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• W2783444198 abstract "Recently we established a novel affinity purification method for calpain by exploiting the specific and reversible binding properties of its intrinsically disordered protein inhibitor, calpastatin. The immobilization strategy relied on the strength and specificity of the biotin - streptavidin interaction. Here, we report an improved and optimized method that even enables the general applicability of in vivo biotinylated (intrinsically disordered) proteins in any affinity capture strategy. Since in vitro chemical biotinylation is only accomplished with reagents that lack exact site specificity, it can not only cause sample heterogeneity but it can also hamper the functionality of the biotinylated molecules. Therefore, we have developed a recombinant expression protocol to produce in vivo biotinylated human calpastatin domain 1 (hCSD1) in Escherichia coli. We have experimentally verified that the biotinylated polypeptide tag is compatible with the intrinsically disordered state of hCSD1 and that it does not influence the functional properties of this intrinsically disordered protein (IDP). The in vivo biotinylated hCSD1 was then used without the need of any prepurification step prior to the affinity capturing of its substrate, human m-calpain. This leads to a simplified purification strategy that allows capturing the calpain efficiently from a complex biological mixture with only a single chromatogaphic step and in a considerably reduced timeframe. Our approach is generally applicable through the in vivo biotinylation of any IDP of interest, and its practical implementation will showcase the power to exploit the properties of IDPs in affinity capture strategies." @default.
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• W2783444198 date "2018-05-01" @default.
• W2783444198 modified "2023-10-08" @default.
• W2783444198 title "In vivo biotinylated calpastatin improves the affinity purification of human m-calpain" @default.
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• W2783444198 doi "https://doi.org/10.1016/j.pep.2018.01.002" @default.
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