2qvb

Publication Abstract from PubMed

Haloalkane dehalogenases are enzymes well known to be important in bioremediation; the organisms from which they are produced are able to clean up toxic organohalides from polluted environments. However, besides being found in such contaminated environments, these enzymes have also been found in root or tissue-colonizing bacterial species. The haloalkane dehalogenase Rv2579 from Mycobacterium tuberculosis H37Rv has been cloned, expressed, purified and its crystal structure determined at high resolution (1.2A). In addition, the crystal structure of the enzyme has been determined in complex with the product from the reaction with 1,3-dibromopropane, i.e. 1,3-propanediol and in complex with the classical substrate of haloalkane dehalogenases, 1,2-dichloroethane. The enzyme is a two-domain protein having a catalytic domain of an alpha/beta hydrolase fold and a cap domain. The active site residues and the halide-stabilizing residues have been identified as Asp109, Glu133, His273, Asn39 and Trp110. Its overall structure is similar to those of other known haloalkane dehalogenases. Its mechanism of action involves an SN2 nucleophilic displacement.

X-ray crystal structure of Mycobacterium tuberculosis haloalkane dehalogenase Rv2579.,Mazumdar PA, Hulecki JC, Cherney MM, Garen CR, James MN Biochim Biophys Acta. 2008 Feb;1784(2):351-62. Epub 2007 Nov 13. PMID:18062934^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.