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- Title
Isomorphic Fluorescent Nucleosides Facilitate Real‐Time Monitoring of RNA Depurination by Ribosome Inactivating Proteins.
- Authors
Cong, Deyuan; Li, Yao; Ludford, Paul T.; Tor, Yitzhak
- 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 tzG and thG, fluorescent G analogs. By strategically modifying key positions with responsive fluorescent surrogate nucleotides, RIP‐mediated depurination can be monitored in real time by steady‐state fluorescence spectroscopy. Subtle differences observed in preferential depurination sites provide insight into the RNA folding as well as RIPs' substrate recognition features.
- Subjects
NUCLEOSIDES; BIOLOGICAL weapons; RICIN; RNA; RIBOSOMAL RNA; PROTEINS; RIBOSOMES
- Publication
Chemistry - A European Journal, 2022, Vol 28, Issue 35, p1
- ISSN
0947-6539
- Publication type
Academic Journal
- DOI
10.1002/chem.202200994