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Related Experiment Videos

Angiotensin II type 1 receptor-function affected by mutations in cytoplasmic loop CD.

S Miura1, J Zhang, S S Karnik

  • 1Department of Molecular Cardiology, Lerner Research Institute, The Cleveland Clinic Foundation, 9500 Euclid Avenue, NB50, Cleveland, OH 44195, USA.

FEBS Letters
|April 4, 2000
PubMed
Summary

Researchers investigated the angiotensin II type 1 (AT(1)) receptor

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Area of Science:

  • Biochemistry and Molecular Biology
  • Receptor Pharmacology
  • G protein-coupled receptor (GPCR) research

Background:

  • The angiotensin II type 1 (AT(1)) receptor mediates cellular responses to angiotensin II.
  • Understanding AT(1) receptor conformational changes is crucial for drug development.
  • Cytoplasmic loops play key roles in GPCR signaling.

Purpose of the Study:

  • To engineer a metal-ion binding site within the AT(1) receptor.
  • To investigate the role of cytoplasmic loops CD and EF in receptor activation.
  • To identify specific residues involved in G(q/11) protein coupling.

Main Methods:

  • Construction of histidine mutant AT(1) receptors (double and triple mutants).
  • Assessment of inositol phosphate (IP) production in response to receptor activation.

Related Experiment Videos

  • Evaluation of the effect of zinc chloride (ZnCl2) on mutant receptor activity.
  • Systematic analysis of single histidine mutants in cytoplasmic loops CD and EF.

    • Main Results:

    • Mutations in cytoplasmic loop CD significantly reduced IP production.
    • Loop CD mutants showed 52-74% inhibition of IP production.
    • Mutations in loop EF did not significantly affect IP production.
    • ZnCl2 inhibition was not significant in double and triple His mutants, but basal IP production was decreased.

    Conclusions:

    • The cytoplasmic loop CD segment (Tyr127-Ile130) is critical for AT(1) receptor-mediated G(q/11) activation.
    • Specific residues within loop CD are essential for efficient signal transduction.
    • This study provides insights into the structural determinants of AT(1) receptor function.