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Identification of Transcription Factor Regulators using Medium-Throughput Screening of Arrayed Libraries and a Dual-Luciferase-Based Reporter
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Identification of Transcription Factor Regulators using Medium-Throughput Screening of Arrayed Libraries and a Dual-Luciferase-Based Reporter

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Tyrosine phosphorylation controls Runx2-mediated subnuclear targeting of YAP to repress transcription

Sayyed K Zaidi1, Andrew J Sullivan, Ricardo Medina

  • 1Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, MA 01655-0106, USA.

The EMBO Journal
|February 7, 2004
PubMed

Insights

Src/Yes tyrosine kinase signaling inhibits osteoblast activity by promoting the interaction between Yes-associated protein (YAP) and Runx2. This interaction suppresses bone formation, impacting skeletal gene expression.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Bone Biology

Background:

  • Src/Yes tyrosine kinase signaling pathways are critical regulators of bone homeostasis.
  • These pathways are known to inhibit osteoblast activity, a key process in bone formation.

Purpose of the Study:

  • To investigate the role of Yes-associated protein (YAP) as a mediator of Src/Yes signaling in osteoblasts.
  • To elucidate the interaction between YAP and the transcription factor Runx2 and its effect on osteoblast gene expression.

Main Methods:

  • Co-immunoprecipitation assays to detect protein-protein interactions.
  • Chromatin immunoprecipitation (ChIP) to assess gene promoter occupancy.
  • Western blotting to analyze protein phosphorylation and complex formation.
  • Quantitative real-time PCR to measure gene expression levels.

Main Results:

  • Endogenous Yes-associated protein (YAP) directly interacts with the osteoblast transcription factor Runx2.
  • Runx2 recruits YAP to subnuclear domains and the osteocalcin (OC) gene promoter.
  • Inhibition of Src/Yes kinase activity blocks YAP phosphorylation and dissociates Runx2-YAP complexes.
  • Disruption of Runx2-YAP complexes leads to the induction of endogenous OC gene expression.

Conclusions:

  • Src/Yes signaling integrates through the formation of Runx2-YAP transcriptional complexes at specific subnuclear sites.
  • This complex formation attenuates skeletal gene expression, thereby inhibiting osteoblast activity.
  • Targeting the Src/Yes-YAP-Runx2 axis may offer therapeutic strategies for bone-related disorders.

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