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Membrane fractions from bean hypocotyl or suspension cultures incorporated arabinose from UDP-beta-L-arabinose into arabinan and xylose from UDP-alpha-D-xylose in vitro; the level of each activity was dependent on the state of differentiation of the cells. These activities may be due to single transglycosylases, since no lipid or proteinaceous intermediate acceptors were found in either case. Subcellular fractionation studies showed that enzyme activity in vitro was localized in both Golgi-derived membranes and endoplasmic reticulum in similar amounts. However, incorporation into the polymers in vivo in suspension culture cells incubated with [1-3H]arabinose was considerably greater in the Golgi-derived membranes. Thus, although these enzymes may be translated and inserted at the level of the endoplasmic reticulum, their activities are under other levels of control, so that most of the activity in vivo is confined to the Golgi apparatus. Initiation of glycosylation in the endoplasmic activity may, however, occur.

Arabinan synthase and xylan synthase activities of Phaseolus vulgaris. Subcellular localization and possible mechanism of action