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Bacterial Organomercurial Lyase: Overproduction, Isolation, And Characterization.

T. Begley, A. Walts, C. Walsh
Published 1986 · Chemistry, Medicine

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Organomercurial lyase mediates the first of two steps in the microbial detoxification of organomercurial salts. This enzyme encoded on the plasmid R831 obtained from Escherichia coli J53-1 has been overproduced to the level of 3% of the soluble cell protein in E. coli by a construction using the T7 promoter. The enzyme has been purified to homogeneity in quantity in three steps. It is a monomer of Mr 22,400 with no detectable cofactors or metal ions. It catalyzes the protonolysis of the C-Hg bond in a wide range of organomercurial salts (primary, secondary, tertiary, alkyl, vinyl, allyl, and aryl) to the hydrocarbon and mercuric ion with turnover rates in the range of 1-240 min-1.
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