Abstract
There are two main pathways of vesicular protein traffic and secretion in eukaryotic cells. One, common to all cells, is constitutive. The other, termed regulated, is present in specialized cell types and serves to rapidly export selected proteins under controlled conditions (Burgess and Kelly 1987). During transit towards the cell surface, all secretory proteins share a number of constitutive vesicular transport steps through the endoplasmic reticulum (ER) and the Golgi compartments. Their fates then diverge in the tract from the trans Golgi network (TGN) to the plasma membrane in two major respects. Proteins secreted by the regulated pathway are sorted, concentrated, and stored for variable periods of time in rather large specialized structures, the secretory granules. By contrast, constitutively secreted proteins are enclosed in small vesicles (50–60 nm in diameter), similar to those used in intra-Golgi transport, and flowing continuously towards the plasma membrane where they fuse. The second difference is that exocytosis of regulated granules occurs only upon triggering by an appropriate extracellular signal, whereas all other transport steps proceed continuously and, in fact, constitutively.
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Luini, A., De Matteis, M.A. (1993). Regulated Exocytosis and Interorganelle Vesicular Traffic: A Comparative Analysis. In: Dickey, B.F., Birnbaumer, L. (eds) GTPases in Biology I. Handbook of Experimental Pharmacology, vol 108 / 1. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-78267-1_32
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