Cyclopropane-1,2-dicarboxylic acids as new tools for the biophysical investigation of O-acetylserine sulfhydrylases by fluorimetric methods and saturation transfer difference (STD) NMR

Giannamaria Annunziato, Marco Pieroni, Roberto Benoni, Barbara Campanini, Thelma A. Pertinhez, Chiara Pecchini, Agostino Bruno, Joana Magalhães, Stefano Bettati, Nina Franko, Andrea Mozzarelli, Gabriele Costantino

Research output: Contribution to journalArticlepeer-review

Abstract

Cysteine is a building block for many biomolecules that are crucial for living organisms. O-Acetylserine sulfhydrylase (OASS), present in bacteria and plants but absent in mammals, catalyzes the last step of cysteine biosynthesis. This enzyme has been deeply investigated because, beside the biosynthesis of cysteine, it exerts a series of “moonlighting” activities in bacteria. We have previously reported a series of molecules capable of inhibiting Salmonella typhimurium (S. typhymurium) OASS isoforms at nanomolar concentrations, using a combination of computational and spectroscopic approaches. The cyclopropane-1,2-dicarboxylic acids presented herein provide further insights into the binding mode of small molecules to OASS enzymes. Saturation transfer difference NMR (STD-NMR) was used to characterize the molecule/enzyme interactions for both OASS-A and B. Most of the compounds induce a several fold increase in fluorescence emission of the pyridoxal 5′-phosphate (PLP) coenzyme upon binding to either OASS-A or OASS-B, making these compounds excellent tools for the development of competition-binding experiments.

Original languageEnglish
Pages (from-to)78-87
Number of pages10
JournalJournal of Enzyme Inhibition and Medicinal Chemistry
Volume31
DOIs
Publication statusPublished - Nov 4 2016

Keywords

  • cyclopropane-1,2-dicarboxylic acids
  • cysteine biosynthesis
  • drug resistance
  • O-Acetylserine sulfhydrylase
  • saturation transfer difference-NMR

ASJC Scopus subject areas

  • Pharmacology
  • Drug Discovery

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