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Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
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Microtubules are dynamic structures and can be regulated by microtubule targeting agents (MTAs). Microtubule destabilizing drugs are a class of MTAs that destabilize and prevent microtubules' polymerization. Both natural and synthetic chemicals can be found under this class of drugs. Vincristine and vinblastine, two vinca alkaloids, and colchicine were among the first to be discovered. These drugs can affect cells in various ways, either by inducing a change in cell morphology, preventing...
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SETDB1 regulates microtubule dynamics.

Rosari Hernandez-Vicens1, Jagreeti Singh1, Nomi Pernicone1

  • 1Department of Molecular Biology, Faculty of Life Sciences, Ariel University, Ariel, Israel.

Cell Proliferation
|November 4, 2022
PubMed
Summary
This summary is machine-generated.

SETDB1, a protein linked to cancer, has a newly discovered cytoplasmic role. It regulates microtubule dynamics by interacting with microtubules and HDAC6, impacting cell division and proliferation.

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Area of Science:

  • Cell Biology
  • Epigenetics
  • Cancer Research

Background:

  • SETDB1 (SET domain bifurcated 1) is a histone methyltransferase crucial for heterochromatin formation.
  • Overexpression of SETDB1 correlates with aggressive phenotypes in various cancers.
  • While primarily nuclear, SETDB1 exhibits cytoplasmic localization in certain cell types, suggesting unexplored functions.

Purpose of the Study:

  • To investigate the potential cytoplasmic functions of SETDB1.
  • To elucidate the role of SETDB1 in regulating microtubule dynamics.

Main Methods:

  • Immunofluorescence and co-sedimentation assays to detect SETDB1-microtubule association.
  • Live-cell imaging to analyze microtubule dynamics and mitotic kinetics.
  • Co-immunoprecipitation to identify protein-protein interactions.

Main Results:

  • SETDB1 was found to associate with and partially colocalize with microtubules.
  • SETDB1 silencing accelerated microtubule polymerization and reduced catastrophe rates, impacting cell proliferation and mitosis.
  • SETDB1 affected microtubule polymerization independently of its catalytic activity and interacted with HDAC6, increasing tubulin acetylation upon SETDB1 silencing.

Conclusions:

  • SETDB1 plays a novel cytoplasmic role in regulating microtubule dynamics.
  • SETDB1 interacts with microtubules and HDAC6 to modulate tubulin deacetylation.
  • These findings suggest SETDB1 as a potential therapeutic target for cancers with aggressive phenotypes.