Carba-Sugar Analogs of Glucosamine-6-Phosphate: New Activators for the GlmS Riboswitch

Overview

Journal Chemistry

Specialty Chemistry

Date 2022 Nov 3

PMID 36326082

Authors

David Stangle

Bjarne Silkenath

Paul Gehle

Anna Esser

Gunter Mayer

Valentin Wittmann

Affiliations

Soon will be listed here.

Abstract

Riboswitches are 5'-untranslated mRNA regions mostly found in bacteria. They are promising drug targets to overcome emerging bacterial resistance against commonly used antibiotics. The glmS riboswitch is unique among the family of riboswitches as it is a ribozyme that undergoes self-cleavage upon binding to glucosamine-6-phosphate (GlcN6P). Previously, we showed that carba glucosamine-6-phosphate (carba-GlcN6P) induces self-cleavage of the riboswitch with a potency similar to that of GlcN6P. Here, we report a synthetic approach to a new class of carba-GlcN6P derivatives with an alkoxy substituent in the carba position. Key features of the synthesis are a ring closing metathesis followed by a hydroboration. The strategy gives access to libraries of carba-GlcN6P derivatives. Ribozyme cleavage assays unraveled new activators for the glmS riboswitch from Listeria monocytogenes and Clostridium difficile.

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