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Complete and limited proteolysis in cell cycle progression
Brigitte Goulet1, Alain Nepveu
1Department of Biochemistry, McGill University, Montreal, Canada.
Cell Cycle (Georgetown, Tex.)
|July 16, 2004
Summary
Limited proteolysis regulates cell cycle progression. The Cathepsin L protease processes the CDP/Cux transcription factor in the nucleus, revealing a novel regulatory mechanism controlling cell division.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Cell cycle progression relies on regulated protein degradation.
- Limited proteolysis is an emerging mechanism modulating protein function.
- The role of Cathepsin L in nuclear events was previously unknown.
Purpose of the Study:
- To investigate the role of limited proteolysis in cell cycle regulation.
- To determine if Cathepsin L participates in cell cycle control.
- To explore the nuclear localization and function of Cathepsin L.
Main Methods:
- Analysis of protein processing during the G(1)/S transition.
- Identification of proteases involved in transcription factor modification.
- Subcellular localization studies of Cathepsin L.
Main Results:
- The CDP/Cux transcription factor undergoes proteolytic processing at the G(1)/S transition.
- Cathepsin L was identified as the protease responsible for CDP/Cux processing.
- Evidence suggests Cathepsin L can function within the nucleus.
Conclusions:
- Limited proteolysis, exemplified by CDP/Cux processing by Cathepsin L, is a key regulator of cell cycle progression.
- Cathepsin L has a nuclear function in modulating transcription factor activity, challenging previous understanding of its targeting.