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The Ras Gene02:38

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The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
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Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
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Stabilization of the RAS:PDE6D Complex Is a Novel Strategy to Inhibit RAS Signaling.

Tamas Yelland1, Esther Garcia1, Charles Parry2

  • 1CRUK Beatson Institute, Glasgow G61 1BD, United Kingdom.

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|February 2, 2022
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Researchers developed a new strategy to target RAS (Rat Sarcoma oncogene) proteins by stabilizing their interaction with PDE6D, a prenyl-binding protein. This approach disrupts RAS localization, inhibiting cancer signaling pathways and offering a new avenue for anticancer drug development.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Drug Discovery

Background:

  • RAS proteins are crucial for cell signaling and are major anticancer drug targets.
  • RAS requires membrane localization for activation, but direct inhibition is challenging.
  • Disrupting RAS localization offers a novel therapeutic strategy.

Purpose of the Study:

  • To develop a novel strategy for targeting RAS by stabilizing its interaction with PDE6D.
  • To inhibit oncogenic RAS/ERK signaling by disrupting RAS localization.
  • To lay the foundation for developing small-molecule RAS:PDE6D complex stabilizers as anticancer agents.

Main Methods:

  • Rational design of RAS point mutations to stabilize the RAS:PDE6D complex.
  • Surface Plasmon Resonance (SPR) fragment screening to identify binding fragments.
  • Cocrystal structure analysis to confirm binding at the KRAS:PDE6D interface.

Main Results:

  • Engineered RAS mutations increased affinity for PDE6D, stabilizing the complex.
  • Stabilized RAS:PDE6D complexes were redirected to the cytoplasm and primary cilium.
  • Oncogenic RAS/ERK signaling was inhibited.
  • SPR screening identified fragments binding the KRAS:PDE6D interface.
  • KRAS:PDE6D stoichiometric ratios vary across cell lines, indicating potential cell-type-dependent effects.

Conclusions:

  • Stabilizing the RAS:PDE6D complex is a viable strategy for inhibiting oncogenic RAS signaling.
  • This approach offers a new foundation for developing anticancer therapeutics.
  • The cell-type-specific impact of this strategy warrants further investigation.