Complexins: Cytosolic proteins that regulate SNAP receptor function

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Abstract

A family of proteins called complexins was discovered that compete with a-SNAP, but not synaptotagmin, for SNAP receptor binding. Complexins I and II are highly homologous hydrophilic proteins that are tightly conserved, with 100% identity among mouse, rat, and human complexin II. They are enriched in neurons where they colocalize with syntaxin and SNAP-25; in addition, complexin II is expressed ubiquitously at low levels. Complexins bind weakly to syntaxin alone and not at all to synaptobrevin and SNAP-25, but strongly to the SNAP receptor-core complex composed of these three molecules. They compete with a-SNAP for binding to the core complex but not with other interacting molecules, including synaptotagmin I, suggesting that the complexins regulate the sequential interactions of α-SNAP and synaptotagmins with the SNAP receptor during exocytosis. © 1995.

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McMahon, H. T., Missler, M., Li, C., & Südhof, T. C. (1995). Complexins: Cytosolic proteins that regulate SNAP receptor function. Cell, 83(1), 111–119. https://doi.org/10.1016/0092-8674(95)90239-2

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