title: Subcellular localization and functional expression of the glycerol uptake protein 1 (GUP1) of Saccharomyces cerevisiae tagged with green fluorescent protein.
abstract: GFP (green fluorescent protein) from Aequorea victoria was used as an in vivo reporter protein when fused to the N- and C-termini of the glycerol uptake protein 1 (Gup1p) of Saccharomyces cerevisiae. The subcellular localization and functional expression of biologically active Gup1-GFP chimaeras was monitored by confocal laser scanning and electron microscopy, thus supplying the first study of GUP1 dynamics in live yeast cells. The Gup1p tagged with GFP is a functional glycerol transporter localized at the plasma membrane and endoplasmic reticulum levels of induced cells. The factors involved in proper localization and turnover of Gup1p were revealed by expression of the Gup1p-GFP fusion protein in a set of strains bearing mutations in specific steps of the secretory and endocytic pathways. The chimaerical protein was targeted to the plasma membrane through a Sec6-dependent process; on treatment with glucose, it was endocytosed through END3 and targeted for degradation in the vacuole. Gup1p belongs to the list of yeast proteins rapidly down-regulated by changing the carbon source in the culture medium, in agreement with the concept that post-translational modifications triggered by glucose affect proteins of peripheral functions. The immunoelectron microscopy assays of cells expressing either Gup1-GFP or GFP-Gup1 fusions suggested the Gup1p membrane topology: the N-terminus lies in the periplasmic space, whereas its C-terminal tail has an intracellular location. An extra cytosolic location of the N-terminal tail is not generally predicted or determined in yeast membrane transporters.
authors.affiliation: Istituto di Scienze delle Produzioni Alimentari Sezione di Lecce, CNR, 73100 Lecce, Italy.
authors.forename: Gianluca
authors.initials: G
authors.lastname: Bleve
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Zacheo
authors.forename: Maria Stella
authors.initials: MS
authors.lastname: Cappello
authors.forename: Franco
authors.initials: F
authors.lastname: Dellaglio
authors.forename: Francesco
authors.initials: F
authors.lastname: Grieco
mesh_terms: D002352:Carrier Proteins / Q000737:chemistry* / Q000378:metabolism*; D002462:Cell Membrane / Q000502:physiology; D004721:Endoplasmic Reticulum / Q000502:physiology; D015966:Gene Expression Regulation, Fungal / Q000502:physiology; D049452:Green Fluorescent Proteins / Q000737:chemistry*; D008565:Membrane Proteins / Q000737:chemistry* / Q000378:metabolism*; D026901:Membrane Transport Proteins / Q000737:chemistry* / Q000378:metabolism*; D009154:Mutation; D011994:Recombinant Proteins; D012441:Saccharomyces cerevisiae / Q000166:cytology / Q000235:genetics / Q000502:physiology*; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry* / Q000378:metabolism*
chemical_list: D002352:Carrier Proteins; C499609:GUP2 protein, S cerevisiae; C414103:Gup1 protein, S cerevisiae; D008565:Membrane Proteins; D026901:Membrane Transport Proteins; D011994:Recombinant Proteins; D029701:Saccharomyces cerevisiae Proteins; C485192:green fluorescent protein, Aequorea victoria; D049452:Green Fluorescent Proteins