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Updated: Jul 4, 2026

Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
08:33

Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis

Published on: December 5, 2017

A survivin-ran complex regulates spindle formation in tumor cells

Fang Xia1, Pedro M Canovas, Thomas M Guadagno

  • 1Department of Cancer Biology, LRB428, University of Massachusetts Medical School, 364 Plantation Street, Worcester, MA 01605, USA.

Molecular and Cellular Biology
|July 2, 2008
PubMed

Insights

Survivin, a key mitosis regulator, binds to the small GTPase Ran. This interaction is crucial for proper mitotic spindle formation, especially in cancer cells, revealing a novel cancer-specific pathway.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Aberrant cell division is a hallmark of cancer.
  • The molecular mechanisms governing cell division in tumors are not fully understood.
  • Survivin is an essential mitosis regulator overexpressed in various cancers.

Purpose of the Study:

  • To identify novel molecular partners of survivin using high-throughput proteomics.
  • To investigate the functional significance of survivin-interacting proteins in cancer cell division.
  • To elucidate the role of survivin in Ran signaling pathways.

Main Methods:

  • High-throughput proteomics screening to identify survivin-binding proteins.
  • Biochemical assays to characterize the survivin-Ran interaction.
  • Cellular experiments to assess the impact of disrupting the survivin-Ran complex on mitosis.

Main Results:

  • Survivin was found to associate with the small GTPase Ran in a conserved manner.
  • This interaction is cell-cycle regulated, dependent on Ran-GTP, and involves a specific binding site on survivin.
  • Disruption of the survivin-Ran complex impaired TPX2 delivery to microtubules, leading to aberrant spindle formation and chromosome missegregation in tumor cells.

Conclusions:

  • Survivin acts as a novel effector of Ran signaling.
  • The survivin-Ran pathway is preferentially utilized for mitotic spindle assembly in tumor cells.
  • Targeting this pathway could offer a strategy for cancer therapy.

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