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Updated: Jun 26, 2025
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In Vitro Polymerization of F-actin on Early Endosomes
Published on: August 28, 2017
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Microtubule dependent sorting of actin-binding proteins in mitosis
Jana Prassler1, Mary Ecke1, Günther Gerisch2
1Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152, Martinsried, Germany.
Scientific Reports
|May 16, 2024
Summary
Formin B and Arp2/3 complex localize to microtubule asters during Dictyostelium discoideum cell division. These regions, devoid of myosin II and cortexillin, guide the path of cleavage furrows.
Area of Science:
- Cell Biology
- Cytoskeletal Dynamics
- Molecular Motors
Background:
- Understanding the spatial organization of the cytoskeleton during cell division is crucial for cell viability.
- Dictyostelium discoideum serves as a model organism for studying cytokinesis due to its unique cellular behaviors.
Purpose of the Study:
- To investigate the localization patterns of Formin B and the Arp2/3 complex during mitosis in a multinucleate Dictyostelium discoideum mutant.
- To elucidate the role of these proteins in guiding cleavage furrow ingression during cytokinesis.
Main Methods:
- Microscopy techniques to observe protein localization in live Dictyostelium discoideum cells.
- Analysis of protein distribution patterns in relation to microtubule asters and cleavage furrows.
Main Results:
- Formin B and Arp2/3 complex localized to microtubule asters during anaphase.
- Formin B formed distinct, uniformly covered areas around centrosomes, depleted of myosin II and cortexillin.
- Cleavage furrows were observed to avoid these Formin B-enriched regions.
Conclusions:
- Formin B and Arp2/3 complex play a role in organizing the cellular landscape during cytokinesis.
- The observed localization patterns suggest a mechanism for guiding cleavage furrow progression by excluding specific proteins from certain cellular domains.
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