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The solubilization of a glucuronyltransferase involved in pea pisum sativum cultivar alaska glucuronoxylan synthesis



The solubilization of a glucuronyltransferase involved in pea pisum sativum cultivar alaska glucuronoxylan synthesis



Biochemical Journal 264(3): 643-650



A glucuronyltransferase involved in glucuronoxylan biosynthesis was obtained from the epicotyls of 1-week-old etiolated pea (Pisum sativum var. Alaska) seedlings and was solubilized in Triton X-100, a non-ionic detergent. The enzyme was inactivated by SDS and inhibited by Derriphat 160 and cholic acid. The enzyme was active in the presence of NN-dimethyldodecylanium-N-oxide, but was not solubilized by it. The stimulatory effect of UDP-D-xylose on the particulate and solubilized enzymes was the same, but the optimum Mn2+ concentration was lower for the solubilized enzyme, and the product formed by the solubilized enzyme has altered structure and solubility properties. Gel filtration of the solubilized enzyme on Sepharose CL-6B permitted partial separation of the stimulatory effect of UDP-D-xylose from the activity in the absence of UDP-D-xylose. The solubilized enzyme was more stable than the particulate enzyme and could be stored for 2 weeks at -20.degree.C without loss of activity.

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Accession: 007936178

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