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Phosphatidylinositol transfer protein required for ATP-dependent priming of Ca2+-activated secretion

Nature volume 366, pages 572–575 (1993)Cite this article

Abstract

ELUCIDATION of the reactions responsible for the calcium-regulated fusion of secretory granules with the plasma membrane in secretory cells would be facilitated by the identification of participant proteins having known biochemical activities. The successful characterization of cytosolic1–3 and vesicle4,5 proteins that may function in calcium-regulated secretion has not yet revealed the molecular events underlying this process. Regulated secretion consists of sequential priming and triggering steps which depend on ATP and Ca2+, respectively, and require distinct cytosolic proteins6. Characterization of priming-specific factors (PEP proteins) should enable the ATP-requiring reactions to be identified. Here we show that one of the mammalian priming factors (PEP3) is identical to phosphatidylinositol transfer protein (PITP)7. The physiological role of PITP was previously unknown. We also find that SEC14p, the yeast phosphatidylinositol transfer protein which is essential for constitutive secretion8–10, can substitute for PEP3/PITP in priming. Our results indicate that a role for phospholipid transfer proteins is conserved in the constitutive and regulated secretory pathways.

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Authors and Affiliations

  1. Program in Cell and Molecular Biology, University of Wisconsin, 1117 W. Johnson Street, Madison, Wisconsin, 53706

    Jesse C. Hay

  2. Department of Zoology, University of Wisconsin, 1117 W. Johnson Street, Madison, Wisconsin, 53706

    Thomas F. J. Martin

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  1. Jesse C. Hay
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  2. Thomas F. J. Martin
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Hay, J., Martin, T. Phosphatidylinositol transfer protein required for ATP-dependent priming of Ca2+-activated secretion. Nature 366, 572–575 (1993). https://doi.org/10.1038/366572a0

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