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Related Experiment Videos

Binding of CDK9 to TRAF2

T K MacLachlan1, N Sang, A De Luca

  • 1Sbarro Institute for Cancer Research and Molecular Medicine, Department of Pathology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA.

Journal of Cellular Biochemistry
|November 25, 1998
PubMed
Summary

Cyclin-dependent kinase 9 (CDK9) interacts with tumor necrosis factor receptor-associated factor 2 (TRAF2) in differentiated tissues. This interaction may be crucial for cell survival signaling in myotubes.

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Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Biochemistry

Background:

  • Cyclin-dependent kinase 9 (CDK9) exhibits increased kinase activity and tissue-specific expression in differentiated cells.
  • The precise mechanisms regulating CDK9's differentiation-specific functions are not fully understood.

Purpose of the Study:

  • To identify proteins interacting with CDK9 and contributing to its differentiation-specific roles.
  • To investigate the functional implications of CDK9-interacting proteins in cellular signaling pathways.

Main Methods:

  • Yeast two-hybrid screening of a mouse embryonic library to identify CDK9-interacting proteins.
  • Analysis of protein-protein interaction domains within identified partners.
  • Assessment of endogenous protein interactions in differentiated tissues.

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Main Results:

  • Tumor necrosis factor receptor-associated factor 2 (TRAF2) was identified as a CDK9-interacting protein.
  • CDK9 binds to the conserved TRAF-C domain of TRAF2, a known kinase-binding motif.
  • Endogenous interaction between CDK9 and TRAF2 is specific to differentiated tissues.

Conclusions:

  • TRAF2 is a novel interacting partner of CDK9, suggesting a role in CDK9-mediated signaling.
  • TRAF2-mediated signaling pathways may involve additional kinases like CDK9 to regulate cell survival.
  • This interaction is particularly relevant for cell survival in myotubes, a cell type impacted in TRAF2 knockout models.