NAD+

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Background

NAD+ is a coenzyme composed of ribosylnicotinamide 5'-diphosphate coupled to adenosine 5'-phosphate by pyrophosphate linkage. It is often used as a starting point for inhibitor design, a set of 14 analogs with natural NAD+ substrate can weakly inhibit NAD glycohydrolase (NADase) activity of CD38 (2 mM < IC50 < 10 mM) [1].
NAD+, also called nicotinamide adenine dinucleotide, act as a signaling molecule and a cofactor or substrate for enzymatic activities.
NAD+ is an oxidizing agent which accepts electrons from other molecules and reduces to NADH [2]. NAD+ also plays important roles in the activity of several enzymes such as poly (ADP) – ribose polymerases and cADP – ribose synthases, it can be used by some sirtuins to participate in protein deacetylation mediation, which produce O-acetyl-ADP-ribose and nicotinamide as well as the deacetylated protein [3].
Oral NAD+ supplementation has been used to combat simple fatigue as well as such mysterious and energy-sapping disorders as chronic fatigue syndrome and fibromyalgia [4].

[1]. Division of Biophysics, et al. NAD Analogs in Aid of Chemical Biology and Medicinal Chemistry. Molecules 2019, 24(22), 4187.
[2]. Houtkooper RH1, Cantó C, Wanders R.J., et al. The secret life of NAD+: An old metabolite controlling new metabolic signaling pathways. Endocr. Rev. 2010, 31(2), 194-223.
[3]. Schwer B, Verdin E. Conserved metabolic regulatory functions of sirtuins. Cell Metab. 2008, 7, 104-112.
[4]. Kussmaul, L. and J. Hirst, The mechanism of superoxide production by NADH: ubiquinone oxidoreductase (complex I) from bovine heart mitochondria. Proc Natl Acad Sci U S A, 2006. 103(20): p. 7607-12.