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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Molecular and enzymatic analysis of the "aldoxime-nitrile pathway" in the glutaronitrile degrader Pseudomonas sp. K-9.

A gene cluster responsible for aldoxime metabolism in the glutaronitrile degrader Pseudomonas sp. K-9 was analyzed genetically and enzymatically. The cluster was composed of genes coding for aldoxime dehydratase (Oxd), nitrile hydratase (NHase), NHase activator, amidase, acyl-CoA ligase, and some regulatory and functionally unknown proteins, which were similar to proteins appearing in the "aldoxime-nitrile pathway" gene cluster from strains having Fe-containing NHase. A key enzyme in the cluster, OxdK, which has 32.7-90.3 % identity with known Oxds, was overexpressed in Escherichia coli cells under the control of a T7 promoter in its His(6)-tagged form, purified, and characterized. The enzyme showed similar characteristics with the known Oxds coexisting with an Fe-containing NHase in its subunit structure, substrate specificity, and effects on various compounds. The enzyme can be classified into a group of "aliphatic aldoxime dehydratase (EC 4.99.1.5)." The existence of a gene cluster of enzymes responsible for aldoxime metabolism via the aldoxime-nitrile pathway (aldoxime-->nitrile-->amide-->acid-->acyl-CoA) in Pseudomonas sp. K-9, and the fact that the proteins comprising the cluster are similar to those acting on aliphatic type substrates, evidently clarified the alkylaldoxime-degrading pathway in that strain.[1]

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