Abstract
A particulate enzyme preparation, isolated from in vitro cultivated Lilium testaceum bulbs, was shown to catalyse the biosynthesis of a water-soluble β-1,4-glucomannan with a M r of 20 000. GDP[ 14C] mannose and GDP[ 14C] glucose were used as substrates for glucomannan biosynthesis. The incorporation of[ 14C] mannose and/or [ 14C] glucose into the polymer was significantly stimulated by low M r glucomannan (3500). The isolated membrane preparation also exhibited GDP-mannose/-glucose-epimerase activity.
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