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Related Experiment Videos

A cyclin associated with the CDK-activating kinase MO15

T P Mäkelä1, J P Tassan, E A Nigg

  • 1Whitehead Institute for Biomedical Research, Cambridge, Massachusetts 02142.

Nature
|September 15, 1994
PubMed
Summary

Researchers discovered a new human cyclin, cyclin H, that partners with MO15 to activate other cyclin-dependent kinases (CDKs). This finding reveals a novel mechanism for cell cycle regulation through cyclin/kinase cascades.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • The eukaryotic cell cycle is tightly regulated by cyclin-dependent kinases (CDKs).
  • CDK activation requires cyclin binding and specific phosphorylation, a process mediated by CDK-activating kinase (CAK).
  • MO15 has been identified as the catalytic subunit of CAK.

Purpose of the Study:

  • To identify novel proteins associated with MO15.
  • To investigate the role of MO15-associated proteins in kinase activity.
  • To explore potential new regulatory mechanisms in the cell cycle.

Main Methods:

  • Yeast two-hybrid screening was employed to identify MO15-interacting proteins.
  • In vivo association studies were performed to confirm interactions.

Related Experiment Videos

  • Kinase assays were conducted to assess the activity of MO15/cyclin complexes.

    • Main Results:

    • A new human cyclin, designated cyclin H, was identified as a MO15-associated protein.
    • Cyclin H was found to be a major in vivo partner of MO15.
    • The MO15/cyclin H complex demonstrated enhanced kinase activity towards Cdk2/cyclin A.

    Conclusions:

    • A cyclin/kinase complex (MO15/cyclin H) can act as a regulator of other cyclin/kinase complexes.
    • These findings suggest the existence of cyclin/kinase cascades in cellular regulation.
    • This discovery provides new insights into the intricate mechanisms governing the eukaryotic cell cycle.