Journal
NATURE NEUROSCIENCE
Volume 12, Issue 3, Pages 277-285Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nn.2266
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Funding
- Wellcome Trust Programme Grant
- MRC Molecular Biology Programme studentship
- Royal Society-Wolfson Research Award
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Although the properties and trafficking of AMPA-type glutamate receptors (AMPARs) depend critically on associated transmembrane AMPAR regulatory proteins (TARPs) such as stargazin (gamma-2), no TARP has been described that can specifically regulate the important class of calcium-permeable (CP-)AMPARs. We examined the stargazin-related protein gamma-5, which is highly expressed in Bergmann glia, a cell type possessing only CP- AMPARs. gamma-5 was previously thought not to be a TARP, and it has been widely used as a negative control. Here we find that, contrary to expectation, gamma-5 acts as a TARP and serves this role in Bergmann glia. Whereas gamma-5 interacts with all AMPAR subunits, and modifies their behavior to varying extents, its main effect is to regulate the function of AMPAR subunit combinations that lack short-form subunits, which constitute predominantly CP-AMPARs. Our results suggest an important role for gamma-5 in regulating the functional contribution of CP- AMPARs.
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