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Curr Opin Cell Biol. 2009 Aug;21(4):537-42. doi: 10.1016/j.ceb.2009.04.007. Epub 2009 May 25.

The exocyst complex in polarized exocytosis.

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  • 1Department of Biology, University of Pennsylvania, Philadelphia, PA 19104-6018, USA.

Abstract

The exocyst is an octameric protein complex, which mediates the tethering of post-Golgi secretory vesicles to the plasma membrane before exocytic fusion. The exocyst assembles by side-by-side packing of rod-shaped subunits composed of helical bundles. The targeting of secretory vesicles to the plasma membrane involves direct interactions of the exocyst with PI(4,5)P(2). In addition, a number of small GTP-binding proteins interact with components of the exocyst and regulate the assembly, localization, and function of this complex. Here we review the recent advances in the field, focusing on the function of the exocyst in polarized exocytosis.

PMID:
19473826
[PubMed - indexed for MEDLINE]
PMCID:
PMC2725219
Free PMC Article

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