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Characterization of Nitrile-hydrolyzing Enzymes Produced from Rhodococcus erythropolis  

Park Hyo-Jung (Division of Biotechnology, The Catholic University of Korea)
Park Ha-Joo (Division of Biotechnology, The Catholic University of Korea)
Uhm Ki-Nam (Equispharm, Ltd.)
Kim Hyung-Kwoun (Division of Biotechnology, The Catholic University of Korea)
Publication Information
Microbiology and Biotechnology Letters / v.34, no.3, 2006 , pp. 204-210 More about this Journal
Abstract
Ethyl (S)-4-chloro-3-hydroxybutyrate is a useful intermediate for the synthesis of Atorvastatin, a chiral drug to hypercholesterolemia. In this research, two 4-chloro-3-hydroxybutyro-nitrile-degrading strains were isolated from soil sample. They were identified as Rhodococcus erythropolis strains by 16S rRNA analysis. The nitrile-degrading enzyme(s) were suggested to be nitrile hydratase and amidase rather than nitrilase from the result of thin layer chromatography analysis. The corresponding genes were obtained by PCR cloning method. The predicted protein sequences had identities more than 96% with nitrile hydratase ${\alpha}-subunit$, nitrile hydratase ${\beta}-subunit$, and amidase of R. erythropolis. The 4-chloro-3-hydroxybutyronitrile-hydrolyzing activities in both strains were increased dramatically by ${\varepsilon}-caprolactam$ which was known as good inducer for nitrile hydratase. Both intact cells and cell-free extract could hydrolyze the nitrile compound. So, the intact cell and the enzymes could be used as potential biocatalyst for the production of 4-chloro-3-hydroxybutyric acid.
Keywords
Nitrile hydratase; amidase; Rhodococcus erythropolis; 4-chloro-3-hydroxy butyronitrile;
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