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Related Experiment Videos

The staining pattern of collagen fibrils. Improved correlation with sequence data

K M Meek, J A Chapman, R A Hardcastle

    The Journal of Biological Chemistry
    |November 10, 1979
    PubMed
    Summary

    This study enhances collagen fibril banding pattern analysis by incorporating both alpha 1 and alpha 2 amino acid sequences. Improved correlation reveals precise locations of charged residues, aiding in understanding collagen structure and function.

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    Area of Science:

    • Biochemistry
    • Structural Biology
    • Biophysics

    Background:

    • Collagen fibrils exhibit periodic banding patterns visible under electron microscopy.
    • These patterns are thought to relate to the distribution of charged amino acid residues within the collagen molecule.
    • Previous studies utilized only alpha 1 chain sequence data for correlation.

    Purpose of the Study:

    • To improve the correlation between collagen fibril banding patterns and charge distribution.
    • To incorporate both alpha 1 and alpha 2 collagen chain sequence data for a comprehensive analysis.
    • To refine the periodicity value (D) of collagen fibrils.

    Main Methods:

    • Analysis of complete amino acid sequence data from both alpha 1 and alpha 2 collagen chains.
    • Modeling of collagen fibril structure, including the assumption of contracted extrahelical terminal regions.

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  • Calculation of the optimal periodicity (D) based on sequence data.

    • Main Results:

    • Incorporating both alpha 1 and alpha 2 sequence data significantly improved the correlation between banding patterns and charge distribution.
    • The optimal periodicity (D) was refined to 234.2 +/- 0.5 residues, showing better agreement with other studies.
    • Axial locations of charged residues within the fibril were mapped, identifying residues contributing to specific bands.

    Conclusions:

    • The complete charge distribution from alpha 1 and alpha 2 chains provides a more accurate model for collagen fibril banding.
    • The refined periodicity value (D) enhances the understanding of collagen molecular packing.
    • This approach allows for the identification of specific charged residues responsible for the observed banding patterns in collagen fibrils.