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Related Experiment Videos

An 'affinity' method for preparing polypeptides enriched in the collagen-associated Ehrlich chromogen.

J E Scott, E W Hughes, A Shuttleworth

    Journal of Biochemistry
    |March 1, 1983
    PubMed
    Summary

    Researchers identified collagen-associated compounds reacting with Ehrlichs reagent. A new method isolates these peptides, revealing their low abundance and unique amino acid patterns, distinct from pyridinoline cross-links.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Connective Tissue Research

    Background:

    • Collagen contains compounds that react with Ehrlich's reagent.
    • These compounds are implicated in collagen cross-linking.
    • Pyridinoline is a known collagen cross-link, but its identity with the Ehrlich-reactive compound is uncertain.

    Purpose of the Study:

    • To develop a method for isolating polypeptides associated with the Ehrlich chromogen from collagen.
    • To characterize the amino acid composition of these isolated peptides.
    • To determine if the Ehrlich chromogen is identical to pyridinoline.

    Main Methods:

    • Enzymatic digestion of collagen.
    • Isolation of Ehrlich chromogen-associated peptides using diazotized arylamino-cellulose supports.

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  • Amino acid analysis of isolated peptides.

    • Main Results:

    • A convenient method for isolating Ehrlich chromogen-labeled peptides from collagen digests was established.
    • These peptides represent less than 0.5% of the total collagen.
    • The amino acid patterns of these peptides resemble those found in collagen cross-link regions.
    • The Ehrlich chromogen was determined to be distinct from pyridinoline.

    Conclusions:

    • The Ehrlich chromogen is a collagen-associated compound, separable via a novel method.
    • The isolated peptides provide insights into collagen cross-linking mechanisms.
    • The Ehrlich chromogen is not pyridinoline, suggesting a different structural role or identity.