Browsing by Person "Brill, Aya"

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Stable isotope analysis confirms substantial changes in the fatty acid composition of bacteria treated with antimicrobial random peptide mixtures (RPMs)
(2022) Wiedmaier-Czerny, Nina; Schroth, Dorothee; Krauß, Stephanie; Topman-Rakover, Shiri; Brill, Aya; Burdman, Saul; Hayouka, Zvi; Vetter, Walter; Wiedmaier-Czerny, Nina; Department of Food Chemistry (170B), Institute of Food Chemistry, University of Hohenheim, Stuttgart, Germany; Schroth, Dorothee; Department of Food Chemistry (170B), Institute of Food Chemistry, University of Hohenheim, Stuttgart, Germany; Krauß, Stephanie; Department of Food Chemistry (170B), Institute of Food Chemistry, University of Hohenheim, Stuttgart, Germany; Topman-Rakover, Shiri; Department of Plant Pathology and Microbiology, Institute of Environmental Sciences, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel; Brill, Aya; Department of Plant Pathology and Microbiology, Institute of Environmental Sciences, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel; Burdman, Saul; Department of Plant Pathology and Microbiology, Institute of Environmental Sciences, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel; Hayouka, Zvi; Institute of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel; Vetter, Walter; Department of Food Chemistry (170B), Institute of Food Chemistry, University of Hohenheim, Stuttgart, Germany
Resistance of plant-pathogenic bacteria to classic antibiotics has prompted the search for suitable alternative antimicrobial substances. One promising strategy could be the use of purposely synthesized random peptide mixtures (RPMs). Six plant-pathogenic bacteria were cultivated and treated with two RPMs previously found to show antimicrobial activity mainly by bacterial membrane disruption. Here, we show that bacteria treated with RPMs showed partly remarkable changes in the fatty acid pattern while those unaffected did not. Quantitative changes could be verified by compound specific isotope analysis of δ 13 C values (‰). This technique was employed due to the characteristic feature of stronger bonds between heavier isotopes in (bio)chemical reactions. As a proof of concept, the increase in abundance of a fatty acid group after RPM treatment was accompanied with a decrease in the 13 C content and vice versa. We propose that our findings will help designing and synthesizing more selective antimicrobial peptides.