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Science 28 August 1992:
Vol. 257. no. 5074, pp. 1271 - 1273
DOI: 10.1126/science.1519064
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Articles

Science, Vol 257, Issue 5074, 1271-1273
Copyright © 1992 by American Association for the Advancement of Science

articles

SV2, a brain synaptic vesicle protein homologous to bacterial transporters

SM Bajjalieh, K Peterson, R Shinghal, and RH Scheller

Howard Hughes Medical Institute, Stanford University, CA 94305.

Synaptic vesicle protein 2 (SV2) is a membrane glycoprotein specifically localized to secretory vesicles in neurons and endocrine cells. As a first step toward understanding the function of SV2 in neural secretion, a rat brain complementary DNA (cDNA) that encodes SV2 was isolated and characterized. Analyses of this cDNA predict that SV2 contains 12 transmembrane domains. The NH2-terminal half of the protein shows significant amino acid sequence identity to a family of bacterial proteins that transport sugars, citrate, and drugs. Expression of the SV2 cDNA in COS cells yielded a high level of SV2-like immunoreactivity distributed in a reticular and punctate pattern, which suggests localization to intracellular membranes. Its localization to vesicles, predicted membrane topology, and sequence identity to known transporters suggest that SV2 is a synaptic vesicle-specific transporter.


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Phosphorylation of Synaptic Vesicle Protein 2 Modulates Binding to Synaptotagmin.
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