2JK3

CRYSTAL STRUCTURE OF THE HLYIIR MUTANT PROTEIN WITH RESIDUES 169-186 SUBSTITUTED BY GSSGSSG LINKER


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Investigation of Transcriptional Regulator Hlyiir: Influence of a Disordered Region on Protein Fold and Dimerization.

Kovalevskiy, O.V.Solonin, A.S.Antson, A.A.

(2010) Proteins 78: 1870

  • DOI: 10.1002/prot.22700
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • B. cereus HlyIIR belongs to the TetR family of dimeric transcriptional regulators. Unlike other members of the TetR family, HlyIIR contains an insert between alpha-helices alpha8 and alpha9, which is located at the subunit-subunit interface. N-termin ...

    B. cereus HlyIIR belongs to the TetR family of dimeric transcriptional regulators. Unlike other members of the TetR family, HlyIIR contains an insert between alpha-helices alpha8 and alpha9, which is located at the subunit-subunit interface. N-terminal segment of this insert (amino acids, Pro161-Ser169) forms a short alpha-helix alpha8* that occupies a complementary cavity on the surface of the adjacent subunit, whereas the C-terminal segment comprising 16 amino acids (Leu170-Glu185) is disordered. To understand whether this disordered segment is important for protein's function, we determined crystal structures of two engineered HlyIIR proteins where this segment was either substituted by a seven-residue flexible Ser-Gly linker or replaced by a cleavable peptide containing proteolytic sites at both ends. Unexpectedly, alteration or proteolytic removal of the disordered segment resulted in changes in protein's conformation and in a remarkable rearrangement at the subunit-subunit interface. X-ray structures of the two engineered proteins revealed an unusual plasticity at the dimerization interface of HlyIIR enabling it to form dimers stabilized by different sets of interactions. Structural comparison indicates that in spite of the flexible nature of the disordered segment, it is critical for maintaining the native structure as it influences the position of alpha8*. The data demonstrate how disordered loops on protein surfaces may affect folding and subunit-subunit interactions.


    Organizational Affiliation

    York Structural Biology Laboratory, Department of Chemistry, University of York, Heslington, York, United Kingdom. oleg@ysbl.york.ac.uk




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HEMOLYSIN II REGULATORY PROTEIN
A, B
188Bacillus cereusMutation(s): 0 
Gene Names: hlyIIR
Find proteins for Q7X506 (Bacillus cereus)
Go to UniProtKB:  Q7X506
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.198 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 38.383α = 90.00
b = 78.990β = 90.00
c = 143.814γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-08-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.2: 2011-10-12
    Type: Database references, Derived calculations, Structure summary