Selective regulation of long-form calcium-permeable AMPA receptors by an atypical TARP, gamma-5.

Although the properties and trafficking of AMPA-type glutamate receptors (AMPARs) depend critically on associated transmembrane AMPAR regulatory proteins such as stargazin (gamma-2), no 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 and it has been widely used as a negative control. Here we find that, contrary to expectation, gamma-5 acts as a Tduanyu37 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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