PMID: 11929601Apr 4, 2002Paper

Ubiquitin-independent entry into the yeast recycling pathway

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Linyi Chen, N G Davis

Abstract

The yeast a-factor receptor (Ste3p) is subject to two mechanistically distinct modes of endocytosis: a constitutive, ligand-independent pathway links to vacuolar degradation of the receptor, while a ligand-dependent uptake pathway links primarily to recycling and thus, receptor reutilization. Ste3p ubiquitination triggers its uptake into the constitutive pathway. The present work considers the role of the receptor ubiquitination associated with the Ste3p ligand-dependent endocytosis mechanism. The doa4delta mutation which reduces the cellular availability of ubiquitin blocks the Ste3p constitutive uptake. Uptake into the Ste3p ligand-dependent recycling pathway, however, continues unimpaired. The ubiquitin independence of Ste3p ligand-dependent uptake was further indicated by analysis of receptor mutants having Lys-to-Arg substitutions at all possible ubiquitin acceptor sites. Again, the ligand-induced internalization was unimpaired. Furthermore, no discernible effect was seen on either recycling or on the slow PEP4-dependent turnover of the receptor (for receptor internalized via the ligand-dependent mechanism, trafficking to the vacuole/lysosome is the minor, alternate fate to recycling). However, one striking effect of the L...Continue Reading

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