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Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
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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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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
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The yeast actin cytoskeleton.

Mithilesh Mishra1, Junqi Huang, Mohan K Balasubramanian

  • 1Temasek Life Sciences Laboratory, National University of Singapore, Singapore.

FEMS Microbiology Reviews
|January 29, 2014
PubMed
Summary
This summary is machine-generated.

The actin cytoskeleton, crucial for cell functions, is regulated by accessory proteins. Yeast models like Saccharomyces cerevisiae and Schizosaccharomyces pombe reveal universal mechanisms of actin dynamics in eukaryotes.

Keywords:
actincytokinesiscytoskeletonendocytosispolarityyeast

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Genetics

Background:

  • The actin cytoskeleton is a dynamic polymer network essential for cellular processes like migration, division, and trafficking.
  • Over 100 conserved accessory proteins regulate actin filament assembly and disassembly.
  • Studies in diverse organisms and in vitro have advanced understanding of actin dynamics.

Purpose of the Study:

  • To review key insights into actin cytoskeleton regulation and function.
  • To highlight the contributions of yeast models to understanding eukaryotic actin dynamics.

Main Methods:

  • Review of in vivo and in vitro studies.
  • Integration of molecular genetics, genome-wide analysis, real-time imaging, ultrastructural, and biochemical analyses.
  • Focus on budding yeast (Saccharomyces cerevisiae) and fission yeast (Schizosaccharomyces pombe).

Main Results:

  • Yeast models provide a powerful system for dissecting actin cytoskeleton mechanisms.
  • Studies have defined conserved mechanisms for actin assembly and disassembly in eukaryotes.
  • Insights from yeast have elucidated roles in cell shape, polarity, migration, and more.

Conclusions:

  • Yeast research has significantly advanced the understanding of fundamental actin cytoskeleton regulation.
  • The conserved nature of actin dynamics allows extrapolation of findings across eukaryotes.
  • Continued study in yeast models promises further discoveries in cell biology.