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• W3088132311 abstract "Abstract Enzymes are fundamental to biological processes and involved in most pathologies. Here we demonstrate the concept of simultaneously mapping multiple enzyme activities (EA) by applying enzyme substrate libraries to tissue sections and analyzing their conversion by matrix-assisted laser desorption/ionization (MALDI) imaging mass spectrometry (IMS). To that end, we spray-applied a solution of 20 naturally derived peptides that are known substrates for proteases, kinases, and phosphatases to zinc-fixed paraffin tissue sections of mouse kidneys. After enzyme conversion for 5 to 120 min at 37 °C and matrix application, the tissue sections were imaged by MALDI-IMS. We could image incubation time-dependently 16 of the applied substrates with differing signal intensities and 12 masses of expected products. Utilizing inherent enzyme amplification, EA-IMS can become a powerful tool to locally study multiple, potentially even lowly expressed, enzyme activities, networks, and their pharmaceutical modulation. Differences in the substrate detectability highlight the need for future optimizations." @default.
• W3088132311 created "2020-10-01" @default.
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• W3088132311 date "2020-09-23" @default.
• W3088132311 modified "2023-10-08" @default.
• W3088132311 title "Multiplex enzyme activity imaging by MALDI-IMS of substrate library conversions" @default.
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• W3088132311 doi "https://doi.org/10.1038/s41598-020-72436-2" @default.
• W3088132311 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7511933" @default.
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• W3088132311 hasPublicationYear "2020" @default.
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