Bipartite syntaxin 1A interactions mediate CaV2.2 calcium channel regulation

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dc.contributor.authorDavies, Jonathan N.
dc.contributor.authorJarvis, Scott E.
dc.contributor.authorZamponi, Gerald W.
dc.date.accessioned2018-05-30T14:54:49Z
dc.date.available2018-05-30T14:54:49Z
dc.date.issued2011-07-05
dc.description.abstractFunctional interactions between syntaxin 1A and Ca(V)2 calcium channels are critical for fast neurotransmitter release in the mammalian brain, and coexpression of syntaxin 1A with these channels not only regulates channel availability, but also promotes G-protein inhibition. Both the syntaxin 1A C-terminal H3 domain, and N-terminal Ha domain have been shown to interact with the Ca(V)2.2 channel synprint region, suggesting a bipartite model of functional interaction, however the molecular determinants of this interaction have not been closely investigated. We used in vitro binding assays to assess interactions of syntaxin 1A truncation mutants with Ca(V)2.2 synprint and Ca(V)2.3 II-III linker regions. We identified two distinct interactions between the Ca(V)2.2 synprint region and syntaxin 1A: the first between C-terminal H3c domain of syntaxin 1A and residues 822-872 of Ca(V)2.2; and the second between the N-terminal 10 residues of the syntaxin 1A Ha region and residues 718-771 of Ca(V)2.2. The N-terminal syntaxin 1A fragment also interacted with the Ca(V)2.3 II-III linker. We then performed whole cell patch clamp recordings to test the effects of a putative interacting syntaxin 1A N-terminus peptide with Ca(V)2.2 and Ca(V)2.3 channels in a recombinant expression system. A YFP-tagged peptide corresponding to the N-terminal 10 residues of the syntaxin 1A Ha domain was sufficient to allosterically inhibit both Ca(V)2.2 and Ca(V)2.3 channel function but had no effect on G-protein mediated inhibition. Our results support a model of bipartite functional interactions between syntaxin 1A and Ca(V)2.2 channels and add accuracy to the two putative interacting domains, consistent with previous studies. Furthermore, we highlight the syntaxin 1A N-terminus as the minimal determinant for functional regulation of Ca(V)2.2 and Ca(V)2.3 channels.en_US
dc.identifier.citationDavies, J. N., Jarvis, S. E., & Zamponi, G. W. (2011). Bipartite syntaxin 1A interactions mediate CaV2.2 calcium channel regulation. Biochemical and Biophysical Research Communications, 411(3), 562–568. https://doi.org/10.1016/j.bbrc.2011.06.185en_US
dc.identifier.doihttp://dx.doi.org/10.1016/j.bbrc.2011.06.185en_US
dc.identifier.urihttp://hdl.handle.net/1880/106711
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.publisher.departmentPhysiology & Pharmacologyen_US
dc.publisher.facultyCumming School of Medicineen_US
dc.publisher.institutionUniversity of Calgaryen_US
dc.publisher.policyhttps://www.elsevier.com/about/our-business/policies/sharingen_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0en_US
dc.titleBipartite syntaxin 1A interactions mediate CaV2.2 calcium channel regulationen_US
dc.typejournal articleen_US
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