A procedure is described for assaying fumarate hydratase by coupling malate formed from fumarate to NADP+ reduction via NADP malic enzyme. The procedure is much more sensitive than existing assay methods and circumvents problems particularly associated with the use of these methods for determining f
An assay for PEP carboxykinase in crude tissue extracts
โ Scribed by M.D. Hatch
- Publisher
- Elsevier Science
- Year
- 1973
- Tongue
- English
- Weight
- 339 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0003-2697
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โฆ Synopsis
A simple procedure is described for assaying phosphoenolpyruvate carboxykinase in the direction of oxaloacetate decarboxylation by following the decrease in oxaloacetate absorbance. The procedure offers a means of measuring the activity of this enzyme in its physiological direction in unfractionated tissue extracts. Phosphoenolpyruvate (PEP) carboxykinase catalyses the following reversible reaction: 289
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## Methods Reagents. Bz-Arg-NPhNO, was obtained from Seikagaku Kogyo Co., Ltd. Phenylmethylsulfonyl fluoride was purchased from Sigma. All other chemicals were reagent grade and commercially available. p-Dimethylaminobenzaldehyde reagent was prepared as follows: Concentrated sulfuric acid, 2.74 ml
Despite the physiological importance of serine/threonine protein phosphatase type 2B (PP2B/calcineurin), an accurate assay method of PP2B in crude tissue extracts has not been established. By using recombinant protein phosphatase inhibitor-1 as a substrate and ascorbic acid as an antioxidant, we dev