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Related Experiment Videos

Isopeptide bond formation in epidermis.

J Kubilus, H P Baden

    Molecular and Cellular Biochemistry
    |January 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Epidermal transglutaminases are crucial enzymes in skin biology. This study identifies key substrate proteins, potential precursors to the cornified envelope, in human, cow, and rat keratinocytes.

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    Area of Science:

    • Biochemistry
    • Dermatology
    • Cell Biology

    Background:

    • Epidermal transglutaminases play a vital role in skin structure and barrier function.
    • Identifying their substrates is key to understanding keratinocyte differentiation and cornification.

    Purpose of the Study:

    • To identify and characterize major and minor protein substrates of epidermal transglutaminases in cultured human, cow, and rat keratinocytes.
    • To investigate the role of these substrates as precursors to the cornified envelope.

    Main Methods:

    • Culturing of human, cow, and new-born rat keratinocytes.
    • Sodium dodecyl sulfate (SDS) polyacrylamide gel electrophoresis (PAGE) to analyze protein sizes.
    • Preparative electrophoresis for isolation of specific substrates.

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    Main Results:

    • Identified substrate proteins in human, cow, and rat keratinocytes.
    • Observed species-specific differences in substrate protein sizes (e.g., 30-50 kDa dissociable to ≤12 kDa in human and cow; 125 kDa precursor in human; 100 kDa and 23 kDa in cow and rat, respectively).
    • Correlated identified substrates with in vivo synthesized precursors of the cornified envelope.

    Conclusions:

    • Epidermal transglutaminase substrates are conserved across species but exhibit variations.
    • Identified proteins are probable precursors of the cornified envelope, essential for skin barrier formation.
    • Keratins and stratum corneum basic protein are major epidermal structural protein substrates.