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The substrates of the cdc2 kinase
1Swiss Institute for Experimental Cancer Research, (ISREC), Epalinges.
Seminars in Cell Biology
|August 1, 1991
Summary
The eukaryotic cell cycle relies on cdc2 kinases for DNA replication and mitosis. Recent findings identify key substrates, revealing how cdc2 kinase directly phosphorylates structural proteins to drive mitotic entry.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- The eukaryotic cell cycle involves DNA replication (S phase) and mitosis (M phase).
- The cdc2 cycle paradigm posits that serine-threonine protein kinases, homologs of fission yeast cdc2, drive these events.
- Understanding cdc2 kinase function requires identifying its physiological substrates and their roles in cell cycle progression.
Purpose of the Study:
- To identify physiological substrates of cdc2 kinases, particularly those involved in early cell cycle stages (G1 and S phases).
- To elucidate how the phosphorylation of these substrates by cdc2 kinase promotes cell cycle progression.
- To investigate the mechanisms by which cdc2 kinase triggers entry into mitosis.
Main Methods:
- Investigating the functional homologs of the fission yeast cdc2 gene.
- Identifying physiological targets of the mitotic cdc2 kinase.
- Analyzing the role of protein phosphorylation in cell cycle regulation.
Main Results:
- Several likely physiological targets of the mitotic cdc2 kinase have been identified.
- Evidence suggests cdc2 kinase directly phosphorylates abundant structural proteins.
- Information regarding substrates relevant to G1 and S phases remains limited.
Conclusions:
- Mitotic cdc2 kinase plays a crucial role in initiating regulatory pathways for mitotic entry.
- Direct phosphorylation of structural proteins by cdc2 kinase is a mechanism to trigger mitosis.
- Further research is needed to fully understand cdc2 kinase substrates in early cell cycle phases.