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The cyclin-dependent kinase 11(p46) isoform interacts with RanBPM
Monika Mikolajczyk1, Jiaqi Shi, Richard R Vaillancourt
1Department of Pathology, College of Medicine, University of Arizona, Tucson, AZ 85724, USA.
Biochemical and Biophysical Research Communications
|September 27, 2003
Summary
We discovered that Ran-binding protein (RanBPM) interacts with cyclin-dependent kinase 11 (CDK11(p46)), a key player in apoptosis. This interaction reveals a new signaling pathway for CDK11(p46) in programmed cell death.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Cyclin-dependent kinase 11 (CDK11) exists as larger isoforms (CDK11(p110)) and a smaller, apoptosis-promoting form (CDK11(p46)) generated during programmed cell death.
- The precise signaling mechanisms of CDK11(p46) in apoptosis remain largely uncharacterized.
Purpose of the Study:
- To identify interacting partners of the caspase-processed CDK11(p46).
- To elucidate the molecular mechanisms underlying CDK11(p46)-mediated apoptosis signaling.
Main Methods:
- Yeast two-hybrid screening to identify protein-protein interactions.
- In vitro binding assays and studies in human cells to confirm interactions.
- Analysis of protein domains, specifically the SPRY domain of RanBPM.
- In vitro kinase assays to assess phosphorylation activity.
Main Results:
- Ran-binding protein (RanBPM) was identified as a direct interacting partner of CDK11(p46).
- The interaction between CDK11(p46) and RanBPM was confirmed both in vitro and within human cells.
- The SPRY domain of RanBPM is essential for its association with CDK11(p46).
- CDK11(p46) was demonstrated to phosphorylate RanBPM.
Conclusions:
- RanBPM is a novel binding partner for the apoptosis-associated kinase CDK11(p46).
- The interaction is mediated by the SPRY domain of RanBPM, suggesting a structural basis for the complex.
- CDK11(p46) possesses kinase activity towards RanBPM, indicating a potential regulatory mechanism within the apoptosis pathway.