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Blue-fluorescent bovine alpha-crystallin.

E Fujimori

    Biochimica Et Biophysica Acta
    |May 24, 1978
    PubMed
    Summary

    Blue-fluorescent alpha-crystallin from bovine lenses shows two distinct fluorescence peaks. Aging causes low molecular weight alpha-crystallin to form blue-fluorescent aggregates.

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    Area of Science:

    • Ophthalmology
    • Biochemistry
    • Proteomics

    Background:

    • Alpha-crystallin is a major protein in the eye lens.
    • Lens proteins undergo age-related modifications.
    • Blue fluorescence in the lens is associated with aging and cataract formation.

    Purpose of the Study:

    • To isolate and characterize blue-fluorescent alpha-crystallin from bovine lenses.
    • To investigate the relationship between alpha-crystallin aggregation and blue fluorescence.
    • To understand the impact of aging on lens protein fluorescence.

    Main Methods:

    • Gel-filtration chromatography using Sephacryl S-200 Superfine for protein isolation.
    • Spectrofluorometry to determine fluorescence excitation and emission spectra.
    • Analysis of molecular weight and aggregation states of alpha-crystallin.

    Main Results:

    • Blue-fluorescent alpha-crystallin was successfully isolated from bovine lenses.
    • Characterization revealed two distinct blue fluorescence peaks (approx. 410, 435 nm) and excitation peaks (approx. 350, 370 nm).
    • Both low and high molecular weight alpha-crystallin fractions exhibited blue fluorescence, with aging promoting the shift of low molecular weight forms to higher molecular weight, blue-fluorescent aggregates.

    Conclusions:

    • Bovine alpha-crystallin possesses at least two distinct blue fluorescence components.
    • Aging in bovine lenses leads to the formation of non-covalently linked, blue-fluorescent high molecular weight alpha-crystallin aggregates.
    • These findings contribute to understanding age-related changes in lens proteins and their optical properties.

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