A microtiter plate transglutaminase assay utilizing 5-(biotinamido)pentylamine as substrate
Transglutaminases belong to an important family of enzymes involved in hemostasis, skin formation, and wound healing. We describe a technique for the measurement of transglutaminase activity using polystyrene microtiter plates coated with N,N′-dimethylcasein. The substrate 5-(biotinamido)pentylamine...
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Veröffentlicht in: | Analytical biochemistry 1992-08, Vol.205 (1), p.166-171 |
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Sprache: | eng |
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Zusammenfassung: | Transglutaminases belong to an important family of enzymes involved in hemostasis, skin formation, and wound healing. We describe a technique for the measurement of transglutaminase activity using polystyrene microtiter plates coated with
N,N′-dimethylcasein. The substrate 5-(biotinamido)pentylamine is convalently incorporated into
N,N′-dimethylcasein by transglutaminase in a calcium-dependent reaction. The biotinylated product is detected by streptavidin-alkaline phosphatase and quantitated by measuring the absorbance at 405 nm following the addition of
p-nitrophenyl phosphate. The assay is sensitive, specific, and linear at plasma factor XIIIa concentrations between 0.08 and 1.25 μg/ml and at purified guinea pig liver transglutaminase concentrations between 0.05 and 0.8 μg/ml. The intra-assay coefficient of variation is less than 8%. The solid-phase assay was used to quantitate the transglutaminase activity in
Escherichia coli extracts expressing recombinant factor XIII A-chains and to analyze factor XIIIa inhibitors. This method will facilitate the analysis of structure-function relationships of the transglutaminases using recombinant DNA methods. Furthermore, screening of natural and synthetic factor XIIIa inhibitors will be expedited by this solid-phase microtiter plate assay. |
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ISSN: | 0003-2697 1096-0309 |
DOI: | 10.1016/0003-2697(92)90594-W |