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Title: The metabolites NADP+ and NADPH are the targets of the circadian protein Nocturnin (Curled)

Journal Article · · Nature Communications

Nocturnin (NOCT) is a rhythmically expressed protein that regulates metabolism under the control of circadian clock. It has been proposed that NOCT deadenylates and regulates metabolic enzyme mRNAs. However, in contrast to other deadenylases, purified NOCT lacks the deadenylase activity. To identify the substrate of NOCT, we conducted a mass spectrometry screen and report that NOCT specifically and directly converts the dinucleotide NADP+ into NAD+ and NADPH into NADH. Further, we demonstrate that the Drosophila NOCT ortholog, Curled, has the same enzymatic activity. We obtained the 2.7 Å crystal structure of the human NOCT•NADPH complex, which revealed that NOCT recognizes the chemically unique ribose-phosphate backbone of the metabolite, placing the 2'-terminal phosphate productively for removal. We provide evidence for NOCT targeting to mitochondria and propose that NADP(H) regulation, which takes place at least in part in mitochondria, establishes the molecular link between circadian clock and metabolism.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Sponsoring Organization:
USDOE Office of Science (SC); National Institutes of Health (NIH); Burroughs Wellcome Foundation; The Vallee Foundation; China Scholarship Council (CSC); Cancer Research UK—Lustgarten Foundation; National Institutes of Health (NIH); National Institute of General Medical Sciences (NIGMS); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0012704
OSTI ID:
1624154
Alternate ID(s):
OSTI ID: 1688564
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 10; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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The development of Garfinkel’s ‘Trust’ argument from 1947 to 1967: Demonstrating how inequality disrupts sense and self-making journal January 2020
Spatiotemporal regulation of NADP(H) phosphatase Nocturnin and its role in oxidative stress response journal December 2019