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Regions of the alpha 1-adrenergic receptor involved in coupling to phosphatidylinositol hydrolysis and enhanced sensitivity of biological function.

Publication ,  Journal Article
Cotecchia, S; Exum, S; Caron, MG; Lefkowitz, RJ
Published in: Proc Natl Acad Sci U S A
April 1990

Regions of the hamster alpha 1-adrenergic receptor (alpha 1 AR) that are important in GTP-binding protein (G protein)-mediated activation of phospholipase C were determined by studying the biological functions of mutant receptors constructed by recombinant DNA techniques. A chimeric receptor consisting of the beta 2-adrenergic receptor (beta 2AR) into which the putative third cytoplasmic loop of the alpha 1AR had been placed activated phosphatidylinositol metabolism as effectively as the native alpha 1AR, as did a truncated alpha 1AR lacking the last 47 residues in its cytoplasmic tail. Substitutions of beta 2AR amino acid sequence in the intermediate portions of the third cytoplasmic loop of the alpha 1AR or at the N-terminal portion of the cytoplasmic tail caused marked decreases in receptor coupling to phospholipase C. Conservative substitutions of two residues in the C terminus of the third cytoplasmic loop (Ala293----Leu, Lys290----His) increased the potency of agonists for stimulating phosphatidylinositol metabolism by up to 2 orders of magnitude. These data indicate (i) that the regions of the alpha 1AR that determine coupling to phosphatidylinositol metabolism are similar to those previously shown to be involved in coupling of beta 2AR to adenylate cyclase stimulation and (ii) that point mutations of a G-protein-coupled receptor can cause remarkable increases in sensitivity of biological response.

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Published In

Proc Natl Acad Sci U S A

DOI

ISSN

0027-8424

Publication Date

April 1990

Volume

87

Issue

8

Start / End Page

2896 / 2900

Location

United States

Related Subject Headings

  • Receptors, Adrenergic, alpha
  • Protein Conformation
  • Plasmids
  • Phosphatidylinositols
  • Norepinephrine
  • Molecular Sequence Data
  • Ligands
  • Kinetics
  • Inositol Phosphates
  • Inositol
 

Citation

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Cotecchia, S., Exum, S., Caron, M. G., & Lefkowitz, R. J. (1990). Regions of the alpha 1-adrenergic receptor involved in coupling to phosphatidylinositol hydrolysis and enhanced sensitivity of biological function. Proc Natl Acad Sci U S A, 87(8), 2896–2900. https://doi.org/10.1073/pnas.87.8.2896
Cotecchia, S., S. Exum, M. G. Caron, and R. J. Lefkowitz. “Regions of the alpha 1-adrenergic receptor involved in coupling to phosphatidylinositol hydrolysis and enhanced sensitivity of biological function.Proc Natl Acad Sci U S A 87, no. 8 (April 1990): 2896–2900. https://doi.org/10.1073/pnas.87.8.2896.
Cotecchia S, Exum S, Caron MG, Lefkowitz RJ. Regions of the alpha 1-adrenergic receptor involved in coupling to phosphatidylinositol hydrolysis and enhanced sensitivity of biological function. Proc Natl Acad Sci U S A. 1990 Apr;87(8):2896–900.
Cotecchia, S., et al. “Regions of the alpha 1-adrenergic receptor involved in coupling to phosphatidylinositol hydrolysis and enhanced sensitivity of biological function.Proc Natl Acad Sci U S A, vol. 87, no. 8, Apr. 1990, pp. 2896–900. Pubmed, doi:10.1073/pnas.87.8.2896.
Cotecchia S, Exum S, Caron MG, Lefkowitz RJ. Regions of the alpha 1-adrenergic receptor involved in coupling to phosphatidylinositol hydrolysis and enhanced sensitivity of biological function. Proc Natl Acad Sci U S A. 1990 Apr;87(8):2896–2900.
Journal cover image

Published In

Proc Natl Acad Sci U S A

DOI

ISSN

0027-8424

Publication Date

April 1990

Volume

87

Issue

8

Start / End Page

2896 / 2900

Location

United States

Related Subject Headings

  • Receptors, Adrenergic, alpha
  • Protein Conformation
  • Plasmids
  • Phosphatidylinositols
  • Norepinephrine
  • Molecular Sequence Data
  • Ligands
  • Kinetics
  • Inositol Phosphates
  • Inositol