A Period2 Phosphoswitch Regulates and Temperature Compensates Circadian Period

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Period (PER) protein phosphorylation is a critical regulator of circadian period, yet an integrated understanding of the role and interaction between phosphorylation sites that can both increase and decrease PER2 stability remains elusive. Here, we propose a phosphoswitch model, where two competing phosphorylation sites determine whether PER2 has a fast or slow degradation rate. This mathematical model accurately reproduces the three-stage degradation kinetics of endogenous PER2. We predict and demonstrate that the phosphoswitch is intrinsically temperature sensitive, slowing down PER2 degradation as a result of faster reactions at higher temperatures. The phosphoswitch provides a biochemical mechanism for circadian temperature compensation of circadian period. This phosphoswitch additionally explains the phenotype of Familial Advanced Sleep Phase (FASP) and CK1 epsilon(tau) genetic circadian rhythm disorders, metabolic control of PER2 stability, and how drugs that inhibit CK1 alter period. The phosphoswitch provides a general mechanism to integrate diverse stimuli to regulate circadian period.
Publisher
CELL PRESS
Issue Date
2015-10
Language
English
Article Type
Article
Citation

MOLECULAR CELL, v.60, no.1, pp.77 - 88

ISSN
1097-2765
DOI
10.1016/j.molcel.2015.08.022
URI
http://hdl.handle.net/10203/206045
Appears in Collection
MA-Journal Papers(저널논문)
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