1XKZ

Crystal structure of the acylated beta-lactam sensor domain of Blar1 from S. aureus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

X-ray crystal structure of the acylated beta-lactam sensor domain of BlaR1 from Staphylococcus aureus and the mechanism of receptor activation for signal transduction

Birck, C.Cha, J.Y.Cross, J.Schulze-Briese, C.Meroueh, S.O.Schlegel, H.B.Mobashery, S.Samama, J.-P.

(2004) J.Am.Chem.Soc. 126: 13945-13947

  • DOI: 10.1021/ja044742u

  • PubMed Abstract: 
  • Methicillin-resistant strains of Staphylococcus aureus (MRSA) are the major cause of infections worldwide. Transcription of the beta-lactamase and PBP2a resistance genes is mediated by two closely related signal-transducing integral membrane proteins ...

    Methicillin-resistant strains of Staphylococcus aureus (MRSA) are the major cause of infections worldwide. Transcription of the beta-lactamase and PBP2a resistance genes is mediated by two closely related signal-transducing integral membrane proteins, BlaR1 and MecR1, upon binding of the beta-lactam inducer to the sensor domain. Herein we report the crystal structure at 1.75 A resolution of the sensor domain of BlaR1 in complex with a cephalosporin antibiotic. Activation of the signal transducer involves acylation of serine 389 by the beta-lactam antibiotic, a process promoted by the N-carboxylated side chain of Lys392. We present evidence that, on acylation, the lysine side chain experiences a spontaneous decarboxylation that entraps the sensor in its activated state. Kinetic determinations and quantum mechanical/molecular mechanical calculations and the interaction networks in the crystal structure shed light on how this unprecedented process for activation of a receptor may be achieved and provide insights into the mechanistic features that differentiate the signal-transducing receptor from the structurally related class D beta-lactamases, enzymes of antibiotic resistance.


    Organizational Affiliation

    Département de Génomique et Biologie Structurales, IGBMC CNRS/INSERM/ULP, 1 rue Laurent Fries, BP 10142, 67404 - Illkirch CU Strasbourg, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Regulatory protein blaR1
A, B, C, D
255Staphylococcus aureusMutation(s): 0 
Gene Names: blaR1
Find proteins for P18357 (Staphylococcus aureus)
Go to UniProtKB:  P18357
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EPE
Query on EPE

Download SDF File 
Download CCD File 
B
4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID
HEPES
C8 H18 N2 O4 S
JKMHFZQWWAIEOD-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

Download SDF File 
Download CCD File 
B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CAZ
Query on CAZ

Download SDF File 
Download CCD File 
A, B, C, D
ACYLATED CEFTAZIDIME
C17 H19 N5 O7 S2
VEHPZKIFULQYFS-BZXVCXBKSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.205 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 59.205α = 90.00
b = 109.791β = 106.13
c = 91.605γ = 90.00
Software Package:
Software NamePurpose
CCP4data scaling
CNSphasing
MOSFLMdata reduction
SCALAdata scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-11-30
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance