Abstract

Esterases are important enzymes because of their ability to catalyze a number of hydrolytic reactions. Cloning and overexpression of esterase genes provides a useful strategy to make further esterases available for technical use. A genomic library of Rhodococcus sp. NCIMB 11216 was screened by activity assay using α-naphthol-acetate. Two independent esterase genes were isolated and one of them showed ability to hydrolyse esters of tertiary alcohols. By rescreening the genomic library using the bulky substrate, naphthol AS-D acetate, a few further esterase genes were isolated.

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