5DBK

apo form of the quorum sensor NprR from B. thuringiensis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.241 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.211 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

How Quorum Sensing Connects Sporulation to Necrotrophism in Bacillus thuringiensis.

Perchat, S.Talagas, A.Poncet, S.Lazar, N.Li de la Sierra-Gallay, I.Gohar, M.Lereclus, D.Nessler, S.

(2016) Plos Pathog. 12: e1005779-e1005779

  • DOI: 10.1371/journal.ppat.1005779

  • PubMed Abstract: 
  • Bacteria use quorum sensing to coordinate adaptation properties, cell fate or commitment to sporulation. The infectious cycle of Bacillus thuringiensis in the insect host is a powerful model to investigate the role of quorum sensing in natural condit ...

    Bacteria use quorum sensing to coordinate adaptation properties, cell fate or commitment to sporulation. The infectious cycle of Bacillus thuringiensis in the insect host is a powerful model to investigate the role of quorum sensing in natural conditions. It is tuned by communication systems regulators belonging to the RNPP family and directly regulated by re-internalized signaling peptides. One such RNPP regulator, NprR, acts in the presence of its cognate signaling peptide NprX as a transcription factor, regulating a set of genes involved in the survival of these bacteria in the insect cadaver. Here, we demonstrate that, in the absence of NprX and independently of its transcriptional activator function, NprR negatively controls sporulation. NprR inhibits expression of Spo0A-regulated genes by preventing the KinA-dependent phosphorylation of the phosphotransferase Spo0F, thus delaying initiation of the sporulation process. This NprR function displays striking similarities with the Rap proteins, which also belong to the RNPP family, but are devoid of DNA-binding domain and indirectly control gene expression via protein-protein interactions in Bacilli. Conservation of the Rap residues directly interacting with Spo0F further suggests a common inhibition of the sporulation phosphorelay. The crystal structure of apo NprR confirms that NprR displays a highly flexible Rap-like structure. We propose a molecular regulatory mechanism in which key residues of the bifunctional regulator NprR are directly and alternatively involved in its two functions. NprX binding switches NprR from a dimeric inhibitor of sporulation to a tetrameric transcriptional activator involved in the necrotrophic lifestyle of B. thuringiensis. NprR thus tightly coordinates sporulation and necrotrophism, ensuring survival and dissemination of the bacteria during host infection.


    Organizational Affiliation

    Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, Jouy-en-Josas, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transcriptional regulator/TPR domain protein
A, B
372Bacillus thuringiensis serovar thuringiensis str. IS5056Mutation(s): 2 
Find proteins for M1Q3P9 (Bacillus thuringiensis serovar thuringiensis str. IS5056)
Go to UniProtKB:  M1Q3P9
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.241 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.211 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 67.789α = 90.00
b = 105.337β = 90.00
c = 177.068γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHASERphasing
XSCALEdata scaling
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
French National Research AgencyFranceNT09_443605

Revision History 

  • Version 1.0: 2016-07-13
    Type: Initial release
  • Version 1.1: 2016-08-10
    Type: Database references
  • Version 1.2: 2017-08-30
    Type: Author supporting evidence