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J. Bacteriol., Oct 1995, 5622-5627, Vol 177, No. 19
Copyright © 1995, American Society for Microbiology

Catabolite inactivation of the yeast maltose transporter occurs in the vacuole after internalization by endocytosis

E Riballo, M Herweijer, DH Wolf and R Lagunas
Instituto de Investigaciones Biomedicas, Consejo Superior de Investigaciones Cientificas, Madrid, Spain.

The maltose transporter of Saccharomyces cerevisiae is rapidly degraded during fermentation in the absence of a nitrogen source. The location and mechanism of degradation of the transporter have been investigated. Using mutants defective in endocytosis, we have shown that degradation of this transporter requires internalization by endocytosis. In addition, studies of mutants defective in proteasome or vacuolar proteolysis revealed that degradation occurs in the vacuole and is independent of proteasome function. The results also revealed that degradation of the maltose transporter requires Sec18p and raised the question of whether in the absence of Sec18p activity the internalized maltose transporter is recycled back to the plasma membrane.

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