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Biochemistry (Mosc). 2005 Nov;70(11):1280-7.

Aliphatic amidase from Rhodococcus rhodochrous M8 is related to the nitrilase/cyanide hydratase family.

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Faculty of Bioengineering and Bioinformatics, Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119992, Russia.


A comparative study of amino acid sequence and physicochemical properties indicates the affiliation of an amidase from Rhodococcus rhodochrous M8 (EC to the nitrilase/cyanide hydratase family. Cluster analysis and multiple alignments show that Cys166 is an active site nucleophile. The enzyme has been shown to be a typical aliphatic amidase, being the most active toward short-chain linear amides. Small polar molecules such as hydroxylamine and O-methyl hydroxylamine can serve as effective external nucleophiles in acyl transfer reactions. The kinetics of the industrially important amidase-catalyzed acrylamide hydrolysis has been studied over a wide range of substrate concentrations; inhibition during enzymatic hydrolysis by the substrate and product (acrylic acid) has been observed; an adequate kinetic scheme has been evaluated and the corresponding kinetic parameters have been determined.

[Indexed for MEDLINE]

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