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Antigen conformation determines processing requirements for T-cell activation.

H Z Streicher, I J Berkower, M Busch

    Proceedings of the National Academy of Sciences of the United States of America
    |November 1, 1984
    PubMed
    Summary
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    Native myoglobin requires lysosomal processing for T-cell presentation, unlike its denatured or fragmented forms. Unfolding, not just size reduction, is key for antigen processing and presentation.

    Area of Science:

    • Immunology
    • Protein Biochemistry

    Background:

    • T-cell recognition of antigens depends on processing and presentation by antigen-presenting cells.
    • The structural state of an antigen can influence its processing requirements.

    Purpose of the Study:

    • To investigate the differential processing requirements of native, denatured, and fragmented sperm whale myoglobin for T-cell presentation.
    • To determine if antigen unfolding or size reduction is critical for processing.

    Main Methods:

    • Utilized a specific I-Ed-restricted T-cell clone recognizing a myoglobin epitope.
    • Employed lysosomal inhibitors (chloroquine, NH4Cl, monensin, leupeptin) to block antigen processing.
    • Compared presentation of native myoglobin, S-methylmyoglobin, apomyoglobin, and a peptide fragment.

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    Main Results:

    • Lysosomal inhibitors blocked presentation of native myoglobin but not the peptide fragment.
    • Denatured S-methylmyoglobin presentation was not inhibited, similar to the fragment.
    • Apomyoglobin showed intermediate susceptibility to inhibition, suggesting unfolding is critical.

    Conclusions:

    • Native myoglobin requires lysosomal proteolysis for processing, while unfolded or fragmented forms do not.
    • Antigen unfolding, rather than size, is the critical factor for processing requirements.
    • Processing may expose buried sites in native proteins for interaction with antigen-presenting cells.