Role of the cell protein recycling system in daily biological clocks and sleep regulation from studies in fruit flies

The circadian clock in Drosophila is regulated by post-translational modifications and degradation of core clock proteins through the ubiquitin-proteasome system.

• Circadian rhythms are well understood at the molecular level in Drosophila.
• Post-translational modifications play a key role in regulating core clock proteins.
• The ubiquitin-proteasome system is involved in the degradation of these proteins.
• Proteasome-mediated degradation may influence both circadian clock regulation and sleep amount.
• E3 ubiquitin ligases could interact with mechanisms regulating circadian and homeostatic sleep.

Simplified