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Crystal structure of a bacterial cocaine esterase

Larsen, N. A., Turner, J. M., Stevens, J., Rosser, S., Basran, A., Lerner, R. A., Bruce, N. A. and Wilson, I. A. (2001) Crystal structure of a bacterial cocaine esterase. Nature Structural Biology, 9 (1). pp. 17-21. ISSN 1072-8368

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Here we report the first structure of a cocaine-degrading enzyme. The bacterial esterase, cocE, hydrolyzes pharmacologically active (-)-cocaine to a nonpsychoactive metabolite with a rate faster than any other reported cocaine esterase (kcat = 7.8 s-1 and KM = 640 nM). Because of the high catalytic proficiency of cocE, it is an attractive candidate for novel protein-based therapies for cocaine overdose. The crystal structure of cocE, solved by multiple anomalous dispersion (MAD) methods, reveals that cocE is a serine esterase composed of three domains: (i) a canonical alpha/beta hydrolase fold (ii) an alpha-helical domain that caps the active site and (iii) a jelly-roll-like beta-domain that interacts extensively with the other two domains. The active site was identified within the interface of all three domains by analysis of the crystal structures of transition state analog adduct and product complexes, which were refined at 1.58 Å and 1.63 Å resolution, respectively. These structural studies suggest that substrate recognition arises partly from interactions between the benzoyl moiety of cocaine and a highly evolved specificity pocket.

Item Type: Article
Institution: The University of York
Academic Units: The University of York > Biology (York)
Depositing User: York RAE Import
Date Deposited: 16 Mar 2009 16:03
Last Modified: 16 Mar 2009 16:03
Published Version: http://dx.doi.org/10.1038/nsb742
Status: Published
Publisher: Johns Hopkins University Press
Identification Number: 10.1038/nsb742
URI: http://eprints.whiterose.ac.uk/id/eprint/7095

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