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Related Experiment Video

Updated: Jul 19, 2026

Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter
07:42

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Published on: September 17, 2016

Light-dependent sequestration of TIMELESS by CRYPTOCHROME.

M F Ceriani1, T K Darlington, D Staknis

  • 1Department of Cell Biology and NSF Center for Biological Timing, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Science (New York, N.Y.)
|July 27, 1999
PubMed
Summary

CRYPTOCHROME (CRY) acts as a light-dependent circadian photoreceptor in Drosophila. It blocks PERIOD/TIMELESS (PER/TIM) complex function by directly interacting with core clock components, influencing their nuclear localization.

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Area of Science:

  • Chronobiology
  • Molecular Biology
  • Genetics

Background:

  • Circadian clocks regulate daily biological rhythms in most organisms.
  • These clocks rely on gene regulatory feedback loops for adaptation to light-dark cycles.
  • CRYPTOCHROME (CRY) is a known protein involved in circadian photoperception in Drosophila.

Purpose of the Study:

  • To investigate the mechanism by which CRYPTOCHROME (CRY) influences circadian clock function.
  • To determine the light-dependent interaction between CRY and core circadian clock components.
  • To elucidate CRY's role as a circadian photoreceptor.

Main Methods:

  • Yeast two-hybrid interaction assays to test protein interactions.
  • Analysis of protein complex localization within the cell.
  • Investigating the light-dependent effects on protein function.

Main Results:

  • CRYPTOCHROME (CRY) blocks PERIOD/TIMELESS (PER/TIM) heterodimeric complex function in a light-dependent manner.
  • CRY and TIM form a complex and interact directly in yeast, dependent on light.
  • Light perception by CRY leads to nuclear localization of PER/TIM and CRY complexes, uncoupling TIM degradation from function abrogation.

Conclusions:

  • CRYPTOCHROME (CRY) functions as a circadian photoreceptor by directly interacting with core circadian clock proteins.
  • This interaction is light-dependent and modulates the function and localization of PER/TIM complexes.
  • CRY's role highlights a direct link between light perception and the molecular machinery of the circadian clock.