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A Dimeric Rocaglate Promotes Multivalent eIF4A-RNA Assembly.

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Dimeric rocaglate ligands, like BisRoc, enhance translation suppression and cancer cell specificity. BisRoc

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Area of Science:

  • Molecular biology
  • Biochemistry
  • Pharmacology

Background:

  • Ligand dimerization is a key strategy for improving drug efficacy.
  • Rocaglamide (RocA) is a natural product with therapeutic potential.
  • Developing novel ligands with enhanced specificity is crucial for cancer therapy.

Purpose of the Study:

  • To investigate the potential of dimeric rocaglate ligands for enhanced therapeutic effects.
  • To explore the mechanism of action and specificity of BisRoc, a novel dimeric rocaglate.
  • To understand the role of cellular factors in BisRoc activity.

Main Methods:

  • Synthesis and characterization of BisRoc, a dimeric rocaglate.
  • Cancer cell line panel screening to assess specificity and potency.
  • CRISPR interference (CRISPRi) screening to identify factors influencing BisRoc activity.
  • Biochemical assays to study eIF4A1/eIF4A2 dimerization and RNA-binding interactions.

Main Results:

  • BisRoc potently and durably suppresses translation with greater specificity than monomeric RocA.
  • BisRoc activity is modulated by cellular factors including IFITM proteins, ABC transporters, and eIF4A2.
  • eIF4A1 and eIF4A2 exhibit differential sensitivity to BisRoc-induced dimerization.
  • BisRoc promotes the assembly of higher-order eIF4A-RNA complexes and stress granule formation.

Conclusions:

  • Ligand dimerization is an effective strategy to enhance the potency and specificity of rocaglate-based therapeutics.
  • BisRoc represents a promising lead compound for cancer therapy due to its enhanced properties.
  • The findings provide insights into the regulation of translation and RNA-binding protein complex assembly.