1NRF

C-terminal domain of the Bacillus licheniformis BlaR penicillin-receptor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.204 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of the sensor domain of the BlaR penicillin receptor from Bacillus licheniformis.

Kerff, F.Charlier, P.Colombo, M.L.Sauvage, E.Brans, A.Frere, J.M.Joris, B.Fonze, E.

(2003) Biochemistry 42: 12835-12843

  • DOI: 10.1021/bi034976a

  • PubMed Abstract: 
  • As in several staphylococci, the synthesis of the Bacillus licheniformis 749/I beta-lactamase is an inducible phenomenon regulated by a signal-transducing membrane protein BlaR. The C-terminal domain of this multimodular protein is an extracellular d ...

    As in several staphylococci, the synthesis of the Bacillus licheniformis 749/I beta-lactamase is an inducible phenomenon regulated by a signal-transducing membrane protein BlaR. The C-terminal domain of this multimodular protein is an extracellular domain which specifically recognizes beta-lactam antibiotics. When it binds a beta-lactam, a signal is transmitted by the transmembrane region to the intracellular loops. In response, the hydrolytic activity of the BlaR large cytoplasmic L3 loop is induced, and a cascade of reactions is generated, leading to the transcription of the beta-lactamase gene. Here, we describe the crystal structure of the extracellular penicillin-receptor domain of BlaR (residues 346-601) at 2.5 A resolution in order to understand why this domain, whose folding is very similar to that of class D beta-lactamases, behaves as a highly sensitive penicillin-binding protein rather than a beta-lactamase. Two residues of the BlaR C-terminal domain, Thr452 and Thr542, modify the hydrophobic characteristic of the class D beta-lactamase active site. Both residues seem to be in part responsible for the lack of beta-lactamase activity of the BlaR protein due to the stability of the acyl-enzyme. Although further experimental data are needed to fully understand the transmembrane induction process, the comparison of the BlaR sensor domain structure with those of class D beta-lactamase complexes and penicillin-binding proteins provides interesting elements to hypothesize on possible signal transmission mechanisms.


    Related Citations: 
    • The penicillin sensory transducer, BlaR, involved in the inducibility of beta-lactamase synthesis in Bacillus licheniformis is embedded in the plasma membrane via a four-alpha-helix bundle
      Hardt, K.,Joris, B.,Lepage, S.,Brasseur, R.,Lampen, J.O.,Frere, J.M.,Fink, A.L.,Ghuysen, J.M.
      (1997) MOL.MICROBIOL. 23: 935


    Organizational Affiliation

    Institut de Physique B5, Université de Liège, B-4000 Sart Tilman, Belgium.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
REGULATORY PROTEIN BLAR1
A
262Bacillus licheniformisMutation(s): 0 
Gene Names: blaR1 (penR1)
Find proteins for P12287 (Bacillus licheniformis)
Go to UniProtKB:  P12287
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.204 
  • Space Group: P 41
Unit Cell:
Length (Å)Angle (°)
a = 45.848α = 90.00
b = 45.848β = 90.00
c = 130.198γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
CCP4data scaling
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-01-24
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance