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Cell cycle: on-time delivery of Plk1 during cytokinesis

Michael Rape1

  • 1Department of Molecular and Cell Biology, Division of Cell and Developmental Biology, University of California at Berkeley, Berkeley, CA 94720-3202, USA. mrape@calmail.berkeley.edu

Current Biology : CB
|July 6, 2007
PubMed

Insights

Protein regulator of cytokinesis 1 (PRC1) delivers the kinase Plk1 to the spindle midzone during cell division. Its activity is regulated by opposing phosphorylation events, ensuring proper cytokinesis orchestration.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Plk1 is a key kinase regulating cell division, localizing to the spindle midzone during anaphase to control cytokinesis.
  • The precise mechanisms controlling Plk1 localization and activity at the spindle midzone are not fully understood.

Purpose of the Study:

  • To identify factors responsible for Plk1 delivery to the spindle midzone.
  • To elucidate the regulatory mechanisms governing the function of these Plk1-associated factors.

Main Methods:

  • Immunofluorescence microscopy to visualize protein localization.
  • Biochemical assays to study protein-protein interactions and phosphorylation.
  • Cell-based assays to assess the role of identified factors in cytokinesis.

Main Results:

  • Protein regulator of cytokinesis 1 (PRC1) was identified as a crucial factor for Plk1 localization to the spindle midzone.
  • PRC1's interaction with Plk1 and its localization are tightly regulated by phosphorylation.
  • Opposing phosphorylation by cyclin B-Cdk1 and Plk1 itself controls PRC1 function.

Conclusions:

  • PRC1 acts as a Plk1-delivery factor, essential for orchestrating cytokinesis.
  • A dynamic phosphorylation switch involving cyclin B-Cdk1 and Plk1 regulates PRC1 activity and Plk1 localization.
  • This regulatory mechanism ensures accurate execution of cell division.

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