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Anaphase specific auto-cleavage of separase
Hui Zou1, Olaf Stemman, Jens S Anderson
1Department of Molecular Biology, UT Southwestern Medical Center at Dallas, 75390, USA.
FEBS Letters
|September 26, 2002
Summary
Separase, an enzyme crucial for cell division, undergoes auto-cleavage during anaphase. This self-cleavage activates the enzyme, allowing sister-chromatid separation and ensuring proper cell division progression.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Sister-chromatid separation is essential for accurate cell division and is regulated by the enzyme separase.
- Separase activity is tightly controlled through inhibition by securin and phosphorylation prior to anaphase.
Purpose of the Study:
- To investigate novel regulatory mechanisms of separase activity.
- To identify and characterize proteolytic modifications of separase during cell division.
Main Methods:
- Proteolytic cleavage site mapping in human separase.
- Analysis of separase auto-catalysis during the cell cycle.
- Biochemical assays to assess catalytic activity of cleaved separase fragments.
Main Results:
- Separase undergoes auto-catalytic proteolytic cleavage at three adjacent sites.
- These cleavages occur specifically during anaphase, coinciding with separase activation.
- The resulting fragments remain associated and catalytically active, indicating a functional role.
Conclusions:
- Separase auto-cleavage is a novel mechanism for its activation during anaphase.
- Conserved cleavage sites across vertebrates suggest a critical role in regulating cell division.
- This regulation contributes to the precise timing of sister-chromatid separation.