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Related Experiment Videos

Subunit characterization of lens intermediate filaments

N Lieska, J Chen, H Maisel

    Biochimica Et Biophysica Acta
    |November 20, 1980
    PubMed
    Summary

    Researchers identified three distinct 54-kDa polypeptides, named lentins (alpha, beta, gamma), as the subunits of bovine ocular lens intermediate filaments. These lentin subunits self-assemble into filaments, revealing insights into lens structure.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Ophthalmology

    Background:

    • Intermediate filaments are crucial structural components in eukaryotic cells.
    • The bovine ocular lens contains unique intermediate filament systems.

    Purpose of the Study:

    • To characterize the subunit composition of bovine ocular lens intermediate filaments.
    • To investigate the self-assembly properties of these subunits.

    Main Methods:

    • Fractionation of intermediate filaments into constituent polypeptides.
    • Purification of polypeptides using ion-exchange chromatography.
    • Regeneration of filaments from purified subunit fractions.

    Main Results:

    • Identified three distinct 54-kDa polypeptides (alpha, beta, gamma lentins) in equimolar amounts.

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  • Demonstrated that each lentin fraction can regenerate native-appearance filaments.
  • Observed formation of smaller protofilaments when using one or two lentin fractions.

    • Conclusions:

    • The three lentin polypeptides (alpha, beta, gamma) are the distinct subunit species of bovine ocular lens intermediate filaments.
    • The equimolar presence and distinct properties suggest they are not artifacts of interconversion.
    • Self-assembly studies provide insights into the structural organization of lens filaments.