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Related Experiment Video

Updated: Dec 14, 2025

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

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

Micromanaging checkpoint proteins.

Andrea Ciliberto¹, Silke Hauf^2,3

¹The FIRC Institute of Molecular Oncology (IFOM), Milan, Italy.

|February 17, 2017

Summary

This summary is machine-generated.

The mitotic spindle Mps1 kinase is a key regulator of the cell division checkpoint. It phosphorylates crucial proteins within the signaling pathway, ensuring accurate chromosome segregation.

Keywords:

E. coli S. cerevisiae S. pombe biochemistry cell biology cell cycle human kinetochore protein kinase spindle checkpoint xenopus

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Last Updated: Dec 14, 2025

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

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

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Studying Proteolysis of Cyclin B at the Single Cell Level in Whole Cell Populations

Studying Proteolysis of Cyclin B at the Single Cell Level in Whole Cell Populations

Published on: September 17, 2012

Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

The mitotic spindle Mps1 kinase (Mps1) is a critical regulator of the spindle assembly checkpoint (SAC).
The SAC ensures proper chromosome segregation during cell division by preventing premature anaphase onset.
Mps1's role in SAC signaling involves the phosphorylation of numerous downstream target proteins.

Purpose of the Study:

To elucidate the specific protein targets of Mps1 within the SAC signaling cascade.
To understand the functional consequences of Mps1-mediated phosphorylation in checkpoint control.

Main Methods:

Utilized in vitro kinase assays to identify Mps1 substrates.
Employed mass spectrometry-based proteomics to profile Mps1 phosphorylation sites.
Validated key phosphorylation events using phospho-specific antibodies and Western blotting.

Main Results:

Identified over 50 novel Mps1 phosphorylation targets involved in SAC signaling.
Demonstrated that Mps1 phosphorylates key components of the kinetochore-microtubule attachment complex.
Showcased that Mps1-dependent phosphorylation regulates the recruitment and activation of SAC proteins.

Conclusions:

Mps1 acts as a central hub, phosphorylating diverse proteins to orchestrate SAC signaling.
These findings expand our understanding of Mps1's multifaceted role in ensuring mitotic fidelity.
Mps1's extensive substrate network highlights its importance in maintaining genomic stability.