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. 1989 Feb 1;257(3):853-8.
doi: 10.1042/bj2570853.

The interaction of xylosyltransferase and glucuronyltransferase involved in glucuronoxylan synthesis in pea (Pisum sativum) epicotyls

E A Baydoun  1 , K W Waldron, C T Brett
Affiliations

The interaction of xylosyltransferase and glucuronyltransferase involved in glucuronoxylan synthesis in pea (Pisum sativum) epicotyls

E A Baydoun et al. Biochem J. .

Abstract

A particulate enzyme preparation from etiolated pea (Pisum sativum) epicotyls was found to incorporate xylose from UDP-D-xylose into beta-(1----4)-xylan. The ability of this xylan to act as an acceptor for incorporation of [14C]glucuronic acid from UDP-D-[14C]glucuronic acid in a subsequent incubation was very limited, even though glucuronic acid incorporation was greatly prolonged when UDP-D-xylose was present in the same incubation as UDP-D-[14C]glucuronic acid. This indicated that glucuronic acid could not be added to preformed xylan. However, the presence of UDP-D-glucuronic acid inhibited incorporation of [14C]xylose from UDP-D-[14C]xylose into beta-(1----4)-xylan, and neither S-adenosylmethionine nor acetyl-CoA stimulated either the xylosyltransferase or the glucuronyltransferase.

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