Human substance P receptor expressed in Sf9 cells couples with multiple endogenous G proteins.

Journal Article (Journal Article)

To identify the G proteins involved in the function of human substance P receptor (hSPR), the receptor was expressed in Sf9 cells using the baculovirus expression system. Maximal hSPR expression was up to 65 pmol/mg membrane protein. The following data indicated that hSPR in Sf9 membranes is coupled to endogenous G proteins: 1) binding of agonist radioligand [125I]BHSP to the receptor was sensitive to guanine nucleotides; and 2) stimulation of the receptor increased [35S]GTPgammaS binding. The hSPR-associated G proteins were identified by photoaffinity labeling with [alpha-32P]-azidoanilido GTP ([alpha-32P]AAGTP), followed by immunoprecipitation of the labeled G proteins with antibodies specific for various Galpha-subunits. These experiments showed that stimulation of hSPR in Sf9 membranes activated multiple endogenous G proteins including Galpha(o), Galpha(q/11), and Galpha(s). While hSPR's ability to associate with Gq/11 is well-documented, the present study provides the first evidence of hSPR's potential to activate Galpha(o) and Galpha(s).

Full Text

Duke Authors

Cited Authors

  • Nishimura, K; Frederick, J; Kwatra, MM

Published Date

  • January 1998

Published In

Volume / Issue

  • 18 / 1

Start / End Page

  • 51 - 65

PubMed ID

  • 9493567

International Standard Serial Number (ISSN)

  • 1079-9893

Digital Object Identifier (DOI)

  • 10.3109/10799899809039164


  • eng

Conference Location

  • England