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Related Experiment Videos

Photodynamic protein cross-linking

H Verweij, T M Dubbelman, J Van Steveninck

    Biochimica Et Biophysica Acta
    |September 21, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Visible light exposure causes spectrin photo-oxidation, primarily affecting histidine residues. This leads to polypeptide cross-linking, with evidence suggesting amino group involvement in the reaction.

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    Area of Science:

    • Biochemistry
    • Photochemistry
    • Molecular Biology

    Background:

    • Spectrin, a key cytoskeletal protein, undergoes photo-oxidation and cross-linking when exposed to visible light and photosensitizers.
    • Previous research suggested cross-linking results from reactions between photo-oxidized histidine residues and amino groups.

    Purpose of the Study:

    • To investigate the role of histidine photo-oxidation and amino group reactions in spectrin cross-linking.
    • To elucidate the mechanisms underlying photodynamic cross-linking in spectrin.

    Main Methods:

    • Illumination of spectrin with visible light in the presence of a photosensitizer.
    • Monitoring of histidine photo-oxidation and free amino group levels.
    • Assessing the effect of semicarbazide and amidination on cross-linking.

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  • Utilizing gel electrophoresis to visualize protein cross-linking.

    • Main Results:

    • Significant photo-oxidation of histidine residues and a decrease in free amino groups were observed during illumination.
    • Semicarbazide inhibited cross-linking and bound to a histidine photo-oxidation product.
    • The pH profiles for histidine photo-oxidation and cross-linking were similar.
    • Amidination of spectrin did not inhibit cross-linking, while it partially inhibited cross-linking in denatured myoglobin.

    Conclusions:

    • The findings support the involvement of amino groups in spectrin cross-linking, consistent with previous hypotheses.
    • However, the results also indicate the existence of alternative photodynamic cross-linking mechanisms beyond amino group reactions.