Mitogen-activated protein kinase phosphorylates and negatively regulates basic helix-loop-helix-PAS transcription factor BMAL1 - PubMed (original) (raw)

. 2002 Jan 4;277(1):267-71.

doi: 10.1074/jbc.M107850200. Epub 2001 Oct 30.

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• PMID: 11687575
• DOI: 10.1074/jbc.M107850200

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Mitogen-activated protein kinase phosphorylates and negatively regulates basic helix-loop-helix-PAS transcription factor BMAL1

Kamon Sanada et al. J Biol Chem. 2002.

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Abstract

In vertebrates, mitogen-activated protein kinase (MAPK) exhibits circadian activation in several clock structures and likely participates in the timekeeping mechanism of the circadian clock. Here we show that MAPK associates with a basic helix-loop-helix-PAS transcription factor BMAL1, a positive regulator for the autoregulatory feedback loop of the circadian oscillator. MAPK phosphorylates BMAL1 at multiple sites, including Ser-527, Thr-534, and Ser-599, in vitro, and BMAL1:CLOCK-induced transactivation from the E-box element is inhibited by expression of a constitutive active form of MAPK kinase in 293 cells. The inhibitory effect is reversed by coexpression of the kinase-dead mutant of MAPK or by mutation of BMAL1 at Thr-534. These results indicate that BMAL1:CLOCK-induced transcription is negatively regulated by MAPK-mediated phosphorylation of BMAL1 at Thr-534 and suggest a molecular link between circadian-activated MAPK and the clock oscillator.

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