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. 1979 Feb;76(2):791–795. doi: 10.1073/pnas.76.2.791

Evidence for role of glycoprotein carbohydrates in membrane transport: specific inhibition by tunicamycin.

K Olden, R M Pratt, C Jaworski, K M Yamada
PMCID: PMC383052  PMID: 218220

Abstract

Using tunicamycin, we have investigated the role of glycoproteins in membrane transport. Tunicamycin is a glucosamine-containing antibiotic that specifically inhibits dolichol pyrophosphate-mediated glycosylation of asparaginyl residues of glycoproteins. Inhibition of protein glycosylation in chick embryo fibroblasts by tunicamycin or other inhibitors of glycosylation resulted in defective transport of glucose, uridine, and amino acid analogs (alpha-aminoisobutyrate and cycloleucine). The defect in glucose transport is accompanied by decreased glucose metabolism, as determined by rates of CO2 and lactate production. In contrast, tunicamycin treatment did not affect other membrane-associated processes, such as secretion of fibronectin and procollagen, uptake of glucose by passive diffusion, Na+/K+ ATPase and adenylate cyclase activities, or stimulation of adenylate cyclase by prostaglandin and cholera toxin. Two glucose/glycosylation-regulated membrane proteins with apparent subunit molecular weights of 95,000 and 75,000 were induced by tunicamycin treatment. Our results indicate that glycoprotein glycosylation is required for membrane transport.

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Selected References

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