2r2d: Difference between revisions

Revision as of 16:07, 4 May 2008

Structure of a quorum-quenching lactonase (AiiB) from Agrobacterium tumefaciens

OverviewOverview

N-Acyl-l-homoserine lactone (AHL) mediated quorum-sensing regulates virulence factor production in a variety of Gram-negative bacteria. Proteins capable of degrading these autoinducers have been called "quorum-quenching" enzymes, can block many quorum-sensing dependent phenotypes, and represent potentially useful reagents for clinical, agricultural, and industrial applications. The most characterized quorum-quenching enzymes to date are the AHL lactonases, which are metalloproteins that belong to the metallo-beta-lactamase superfamily. Here, we report the cloning, heterologous expression, purification, metal content, substrate specificity, and three-dimensional structure of AiiB, an AHL lactonase from Agrobacterium tumefaciens. Much like a homologous AHL lactonase from Bacillus thuringiensis, AiiB appears to be a metal-dependent AHL lactonase with broad specificity. A phosphate dianion is bound to the dinuclear zinc site and the active-site structure suggests specific mechanistic roles for an active site tyrosine and aspartate. To our knowledge, this is the second representative structure of an AHL lactonase and the first of an AHL lactonase from a microorganism that also produces AHL autoinducers. This work should help elucidate the hydrolytic ring-opening mechanism of this family of enzymes and also facilitate the design of more effective quorum-quenching catalysts.

About this StructureAbout this Structure

2R2D is a Single protein structure of sequence from Agrobacterium tumefaciens. Full crystallographic information is available from OCA.

ReferenceReference

Structure and specificity of a quorum-quenching lactonase (AiiB) from Agrobacterium tumefaciens., Liu D, Thomas PW, Momb J, Hoang QQ, Petsko GA, Ringe D, Fast W, Biochemistry. 2007 Oct 23;46(42):11789-99. Epub 2007 Sep 28. PMID:17900178 Page seeded by OCA on Sun May 4 16:07:15 2008

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OCA

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 [[Image:2r2d.jpg|left|200px]]
- {{Structure
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+The line below this paragraph, containing "STRUCTURE_2r2d", creates the "Structure Box" on the page.
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-|GENE= attM ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=358 Agrobacterium tumefaciens])
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 '''Structure of a quorum-quenching lactonase (AiiB) from Agrobacterium tumefaciens'''
@@ Line 32: / Line 29: @@
 [[Category: Ringe, D.]]
 [[Category: Thomas, P W.]]
-[[Category: agrobacterium tumefacien]]
+[[Category: Agrobacterium tumefacien]]
-[[Category: aiib]]
+[[Category: Aiib]]
-[[Category: di-nuclear zinc center]]
+[[Category: Di-nuclear zinc center]]
-[[Category: hydrolase]]
+[[Category: Hydrolase]]
-[[Category: lactonase]]
+[[Category: Lactonase]]
-[[Category: n-acyl hompserine lactone]]
+[[Category: N-acyl hompserine lactone]]
-[[Category: phosphate]]
+[[Category: Phosphate]]
-[[Category: quorum quenching]]
+[[Category: Quorum quenching]]
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May  4 16:07:15 2008''
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 04:55:56 2008''