Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.215 

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A structural genomics approach to the study of quorum sensing: crystal structures of three LuxS orthologs.

Lewis, H.A.Furlong, E.B.Laubert, B.Eroshkina, G.A.Batiyenko, Y.Adams, J.M.Bergseid, M.G.Marsh, C.D.Peat, T.S.Sanderson, W.E.Sauder, J.M.Buchanan, S.G.

(2001) Structure 9: 527-537

  • DOI: https://doi.org/10.1016/s0969-2126(01)00613-x
  • Primary Citation of Related Structures:  
    1INN, 1J6V, 1J6W, 1J6X, 1VJE

  • PubMed Abstract: 

    Quorum sensing is the mechanism by which bacteria control gene expression in response to cell density. Two major quorum-sensing systems have been identified, system 1 and system 2, each with a characteristic signaling molecule (autoinducer-1, or AI-1, in the case of system 1, and AI-2 in system 2). The luxS gene is required for the AI-2 system of quorum sensing. LuxS and AI-2 have been described in both Gram-negative and Gram-positive bacterial species and have been shown to be involved in the expression of virulence genes in several pathogens. The structure of the LuxS protein from three different bacterial species with resolutions ranging from 1.8 A to 2.4 A has been solved using an X-ray crystallographic structural genomics approach. The structure of LuxS reported here is seen to have a new alpha-beta fold. In all structures, an equivalent homodimer is observed. A metal ion identified as zinc was seen bound to a Cys-His-His triad. Methionine was found bound to the protein near the metal and at the dimer interface. These structures provide support for a hypothesis that explains the in vivo action of LuxS. Specifically, acting as a homodimer, the protein binds a methionine analog, S-ribosylhomocysteine (SRH). The zinc atom is in position to cleave the ribose ring in a step along the synthesis pathway of AI-2.

  • Organizational Affiliation

    Structural GenomiX, San Diego, CA 92121, USA. hal_lewis@stromix.com

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
175Haemophilus influenzaeMutation(s): 0 
Find proteins for P44007 (Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd))
Explore P44007 
Go to UniProtKB:  P44007
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP44007
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.215 
  • Space Group: P 42 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 129.669α = 90
b = 129.669β = 90
c = 53.77γ = 90
Software Package:
Software NamePurpose
MAR345data collection
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-06-08
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-04
    Changes: Refinement description