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Related Concept Videos

Separation of Sister Chromatids02:17

Separation of Sister Chromatids

At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
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The Contractile Ring02:15

The Contractile Ring

Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
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Disassembly of Intermediate Filaments

Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
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Cohesins02:20

Cohesins

Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
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Cytoskeletal Coordination in Cell Migration01:32

Cytoskeletal Coordination in Cell Migration

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Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function. 
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Spatiotemporal Analysis of Cytokinetic Events in Fission Yeast
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Dissecting protein interactions during cytokinesis.

Saman Ebrahimi1, Stephen L Gregory

  • 1Department of Pharmacology; Kyoto University Graduate School of Medicine; Kyoto, Japan.

Communicative & Integrative Biology
|June 10, 2011
PubMed
Summary

Proper cell division relies on the acto-myosin contractile ring. This study reveals new protein interactions, including Polo Kinase and RacGAP50C, crucial for contractile ring assembly and stability during cell cytokinesis.

Keywords:
FRETPavKLPRacGAP50CRhocontractile ringcytokinesispolo

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Cytokinesis, the final stage of cell division, requires the acto-myosin contractile ring for daughter cell separation.
  • The small GTPase Rho and signals from preceding mitotic events orchestrate contractile ring assembly and function.
  • Assembly involves interactions between microtubules, motor proteins, Rho activators, and downstream proteins essential for ring stability and constriction.

Purpose of the Study:

  • To investigate the complex protein interactions governing early cytokinesis.
  • To identify key molecular players involved in contractile ring formation and stability.
  • To present new findings on the direct interaction between Polo Kinase and RacGAP50C.

Main Methods:

  • Analysis of protein interactions within the contractile ring during early cytokinesis.
  • Biochemical assays to confirm direct protein-protein interactions.
  • Microscopy and cell imaging to visualize protein localization and complex formation.

Main Results:

  • A complex network of protein interactions is revealed during early cytokinesis.
  • Direct interaction between Polo Kinase and RacGAP50C is demonstrated.
  • Unpublished data suggests additional significant interactions within the contractile ring.

Conclusions:

  • The findings elucidate critical protein interactions essential for proper contractile ring assembly and function.
  • Understanding these interactions provides insights into the regulation of cell division.
  • Further research into these interactions can reveal novel targets for therapeutic intervention in cell cycle regulation.