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Nat Commun. 2019 May 30;10(1):2367. doi: 10.1038/s41467-019-10125-z.

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

Author information

1
216 Schultz Laboratory, Department of Molecular Biology, Princeton, NJ, 08544, USA.
2
285 Frick Laboratory, Department of Chemistry, Princeton, NJ, 08544, USA.
3
Lewis-Sigler Institute for Integrative Genomics, Princeton, NJ, 08544, USA.
4
285 Frick Laboratory, Department of Chemistry, Princeton, NJ, 08544, USA. joshr@princeton.edu.
5
Lewis-Sigler Institute for Integrative Genomics, Princeton, NJ, 08544, USA. joshr@princeton.edu.
6
216 Schultz Laboratory, Department of Molecular Biology, Princeton, NJ, 08544, USA. akorenny@princeton.edu.

Abstract

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.

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