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The P-loop NTPase RUVBL2 is a conserved clock component across eukaryotes.

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The eukaryotic circadian clock utilizes the RUVBL2 enzyme, which has remarkably slow ATPase activity. This finding reveals RUVBL2 as a conserved component across species, suggesting slow ATP hydrolysis is a shared feature of biological clocks.

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Area of Science:

  • Chronobiology
  • Molecular Biology
  • Biochemistry

Background:

  • Eukaryotic circadian clocks share conserved architecture but lack common molecular ancestry.
  • The RUVBL2 enzyme is known to influence circadian phase and amplitude in mammalian clocks.

Purpose of the Study:

  • To investigate the role of RUVBL2 in the eukaryotic circadian clock.
  • To determine the mechanism by which RUVBL2 influences circadian rhythms.

Main Methods:

  • Screening of RUVBL2 variants for effects on circadian locomotor activity rhythms in mice.
  • Enzymatic assays to measure the ATPase activity of wild-type RUVBL2.
  • Analysis of physical interactions between RUVBL2 orthologues and core clock proteins across species.

Main Results:

  • RUVBL2 influences the circadian period through its exceptionally slow ATPase activity (hydrolyzing ~13 ATP molecules/day).
  • Mutants of RUVBL2 exhibited altered circadian rhythms, including arrhythmic, short-period, and long-period phenotypes.
  • RUVBL2 orthologues interact with core clock proteins in humans, Drosophila, and Neurospora, showing conserved clock function.

Conclusions:

  • RUVBL2 is established as a common core component of eukaryotic circadian clocks.
  • Slow ATPase activity, previously observed in cyanobacteria, is a shared feature of eukaryotic clocks.
  • The findings suggest a conserved mechanism for timekeeping across diverse life forms.