Casein Kinase 1 and Disordered Clock Proteins Form Functionally Equivalent, Phospho-based Circadian Modules in Fungi and Mammals

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2022 Feb 26

PMID 35217617

Authors

Daniela Marzoll

Fidel E Serrano

Anton Shostak

Carolin Schunke

Axel C R Diernfellner

Michael Brunner

Affiliations

Soon will be listed here.

Abstract

Circadian clocks are timing systems that rhythmically adjust physiology and metabolism to the 24-h day-night cycle. Eukaryotic circadian clocks are based on transcriptional-translational feedback loops (TTFLs). Yet TTFL-core components such as Frequency (FRQ) in and Periods (PERs) in animals are not conserved, leaving unclear how a 24-h period is measured on the molecular level. Here, we show that CK1 is sufficient to promote FRQ and mouse PER2 (mPER2) hyperphosphorylation on a circadian timescale by targeting a large number of low-affinity phosphorylation sites. Slow phosphorylation kinetics rely on site-specific recruitment of Casein Kinase 1 (CK1) and access of intrinsically disordered segments of FRQ or mPER2 to bound CK1 and on CK1 autoinhibition. Compromising CK1 activity and substrate binding affects the circadian clock in and mammalian cells, respectively. We propose that CK1 and the clock proteins FRQ and PERs form functionally equivalent, phospho-based timing modules in the core of the circadian clocks of fungi and animals.

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