Abstract
Protease inhibitors of the cystatin protein superfamily show potential in plant protection for the control of herbivorous pests. Here, we describe a cystatin activity–based profiling procedure for the selection of potent cystatin candidates, using single functional variants of tomato cystatin SlCYS8 and digestive Cys proteases of the herbivore insect Colorado potato beetle as a case study. The procedure involves the capture of target Cys proteases with biotinylated versions of the cystatins, followed by the identification and quantitation of captured proteases by mass spectrometry. An example is given to illustrate usefulness of the approach as an alternative to current procedures for recombinant inhibitor selection based on in vitro assays with synthetic peptide substrates. A second example is given showing its usefulness as a tool to compare the affinity spectra of inhibitor variants toward different subsets of target protease complements.
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Acknowledgments
Work supported by Discovery and Discovery Accelerator Supplement grants from the Natural Science and Engineering Research Council of Canada to D.M.
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Goulet, MC., Sainsbury, F., Michaud, D. (2020). Cystatin Activity–Based Protease Profiling to Select Protease Inhibitors Useful in Plant Protection. In: Jorrin-Novo, J., Valledor, L., Castillejo, M., Rey, MD. (eds) Plant Proteomics. Methods in Molecular Biology, vol 2139. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-0528-8_26
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DOI: https://doi.org/10.1007/978-1-0716-0528-8_26
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