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Related Concept Videos

Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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Covalently Linked Protein Regulators02:04

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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Regulated Protein Degradation02:58

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It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
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Related Experiment Video

Updated: Apr 25, 2026

Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter
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A central role for ubiquitination within a circadian clock protein modification code.

Katarina Stojkovic1, Simon S Wing2, Nicolas Cermakian1

  • 1Douglas Mental Health University Institute, McGill University, Montréal, QC Canada.

Frontiers in Molecular Neuroscience
|August 23, 2014
PubMed
Summary

The ubiquitin pathway regulates circadian rhythms by modifying clock proteins. This post-translational modification is crucial for maintaining the daily cycle and overall health.

Keywords:
circadian clockclock genedeubiquitinasestabilityubiquitinubiquitin ligase

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Area of Science:

  • Chronobiology
  • Molecular Biology
  • Biochemistry

Background:

  • Circadian rhythms are endogenous 24-hour cycles vital for physiology.
  • Disruption of circadian rhythms is linked to various diseases, including metabolic syndrome and cancer.
  • Molecular mechanisms involve clock genes in feedback loops, regulated by post-translational modifications.

Purpose of the Study:

  • To review the role of the ubiquitin pathway in regulating circadian clocks.
  • To highlight ubiquitination as a key regulator of circadian clock mechanisms and behavior.

Main Methods:

  • Literature review of studies on the ubiquitin pathway and circadian rhythms.
  • Analysis of molecular mechanisms involving ubiquitination and deubiquitination of clock proteins.

Main Results:

  • Ubiquitination regulates the stability and function of core clock components.
  • Mutations in ubiquitin ligase genes alter circadian period length.
  • Deubiquitination also plays a role in the molecular clockwork.

Conclusions:

  • The ubiquitin pathway is a critical modulator of circadian clock function.
  • Ubiquitination acts as a key component in a protein modification code governing circadian rhythms.
  • Understanding these mechanisms offers insights into circadian disruption-related diseases.