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A rapid and sensitive assay for tyrosine-3-monooxygenase based upon the release of 3H2O and adsorption of [3H]-tyrosine by charcoal.

作者信息

Reinhard J F, Smith G K, Nichol C A

出版信息

Life Sci. 1986 Dec 8;39(23):2185-9. doi: 10.1016/0024-3205(86)90395-4.

DOI:10.1016/0024-3205(86)90395-4
PMID:2878337
Abstract

A rapid, simple and sensitive assay has been developed for tyrosine-3-monooxygenase, the enzyme catalyzing the rate-limiting step in catecholamine biosynthesis. The assay is based upon the release of 3H2O from 3H-[3,5]-L-tyrosine with adsorption of the isotopic substrate (and its metabolites) by an aqueous slurry of activated charcoal. This method routinely yields low blank values and is simpler than the procedure requiring the use of cation exchange columns to separate the isotopic substrate from the 3H2O formed during the hydroxylation reaction.

摘要

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