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MORC3 Forms Nuclear Condensates through Phase Separation.

Yi Zhang1, Bianca Bertulat2, Adam H Tencer1

  • 1Department of Pharmacology, University of Colorado School of Medicine, 12801 East 17th Avenue, Aurora, CO 80045, USA.

Iscience
|July 9, 2019
PubMed
Summary

Microrchidia 3 (MORC3), a human ATPase, forms dynamic, liquid-like condensates in the cell nucleus. Its ATPase activity drives this phase separation, influencing nuclear compartmentalization and chromatin organization.

Keywords:
Biological SciencesBiophysical ChemistryMolecular Biology

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Area of Science:

  • Cell biology
  • Molecular biology
  • Biochemistry

Background:

  • Phase separation creates functional structures within cells, impacting nuclear organization.
  • Microrchidia 3 (MORC3) is a human ATPase linked to autoimmune diseases and cancer.

Purpose of the Study:

  • To investigate the role of MORC3 in nuclear phase separation.
  • To elucidate the mechanism of MORC3-mediated nuclear compartmentalization.

Main Methods:

  • Fluorescence live-cell imaging to observe MORC3 condensates.
  • In vitro assays to study MORC3's ATPase activity and phase separation.
  • Analysis of MORC3 interaction with DNA and histone H3.

Main Results:

  • MORC3 forms liquid-like, heterogeneous condensates in the nucleus.
  • MORC3 condensates exhibit dynamic morphological changes during the cell cycle.
  • ATPase activity, DNA binding, and histone H3 interaction are crucial for MORC3 phase separation.

Conclusions:

  • MORC3's ATPase function drives its nuclear phase separation.
  • This process mediates MORC3 nuclear compartmentalization, potentially affecting chromatin organization.