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Anal Biochem. 2009 Feb 15;385(2):377-9. doi: 10.1016/j.ab.2008.10.033. Epub 2008 Oct 31.

Application of a coupled enzyme assay to characterize nicotinamide riboside kinases.

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  • 1Department of Molecular Biology, University of Bergen, Bergen, Norway.


The recently identified nicotinamide riboside kinases (Nrks) constitute a distinct pathway of nicotinamide adenine dinucleotide (NAD) biosynthesis. Here we present the combination of an established optical adenosine triphosphatase (ATPase) test, the pyruvate kinase/lactate dehydrogenase system, with the Nrk-catalyzed reaction to determine kinetic properties of these enzymes, in particular affinities for ATP. The assay allows variation of both nucleoside and phosphate donor substrates, thereby providing major advantages for the characterization of these enzymes. We confirm previously established kinetic parameters and identify differences in substrate selectivity between the two human Nrk isoforms. The proposed assay is inexpensive and may be applied for high-throughput screening.

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