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Alpha 1-adrenergic receptor structure.

J C Venter, P Horne, B Eddy

    Molecular Pharmacology
    |September 1, 1984
    PubMed
    Summary
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    The alpha 1-adrenergic receptor, identified as an 85 kDa polypeptide, likely functions as a 160 kDa dimer in cell membranes. This dimeric structure, revealed by target size analysis, suggests a functional extracellular ligand-binding domain.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Pharmacology

    Background:

    • The alpha 1-adrenergic receptor plays a crucial role in cellular signaling pathways.
    • Understanding the structural organization of membrane-bound receptors is essential for elucidating their function.

    Purpose of the Study:

    • To investigate the molecular structure of the alpha 1-adrenergic receptor.
    • To determine the quaternary structure of the intact membrane-bound receptor.

    Main Methods:

    • Sodium dodecyl sulfate (NaDodSO4)-polyacrylamide gel electrophoresis was used to analyze receptor polypeptides.
    • Affinity labeling with [3H]phenoxybenzamine identified specific receptor subunits.
    • Target size analysis (radiation inactivation) determined the molecular mass of the intact membrane-bound receptor.

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    Main Results:

    • The alpha 1-adrenergic receptor appeared as an 85,000 Da polypeptide on NaDodSO4 gels.
    • Target size analysis indicated an intact membrane-bound receptor molecular mass of 160,000 Da.
    • Limited proteolysis revealed a 45,000 Da water-soluble peptide containing the ligand-binding domain.

    Conclusions:

    • The alpha 1-adrenergic receptor likely exists as a dimer of two 85,000 Da subunits in the cell membrane.
    • The ligand-binding domain is located on a portion of the receptor that extends into the extracellular space.