A Period2 Phosphoswitch Regulates and Temperature Compensates Circadian Period.


Journal Article

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 CK1ε(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.

Full Text

Duke Authors

Cited Authors

  • Zhou, M; Kim, JK; Eng, GWL; Forger, DB; Virshup, DM

Published Date

  • October 1, 2015

Published In

Volume / Issue

  • 60 / 1

Start / End Page

  • 77 - 88

PubMed ID

  • 26431025

Pubmed Central ID

  • 26431025

Electronic International Standard Serial Number (EISSN)

  • 1097-4164

Digital Object Identifier (DOI)

  • 10.1016/j.molcel.2015.08.022


  • eng

Conference Location

  • United States