1JVI image
Deposition Date 2001-08-30
Release Date 2001-10-24
Last Version Date 2024-04-03
Entry Detail
PDB ID:
1JVI
Title:
THE 2.2 ANGSTROM RESOLUTION STRUCTURE OF BACILLUS SUBTILIS LUXS/RIBOSILHOMOCYSTEINE COMPLEX
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.20 Å
R-Value Free:
0.24
R-Value Work:
0.17
Space Group:
P 65 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Autoinducer-2 production protein luxS
Gene (Uniprot):luxS
Mutations:P96T
Chain IDs:A
Chain Length:157
Number of Molecules:1
Biological Source:Bacillus subtilis
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
OCS A CYS CYSTEINESULFONIC ACID
Primary Citation

Abstact

In bacteria, the regulation of gene expression in response to changes in cell density is called quorum sensing. The autoinducer-2 production protein LuxS, is involved in a novel quorum-sensing system and is thought to catalyse the degradation of S-ribosylhomocysteine to homocysteine and the autoinducer molecule 4,5-dihydroxy-2,3-pentadione. The crystal structure of Bacillus subtilis LuxS has been determined at 1.2 A resolution, together with the binary complexes of LuxS with S-ribosylhomocysteine and homocysteine to 2.2 and 2.3 A resolution, respectively. These structures show that LuxS is a homodimer with an apparently novel fold based on an eight-stranded beta-barrel, flanked by six alpha-helices. Each active site contains a zinc ion coordinated by the conserved residues His54, His58 and Cys126, and includes residues from both subunits. S-ribosylhomocysteine binds in a deep pocket with the ribose moiety adjacent to the enzyme-bound zinc ion. Access to the active site appears to be restricted and possibly requires conformational changes in the protein involving the movement of residues 125-129 and those at the N terminus. The structure contains an oxidised cysteine residue in the active site whose role in the biological process of LuxS has not been determined. The autoinducer-2 signalling pathway has been linked to aspects of bacterial virulence and pathogenicity. The structural data on LuxS will provide opportunities for targeting this enzyme for the rational design of new antibiotics.

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Primary Citation of related structures