Presence of syntaxin 1A in secretory granules of chromaffin cells and interaction with chromogranins A and B

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Abstract

Syntaxin 1A and synaptotagmin I are key participants of fusion complex formation during exocytotic processes, and syntaxin 1A is known to be present in the plasma membrane. Here, we show the presence of not only synaptotagmin I but also syntaxin 1A in secretory granules of bovine adrenal chromaffin cells by immunogold electron microscopy, and further demonstrate the interaction of these proteins with chromogranins A and B (CGA and CGB), two major proteins of secretory granules. Interaction between chromogranins and the components of fusion complex also suggests active participation of CGA and CGB in fusion complex formation and subsequent exocytosis. © 2004 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.

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Yoo, S. H., You, S. H., & Huh, Y. H. (2005). Presence of syntaxin 1A in secretory granules of chromaffin cells and interaction with chromogranins A and B. FEBS Letters, 579(1), 222–228. https://doi.org/10.1016/j.febslet.2004.11.079

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