Reconstitution of constitutive secretion using semi-intact cells: regulation by GTP but not calcium

doi:10.1083/jcb.112.1.39

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Reconstitution of constitutive secretion using semi-intact cells: regulation by GTP but not calcium

SG Miller and HP Moore
Department of Molecular and Cell Biology, University of California, Berkeley 94720.

Regulated exocytosis in many permeabilized cells can be triggered by calcium and nonhydrolyzable GTP analogues. Here we examine the role of these effectors in exocytosis of constitutive vesicles using a system that reconstitutes transport between the trans-Golgi region and the plasma membrane. Transport is assayed by two independent methods: the movement of a transmembrane glycoprotein (vesicular stomatitis virus glycoprotein [VSV G protein]) to the cell surface; and the release of a soluble marker, sulfated glycosaminoglycan (GAG) chains, that have been synthesized and radiolabeled in the trans-Golgi. The plasma membrane of CHO cells was selectively perforated with the bacterial cytolysin streptolysin-O. These perforated cells allow exchange of ions and cytosolic proteins but retain intracellular organelles and transport vesicles. Incubation of the semi-intact cells with ATP and a cytosolic fraction results in transport of VSV G protein and GAG chains to the cell surface. The transport reaction is temperature dependent, requires hydrolyzable ATP, and is inhibited by N-ethylmaleimide. Nonhydrolyzable GTP analogs such as GTP gamma S, which stimulate the fusion of regulated secretory granules, completely abolish constitutive secretion. The rate and extent of constitutive transport between the trans-Golgi and the plasma membrane is independent of free Ca2+ concentrations. This is in marked contrast to fusion of regulated secretory granules with the plasma membrane, and transport between the ER and the cis-Golgi (Beckers, C. J. M., and W. E. Balch. 1989. J. Cell Biol. 108:1245-1256; Baker, D., L. Wuestehube, R. Schekman, and D. Botstein. 1990. Proc. Natl. Acad. Sci. USA. 87:355-359).
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