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Ransnäs LA, Insel PA. Quantitation of the guanine nucleotide binding regulatory protein Gs in S49 cell membranes using antipeptide antibodies to alpha s. J Biol Chem. 1988;263(19):9482-5
Ransnäs, L. A., & Insel, P. A. (1988). Quantitation of the guanine nucleotide binding regulatory protein Gs in S49 cell membranes using antipeptide antibodies to alpha s. The Journal of biological chemistry, 263(19), 9482-5.
Ransnäs, L A, and Insel, P A. "Quantitation of the guanine nucleotide binding regulatory protein Gs in S49 cell membranes using antipeptide antibodies to alpha s." The Journal of biological chemistry vol. 263,19 (1988): 9482-5.
Ransnäs LA, Insel PA. Quantitation of the guanine nucleotide binding regulatory protein Gs in S49 cell membranes using antipeptide antibodies to alpha s. J Biol Chem. 1988 Jul 05;263(19):9482-5. PMID: 2837489.
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Elsevier Science

J Biol Chem. 1988 Jul 05;263(19):9482-5.

Quantitation of the guanine nucleotide binding regulatory protein Gs in S49 cell membranes using antipeptide antibodies to alpha s.

The Journal of biological chemistry

L A Ransnäs, P A Insel

Affiliations

  1. Department of Pharmacology, University of California, San Diego, La Jolla 92093.

PMID: 2837489
Free Article

Abstract

Polyclonal antibodies reactive against the guanine nucleotide binding stimulatory protein, Gs, were affinity-purified from two rabbits immunized with a synthetic peptide corresponding to amino acids 28-42 in the alpha-subunit, alpha s. On immunoblots, these antibodies recognized alpha s, but not alpha-subunits from two other guanine nucleotide binding regulatory proteins, Gi and Go. A competitive enzyme-linked immunosorbent assay was developed in which inhibition of antibody binding to peptide-coated microtiter plates was used to quantitate purified Gs or Gs in cholate extracts of cell membranes. Plasma membranes derived from wild type S49 lymphoma cells contained 18.9 +/- 2.3 pmol/mg of membrane protein of alpha s. The same membranes bound 169 +/- 12 fmol/mg of protein of [125I]iodocyanopindolol to beta-adrenergic receptors, indicating that the amount of Gs is far in excess of the amount of beta-adrenergic receptors. Thus, even if every beta-adrenergic receptor molecule were to activate 10 Gs molecules, in order for Gs to be limiting for the receptors to reach their high affinity state, it is likely that compartmentation exists for target cell membrane receptors and Gs. Moreover, a comparison of beta-adrenergic receptor number and Gs levels in several different S49 lymphoma cell mutants having lesions in receptors or Gs argues against a coordinate regulation of beta-adrenergic receptors and Gs.

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