PMID: 16628007Apr 22, 2006Paper

Post-translational regulation of circadian transcriptional CLOCK(NPAS2)/BMAL1 complex by CRYPTOCHROMES

Cell Cycle
Roman V KondratovMarina P Antoch

Abstract

Mammalian CLOCK(NPAS2), BMAL1 and CRYPTOCHROMEs are core components of the circadian oscillatory mechanism. The active CLOCK/BMAL1 or NPAS2/BMAL1 complexes regulate expression of numerous genes including two Cryptochromes. The products of these genes, CRY1 and CRY2, in turn repress CLOCK/BMAL1 transcriptional activity by an unknown mechanism. We have examined the effect of CRYPTOCHROMEs on posttranslational modifications and intracellular distribution of endogenous and ectopically expressed CLOCK(NPAS2) and BMAL1 proteins. We found that ectopic coexpression with CRY led to stabilization and nuclear accumulation of unphosphorylated forms of the proteins, which directly correlated with the inhibition of their transcriptional activity. This effect was CRY-specific, as other known repressors of CLOCK/BMAL1 and NPAS2/ BMAL1 transcriptional activity were not able to induce similar effects. CRYs had no effect on CLOCK(NPAS2)/BMAL1 complex formation or its ability to bind DNA. Altogether, these results demonstrate that CRYs regulate the functional activity of circadian transcriptional complex at the posttranslational level. Importantly, the posttranslational modifications and intracellular distribution of CLOCK and BMAL1 proteins were ...Continue Reading

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