Photoaffinity Capture Compounds to Profile the Magic Spot Nucleotide Interactomes. Issue 22 (30th March 2022)

• Record Type: Journal Article
• Authors: Haas, Thomas M.; Laventie, Benoît‐Joseph; Lagies, Simon; Harter, Caroline; Prucker, Isabel; Ritz, Danilo; Saleem‐Batcha, Raspudin; Qiu, Danye; Hüttel, Wolfgang; Andexer, Jennifer; Kammerer, Bernd; Jenal, Urs; Jessen, Henning J.
• Is Part Of: Angewandte Chemie international edition. Volume 61:Issue 22(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-30
• Subjects: Alarmones -- Magic Spot Nucleotides -- Photoaffinity Proteomics -- ppGpp -- Stringent Response; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202201731
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Magic Spot Nucleotides (MSN) regulate the stringent response, a highly conserved bacterial stress adaptation mechanism, enabling survival under adverse external challenges. In times of antibiotic crisis, a detailed understanding of stringent response is essential, as potentially new targets for pharmacological intervention could be identified. In this study, we delineate the MSN interactome in Escherichia coli and Salmonella typhimurium applying a family of trifunctional photoaffinity capture compounds. We introduce MSN probes covering a diverse phosphorylation pattern, such as pppGpp, ppGpp, and pGpp. Our chemical proteomics approach provides datasets of putative MSN receptors both from cytosolic and membrane fractions that unveil new MSN targets. We find that the activity of the non‐Nudix hydrolase ApaH is potently inhibited by pppGpp, which itself is converted to pGpp by ApaH. The capture compounds described herein will be useful to identify MSN interactomes across bacterial species. Abstract : Molecular fishing: A family of trifunctional photoaffinity capture compounds enables the identification of putative Magic Spot Nucleotide receptors by a chemoproteomics approach. The resulting datasets cover several bacterial species, correlate with distinct nucleotide phosphorylation patterns and represent high‐value starting points for future investigations into the complex stringent response mechanism.