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KAP: a dual specificity phosphatase that interacts with cyclin-dependent kinases
1Howard Hughes Medical Institute, Cold Spring Harbor Laboratory, NY 11724.
Summary
Researchers identified a novel dual specificity phosphatase, KAP, that interacts with cell cycle regulators like CDK2 and cdc2. This discovery suggests KAP may play a role in regulating the cell cycle.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Cyclin-dependent kinases (CDKs) are crucial regulators of the cell cycle, controlling transitions between phases.
- CDK2 is particularly important for regulating the G1 and S phases in mammalian cells.
Purpose of the Study:
- To identify novel proteins interacting with CDK2 using a yeast two-hybrid screen.
- To characterize the enzymatic activity and interaction partners of a newly identified CDK2-interacting protein.
Main Methods:
- Yeast two-hybrid protein interaction screen.
- In vitro phosphatase assays.
- Co-immunoprecipitation in mammalian cells.
Main Results:
- A novel protein, KAP, containing a protein tyrosine phosphatase motif (HCXX-XXGR) was identified.
- KAP demonstrated dual specificity phosphatase activity, acting on both phosphotyrosine and phosphoserine residues.
- KAP interacted with both cdc2 and CDK2 in yeast and mammalian cells, showing a preference for cdc2.
Conclusions:
- KAP represents a new class of dual specificity phosphatase.
- KAP's interaction with multiple CDKs suggests a role in cell cycle regulation.