3U3W

Crystal Structure of Bacillus thuringiensis PlcR in complex with the peptide PapR7 and DNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.179 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis for the activation mechanism of the PlcR virulence regulator by the quorum-sensing signal peptide PapR.

Grenha, R.Slamti, L.Nicaise, M.Refes, Y.Lereclus, D.Nessler, S.

(2013) Proc.Natl.Acad.Sci.USA 110: 1047-1052

  • DOI: 10.1073/pnas.1213770110
  • Primary Citation of Related Structures:  4FSC

  • PubMed Abstract: 
  • The quorum-sensing regulator PlcR is the master regulator of most known virulence factors in Bacillus cereus. It is a helix-turn-helix (HTH)-type transcription factor activated upon binding of its cognate signaling peptide PapR on a tetratricopeptide ...

    The quorum-sensing regulator PlcR is the master regulator of most known virulence factors in Bacillus cereus. It is a helix-turn-helix (HTH)-type transcription factor activated upon binding of its cognate signaling peptide PapR on a tetratricopeptide repeat-type regulatory domain. The structural and functional properties of PlcR have defined a new family of sensor regulators, called the RNPP family (for Rap, NprR, PrgX, and PlcR), in Gram-positive bacteria. To fully understand the activation mechanism of PlcR, we took a closer look at the conformation changes induced upon binding of PapR and of its target DNA, known as PlcR-box. For that purpose we have determined the structures of the apoform of PlcR (Apo PlcR) and of the ternary complex of PlcR with PapR and the PlcR-box from the plcA promoter. Comparison of the apoform of PlcR with the previously published structure of the PlcR-PapR binary complex shows how a small conformational change induced in the C-terminal region of the tetratricopeptide repeat (TPR) domain upon peptide binding propagates via the linker helix to the N-terminal HTH DNA-binding domain. Further comparison with the PlcR-PapR-DNA ternary complex shows how the activation of the PlcR dimer allows the linker helix to undergo a drastic conformational change and subsequent proper positioning of the HTH domains in the major groove of the two half sites of the pseudopalindromic PlcR-box. Together with random mutagenesis experiments and interaction measurements using peptides from distinct pherogroups, this structural analysis allows us to propose a molecular mechanism for this functional switch.


    Organizational Affiliation

    Laboratoire d'Enzymologie et Biochimie Structurales, Unité Propre de Recherche 3082, Centre National de la Recherche Scientifique, 91198 Gif sur Yvette, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transcriptional activator PlcR protein
A, B
293Bacillus thuringiensisGene Names: plcR
Find proteins for Q45782 (Bacillus thuringiensis)
Go to UniProtKB:  Q45782
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
C-terminus heptapeptide from PapR protein
P, Q
7Bacillus cereus (strain G9842)Gene Names: papR
Find proteins for B7IR02 (Bacillus cereus (strain G9842))
Go to UniProtKB:  B7IR02
Entity ID: 3
MoleculeChainsLengthOrganism
5'-D(P*CP*TP*AP*TP*GP*CP*AP*AP*TP*AP*TP*TP*TP*CP*AP*TP*AP*T)-3'Y18N/A
Entity ID: 4
MoleculeChainsLengthOrganism
5'-D(P*AP*TP*AP*TP*GP*AP*AP*AP*TP*AP*TP*TP*GP*CP*AP*TP*AP*G)-3'Z18N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.179 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 88.880α = 90.00
b = 71.088β = 115.53
c = 88.853γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
XDSdata reduction
MxCuBEdata collection
PHENIXrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-01-09
    Type: Initial release
  • Version 1.1: 2013-03-13
    Type: Database references