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Locust collagen: morphological and biochemical characterization.

D E Ashhurst, A J Bailey

    European Journal of Biochemistry
    |January 1, 1980
    PubMed
    Summary
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    Locust collagen forms segment-long-spacing crystallites and fibrils, similar to mammalian type I collagen. This insect collagen is an alpha 1 trimer, distinct from mammalian type I collagen structures.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Structural Biology

    Background:

    • Collagen is a crucial structural protein found in connective tissues.
    • Type I collagen is the most abundant collagen in mammals, forming fibrils.
    • Understanding collagen structure in invertebrates provides insights into evolutionary conservation.

    Purpose of the Study:

    • To characterize the collagen from the adult male locust, Locusta migratoria.
    • To compare the structural and biochemical properties of locust collagen with mammalian type I collagen.
    • To determine the molecular composition of locust fibrous collagen.

    Main Methods:

    • Extraction and purification of collagen from locust ejaculatory ducts.
    • Formation of segment-long-spacing (SLS) crystallites and reconstituted fibrils.

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  • Positive staining and electron microscopy for structural analysis.
  • Biochemical analysis using pepsin digestion and CNBr peptide mapping.
  • Analysis of collagenous components and alpha chain composition.

    • Main Results:

    • Locust collagen formed SLS crystallites and fibrils with banding patterns similar to mammalian type I collagen.
    • Native locust fibrils exhibited a periodic pattern comparable to type I fibrils, though less distinct.
    • Biochemical analysis revealed two collagenous components; the major one is an alpha 1 trimer, lacking alpha 2 chains.
    • The alpha chains of the major locust collagen component showed similarities to mammalian alpha 1 (I) chains but with elevated hydroxylysine and differing CNBr peptides.
    • A minor component suggested the presence of a type IV basement membrane collagen.

    Conclusions:

    • The fibrous collagen molecule of Locusta migratoria is structurally and biochemically similar to mammalian type I collagen trimers.
    • Locust collagen represents an alpha 1 trimer, differing from the typical mammalian alpha 1 (I) alpha 2 (I) heterotrimer.
    • These findings highlight conserved features of fibrous collagen across invertebrates and mammals, with specific adaptations in locust collagen.