -       -      -
    534A  PHE      3.7    14.9    -      -       -      +
    535A  LYS*     3.8     8.5    -      -       -      +
    536A  VAL*     3.1    43.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 530 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    526A  ARG*     3.0    51.0    +      -       -      +
    527A  GLU*     4.6     3.1    -      -       -      +
    529A  GLU*     1.3    85.3    -      -       +      +
    531A  LYS*     1.3    64.8    +      -       -      +
    532A  PHE      3.4     0.4    +      -       -      -
    533A  GLY*     4.5     1.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 531 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    527A  GLU*     3.1    26.9    +      -       -      +
    530A  GLU*     1.3    78.8    -      -       -      +
    532A  PHE*     1.3    82.8    +      -       +      +
    566A  TYR*     4.0    22.0    -      -       +      +
----------------------------------------------------------
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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