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Journal of Biomolecular Screening
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Article

Utilization of Substrate-Induced Quenching for Screening Targets Promoting NADH and NADPH Consumption

María Jesús Vázquez1, Stephen Ashman2, Fernando Ramón3, David Calvo1, Ana Bardera3, J. Julio Martín3, Martin Rüdiger2, David Tew2, Juan Manuel Domínguez1*

1 Assay Development, GlaxoSmithKline, Madrid, Spain.
2 Assay Development, GlaxoSmithKline, Essex, United Kingdom.
3 Screening and Compound Profiling, GlaxoSmithKline, Madrid, Spain.

* To whom correspondence should be addressed. E-mail: juan.m.dominguez{at}gsk.com.


  Abstract

Oxidation of reduced nicotinamide adenine dinucleotides is a common event for many biochemical reactions. However, its exploitation for ultrahigh-throughput screening purposes is not an easy task and is affected by various drawbacks. It is known that such nucleotides induce quenching on the fluorescence of several dyes and that this quenching disappears with oxidation of the nucleotide. We have made use of this property to develop an assay for high-throughput screening with NADH- and NADPH-dependent reductases. Full screening campaigns have been run with excellent assay quality parameters, and interesting hits have been identified. The method is amenable to miniaturization and allows easy identification of false positives without needing extra secondary assays. Although it is based on monitoring substrate consumption, it is demonstrated that the effect of fractional conversion on assay sensitivity is negligible.

Key Words: substrate-induced quenching, high-throughput screening, NADH, NADPH, dehydrogenase, quenching

First published on December 16, 2005, doi:10.1177/1087057105283296

Journal of Biomolecular Screening 2006;11:75.

A more recent version of this article appeared on February 1, 2006

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