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Science 29 November 2002:
Vol. 298. no. 5599, pp. 1793 - 1796
DOI: 10.1126/science.1076535
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Reports

Structural Adaptations in a Membrane Enzyme That Terminates Endocannabinoid Signaling

Michael H. Bracey,1* Michael A. Hanson,2* Kim R. Masuda,1 Raymond C. Stevens,23dagger Benjamin F. Cravatt124dagger

Cellular communication in the nervous system is mediated by chemical messengers that include amino acids, monoamines, peptide hormones, and lipids. An interesting question is how neurons regulate signals that are transmitted by membrane-embedded lipids. Here, we report the 2.8 angstrom crystal structure of the integral membrane protein fatty acid amide hydrolase (FAAH), an enzyme that degrades members of the endocannabinoid class of signaling lipids and terminates their activity. The structure of FAAH complexed with an arachidonyl inhibitor reveals how a set of discrete structural alterations allows this enzyme, in contrast to soluble hydrolases of the same family, to integrate into cell membranes and establish direct access to the bilayer from its active site.

Departments of 1 Cell Biology, 2 Chemistry, and 3 Molecular Biology, 4 Skaggs Institute for Chemical Biology, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
*   These authors contributed equally to this work.

dagger    To whom correspondence should be addressed. E-mail: cravatt{at}scripps.edu, stevens{at}scripps.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)