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• W1969015959 endingPage "178" @default.
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• W1969015959 abstract "The use of 4,4-difluoro-5,7-dimethyl-4-bora-3a, 4a-diaza-s-indacene-3-propionic acid (BODIPY-FL) labeled casein in autoquenching assays of proteolytic activity has been recently described, and we have adapted this assay to measurement of calpain activity. BODIPY-FL coupled to casein at a ratio of 8 mol of BODIPY-FL/mol of casein or higher produces a BODIPY-FL-casein substrate that can be used in an autoquenching assay of calpain proteolytic activity. This assay has a number of advantages for measuring calpain activity. (1) The procedure does not require precipitation and removal of undegraded protein, so it is much faster than other procedures that require a precipitation step, and it can be used directly in kinetic assays of proteolytic activity. (2) The BODIPY-FL-casein assay is easily adapted to a microtiter plate format, so it can be used to screen large numbers of samples. (3) Casein is an inexpensive and readily available protein substrate that more closely mimics the natural substrates of endoproteinases, such as the calpains, than synthetic peptide substrates do. Casein has K(m) values for micro- and m-calpain that are similar to those of other substrates such as fodrin or MAP2 that may be natural substrates for the calpains, and there is no reason to believe that calpain hydrolysis of casein is inherently different from hydrolysis of fodrin or MAP2, which are much less accessible as substrates for protease assays. (4) The BODIPY-FL-casein assay is capable of detecting 10 ng ( approximately 5 nM) of calpain and is nearly as sensitive as the most sensitive calpain assay reported thus far. (5) The BODIPY-FL-casein assay is as reproducible as the FITC-casein assay, whose reproducibility is comparable to or better than the reproducibility of other methods used to assay calpain activity. The BODIPY-FL-casein assay is a general assay for proteolytic activity and can be used with any protease that cleaves casein." @default.
• W1969015959 created "2016-06-24" @default.
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• W1969015959 date "2000-03-01" @default.
• W1969015959 modified "2023-10-18" @default.
• W1969015959 title "A BODIPY Fluorescent Microplate Assay for Measuring Activity of Calpains and Other Proteases" @default.
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• W1969015959 doi "https://doi.org/10.1006/abio.1999.4475" @default.
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