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  • Title: STE6, the yeast a-factor transporter.
    Author: Michaelis S.
    Journal: Semin Cell Biol; 1993 Feb; 4(1):17-27. PubMed ID: 8095825.
    Abstract:
    In eukaryotic cells, most extracellular proteins exit the cell via the classical secretory pathway (ER-->Golgi-->secretory vesicles). A notable exception to this pattern is the Saccharomyces cerevisiae mating pheromone alpha-factor, an isoprenylated, methylated, oligopeptide signaling molecule which uses a distinctly non-classical mechanism for secretion. Export of alpha-factor from the yeast cell is mediated by STE6, a member of the ABC protein superfamily. STE6 is one of the few eukaryotic ABC proteins for which a true physiological substrate is known. The ability to carry out molecular manipulations with ease in yeast, together with the possibility of probing substrate-transporter interactions via genetic analysis, affords an excellent opportunity to rigorously dissect the workings of this ABC family member.
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