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JCS ePress online publication date 22 Mar 2005
doi: 10.1242/jcs.02276

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Research Article

Classical protein kinase C(s) regulates targeting of synaptotagmin IX to the endocytic recycling compartment


Yael Haberman, Idit Ziv, Yaara Gorzalczany, Mitsunori Fukuda, and Ronit Sagi-Eisenberg*
* Author for correspondence (e-mail: histol3{at}post.tau.ac.il)

Neuronal and non-neuronal tissues show distinctly different intracellular localization of synaptotagmin (Syt) homologues. Therefore, cell type-specific mechanisms are likely to direct Syt homologues to their final cellular destinations. Syt IX localizes to dense core vesicles in PC12 cells. However, in the rat basophilic leukemia (RBL-2H3) mast cell line, as well as in CHO cells, Syt IX is localized at the endocytic recycling compartment (ERC). We show that targeting of Syt IX to the ERC involves constitutive trafficking to the plasma membrane followed by internalization and transport to the ERC. We further show that internalization from the plasma membrane and delivery to the ERC are dependent on phosphorylation by Ca2+-dependent protein kinase C{alpha} or {beta}. As such, correct targeting of Syt IX is facilitated by the phorbol ester TPA but prevented by the cPKC inhibitor Go 6976.
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