Issue 36, 2025

Expanding the binding space of argonaute-2: incorporation of either E or Z isomers of 6′-vinylphosphonate at the 5′ end of the antisense strand improves RNAi activity

Abstract

A phosphate or a phosphate mimic at the 5′ terminus of the antisense strand of a small interfering RNA (siRNA) is required for efficient loading into the RISC complex through the MID domain binding pocket of Ago2. Introduction of 5′-E-vinylphosphonate improves this binding and siRNA potency, but the Z isomer does not. Here, we demonstrate that both the E and Z isomers of 6′-vinylphosphonate at the 5′ ends of antisense strands of siRNAs have equivalent potencies.

Graphical abstract: Expanding the binding space of argonaute-2: incorporation of either E or Z isomers of 6′-vinylphosphonate at the 5′ end of the antisense strand improves RNAi activity

Supplementary files

Article information

Article type
Communication
Submitted
21 Jan 2025
Accepted
21 Mar 2025
First published
08 Apr 2025

Chem. Commun., 2025,61, 6659-6662

Expanding the binding space of argonaute-2: incorporation of either E or Z isomers of 6′-vinylphosphonate at the 5′ end of the antisense strand improves RNAi activity

D. Datta, J. Kundu, P. Miller, M. S. Khan, J. Salinas, J. Qin, S. LeBlanc, T. Nguyen, H. Peng, C. S. Theile, M. Egli and M. Manoharan, Chem. Commun., 2025, 61, 6659 DOI: 10.1039/D5CC00348B

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