Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 69.99 kDa 
• Atom Count: 4452 
• Residue Count: 593 
• Unique protein chains: 1

4GO1

Crystal Structure of full length transcription repressor LsrR from E. coli.

• DOI: 10.2210/pdb4GO1/pdb

• Classification: TRANSCRIPTION
• Organism(s): Escherichia coli K-12
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2012-08-17 Released: 2013-04-24 
• Deposition Author(s): Wu, M., Tao, Y., Liu, X., Zang, J.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.268 
• R-Value Work: 0.216 
• R-Value Observed: 0.220 

Literature

Structural Basis for Phosphorylated Autoinducer-2 Modulation of the Oligomerization State of the Global Transcription Regulator LsrR from Escherichia coli

Wu, M., Tao, Y., Liu, X., Zang, J.

(2013) J Biol Chem 288: 15878-15887

• PubMed: 23589368 
• DOI: 10.1074/jbc.M112.417634
• Structures With Same Primary Citation


• PubMed Abstract: 
  

Quorum-sensing systems are widely used by bacteria to control behavior in response to fluctuations in cell density. Several small diffusible molecules called autoinducers act as signaling molecules in quorum-sensing processes through interplay with sensors. Autoinducers modulate vital physiological functions such as nutrient acquisition, gene transcription, and virulence factor production. In Escherichia coli, LsrR serves as a global transcription regulator that responds to autoinducer-2 to regulate the expression of a variety of genes, including the lsr operon and the lsrR gene. Here, we report the crystal structure of full-length LsrR from E. coli, which has an N-terminal DNA-binding domain and a C-terminal ligand-binding domain connected by a β-strand. Although only two molecules are found in one asymmetric unit, two neighboring dimers pack to form a tetramer that is consistent with the oligomerization state of LsrR in solution. Mutagenesis experiments and gel shift assays indicated that Gln-33 and Tyr-26 might be involved in interactions between LsrR and DNA. The LsrR-binding site for phosphorylated autoinducer-2 was predicted by structural comparisons of LsrR with CggR and SorC. Cross-linking, size exclusion chromatography, and gel shift assays determined that phosphorylated autoinducer-2 triggered the disassembly of the LsrR tetramer into dimers and reduced the DNA binding ability of LsrR. Our findings reveal a mechanism for the change in the oligomerization state of LsrR in the presence of phosphorylated autoinducer-2. Based on these observations, we propose that phosphorylated autoinducer-2 triggers the disassembly of the LsrR tetramer to activate the transcription of its target genes.

---

Organizational Affiliation: 

Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Transcriptional regulator LsrR	A, B	325	Escherichia coli K-12	Mutation(s): 0  Gene Names: b1512, JW1505, lsrR, ydeW
Find proteins for P76141 (Escherichia coli (strain K12)) Go to UniProtKB:  P76141

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GOL	A, B	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.268 
• R-Value Work: 0.216 
• R-Value Observed: 0.220 
• Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 79.702	α = 90
b = 113.866	β = 90
c = 185.271	γ = 90

Software Package:

Software Name	Purpose
HKL-2000	data collection
PHASER	phasing
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-08-17 
• Released Date: 2013-04-24 
Deposition Author(s): Wu, M., Tao, Y., Liu, X., Zang, J.

Revision History 

• Version 1.0: 2013-04-24
  Type: Initial release
  
• Version 1.1: 2013-06-19
  Changes: Database references