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Related Experiment Videos

Cyclin/Cdk complexes: their involvement in cell cycle progression and mitotic division.

P C John1, M Mews, R Moore

  • 1Plant Cell Biology Group, Research School of Biological Sciences, Australian National University, Canberra, ACT 2601, Australia.

Protoplasma
|December 6, 2001
PubMed
Summary

Cyclin-dependent kinases (CDKs) regulate DNA replication and mitosis. Cyclins bind CDKs, directing them to substrates, with their changing levels controlling cell cycle progression and substrate specificity, including in plants.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Plant Biology

Background:

  • Cell cycle progression, including DNA replication and mitosis, relies on cyclin-dependent protein kinase (CDK) activity.
  • CDKs are heterodimers of catalytic and cyclin subunits, with cyclin binding determining substrate specificity.
  • Cyclin abundance, regulated by transcription and proteolysis, modulates CDK activity and substrate targeting throughout the cell cycle.

Purpose of the Study:

  • To assess the mechanisms and biological significance of cyclin protein binding to CDKs.
  • To investigate the role of cyclin/CDK complexes in cell cycle regulation across diverse organisms.
  • To examine the distribution and function of cyclins and CDKs in plant cell division, specifically in maize root tips.

Main Methods:

Related Experiment Videos

  • Analysis of substrate specificity in animal CDK enzymes (D-, A-, and B-type cyclins).
  • Extensive cyclin gene manipulations in yeasts.
  • Microscopic observation of cyclin and CDK distribution in maize root tip cells during mitosis and cytokinesis.

    • Main Results:

    • Cyclin binding extends the range of CDK substrates, influencing cell cycle regulation.
    • Overlapping functions of cyclins were identified through gene deletions, suggesting functional redundancy.
    • In maize root tips, specific cyclins (CycB1zm;2, CycA1;zm;1) and CDK1 (Cdc2a) localize to key structures like the preprophase band, chromosomes, nuclear envelope, and phragmoplast, correlating with cell cycle events.
    • Mitotic cyclins persist after anaphase in plants, a potentially unique phenomenon.

    Conclusions:

    • Cyclins spatially focus CDK activity, mediating its effects on cellular structures.
    • Changing cyclin levels are crucial for cell cycle progression, particularly in initiating DNA replication.
    • Plant cells utilize similar mechanisms for cell cycle control involving cyclins and CDKs, with unique aspects in mitotic cyclin behavior and cytokinesis.