Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

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

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 54.00 kDa 
• Atom Count: 2610 
• Residue Count: 324 
• Unique protein chains: 1

6MWW

LasR LBD:BB0126 complex

• DOI: 10.2210/pdb6MWW/pdb

• Classification: TRANSCRIPTION
• Organism(s): Pseudomonas aeruginosa UCBPP-PA14
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2018-10-30 Released: 2019-04-03 
• Deposition Author(s): Bassler, B.L., Paczkowski, J.E.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), National Science Foundation (NSF, United States), Howard Hughes Medical Institute (HHMI)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.76 Å
• R-Value Free: 0.281 
• R-Value Work: 0.204 
• R-Value Observed: 0.208 

Literature

An Autoinducer Analogue Reveals an Alternative Mode of Ligand Binding for the LasR Quorum-Sensing Receptor.

Paczkowski, J.E., McCready, A.R., Cong, J.P., Li, Z., Jeffrey, P.D., Smith, C.D., Henke, B.R., Hughson, F.M., Bassler, B.L.

(2019) ACS Chem Biol 14: 378-389

• PubMed: 30763066 
• DOI: 10.1021/acschembio.8b00971
• Primary Citation of Related Structures:  
  6MVM, 6MWZ, 6MWW, 6MWH, 6MWL


• PubMed Abstract: 
  

Bacteria use a cell-cell communication process called quorum sensing to coordinate collective behaviors. Quorum sensing relies on production and group-wide detection of extracellular signal molecules called autoinducers. Here, we probe the activity of the Pseudomonas aeruginosa LasR quorum-sensing receptor using synthetic agonists based on the structure of the native homoserine lactone autoinducer. The synthetic compounds range from low to high potency, and agonist activity tracks with the ability of the agonist to stabilize the LasR protein. Structural analyses of the LasR ligand binding domain complexed with representative synthetic agonists reveal two modes of ligand binding, one mimicking the canonical autoinducer binding arrangement, and the other with the lactone head group rotated approximately 150°. Iterative mutagenesis combined with chemical synthesis reveals the amino acid residues and the chemical moieties, respectively, that are key to enabling each mode of binding. Simultaneous alteration of LasR residues Thr75, Tyr93, and Ala127 converts low-potency compounds into high-potency compounds and converts ligands that are nearly inactive into low-potency compounds. These results show that the LasR binding pocket displays significant flexibility in accommodating different ligands. The ability of LasR to bind ligands in different conformations, and in so doing, alter their potency as agonists, could explain the difficulties that have been encountered in the development of competitive LasR inhibitors.

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Organizational Affiliation: 

Howard Hughes Medical Institute , Chevy Chase , Maryland 20815 , United States.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Transcriptional regulator LasR	A, B	239	Pseudomonas aeruginosa UCBPP-PA14	Mutation(s): 0  Gene Names: lasR, PA14_45960
Find proteins for P25084 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)) Explore P25084  Go to UniProtKB:  P25084

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
K5J	A, B	4-[3-(methylsulfonyl)phenoxy]-N-[(1R,3R,5R)-2-oxobicyclo[3.1.0]hexan-3-yl]butanamide C17 H21 N O5 S MNLBJMNPVMBTLW-KCPJHIHWSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.76 Å
• R-Value Free: 0.281 
• R-Value Work: 0.204 
• R-Value Observed: 0.208 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 50.892	α = 90
b = 63.581	β = 112.17
c = 51.797	γ = 90

Software Package:

Software Name	Purpose
BUSTER	refinement
XDS	data reduction
XDS	data scaling
PHENIX	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2018-10-30 
• Released Date: 2019-04-03 
Deposition Author(s): Bassler, B.L., Paczkowski, J.E.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	5R37GM065859
National Science Foundation (NSF, United States)	United States	MCB-1713731
Howard Hughes Medical Institute (HHMI)	United States	--

Revision History 

• Version 1.0: 2019-04-03
  Type: Initial release
  
• Version 1.1: 2019-10-09
  Changes: Data collection, Database references
• Version 1.2: 2019-11-20
  Changes: Author supporting evidence