Isomorphic Fluorescent Nucleosides Facilitate Real-Time Monitoring of RNA Depurination by Ribosome Inactivating Proteins.

ABSTRACT: Ribosome-inactivating proteins, a family of highly cytotoxic proteins, interfere with protein synthesis by depurinating a specific adenosine residue within the conserved α-sarcin/ricin loop of eukaryotic ribosomal RNA. Besides being biological warfare agents, certain RIPs have been promoted as potential therapeutic tools. Monitoring their deglycosylation activity and their inhibition in real time have remained, however, elusive. Herein, we describe the enzymatic preparation and utility of consensus RIP hairpin substrates in which specific G residues, next to the depurination site, are surgically replaced with ^tz G and ^th G, fluorescent G analogs. By strategically modifying key positions with responsive fluorescent surrogate nucleotides, RIP-mediated depurination can b

SUBMITTER: Cong D 

PROVIDER: S-EPMC9233005 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature