2FYI

Crystal Structure of the Cofactor-Binding Domain of the Cbl Transcriptional Regulator


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.184 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Basis of the Sulphate Starvation Response in E. coli: Crystal Structure and Mutational Analysis of the Cofactor-binding Domain of the Cbl Transcriptional Regulator.

Stec, E.Witkowska-Zimny, M.Hryniewicz, M.M.Neumann, P.Wilkinson, A.J.Brzozowski, A.M.Verma, C.S.Zaim, J.Wysocki, S.D Bujacz, G.

(2006) J.Mol.Biol. 364: 309-322

  • DOI: 10.1016/j.jmb.2006.06.033

  • PubMed Abstract: 
  • Cbl is a member of the large family of LysR-type transcriptional regulators (LTTRs) common in bacteria and found also in Archaea and algal chloroplasts. The function of Cbl is required in Escherichia coli for expression of sulphate starvation-inducib ...

    Cbl is a member of the large family of LysR-type transcriptional regulators (LTTRs) common in bacteria and found also in Archaea and algal chloroplasts. The function of Cbl is required in Escherichia coli for expression of sulphate starvation-inducible (ssi) genes, associated with the biosynthesis of cysteine from organic sulphur sources (sulphonates). Here, we report the crystal structure of the cofactor-binding domain of Cbl (c-Cbl) from E. coli. The overall fold of c-Cbl is very similar to the regulatory domain (RD) of another LysR family member, CysB. The RD is composed of two subdomains enclosing a cavity, which is expected to bind effector molecules. We have constructed and analysed several full-length Cbl variants bearing single residue substitutions in the RD that affect cofactor responses. Using in vivo and in vitro transcription assays, we demonstrate that pssuE, a Cbl responsive promoter, is down-regulated not only by the cofactor, adenosine phosphosulphate (APS), but also by thiosulphate, and, that the same RD determinants are important for the response to both cofactors. We also demonstrate the effects of selected site-directed mutations on Cbl oligomerization and discuss these in the context of the structure. Based on the crystal structure and molecular modelling, we propose a model for the interaction of Cbl with adenosine phosphosulphate.


    Organizational Affiliation

    Faculty of Biotechnology and Food Sciences, Technical University of Lodz, Stefanowskiego 4/10, 90-924 Lodz, Poland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HTH-type transcriptional regulator cbl
A, B, C, D
228Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: cbl
Find proteins for Q47083 (Escherichia coli (strain K12))
Go to UniProtKB:  Q47083
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.184 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 169.686α = 90.00
b = 242.373β = 90.00
c = 101.626γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
SCALEPACKdata scaling
AMoREphasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-02-21
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance