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A structural model for desmosine cross-linked peptides

R P Mecham, J A Foster

    The Biochemical Journal
    |August 1, 1978
    PubMed
    Summary
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    Researchers identified desmosine-enriched peptides from bovine elastin, proposing a two-cross-link model. This model suggests specific alignment of elastin precursor molecules, impacting tissue structure and elasticity.

    Area of Science:

    • Biochemistry
    • Structural Biology
    • Connective Tissue Research

    Background:

    • Elastin is a crucial protein in connective tissues, providing elasticity.
    • Elastin cross-linking is essential for its mechanical properties.
    • Desmosine is a key cross-linking amino acid in mature elastin.

    Purpose of the Study:

    • To elucidate the structural organization of elastin cross-links.
    • To propose a model for elastin peptide chain arrangement.
    • To investigate the implications for elastin precursor molecule alignment.

    Main Methods:

    • Isolation of desmosine-enriched peptides from bovine ligamentum nuchae elastin.
    • Thermolysin digestion of elastin.
    • Partial sequencing of isolated peptides.

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    Main Results:

    • Identification of desmosine-enriched peptides.
    • Proposal of a 'two-cross-link' model involving desmosine and potentially lysinonorleucine.
    • The model suggests specific peptide chain orientation (parallel or anti-parallel) due to cross-linking site alignment.

    Conclusions:

    • The proposed two-cross-link model implies directionality in elastin peptide chains.
    • This directionality may facilitate the alignment of elastin precursor molecules.
    • Potential involvement of microfibrillar proteins or intrinsic aligning peptides in elastin assembly.