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Chemical modification of mouse interferons.

M Rusckowski, M Paucker, B Dalton

    Journal of Interferon Research
    |January 1, 1982
    PubMed
    Summary
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    Chemical modification of mouse interferons (MuIFN) revealed distinct amino acid residue roles. Lysine modification inactivated both MuIFN-alpha and MuIFN-beta, while cysteine and tryptophan modifications differentiated the two species.

    Area of Science:

    • Immunology
    • Biochemistry
    • Molecular Biology

    Background:

    • Mouse interferons (MuIFN) are crucial antiviral proteins.
    • Understanding the structural basis of MuIFN-alpha and MuIFN-beta activity is essential for their therapeutic applications.

    Purpose of the Study:

    • To investigate the role of specific amino acid residues (lysine, cysteine, tryptophan) in the biologic and antigenic properties of MuIFN-alpha and MuIFN-beta.
    • To determine if chemical modification can differentiate between MuIFN-alpha and MuIFN-beta.

    Main Methods:

    • Treatment of MuIFN preparations with chemical modifying reagents specific for lysine, cysteine, and tryptophan residues.
    • Characterization of modified MuIFN species by antiviral activity assays on homologous and heterologous cells.
    • Assessment of antibody neutralization to evaluate antigenic properties.

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    Main Results:

    • Modification of lysine residues with fluorescamine inactivated both MuIFN-alpha and MuIFN-beta, suggesting their involvement in both biologic and antigenic functions.
    • Modification of cysteine residues with 5,5'-dithio-bis (2-nitrobenzoic acid) enhanced MuIFN-alpha antiviral activity but decreased MuIFN-beta activity.
    • Modification of tryptophan residues with 2-methoxy-5-nitrobenzyl bromide enhanced MuIFN-alpha activity while diminishing MuIFN-beta activity.

    Conclusions:

    • Specific amino acid residues play distinct roles in the functions of MuIFN-alpha and MuIFN-beta.
    • Chemical modification can differentiate between MuIFN-alpha and MuIFN-beta based on their responses to cysteine and tryptophan modification.
    • The findings suggest that biologic and antigenic sites of MuIFN may be closely associated, and chemical modification offers a method to correlate interferon properties with primary structure.