Prof. Michael M. Meijler/ Ben-Gurion University of the Negev, Be'er Sheva, Israel, Department of Chemistry: Chemical information exchange between species: living together by the grace of good chemistry

When: Friday, 14.07.2023, 10:00

Where: Lecture hall 2 of the Faculty of Earth Sciences, Geographie and Astronomy, Josef -Holaubek-Platz 2 (UZA II), 1090 Wien, Stock OG01, Nr. 2A122


Life on earth is heavily based on chemical communication between cells. Quorum sensing enables unicellular organisms to coordinate their behavior and function in such a way that they can adapt to changing environments and compete, as well as coexist, with multicellular organisms. Prime examples of this phenomenon are displayed by the opportunistic pathogens Pseudomonas aeruginosa and Staphylococcus aureus, which cause disease in humans – but most often don’t. Quorum sensing in these pathogens is mediated by small amphiphilic signaling molecules such as 3-oxo-C12-HSL, or small peptides, leading to biofilm formation and secretion of virulence factors. The Meijler group is targeting QS in various pathogens with several chemical tools, such as a set of electrophilic and photoactivatable ‘tag-free’ probes that are designed to bind QS receptors covalently. These probes are used as molecular tools to obtain new insights into the mechanisms of activation, deactivation and recognition of bacterial quorum sensing – through the use of bioorthogonal chemistry. Diverse eukaryotes have been found to react strongly to the presence of these compounds, and the recognition of QSMs is mediated by mostly unknown receptors. Recently, for example, we identified and validated the role of a human receptor for HSLs, called the Major Vault Protein (MVP), as an important immunomodulator, and we also identified new receptors for QSMs in other species. We also recently identified an exciting new mode of coexistence between bacterial pathogens using untargeted metabolomics and synthetic confrmation.

   S. Uzi-Gavrilov, Z. Tik, O. Sabti, M. M. Meijler: Chemical Modification of a Bacterial Siderophore by a Competitor in Dual-Species Biofilms Angew. Chem. Int. Ed., e202300585, 2023

   R. Gregor, M. Probst, S. Eyal, A. Aksenov, G. Sasson, I. Horovitz, P. C. Dorrestein, M. M. Meijler, I. Mizrahi: Mammalian gut metabolomes mirror microbiome composition and host phylogeny ISME J. 16 (5), 1262-1274, 2022

   J. Rayo, R. Gregor, N. T. Jacob, et al, V. V. Kravchenko, M. M. Meijler: Immunoediting Role for Major Vault Protein in Apoptotic Signaling Induced by bacterial N-Acyl Homoserine Lactones Proc. Natl. Acad. Sci. USA, 118(12), 2021

   A. Yashkin, J. Rayo, L. Grimes, M. Welch, M. M. Meijler: Short-Chain Reactive Probes to Unravel the Pseudomonas Aeruginosa Quorum Sensing Regulon Chem. Sci., 12 (12), 4570-4581, 2021