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Related Experiment Videos

Growth factor-regulated G1 cyclins

C J Sherr1

  • 1Howard Hughes Medical Institute, Department of Tumor Cell Biology, St. Jude Children's Research Hospital, Memphis, Tennessee.

Stem Cells (Dayton, Ohio)
|January 1, 1994
PubMed
Summary

Mammalian D-type cyclins are key regulators of the cell cycle, controlling entry into DNA synthesis. Their activity integrates growth signals and is modulated by various stimuli and inhibitors.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Mammalian D-type cyclins are crucial regulatory subunits of cyclin-dependent kinases (cdks).
  • These holoenzymes are essential and rate-limiting for cell cycle progression through the G1 phase.
  • D-type cyclins function as growth factor sensors, linking external signals to the cell cycle machinery.

Purpose of the Study:

  • To elucidate the regulatory mechanisms of D-type cyclins and their associated cdks in cell cycle control.
  • To understand how mitogenic and anti-proliferative signals influence D-type cyclin activity.
  • To explore the role of D-type cyclins in the decision-making process for DNA replication.

Main Methods:

  • Analysis of gene transcription and protein synthesis of D-type cyclins and cdks.
  • Investigation of holoenzyme assembly and post-translational modifications.
  • Study of kinase activity and substrate phosphorylation, including the retinoblastoma protein.

Main Results:

  • Mitogenic and anti-proliferative stimuli impact D-type cyclin gene transcription and protein levels.
  • Holoenzyme activity is modulated through synthesis, assembly, and post-translational modifications.
  • Negative regulators like cAMP and rapamycin induce inhibitors that block cdk activation and function.

Conclusions:

  • D-type cyclins and cdks are central to interpreting mitogenic signals for cell cycle entry.
  • Understanding these pathways provides mechanistic insight into the G1 to S phase transition.
  • This knowledge is critical for comprehending how cells commit to DNA replication.

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