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Cdk1 is essential for mammalian cyclosome/APC regulation
T Listovsky1, A Zor, A Laronne
1Department of Genetics, The Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
Experimental Cell Research
|March 1, 2000
Summary
The anaphase-promoting complex (APC/C) controls cell division. In mammalian cells, Cdk1 regulates APC/C activity, preventing premature mitotic exit and ensuring proper cell cycle progression.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- The anaphase-promoting complex/cyclosome (APC/C) is a crucial ubiquitin ligase complex.
- APC/C regulates cell cycle progression by targeting key proteins for degradation.
- APC/C activity is modulated by regulatory proteins like Fizzy/cdc20 (Fzy) and Fizzy-related/Hct1/Cdh1 (Fzr).
Purpose of the Study:
- To investigate APC/C regulation in mammalian cells in vivo.
- To elucidate the role of Cdk1 and cdc14 phosphatase in APC/C pathway.
- To understand how APC/C controls cell cycle checkpoints.
Main Methods:
- Overexpression of Fzr in mammalian cells.
- Inhibition of Cdk1 kinase activity.
- Analysis of APC/C activity and substrate specificity in vivo.
Main Results:
- Fzr overexpression and Cdk1 inhibition override the prometaphase checkpoint.
- Cdk1 negatively regulates Fzr activation of the APC/C.
- Mammalian cdc14 phosphatase is involved in APC/C pathway regulation.
- Cdk1-cyclin B acts as an inhibitor, activator, and substrate of the APC/C.
Conclusions:
- Cdk1 is essential for coordinating APC/C activities and maintaining checkpoint control.
- Cdk1 prevents Fzr from prematurely activating the APC/C and causing mitotic exit.
- The findings reveal a complex regulatory role of Cdk1 in the APC/C pathway.