Abstract
Nicotinamide adenine dinucleotides are critical redox-active substrates for countless catabolic and anabolic reactions. Ratios of NAD+ to NADH and NADP+ to NADPH are therefore considered key indicators of the overall intracellular redox potential and metabolic state. These ratios can be measured in bulk conditions using a highly sensitive enzyme cycling-based colorimetric assay (detection limit at or below 0.05 μM or 1 pmol) following a simple extraction procedure involving solutions of acid and base. Special considerations are necessary to avoid measurement artifacts caused by the presence of endogenous redox-active metabolites, such as phenazines made by diverse Pseudomonas species (see Chapter 25).
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Acknowledgments
S.E.K. was supported by the National Science Foundation Graduate Research Fellowship Program, and D.K.N. is a Howard Hughes Medical Institute (HHMI) Investigator. We thank the HHMI for supporting our work. N. Glasser provided constructive criticism of earlier drafts of this chapter.
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Kern, S.E., Price-Whelan, A., Newman, D.K. (2014). Extraction and Measurement of NAD(P)+ and NAD(P)H. In: Filloux, A., Ramos, JL. (eds) Pseudomonas Methods and Protocols. Methods in Molecular Biology, vol 1149. Humana, New York, NY. https://doi.org/10.1007/978-1-4939-0473-0_26
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DOI: https://doi.org/10.1007/978-1-4939-0473-0_26
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