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Sciatin is a transferrin-like polypeptide

G J Markelonis, R A Bradshaw, T H Oh

    Journal of Neurochemistry
    |August 1, 1982
    PubMed
    Summary
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    Sciatin, a protein from chicken sciatic nerve, promotes muscle cell growth and shares structural similarities with transferrin. This suggests sciatin is a growth-promoting polypeptide closely related to transferrin.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Cell Biology

    Background:

    • Sciatin is an acidic glycoprotein isolated from chicken sciatic nerve.
    • Sciatin exhibits myotrophic effects on avian skeletal muscle cells in culture.
    • Structural similarities between sciatin and transferrin prompted further investigation.

    Purpose of the Study:

    • To investigate the physiochemical characteristics of sciatin.
    • To determine the relationship between sciatin and transferrin.
    • To confirm sciatin's role in muscle cell growth.

    Main Methods:

    • Amino acid composition and sequence analysis.
    • Rocket immunoelectrophoresis and double immunodiffusion.
    • Iron binding assays and protein purification from chicken serum.

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  • Two-dimensional gel electrophoresis.

    • Main Results:

    • Sciatin demonstrated striking similarity to ovotransferrin in amino acid composition and identical N-terminal sequences.
    • Sciatin bound ferrous iron, similar to transferrin.
    • A protein purified from chicken serum shared characteristics with sciatin and ovotransferrin, including myotropic effects.

    Conclusions:

    • Sciatin is a growth-promoting polypeptide.
    • Sciatin is structurally closely related to transferrin, particularly ovotransferrin.
    • The findings support a link between transferrin-like proteins and muscle cell growth promotion.