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SHOC2 complex-driven RAF dimerization selectively contributes to ERK pathway dynamics.

Isabel Boned Del Río1, Lucy C Young1, Sibel Sari1

  • 1University College London Cancer Institute, University College London, WC1E 6DD London, United Kingdoms.

Proceedings of the National Academy of Sciences of the United States of America
|June 20, 2019
PubMed
Summary
This summary is machine-generated.

The SHOC2 complex is crucial for rapid ERK pathway activation by dephosphorylating RAF kinases. However, alternative pathways exist, and KRAS mutant cells specifically depend on SHOC2 for sustained signaling in certain conditions.

Keywords:
ERKMRASRAFRASSHOC2

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Area of Science:

  • Cellular signaling
  • Molecular biology
  • Oncology

Background:

  • RAF kinases are central to cell signaling and disease, but their regulation, including heterodimerization and inhibitory dephosphorylation at S259, remains incompletely understood.
  • The SHOC2 complex, comprising SHOC2, MRAS, and PP1, acts as a RAF S259 holophosphatase, and its dysregulation is implicated in Noonan syndrome.

Purpose of the Study:

  • To elucidate the role of the SHOC2 complex in RAF activation and downstream signaling.
  • To investigate context-dependent mechanisms of RAF and ERK pathway activation.
  • To explore the therapeutic potential of targeting the SHOC2 complex for selective ERK pathway inhibition.

Main Methods:

  • Biochemical assays to analyze RAF kinase activity and complex formation.
  • Cellular experiments using EGF stimulation in DLD-1 cells.
  • Investigation of RAF and ERK pathway dynamics under 2D and anchorage-independent conditions.
  • Analysis of KRAS mutant cell signaling.

Main Results:

  • SHOC2 complex-mediated S259 RAF dephosphorylation is essential for growth factor-induced RAF heterodimerization and MEK dissociation from BRAF.
  • SHOC2-independent RAF and ERK activation mechanisms involving CRAF N-region phosphorylation were identified.
  • SHOC2 is critical for rapid, transient ERK activation but not for slow, sustained phases driven by RAS proteins and CRAF.
  • While SHOC2 is dispensable for 2D proliferation due to redundant pathways, KRAS mutant cells rely on SHOC2 for anchorage-independent ERK signaling.

Conclusions:

  • SHOC2 plays a context-dependent role in ERK pathway dynamics, preferentially engaged by KRAS oncogenic signaling.
  • The study provides a biochemical framework for targeting the SHOC2 holophosphatase for selective ERK pathway inhibition.