Abstract

Over 3,000 plant species are cyanogenic. Cyanogenesis is defined as the hydroxynitrile lyase catalysed release of a cyanide group in the form of HCN and the corresponding aldehyde or ketone. When a plant is attacked, HCN released is a self defence mechanism. A special characteristic of enzymatic reactions is that all enzymatic reactions are reversible-hydroxynitrile lyases can also be used for the synthesis of enantiomerically pure cyanohydrins which are of great importance in industry. This article presents a comprehensive review of the role of hydroxynitrile lyases, both in nature and industry, and an insightful. Areas covered include: history, discovery and natural sources of the hydroxynitrile lyase. Molecular cloning for mass production of this enzyme, including detailed information about several successful recombinant hydroxynitrile lyases is also included.

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