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Related Experiment Videos

The Ran GTPase regulates kinetochore function.

Alexei Arnaoutov1, Mary Dasso

  • 1Laboratory of Gene Regulation and Development, NICHD, NIH, Building 18, Room 106, 20892, Bethesda, MD, USA

Developmental Cell
|July 11, 2003
PubMed
Summary
This summary is machine-generated.

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The Ran GTPase regulates cell division. Altering its levels impacts the spindle assembly checkpoint, suggesting it directly controls mitotic progression and chromosome segregation during cell cycles.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The Ran GTPase is crucial for nuclear assembly, transport, and spindle formation.
  • Its precise role in mitotic progression and regulation remains incompletely understood.

Purpose of the Study:

  • To investigate the role of Ran GTPase in mitotic regulation.
  • To determine if the spindle assembly checkpoint is responsive to Ran GTPase levels.

Main Methods:

  • Utilized Xenopus egg extracts to manipulate levels of Ran's exchange factor (RCC1) and Ran's GTPase activating protein (RanGAP1) with its accessory factor (RanBP1).
  • Assessed the impact on spindle assembly checkpoint activity, APC/C activity, and kinetochore localization of checkpoint regulators (Mad2, CENP-E, Bub1, Bub3).

Related Experiment Videos

Main Results:

  • Elevated RCC1 levels abrogated the spindle assembly checkpoint and disrupted kinetochore localization of checkpoint proteins.
  • Depletion of RanGAP1/RanBP1 also abrogated checkpoint arrest.
  • Restoring RanGAP1/RanBP1 to extracts with excess RCC1 re-established the spindle checkpoint.
  • RCC1 association with mitotic chromosomes was observed at the metaphase-anaphase transition.

Conclusions:

  • The spindle assembly checkpoint is directly regulated by Ran-GTP levels.
  • Ran GTPase signaling plays a critical role in mitotic progression and timely cell cycle transitions.