The NAMPT (NamPRT) gene is transcribed to yield mRNA and the mRNA is translated to yield protein. As inferred from mouse, the BMAL1:CLOCK (ARNTL:CLOCK) heterodimer enhances transcription of NAMPT. As inferred from mouse, the BMAL1:CLOCK (ARNTL:CLOCK) heterodimer binds an E-box element in the promoter of the NAMPT gene and enhances transcription.
Based on studies in sheep (West et al. 2013) and rat (Brigidi et al. 2019) neurons, NPAS4 transcription factor, in cooperation with its heterodimerization partners ARNT, ARNT2, and ARNTL, binds the promoter of the circadian rhythm-controlled gene NAMPT, encoding Nicotinamide phosphoribosyltransferase.
Based on studies in sheep (West et al. 2013) and rat (Brigidi et al. 2019) neurons, NPAS4 transcription factor, in cooperation with its heterodimerization partners ARNT, ARNT2, and ARNTL, directly stimulates transcription of the circadian rythm-controlled gene NAMPT, encoding Nicotinamide phosphoribosyltransferase.
The rhythmic production of NAD+ may function to fine-tune the daily cycles of energy storage and utilization and to coordinate these processes with the rest-activity cycle (Ramsay et al. 2009).
Nicotinamide phosphoribosyltransferase (NamPRT) catalyzes the condensation of nicotinamide with 5- phosphoribosyl-1-pyrophosphate to yield nicotinamide D-ribonucleotide (NMN), an intermediate in the biosynthesis of NAD. It is the rate limiting component in the mammalian NAD biosynthesis pathway.