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Evidence That the Lipid Carrier for N-Acetylglucosamine Is Different from That for Mannose in Mung Beans and Cotton Fibers ¹

Department of Biochemistry, The University of Texas Health Science Center, San Antonio, Texas 78284

Cell-free enzyme particles from mung beans (Phaseolus aureus) or cotton (Gossypium hirsutum L.) fibers catalyze the incorporation of mannose from GDP-[¹⁴C]mannose and N-acetylglucosamine from UDP-[³H]-N-acetylglucosamine into polyprenyl-type lipids. These lipids have been synthesized and purified and the lipid moieties compared to each other as well as to dolichyl phosphate and to lipids isolated from similar mannoseand N-acetylglucosamine-containing lipids from liver and aorta.

The following lines of evidence indicate that in plants, the lipid carrier for N-acetylglucosamine is different from the lipid carrier for mannose: [List: see text]

We propose that the apparent difference in the lipid carrier for these two sugars may be a point of control of glycoprotein synthesis.