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Related Experiment Video

Updated: Mar 9, 2026

Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
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A sequential multi-target Mps1 phosphorylation cascade promotes spindle checkpoint signaling.

Zhejian Ji1, Haishan Gao1, Luying Jia1

  • 1Department of Pharmacology, Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, United States.

Elife
|January 11, 2017
PubMed
Summary

The master spindle checkpoint kinase Mps1 orchestrates chromosome segregation by sequentially phosphorylating Knl1, Bub1, and Mad1. This cascade ensures accurate cell division by controlling the mitotic checkpoint complex.

Keywords:
E. colibiochemistrycell biologyhumankinetochoreprotein kinasespindle checkpointxenopus

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • The spindle checkpoint ensures accurate chromosome segregation during cell division.
  • Mps1 (master spindle checkpoint kinase) is crucial for sensing kinetochore-microtubule attachment.
  • Knl1 phosphorylation by Mps1 recruits checkpoint complexes to unattached kinetochores.

Purpose of the Study:

  • To elucidate the mechanism by which Mps1 promotes spindle checkpoint activation.
  • To investigate the role of Mps1 phosphorylation of Bub1 and Mad1 in checkpoint signaling.
  • To understand how Mps1 integrates kinetochore-microtubule attachment signals.

Main Methods:

  • In vitro biochemical reconstitution assays.
  • Site-directed mutagenesis of Mps1 phosphorylation sites in Bub1 and Mad1.
  • Analysis of spindle checkpoint function in human cells.

Main Results:

  • Mps1 promotes APC/C inhibition by phosphorylating Bub1 and Mad1.
  • Phosphorylated Bub1 binds Mad1-Mad2, and phosphorylated Mad1 interacts with Cdc20.
  • Mutations in Mps1 phosphorylation sites on Bub1 or Mad1 disrupt the spindle checkpoint in human cells.

Conclusions:

  • Mps1 activates the spindle checkpoint through a sequential phosphorylation cascade involving Knl1, Bub1, and Mad1.
  • This multi-target phosphorylation mechanism enhances checkpoint responsiveness to Mps1 and attachment status.
  • The findings provide a detailed molecular understanding of spindle checkpoint regulation.