A sensitive microplate assay for the detection of proteolytic enzymes using radiolabeled gelatin
โ Scribed by B.D. Robertson; G.E. Kwan-Lim; R.M. Maizels
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 365 KB
- Volume
- 172
- Category
- Article
- ISSN
- 0003-2697
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โฆ Synopsis
A sensitive, microplate assay is described for the detection of a wide range of proteolytic enzymes, using radio-iodine-labeled gelatin as substrate. The technique uses the Bolton-Hunter reagent to label the substrate, which is then coated onto the wells of polyvinyl chloride microtiter plates. By measuring the radioactivity released the assay is able to detect elastase, trypsin, and collagenase in concentrations of 1 ng/ml or less, while the microtiter format permits multiple sample handling and minimizes sample volumes required for analysis.
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Insoluble dye-protein complexes offer many advantages when used as substrates for proteolytie enzymes. The proteolytic split products can be separated from the starting substrat.e conveniently by filtration, and the concentration of the soluble colored products of hydrolysis can easily be measured a
The cysteine endopeptidase legumain was recently discovered in mammalian cells, predominantly localized in the lysosomal system where it is believed to contribute to antigen processing for MHC class II. Here we describe rapid assay procedures for the enzyme in 96-well microplates with two substrates