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Orchestrating Nuclear Envelope Sealing during Mitosis.

Marina Vietri1, Harald Stenmark1

  • 1Centre for Cancer Cell Reprogramming, Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Montebello, N-0379 Oslo, Norway; Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Montebello, N-0379 Oslo, Norway.

Developmental Cell
|December 5, 2018
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Summary
This summary is machine-generated.

The ESCRT-III machinery seals the nuclear envelope after cell division. A new study reveals CC2D1B protein coordinates ESCRT-III assembly and disassembly, crucial for mitotic spindle regulation.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Nuclear envelope sealing during mitotic exit is essential for cell viability.
  • The Endosomal Sorting Complexes Required for Transport (ESCRT)-III machinery plays a critical role in membrane remodeling events, including nuclear envelope sealing.
  • Understanding the regulation of ESCRT-III function during the cell cycle is crucial for comprehending cell division fidelity.

Purpose of the Study:

  • To identify novel proteins associated with the ESCRT-III machinery during mitotic exit.
  • To elucidate the function of the ESCRT-III-associated protein CC2D1B in nuclear envelope sealing and mitotic spindle dynamics.
  • To investigate the mechanism by which CC2D1B coordinates ESCRT-III assembly and disassembly.

Main Methods:

  • Immunofluorescence microscopy to visualize protein localization during mitosis.
  • Biochemical assays to study protein-protein interactions.
  • Lipid-binding assays to assess CC2D1B's interaction with membranes.
  • RNA interference (RNAi) or CRISPR-Cas9 mediated gene knockdown to study protein function in vivo.

Main Results:

  • CC2D1B is identified as an ESCRT-III-associated protein.
  • CC2D1B exhibits lipid-binding properties, suggesting a role in membrane targeting.
  • CC2D1B regulates the assembly and disassembly dynamics of ESCRT-III on the mitotic spindle.
  • CC2D1B is crucial for efficient sealing of the nascent nuclear envelope during mitotic exit.

Conclusions:

  • CC2D1B acts as a lipid-binding coordinator for the ESCRT-III machinery during late mitosis.
  • CC2D1B's function is essential for proper ESCRT-III-mediated nuclear envelope sealing and mitotic spindle regulation.
  • This study reveals a novel regulatory mechanism for ESCRT-III function in cell division.