6MVN

LasR LBD L130F:3OC10HSL complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.179 

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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Structural determinants driving homoserine lactone ligand selection in thePseudomonas aeruginosaLasR quorum-sensing receptor.

McCready, A.R.Paczkowski, J.E.Henke, B.R.Bassler, B.L.

(2019) Proc Natl Acad Sci U S A 116: 245-254

  • DOI: 10.1073/pnas.1817239116
  • Primary Citation of Related Structures:  
    6MVN

  • PubMed Abstract: 
  • Quorum sensing is a cell-cell communication process that bacteria use to orchestrate group behaviors. Quorum sensing is mediated by signal molecules called autoinducers. Autoinducers are often structurally similar, raising questions concerning how bacteria distinguish among them ...

    Quorum sensing is a cell-cell communication process that bacteria use to orchestrate group behaviors. Quorum sensing is mediated by signal molecules called autoinducers. Autoinducers are often structurally similar, raising questions concerning how bacteria distinguish among them. Here, we use the Pseudomonas aeruginosa LasR quorum-sensing receptor to explore signal discrimination. The cognate autoinducer, 3OC 12 homoserine lactone (3OC 12 HSL), is a more potent activator of LasR than other homoserine lactones. However, other homoserine lactones can elicit LasR-dependent quorum-sensing responses, showing that LasR displays ligand promiscuity. We identify mutants that alter which homoserine lactones LasR detects. Substitution at residue S129 decreases the LasR response to 3OC 12 HSL, while enhancing discrimination against noncognate autoinducers. Conversely, the LasR L130F mutation increases the potency of 3OC 12 HSL and other homoserine lactones. We solve crystal structures of LasR ligand-binding domains complexed with noncognate autoinducers. Comparison with existing structures reveals that ligand selectivity/sensitivity is mediated by a flexible loop near the ligand-binding site. We show that LasR variants with modified ligand preferences exhibit altered quorum-sensing responses to autoinducers in vivo. We suggest that possessing some ligand promiscuity endows LasR with the ability to optimally regulate quorum-sensing traits.


    Organizational Affiliation

    Howard Hughes Medical Institute, Chevy Chase, MD 20815.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Transcriptional regulator LasRA, B239Pseudomonas aeruginosa UCBPP-PA14Mutation(s): 1 
Gene Names: lasRPA14_45960
UniProt
Find proteins for A0A0H2Z901 (Pseudomonas aeruginosa (strain UCBPP-PA14))
Explore A0A0H2Z901 
Go to UniProtKB:  A0A0H2Z901
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
3M5 (Subject of Investigation/LOI)
Query on 3M5

Download Ideal Coordinates CCD File 
C [auth A], D [auth B]3-oxo-N-[(3S)-2-oxotetrahydrofuran-3-yl]decanamide
C14 H23 N O4
KYGIKEQVUKTKRR-LBPRGKRZSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
3M5 BindingDB:  6MVN EC50: 15 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.179 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.664α = 90
b = 62.124β = 90.21
c = 51.315γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data reduction
HKL-3000data scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment  



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States5R37GM065859
National Science Foundation (NSF, United States)United StatesMCB-1713731
Howard Hughes Medical Institute (HHMI)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-16
    Type: Initial release
  • Version 1.1: 2019-11-20
    Changes: Author supporting evidence