5′-Phosphonate modified oligoadenylates as potent activators of human RNase L

The oligoadenylate synthetase-ribonuclease L pathway is a major player in the interferon-induced antiviral defense mechanism of cells. Upon sensing viral dsRNA, 5 '-phosphorylated 2 ',5 '-oligoadenylates are synthesized, and subsequently activate latent RNase L. To determine the influence of 5 '-phosphate end on the activation of human RNase L, four sets of 5 '-phosphonate modified oligoadenylates were prepared on solid-phase. The ability of these 5 '-modified oligoadenylates bearing shortened, isosteric and prolonged phosphonate linkages to activate RNase L was explored. We found that isosteric linkages and linkages prolonged by one atom were in general well tolerated by the enzyme with the EC50 values comparable to that of the natural activator. In contrast, linkages shortened by one atom or prolonged by two atoms exhibited decrease in the activity.

Automated summary

The oligoadenylate synthetase-ribonuclease L pathway plays a crucial role in the interferon-induced antiviral defense mechanism of cells. The study investigates the influence of 5'-phosphate end on the activation of human RNase L. Results show that isosteric linkages and linkages prolonged by one atom are well tolerated by the enzyme, while linkages shortened by one atom or prolonged by two atoms exhibit decreased activity.