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Positively charged Nanogold (Nanoprobes, Stony Brook, NY) has been developed as a new marker to follow the endocytic pathway in yeast. Positively charged Nanogold binds extensively to the surface of yeast spheroplasts and is internalized in an energy-dependent manner. Internalization of gold is blocked in the end3 mutant. During a time course of incubation of yeast spheroplasts with positively charged Nanogold at 15 degrees C, the gold was detected sequentially in small vesicles, a peripheral, vesicular/tubular compartment that we designate as an early endosome, a multivesicular body corresponding to the late endosome near the vacuole, and in the vacuole. Experiments examining endocytosis in the sec18 mutant showed an accumulation of positively charged Nanogold in approximately 30-50 nm diameter vesicles. These vesicles most likely represent the primary endocytic vesicles as no other intermediates were detected in the mutant cells, and they correspond in size to the first vesicles detected in wild-type spheroplasts at 15 degrees C. These data lend strong support to the idea that the internalization step of endocytosis in yeast involves formation of small vesicles of uniform size from the plasma membrane.
Authors : Prescianotto-Baschong C , Riezman H ,
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