منابع مشابه
Oxidation of Ascorbic Acid by Enzyme Preparations from Orange
Many of the flavor compounds in citrus fruit are synthesized by oxidation-reduction reactions mediated by enzymes in the fruit. The oxidant in some of these reactions is the coenzyme, NADP. One possible way to regenerate this coenzyme to the active oxidized form is through the enzymic oxidation-reduction reactions involving glutathione and ascorbic acid. A system which degrades ascorbic acid in...
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The activity of the enzyme responsible for the synthesis of cytidine diphosphate diglyceride has been found in the 20,000g pellet of a cauliflower (Brassica oleracea) inflorescence homogenate. Greater enzyme activity was found in the pellet after treatment with 0.02% Triton X-100, or after freezing and thawing. Activity was greater when fluoride was included in the reaction mixture. The enzyme ...
متن کاملBiosynthesis of phosphatidylcholine by enzyme preparations from spinach leaves
The enzymic incorporation of choline-l,2-'C from CDP-choline-1 ,V4C into phosphatidylcholine by spinach leaf preparations was characterized. The enzyme catalyzing the incorporation, choline phosphotransferase, had a pH optimum of about 8.0 and required either Mn2+ or Mg2+ as cofactor. The saturation concentration of Mn2+ was 0.3 mM and that for Mg2+ was 13 mM. The nT, for CDP-choline was 10 p ~...
متن کاملBiosynthesis of phosphatidylcholine by enzyme preparations from spinach leaves.
The enzymic incorporation of choline-1,2-(14)C from CDP-choline-1,2-(14)C into phosphatidylcholine by spinach leaf preparations was characterized. The enzyme catalyzing the incorporation, choline phosphotransferase, had a pH optimum of about 8.0 and required either Mn(2+) or Mg(2+) as cofactor. The saturation concentration of Mn(2+) was 0.3 mm and that for Mg(2+) was 13 mm. The K(m) for CDP-cho...
متن کاملPhosphorolysis of maltose by enzyme preparations from Neisseria meningitidis.
In previous studies on the utilization of maltose and glucose by lfeisseria meningitidis (meningococcus) it has been found that the disaccharide is utilized more rapidly than glucose (1, 2). Phosphate esterification was observed with growing cultures, washed cells, and cell-free extracts of this organism in the presence of maltose but not of glucose (3). The properties of the phosphate ester ap...
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ژورنال
عنوان ژورنال: Journal of Bacteriology
سال: 1945
ISSN: 0021-9193,1098-5530
DOI: 10.1128/jb.49.6.595-602.1945