Reference: Finger FP, et al. (1998) Sec3p is a spatial landmark for polarized secretion in budding yeast. Cell 92(4):559-71

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Abstract


Exocytosis in yeast occurs at plasma membrane subdomains whose locations vary with the cell cycle, but the primary protein determinants of these sites are unknown. A functional fusion of Sec3 protein with green fluorescent protein (Sec3-GFP) localizes to the site of polarized exocytosis for each cell-cycle stage, where it colocalizes with Sec4p and Sec8p. Sec3-GFP localization is independent of secretory pathway function, of the actin and septin cytoskeletons, and of the polarity establishment proteins. We propose that Sec3p is a spatial landmark defining sites of exocytosis. Polarized secretion would result from the coupling of actin-dependent vesicle targeting with Sec3p-dependent establishment of the vesicle fusion site.

Reference Type
Journal Article | Research Support, U.S. Gov't, P.H.S.
Authors
Finger FP, Hughes TE, Novick P
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