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Calcium-binding proteins in rat skin.

C P Schelling, L Didierjean, M Rizk

    FEBS Letters
    |April 6, 1987
    PubMed
    Summary

    Skin Ca2+-binding protein (SCaBP) is actually epidermal protein (EP-12), distinct from parvalbumin (PV). This finding clarifies SCaBP

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    Area of Science:

    • Biochemistry
    • Dermatology
    • Molecular Biology

    Background:

    • Skin Ca2+-binding protein (SCaBP) was previously thought to be distinct from parvalbumin (PV).
    • Recent studies indicated SCaBP and PV share identical amino acid sequences.
    • This raised questions about their distinct identities and functions in skin.

    Purpose of the Study:

    • To purify and characterize the protein previously identified as SCaBP from rat skin.
    • To determine if this protein is indeed parvalbumin (PV) or a distinct entity.
    • To investigate the localization and potential functions of the purified protein and PV in rat skin.

    Main Methods:

    • Protein purification from isolated adult rat epidermis and newborn rat skin.
    • Biochemical characterization including molecular weight (Mr) and isoelectric point (pI) determination.
    • Analysis of hydrophobicity, amino acid composition, and immunological properties.

    Main Results:

    • A protein, designated epidermal protein (EP-12), was purified with Mr 12,000 and pI 4.5.
    • EP-12 exhibited distinct hydrophobicity, amino acid composition, and immunological properties compared to PV.
    • Previously isolated SCaBP was found to be a mixture of EP-12 and PV.

    Conclusions:

    • Epidermal protein (EP-12) is biochemically and immunologically distinct from parvalbumin (PV).
    • The protein previously identified as SCaBP is a combination of EP-12 and PV.
    • Further research is needed to elucidate the specific roles and localization of EP-12 and PV within the skin.

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