Membrane attachment of recombinant G-protein α-subunits in excess of βγ subunits in a eukaryotic expression system

William F. Simonds, Regina M. Collins, Allen M. Spiegel, Mark R. Brann

Research output: Contribution to journalArticle

15 Scopus citations


Recombinant cDNAs encoding the α-subunits of Gi1, Gi2, Gi3, GO and GS were transfected into COS cells with the pCD-PS mammalian expression vector. Expression of each Gα was verified using subtype-specific peptide antisera on immunoblots. Quantitative immunoblotting of α and β subunits indicated: i) that there was no change in expression of endogenous β subunits, and ii) overexpression of α subunits could achieve a ratio of α:β > 25:1. Despite the excess of α over β, the Gα subunits were found predominantly in the membrane fraction. The results demonstrate that Gα subunits can attach to the membrane independently of βγ subunits.

Original languageEnglish (US)
Pages (from-to)46-53
Number of pages8
JournalBiochemical and Biophysical Research Communications
Issue number1
Publication statusPublished - Oct 16 1989
Externally publishedYes


ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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