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Regulation of Clock and NPAS2 DNA Binding by the Redox State of NAD Cofactors

Science  20 Jul 2001:
Vol. 293, Issue 5529, pp. 510-514
DOI: 10.1126/science.1060698

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Abstract

Clock:BMAL1 and NPAS2:BMAL1 are heterodimeric transcription factors that control gene expression as a function of the light-dark cycle. Although built to fluctuate at or near a 24-hour cycle, the clock can be entrained by light, activity, or food. Here we show that the DNA-binding activity of the Clock:BMAL1 and NPAS2:BMAL1 heterodimers is regulated by the redox state of nicotinamide adenine dinucleotide (NAD) cofactors in a purified system. The reduced forms of the redox cofactors, NAD(H) and NADP(H), strongly enhance DNA binding of the Clock:BMAL1 and NPAS2:BMAL1 heterodimers, whereas the oxidized forms inhibit. These observations raise the possibility that food, neuronal activity, or both may entrain the circadian clock by direct modulation of cellular redox state.

  • * These authors contributed equally to this work.

  • To whom correspondence should be addressed. E-mail: smckni{at}biochem.swmed.edu

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