Contacts of the helix formed by residues 556 - 581 (chain C) in PDB entry 3K23


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 THR 556 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    555C  SER*     1.3    79.1    +      -       -      +
    557C  TRP*     1.3    67.4    +      -       -      +
    558C  ARG      3.1     1.9    +      -       -      -
    559C  ILE*     3.2     3.8    +      -       -      +
    560C  MET*     2.8    32.0    +      -       -      +
    637C  PRO*     3.0    38.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 557 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    555C  SER*     3.9     4.1    +      -       -      +
    556C  THR*     1.3    78.0    -      -       -      +
    558C  ARG*     1.3    63.1    +      -       +      +
    560C  MET*     4.7     3.8    -      -       -      -
    561C  THR*     2.6    79.3    +      -       +      -
    747C  ILE*     3.2    42.1    -      -       +      +
    748C  GLU*     5.9     1.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 558 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    548C  TYR*     3.6    30.4    +      -       +      +
    549C  ASP*     2.9    42.8    +      -       -      +
    552C  VAL*     3.3    27.8    +      -       -      +
    553C  PRO      3.1    28.1    +      -       -      -
    555C  SER*     3.9    18.8    +      -       -      +
    556C  THR      3.1     0.4    -      -       -      -
    557C  TRP*     1.3    84.1    -      -       +      +
    559C  ILE*     1.3    55.3    +      -       -      +
    561C  THR*     4.9     1.1    -      -       -      -
    562C  THR*     2.5    40.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 559 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3C  JZN      5.3     5.8    -      -       -      -
    548C  TYR*     3.3    34.5    -      -       +      +
    554C  ASP*     5.0     2.2    -      -       +      -
    555C  SER      3.2    24.0    -      -       -      +
    556C  THR*     3.2     3.9    +      -       -      +
    558C  ARG*     1.3    75.4    -      -       -      +
    560C  MET*     1.3    59.6    +      -       -      +
    562C  THR*     3.9     1.8    -      -       -      -
    563C  LEU*     3.0    55.8    +      -       +      +
    627C  LEU*     3.8    15.3    -      -       +      -
    629C  ILE*     4.4    17.9    -      -       +      -
    633C  ARG*     4.8    16.4    -      -       +      +
    639C  MET*     5.9     6.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 560 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3C  JZN      3.2    57.7    -      -       +      +
    556C  THR*     2.8    26.4    +      -       -      +
    557C  TRP*     4.0     3.6    -      -       -      +
    559C  ILE*     1.3    73.8    -      -       -      +
    561C  THR*     1.3    63.3    +      -       -      +
    563C  LEU*     3.4     1.6    +      -       -      +
    564C  ASN*     2.9    31.9    +      -       -      +
    637C  PRO*     5.7     4.5    -      -       +      -
    638C  GLY*     4.3    15.9    -      -       -      +
    639C  MET      5.1     0.4    -      -       -      +
    735C  TYR*     3.9    16.6    -      -       -      +
    739C  THR*     4.6    20.2    -      -       -      -
    747C  ILE*     4.7    16.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 561 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    557C  TRP*     2.6    74.8    +      -       +      -
    558C  ARG*     4.4     1.6    -      -       -      -
    560C  MET*     1.3    73.3    -      -       -      +
    562C  THR*     1.3    59.8    +      -       -      +
    564C  ASN*     3.8     5.5    +      -       -      +
    565C  MET*     3.4    45.2    +      -       +      +
    747C  ILE*     3.3    24.6    -      -       -      +
    748C  GLU*     4.2     3.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 562 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    546C  ALA*     3.5    42.5    -      -       +      +
    547C  GLY      5.1     1.6    +      -       -      -
    548C  TYR*     3.6    22.6    -      -       +      +
    558C  ARG*     2.5    25.7    +      -       -      +
    559C  ILE*     3.9     3.6    -      -       -      -
    560C  MET      3.3     0.2    -      -       -      -
    561C  THR*     1.3    76.2    -      -       -      +
    563C  LEU*     1.3    60.6    +      -       -      +
    565C  MET*     3.3    11.6    +      -       -      +
    566C  LEU*     3.0    23.4    +      -       -      +
    627C  LEU*     4.1     8.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 563 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3C  JZN      2.5    49.2    +      -       +      +
    559C  ILE*     3.0    44.2    +      -       +      +
    560C  MET      3.4     1.1    +      -       -      +
    562C  THR*     1.3    73.0    -      -       -      +
    564C  ASN*     1.3    54.4    +      -       -      +
    566C  LEU*     3.6     9.5    -      -       +      +
    567C  GLY*     2.6    28.4    +      -       -      -
    623C  PHE*     3.4    43.1    -      -       +      -
    627C  LEU*     3.0    32.5    -      -       +      -
    629C  ILE*     5.4     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 564 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3C  JZN      2.9    45.2    -      -       -      +
    560C  MET      2.9    15.9    +      -       -      +
    561C  THR*     3.9     6.3    -      -       -      +
    562C  THR      3.3     0.2    -      -       -      -
    563C  LEU*     1.3    73.1    -      -       -      +
    565C  MET*     1.3    55.9    +      -       +      +
    567C  GLY      3.2     0.5    +      -       -      -
    568C  GLY*     2.7    31.9    +      -       -      -
    747C  ILE*     2.8    36.7    -      -       -      +
    748C  GLU*     5.0     1.1    -      -       +      -
    749C  PHE*     3.1    31.7    -      -       -      +
    750C  PRO*     4.1     3.0    -      -       +      +
    753C  LEU*     3.2    13.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 565 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    546C  ALA      6.1     0.4    -      -       -      +
    561C  THR*     3.4    38.6    -      -       +      +
    562C  THR*     3.3     9.8    +      -       -      +
    564C  ASN*     1.3    77.0    -      -       -      +
    566C  LEU*     1.3    57.7    +      -       -      +
    568C  GLY*     3.2     2.8    +      -       -      -
    569C  ARG*     3.0    34.4    +      -       +      +
    748C  GLU*     3.8    31.9    -      -       +      +
    750C  PRO*     4.2    13.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 566 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3C  JZN      3.3    23.1    -      -       +      +
    544C  LEU*     4.0    24.9    -      -       +      +
    545C  TYR      3.7    27.4    -      -       -      +
    546C  ALA*     4.1     8.1    -      -       +      +
    562C  THR      3.0    17.5    +      -       -      +
    563C  LEU*     3.6    11.9    -      -       +      +
    565C  MET*     1.3    72.1    -      -       -      +
    567C  GLY*     1.3    65.4    +      -       -      +
    568C  GLY      3.0     1.1    -      -       -      -
    569C  ARG*     3.0    12.5    +      -       -      +
    570C  GLN*     2.8    32.7    +      -       -      +
    623C  PHE*     3.7    27.6    -      -       +      +
    624C  ALA*     4.5     3.1    -      -       +      -
    627C  LEU*     4.4     6.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 567 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3C  JZN      3.7    27.8    -      -       -      -
    563C  LEU      2.6    21.4    +      -       -      -
    564C  ASN      3.6     1.3    -      -       -      -
    566C  LEU*     1.3    72.5    -      -       -      +
    568C  GLY*     1.3    61.5    +      -       -      +
    570C  GLN*     3.2     0.8    +      -       -      -
    571C  VAL*     3.0    22.2    +      -       -      +
    604C  MET*     3.2    17.2    -      -       -      +
    753C  LEU*     4.1     5.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 568 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    564C  ASN      2.7    19.0    +      -       -      -
    565C  MET      3.4     5.4    -      -       -      -
    566C  LEU      3.0     0.6    -      -       -      -
    567C  GLY*     1.3    75.1    -      -       -      +
    569C  ARG*     1.3    60.1    +      -       -      +
    571C  VAL*     3.3    10.7    +      -       -      +
    572C  ILE*     3.4    21.7    +      -       -      +
    750C  PRO*     4.3    10.8    -      -       -      -
    752C  MET*     3.8     6.8    -      -       -      +
    753C  LEU*     3.9    17.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 569 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    640B  TYR*     4.0    14.6    -      -       -      +
    641B  ASP*     3.0    33.5    +      -       -      -
    544C  LEU*     3.6    25.0    -      -       +      +
    545C  TYR      2.9    30.5    +      -       -      +
    546C  ALA      5.3     1.2    +      -       -      -
    565C  MET*     3.0    14.2    +      -       +      +
    566C  LEU*     3.0    14.1    +      -       -      +
    568C  GLY*     1.3    75.3    -      -       -      +
    570C  GLN*     1.3    58.2    +      -       -      +
    571C  VAL      3.3     0.2    -      -       -      -
    572C  ILE*     3.7    17.6    +      -       +      +
    573C  ALA*     3.2    19.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 570 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3C  JZN      2.8    93.0    +      -       +      +
    542C  GLU      4.8     0.2    -      -       -      +
    544C  LEU*     3.8    27.8    +      -       +      +
    566C  LEU*     2.8    24.6    +      -       -      +
    567C  GLY      3.8     3.8    -      -       -      +
    569C  ARG*     1.3    75.7    -      -       -      +
    571C  VAL*     1.3    59.5    +      -       -      +
    573C  ALA*     3.5     5.9    -      -       +      +
    574C  ALA*     3.1    20.1    +      -       -      +
    604C  MET*     4.0     5.8    -      -       +      -
    611C  ARG*     3.6    23.4    +      -       -      -
    623C  PHE      4.6     1.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 571 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    567C  GLY      3.0    11.9    +      -       -      +
    568C  GLY      3.3     6.9    +      -       -      +
    570C  GLN*     1.3    74.9    -      -       -      +
    572C  ILE*     1.3    59.6    +      -       -      +
    573C  ALA      3.1     1.1    -      -       -      -
    574C  ALA*     2.7    28.7    +      -       +      +
    575C  VAL*     2.9    22.7    +      -       +      +
    596C  LEU*     6.3     1.8    -      -       +      -
    600C  TRP*     3.8    27.4    -      -       +      -
    604C  MET*     3.2    24.7    -      -       +      -
    752C  MET*     3.7    15.5    -      -       +      -
    753C  LEU*     4.0    10.3    -      -       +      -
    756C  ILE*     3.5    27.1    -      -       +      -
    745F  LEU*     6.3     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 572 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    568C  GLY      3.4    18.4    +      -       -      +
    569C  ARG*     3.7    21.3    -      -       +      +
    571C  VAL*     1.3    77.0    -      -       -      +
    573C  ALA*     1.3    61.0    +      -       -      +
    575C  VAL*     3.4    11.7    +      -       -      +
    576C  LYS*     3.3    21.0    +      -       +      +
    752C  MET*     3.4    31.2    -      -       +      -
    744F  LEU*     5.7     2.9    -      -       +      -
    748F  LEU*     3.7    22.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 573 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3C  JZN      4.4     2.5    -      -       +      -
    541C  PRO*     3.6    26.4    -      -       +      +
    542C  GLU*     5.7     1.3    -      -       +      +
    544C  LEU*     4.8    10.8    -      -       +      -
    569C  ARG      3.2    12.2    +      -       -      +
    570C  GLN*     3.5    13.5    -      -       +      +
    571C  VAL      3.1     0.2    -      -       -      -
    572C  ILE*     1.3    78.4    -      -       -      +
    574C  ALA*     1.3    63.6    +      -       -      +
    576C  LYS*     3.5     6.9    +      -       -      +
    577C  TRP*     3.0    23.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 574 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3C  JZN      4.1    18.2    -      -       +      -
    570C  GLN      3.1    13.7    +      -       -      +
    571C  VAL*     2.7    24.7    +      -       +      +
    573C  ALA*     1.3    70.0    -      -       -      +
    575C  VAL*     1.3    50.5    +      -       +      +
    577C  TRP*     3.2    10.7    +      -       +      +
    578C  ALA*     2.7    37.2    +      -       -      +
    596C  LEU*     4.5     6.2    -      -       +      +
    600C  TRP*     5.7     5.6    -      -       +      -
    603C  LEU*     4.8    17.0    -      -       +      -
    604C  MET*     6.2     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 575 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    571C  VAL*     2.9    28.2    +      -       +      +
    572C  ILE*     3.7    10.8    -      -       -      +
    574C  ALA*     1.3    74.3    -      -       +      +
    576C  LYS*     1.3    59.7    +      -       -      +
    578C  ALA*     3.8     0.5    -      -       -      +
    579C  LYS*     3.0    30.5    +      -       -      +
    596C  LEU*     4.2    16.4    -      -       +      -
    752C  MET*     4.9     2.2    -      -       +      -
    745F  LEU*     4.0    26.2    -      -       +      -
    748F  LEU*     3.6    35.4    -      -       +      +
    749F  LEU*     3.9    19.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 576 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    572C  ILE      3.3    11.0    +      -       -      +
    573C  ALA*     3.9     9.2    -      -       -      +
    574C  ALA      3.3     0.2    -      -       -      -
    575C  VAL*     1.3    75.6    -      -       -      +
    577C  TRP*     1.3    68.0    +      -       -      +
    579C  LYS*     3.5    20.6    -      -       -      +
    580C  ALA*     3.5     8.7    +      -       -      +
    748F  LEU*     5.3     1.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 577 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3C  JZN      5.5     3.4    -      +       -      -
    536C  LEU*     4.4     6.4    +      -       +      +
    539C  ILE*     3.4    52.1    -      -       +      +
    540C  GLU*     4.3     3.8    +      -       -      -
    541C  PRO*     3.7    22.9    -      -       +      -
    573C  ALA      3.0    14.6    +      -       -      +
    574C  ALA*     3.3    24.2    -      -       +      +
    576C  LYS*     1.3    73.6    -      -       -      +
    578C  ALA*     1.3    75.2    +      -       +      +
    580C  ALA*     2.8    21.3    +      -       -      +
    581C  ILE*     3.5    18.6    +      -       +      +
    596C  LEU*     6.2     0.2    -      -       +      -
    603C  LEU*     3.9    37.2    -      -       +      -
    664C  LEU      5.3     0.7    -      -       -      -
    667C  LYS*     3.5    23.4    -      -       +      +
    668C  THR*     3.6    25.4    -      -       -      -
    671C  LEU*     3.8    28.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 578 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    574C  ALA      2.7    19.5    +      -       -      +
    575C  VAL      3.8     2.7    -      -       -      +
    577C  TRP*     1.3    77.9    -      -       +      +
    579C  LYS*     1.3    55.3    +      -       -      +
    581C  ILE*     2.7    41.1    +      -       -      +
    584C  PHE*     3.6    32.0    -      -       +      +
    596C  LEU*     3.8    18.8    -      -       +      -
    671C  LEU*     4.3    10.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 579 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    744B  THR*     4.9    16.4    +      -       -      +
    575C  VAL      3.0    19.4    +      -       -      +
    576C  LYS*     3.5    11.7    -      -       -      +
    578C  ALA*     1.3    74.9    -      -       -      +
    580C  ALA*     1.3    58.2    +      -       -      +
    581C  ILE      3.6     1.9    +      -       -      +
    584C  PHE*     4.0     8.8    -      -       -      -
    585C  ARG*     3.9    36.7    +      -       +      +
    592C  GLN*     5.3     0.7    -      -       -      +
    748F  LEU      3.1    22.9    +      -       -      +
    749F  LEU*     3.1    43.1    +      -       +      +
    750F  ASP      4.6     6.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 580 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    535C  LEU*     4.0    11.3    -      -       -      +
    539C  ILE*     3.8    28.0    -      -       +      -
    576C  LYS      3.5     7.6    +      -       -      +
    577C  TRP      2.8    15.9    +      -       -      +
    579C  LYS*     1.3    73.6    -      -       -      +
    581C  ILE*     1.3    63.1    +      -       -      +
    582C  PRO*     3.5     6.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 581 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    536C  LEU*     4.4     4.5    -      -       +      -
    539C  ILE*     3.7    18.8    -      -       +      -
    577C  TRP*     3.6    39.5    -      -       +      +
    578C  ALA*     2.7    21.3    +      -       -      +
    579C  LYS      4.2     1.4    -      -       -      +
    580C  ALA*     1.3    71.7    -      -       -      +
    582C  PRO*     1.3    74.1    -      -       +      +
    583C  GLY      3.4     0.7    +      -       -      -
    584C  PHE*     3.1    23.9    +      -       +      +
    585C  ARG*     3.9     4.7    +      -       -      +
    668C  THR*     4.0    18.6    -      -       +      +
    671C  LEU*     4.3    11.7    -      -       +      -
    689C  ILE*     5.6     2.2    -      -       +      -
    693C  TYR*     3.1    34.1    -      -       +      +
----------------------------------------------------------
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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