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The membrane compartments responsible for Golgi functions in wild-type Saccharomyces cerevisiae were identified and characterized by immunoelectron microscopy. Using improved fixation methods, Golgi compartments were identified by labeling with antibodies specific for alpha 1-6 mannose linkages, the Sec7 protein, or the Ypt1 protein. The compartments labeled by each of these antibodies appear as disk-like structures that are apparently surrounded by small vesicles. Yeast Golgi typically are seen as single, isolated cisternae, generally not arranged into parallel stacks. The location of the Golgi structures was monitored by immunoelectron microscopy through the yeast cell cycle. Several Golgi compartments, apparently randomly distributed, were always observed in mother cells. During the initiation of new daughter cells, additional Golgi structures cluster just below the site of bud emergence. These Golgi enter daughter cells at an early stage, raising the possibility that much of the bud's growth might be due to secretory vesicles formed as well as consumed entirely within the daughter. During cytokinesis, the Golgi compartments are concentrated near the site of cell wall synthesis. Clustering of Golgi both at the site of bud formation and at the cell septum suggests that these organelles might be directed toward sites of rapid cell surface growth.

Characterization of the Saccharomyces Golgi complex through the cell cycle by immunoelectron microscopy.