Homogeneous, Nonradioactive, Enzymatic Assay for Plasma Pyridoxal 5-Phosphate
نویسندگان
چکیده
منابع مشابه
Homogeneous, nonradioactive, enzymatic assay for plasma pyridoxal 5-phosphate.
BACKGROUND Pyridoxal 5'-phosphate (PLP) is the biologically active form of vitamin B(6). Clinical studies suggest that low PLP concentrations are an independent risk factor for cardiovascular and other diseases. However, PLP concentrations are not routinely diagnosed because of the lack of a homogeneous, nonradioactive assay. We describe a homogeneous, nonradioactive, enzymatic PLP assay that u...
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An assay for determining the concentration of pyridoxal Y-phosphate in plasma from 0.4 ml whole blood is reported. The assay consists of incubating deproteinized plasma with o-setine apodehydratase from Escherichia cob’ in 0.5 M N-2-hydroxyethylpipetazine-N’-3-propesulfonic acid, pH 7.8, at 37°C for 15 mitt, and then determining the o-serine dehydratase activity of an aliquot of the incubation ...
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1. The a and ,B subforms of aspartate aminotransferase were purified from pig heart. 2. The a subform contained 2mol of pyridoxal 5'-phosphate. The apo-(a subform) could be fully reactived by combination with 2mol of cofactor. 3. The protein fluorescence of the apo(a subform) decreased non-linearly with increase in enzyme activity and concentration of bound cofactor. 4. It is concluded that the...
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ژورنال
عنوان ژورنال: Clinical Chemistry
سال: 2002
ISSN: 0009-9147,1530-8561
DOI: 10.1093/clinchem/48.9.1560