4O2H

Crystal structure of BCAM1869 protein (RsaM homolog) from Burkholderia cenocepacia


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.215 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

RsaM: a transcriptional regulator of Burkholderia spp. with novel fold.

Michalska, K.Chhor, G.Clancy, S.Jedrzejczak, R.Babnigg, G.Winans, S.C.Joachimiak, A.

(2014) Febs J. 281: 4293-4306

  • DOI: 10.1111/febs.12868

  • PubMed Abstract: 
  • Burkholderia cepacia complex is a set of closely related bacterial species that are notorious pathogens of cystic fibrosis patients, responsible for life-threatening lung infections. Expression of several virulence factors of Burkholderia cepacia com ...

    Burkholderia cepacia complex is a set of closely related bacterial species that are notorious pathogens of cystic fibrosis patients, responsible for life-threatening lung infections. Expression of several virulence factors of Burkholderia cepacia complex is controlled by a mechanism known as quorum sensing (QS). QS is a means of bacterial communication used to coordinate gene expression in a cell-density-dependent manner. The system involves the production of diffusible signaling molecules (N-acyl-l-homoserine lactones, AHLs), that bind to cognate transcriptional regulators and influence their ability to regulate gene expression. One such system that is highly conserved in Burkholderia cepacia complex consists of CepI and CepR. CepI is AHL synthase, whereas CepR is an AHL-dependent transcription factor. In most members of the Burkholderia cepacia complex group, the cepI and cepR genes are divergently transcribed and separated by additional genes. One of them, bcam1869, encodes the BcRsaM protein, which was recently postulated to modulate the abundance or activity of CepI or CepR. Here, we show the crystal structure of BcRsaM from B. cenocepacia J2315. It is a single-domain protein with unique topology and presents a novel fold. The protein is a dimer in the crystal and in solution. This regulator has no known DNA-binding motifs and direct binding of BcRsaM to the cepI promoter could not be detected in in vitro assays. Therefore, we propose that the modulatory action of RsaM might result from interactions with other components of the QS machinery rather than from direct association with the DNA promoter.


    Organizational Affiliation

    Midwest Center for Structural Genomics, Argonne National Laboratory, IL, USA; Structural Biology Center, Biosciences Division, Argonne National Laboratory, IL, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
protein BCAM1869
A, B
150Burkholderia cenocepacia (strain ATCC BAA-245 / DSM 16553 / LMG 16656 / NCTC 13227 / J2315 / CF5610)Mutation(s): 0 
Find proteins for B4EMD1 (Burkholderia cenocepacia (strain ATCC BAA-245 / DSM 16553 / LMG 16656 / NCTC 13227 / J2315 / CF5610))
Go to UniProtKB:  B4EMD1
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.215 
  • Space Group: P 61 2 2
Unit Cell:
Length (Å)Angle (°)
a = 69.146α = 90.00
b = 69.146β = 90.00
c = 216.772γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
SBC-Collectdata collection
BUSTERrefinement
HKL-3000data reduction
HKL-3000data scaling
SHARPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-01-22
    Type: Initial release
  • Version 1.1: 2014-07-02
    Type: Database references
  • Version 1.2: 2014-10-01
    Type: Database references