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Isolation and purification of Rh(E) antigen

C V Abraham, S Bakerman

    Biochimica Et Biophysica Acta
    |January 20, 1976
    PubMed
    Summary

    Researchers isolated the Rh(E) antigen from human red blood cells. This antigen, a cyanophycin granule polypeptide, was named multi-l-arginyl-polyaspartic acid due to its branched structure.

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    Area of Science:

    • Biochemistry
    • Immunology
    • Cell Biology

    Background:

    • The Rh(E) antigen is a significant protein found on human red blood cell membranes.
    • Understanding the structure and composition of red blood cell antigens is crucial for transfusion medicine and immunology.

    Purpose of the Study:

    • To isolate and characterize the Rh(E) antigen from human red blood cell membranes.
    • To determine the structural properties and propose a nomenclature for the isolated polypeptide.

    Main Methods:

    • Solubilization of red cell membranes using ethylenediaminetetraacetic acid and NaCl.
    • Chemical treatment of the polypeptide to cleave carboxyl-terminal amino acids.
    • Separation of arginine from the polypeptide using membrane ultrafilters.

    Main Results:

    • Successful isolation of the Rh(E) antigen from human red blood cell membranes.
    • Identification of a highly branched structure in the cyanophycin granule polypeptide.
    • Proposed nomenclature: multi-l-arginyl-polyaspartic acid, based on its similarity to synthetic multichain polyamino acids.

    Conclusions:

    • The Rh(E) antigen is a cyanophycin granule polypeptide with a unique branched structure.
    • The proposed nomenclature reflects the antigen's composition and structural characteristics.
    • This isolation and characterization contribute to the understanding of red blood cell surface antigens.

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