Dynamin and beta-arrestin reveal distinct mechanisms for G protein-coupled receptor internalization.

Journal Article (Journal Article)

The process of agonist-promoted internalization (sequestration) of G protein-coupled receptors (GPCRs) is intimately linked to the regulation of GPCR responsiveness. Following agonist-mediated desensitization, sequestration of GPCR is presumably associated with the dephosphorylation and recycling of functional receptors. However, the exact mechanisms responsible for GPCR sequestration, even for the prototypic beta2-adrenergic receptor (beta2AR), have remained controversial. We demonstrate here that dynamin, a GTPase that regulates the formation and internalization of clathrin-coated vesicles, is essential for the agonist-promoted sequestration of the beta2AR, suggesting that the beta2AR internalizes via the clathrin-coated vesicle-mediated endocytic pathway. In contrast, internalization of the angiotensin II type 1A receptor (AT1AR), another typical GPCR, does not require dynamin. In addition, the AT1AR internalizes independent of the function of beta-arrestin, a critical component for beta2AR cellular trafficking, but additional AT1ARs are mobilized to the dynamin-dependent pathway upon overexpression of beta-arrestin. These findings demonstrate that GPCRs can utilize distinct endocytic pathways, distinguishable by dynamin and beta-arrestin, and that beta-arrestins function as adaptor proteins specifically targeting GPCRs for dynamin-dependent endocytosis via clathrin-coated vesicles.

Full Text

Duke Authors

Cited Authors

  • Zhang, J; Ferguson, SS; Barak, LS; Ménard, L; Caron, MG

Published Date

  • August 2, 1996

Published In

Volume / Issue

  • 271 / 31

Start / End Page

  • 18302 - 18305

PubMed ID

  • 8702465

International Standard Serial Number (ISSN)

  • 0021-9258

Digital Object Identifier (DOI)

  • 10.1074/jbc.271.31.18302


  • eng

Conference Location

  • United States