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Phosphorothioate modified oligonucleotide-protein interactions.

Stanley T Crooke1, Timothy A Vickers1, Xue-Hai Liang1

  • 1Ionis Pharmaceuticals, Inc., Carlsbad, CA, USA.

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Antisense oligonucleotides (ASOs) are modified to improve drug properties. Understanding how these modified ASOs interact with proteins is key to developing safer and more effective ASO therapeutics.

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Area of Science:

  • Medicinal Chemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Antisense oligonucleotides (ASOs) are therapeutic agents that modulate gene expression by hybridizing with target RNAs.
  • Chemical modifications, such as phosphorothioate (PS) backbones, enhance ASO properties like RNA binding affinity and protein interactions.
  • PS ASO-protein interactions significantly influence ASO performance, affecting distribution, cellular uptake, trafficking, potency, and toxicity.

Purpose of the Study:

  • To review recent advancements in understanding protein interactions with modified PS ASOs.
  • To identify key proteins interacting with PS ASOs and elucidate their impact on ASO performance.
  • To explore structure-activity relationships between PS ASO modifications and protein binding.

Main Methods:

  • Literature review of studies investigating PS ASO-protein interactions.
  • Analysis of how these interactions affect various aspects of ASO pharmacology.
  • Examination of structure-activity relationships concerning chemical modifications and protein binding.

Main Results:

  • PS ASOs exhibit increased binding affinity to target RNAs and enhanced interactions with proteins.
  • Protein interactions critically influence ASO biodistribution, cellular entry, intracellular transport, efficacy, and safety profiles.
  • Specific chemical modifications on PS ASOs can be altered to modulate protein interactions.

Conclusions:

  • A comprehensive understanding of PS ASO-protein interactions is crucial for designing improved ASO therapeutics.
  • Tailoring chemical modifications can optimize ASO-protein interactions, leading to enhanced therapeutic indices.
  • This knowledge facilitates the development of safer and more potent antisense oligonucleotide drugs.