Calcium channel function regulated by the SH3-GK module in beta subunits.

Journal Article (Journal Article)

beta subunits of voltage-gated calcium channels (VGCCs) regulate channel trafficking and function, thereby shaping the intensity and duration of intracellular changes in calcium. beta subunits share limited sequence homology with the Src homology 3-guanylate kinase (SH3-GK) module of membrane-associated guanylate kinases (MAGUKs). Here, we show biochemical similarities between beta subunits and MAGUKs, revealing important aspects of beta subunit structure and function. Similar to MAGUKs, an SH3-GK interaction within beta subunits can occur both intramolecularly and intermolecularly. Mutations that disrupt the SH3-GK interaction in beta subunits alter channel inactivation and can inhibit binding between the alpha(1) and beta subunits. Coexpression of beta subunits with complementary mutations in their SH3 and GK domains rescues these deficits through intermolecular beta subunit assembly. In MAGUKs, the SH3-GK module controls protein scaffolding. In beta subunits, this module regulates the inactivation of VGCCs and provides an additional mechanism for tuning calcium responsiveness.

Full Text

Duke Authors

Cited Authors

  • McGee, AW; Nunziato, DA; Maltez, JM; Prehoda, KE; Pitt, GS; Bredt, DS

Published Date

  • April 8, 2004

Published In

Volume / Issue

  • 42 / 1

Start / End Page

  • 89 - 99

PubMed ID

  • 15066267

International Standard Serial Number (ISSN)

  • 0896-6273

Digital Object Identifier (DOI)

  • 10.1016/s0896-6273(04)00149-7


  • eng

Conference Location

  • United States