期刊
MOLECULAR CELL
卷 34, 期 3, 页码 354-363出版社
CELL PRESS
DOI: 10.1016/j.molcel.2009.04.023
关键词
-
资金
- NIGMS [T32GM008704, P20 RR018787, RO1s GM34985, RO1s GM08336, P01 GM068087]
Circadian systems are comprised of multiple proteins functioning together to produce feedback loops driving robust, approximately 24 hr rhythms. In all circadian systems, proteins in these loops are regulated through myriad physically and temporally distinct pottranslational modifications (PTMs) To better understand how PTMs impact a circadian oscillator, we implemented a proteomics-based approach by combining purification of endogenous FREQUENCY (FRQ) and its interacting partners with quantitative mass spectrometry (MS). We identify and quantify time-of-day-specific protein-protein interactions in the clock and show how these provide a platform for temporal and physical separation between the dual roles of FRQ. Additionally, by unambiguously identifying over 75 phosphorylated residues, following their quantitative change over a circadian cycle, and examining the phenotypes of strains that have lost these sites, we demonstrate how spatially and temporally regulated phosphorylation has opposing effects directly on overt circadian rhythms and FRQ stability.
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