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Temperature-Sensitive Substrate and Product Binding Underlie Temperature-Compensated Phosphorylation in the Clock.

Yuta Shinohara1, Yohei M Koyama2, Maki Ukai-Tadenuma1

  • 1Laboratory for Synthetic Biology, RIKEN Quantitative Biology Center, 1-3 Yamadaoka, Suita, Osaka 565-0871, Japan.

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Summary

Biochemical mechanisms enable temperature compensation in circadian clocks. Specific mutations in CKIδ impact circadian rhythms, revealing conserved temperature-insensitive phosphorylation pathways.

Keywords:
casein kinase 1circadian clockenzyme designenzyme mechanismsenzyme simulationphosphorylationstructural biologysynthetic biologysystem biologytemperature compensation

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Area of Science:

  • Biochemistry
  • Chronobiology
  • Molecular Biology

Background:

  • Circadian clocks exhibit remarkable temperature compensation, maintaining rhythm stability across temperatures.
  • Understanding the molecular basis of this temperature insensitivity is crucial for chronobiology.

Purpose of the Study:

  • To elucidate the biochemical mechanisms behind temperature-compensated, casein kinase I delta (CKIδ)-dependent multi-site phosphorylation in mammals.
  • To identify key residues and structural features responsible for temperature insensitivity.

Main Methods:

  • Biochemical assays to study CKIδ phosphorylation kinetics at varying temperatures.
  • Inhibitor screening and mutagenesis to identify critical amino acids in CKIδ.
  • Molecular dynamics simulations and X-ray crystallography for structural analysis.
  • Behavioral assays to assess circadian rhythmicity in vivo.

Main Results:

  • Identified lower substrate affinity and higher product affinity as mechanisms for temperature-insensitive phosphorylation.
  • Aurintricarboxylic acid (ATA) identified as a temperature-sensitive kinase activator.
  • K224D/K224E mutations in CKIδ impaired product binding and temperature compensation.
  • K224D mutation altered circadian rhythms and temperature dependency.
  • Temperature-compensated phosphorylation mechanism is conserved in yeast and can be conferred to other kinases.

Conclusions:

  • Temperature-sensitive substrate and product binding mechanisms are fundamental to temperature compensation in circadian clocks.
  • The conserved CKIδ-specific domain around K224 provides a structural basis for temperature-sensitive binding.
  • This mechanism highlights evolutionary conservation and potential for broader application in kinase regulation.