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Related Experiment Videos

Comparative electron-microscope studies on type-III and type-I collagens.

H Wiedemann, E Chung, T Fujii

    European Journal of Biochemistry
    |February 21, 1975
    PubMed
    Summary
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    Electron microscopy revealed distinct structural differences between type I and type III collagen crystallites, with type III collagen showing an additional band near the carboxy-terminal end. Despite these variations, both collagen types form native fibrils with similar patterns.

    Area of Science:

    • Biochemistry
    • Structural Biology
    • Molecular Biology

    Background:

    • Collagen is a crucial structural protein in connective tissues.
    • Type I and type III collagens are major fibrillar collagens with distinct molecular compositions.
    • Understanding their structural differences is key to comprehending tissue development and disease.

    Purpose of the Study:

    • To compare the ultrastructure of long-spacing-segment crystallites from type I and type III collagen.
    • To identify structural variations in collagen molecules using electron microscopy.
    • To investigate the implications of these variations on fibril formation.

    Main Methods:

    • Preparation of long-spacing-segment crystallites from type I ([alpha(I)]i12alpha2) and type III ([alpha1(III)]3) collagens.

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  • Electron microscopy imaging of crystallites.
  • Positive staining using phosphotungstic acid and uranyl acetate.
  • Limited pepsin digestion of type III collagen crystallites.

    • Main Results:

    • Significant differences in cross-striation band intensities and positions were observed between type I and type III collagen crystallites.
    • Type III collagen crystallites exhibited an additional intensely staining band at the carboxy-terminal end.
    • This additional band in type III collagen persisted after pepsin digestion, suggesting a slightly elongated helical region.
    • Despite structural differences, type III collagen molecules formed native fibrils with patterns and periodicity comparable to type I collagen.

    Conclusions:

    • Type III collagen possesses unique structural features, including an extended carboxy-terminal helical region, compared to type I collagen.
    • These molecular variations do not impede the formation of native-like collagen fibrils.
    • Collagen structural heterogeneity contributes to the diverse properties of connective tissues.