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Abi enhances Abl-mediated CDC2 phosphorylation and inactivation
Tzu-Yang Lin1, Chiu-Hui Huang, Wen-Gang Chou
1Division of Molecular and Genomic Medicine, National Health Research Institutes, Taipei, Taiwan.
Journal of Biomedical Science
|December 14, 2004
Summary
Abl interactor (Abi) acts as an adaptor protein, linking Abelson tyrosine kinase (Abl) and Cdc2. This complex regulates Cdc2 activity and influences cell growth, suggesting Abl signaling
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Abelson tyrosine kinase (Abl) regulates cellular processes via adaptor proteins.
- Abl interactors (Abi) are known adaptor proteins for Abl kinase.
- The role of Abi in linking Abl and cell cycle regulators is unexplored.
Purpose of the Study:
- To identify novel Abi-binding proteins.
- To investigate the role of Abi in mediating interactions between Abl and Cdc2.
- To elucidate the functional consequences of the Abl-Abi-Cdc2 complex on cell cycle control.
Main Methods:
- Yeast two-hybrid screening to identify Abi-binding proteins.
- Co-immunoprecipitation and Western blotting to confirm protein complex formation in Drosophila and mammalian cells.
- In vitro kinase assays to assess Cdc2 activity.
- Cell growth assays in Drosophila S2 cells.
Main Results:
- Cdc2 was identified as a novel Abi-binding protein.
- Abi facilitates the formation of a trimeric complex comprising Abl, Abi, and Cdc2.
- Abi enhances Abl-mediated phosphorylation of Cdc2 at tyrosine 15, leading to Cdc2 inactivation.
- Coexpression of Abl and Abi suppresses cell growth in Drosophila S2 cells.
Conclusions:
- Abi serves as a crucial adaptor protein linking Abl and Cdc2.
- The Abl-Abi complex regulates Cdc2 kinase activity, impacting cell cycle progression.
- Abl signaling pathway is implicated in the downregulation of Cdc2 kinase activity and cell growth control.