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Polypeptide-binding membrane receptors: analysis and classification.

J Kaplan

    Science (New York, N.Y.)
    |April 3, 1981
    PubMed
    Summary
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    Mammalian polypeptide receptors are functionally classified into two types: Class I, altering cell behavior upon ligand binding (e.g., hormones), and Class II, mediating ligand internalization (e.g., LDL receptors). Understanding these receptor behaviors offers insights into cell physiology.

    Area of Science:

    • Cellular biology
    • Molecular biology
    • Biochemistry

    Background:

    • Mammalian plasma membranes host polypeptide receptors crucial for cellular communication.
    • These receptors exhibit diverse chemical structures but share functional similarities.
    • Previous research has identified various receptor types, including hormone, low-density lipoprotein (LDL), and alpha-macroglobulin receptors.

    Purpose of the Study:

    • To categorize mammalian polypeptide receptors based on their distinct functional roles.
    • To elucidate the behavioral patterns of different receptor classes.
    • To provide insights into receptor physiology and enable predictive analysis of receptor characteristics.

    Main Methods:

    • Functional classification of polypeptide receptors on mammalian plasma membranes.

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  • Analysis of ligand-receptor interactions and their downstream cellular effects.
  • Comparative assessment of behavioral patterns across chemically disparate receptors.

    • Main Results:

    • Two primary functional classes of polypeptide receptors were identified: Class I and Class II.
    • Class I receptors mediate ligand binding that directly alters cell metabolism or behavior, exemplified by hormone-receptor interactions.
    • Class II receptors facilitate ligand internalization, with subsequent cellular activity changes dependent on ligand metabolism, as seen with LDL and alpha-macroglobulin receptors.

    Conclusions:

    • Receptor classification based on function provides a framework for understanding receptor physiology.
    • Despite chemical diversity, receptors within each class exhibit conserved behavioral patterns.
    • Analysis of these patterns offers valuable insights for prospective characterization of novel receptor functions.