1lzk: Difference between revisions

Revision as of 22:53, 2 July 2008

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File:1lzk.png

Template:STRUCTURE 1lzk

BACTERIAL HEROIN ESTERASE COMPLEX WITH TRANSITION STATE ANALOG DIMETHYLARSENIC ACIDBACTERIAL HEROIN ESTERASE COMPLEX WITH TRANSITION STATE ANALOG DIMETHYLARSENIC ACID

Template:ABSTRACT PUBMED 12421810

About this StructureAbout this Structure

1LZK is a Single protein structure of sequence from Rhodococcus sp.. Full crystallographic information is available from OCA.

ReferenceReference

Observation of an arsenic adduct in an acetyl esterase crystal structure., Zhu X, Larsen NA, Basran A, Bruce NC, Wilson IA, J Biol Chem. 2003 Jan 17;278(3):2008-14. Epub 2002 Nov 5. PMID:12421810

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-'''BACTERIAL HEROIN ESTERASE COMPLEX WITH TRANSITION STATE ANALOG DIMETHYLARSENIC ACID'''
+===BACTERIAL HEROIN ESTERASE COMPLEX WITH TRANSITION STATE ANALOG DIMETHYLARSENIC ACID===
-==Overview==
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-The crystal structures of an acetyl esterase, HerE, and its complex with an inhibitor dimethylarsinic acid have been determined at 1.30- and 1.45-A resolution, respectively. Although the natural substrate for the enzyme is unknown, HerE hydrolyzes the acetyl groups from heroin to yield morphine and from phenyl acetate to yield phenol. Recently, the activity of the enzyme toward heroin has been exploited to develop a heroin biosensor, which affords higher sensitivity than other currently available detection methods. The crystal structure reveals a single domain with the canonical alpha/beta hydrolase fold with an acyl binding pocket that snugly accommodates the acetyl substituent of the substrate and three backbone amides that form a tripartite oxyanion hole. In addition, a covalent adduct was observed between the active site serine and dimethylarsinic acid, which inhibits the enzyme. This crystal structure provides the first example of an As-containing compound in a serine esterase active site and the first example of covalent modification of serine by arsenic. Thus, the HerE complex reveals the structural basis for the broad scope inhibition of serine hydrolases by As(V)-containing organic compounds.
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