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Related Experiment Videos

Structure analysis of fibrinogen by electron microscopy and image processing.

L Beijbom1, U Larsson, U Kavéus

  • 1Department of Medical Biophysics, Karolinska Institutet, Stockholm, Sweden.

Journal of Ultrastructure and Molecular Structure Research
|March 1, 1988
PubMed
Summary

Electron microscopy revealed the trinodular structure of human fibrinogen. Analysis showed continuous distribution of molecular folding, with an average maximally extended conformation.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Electron Microscopy

Background:

  • Fibrinogen is a key protein in blood coagulation.
  • Understanding its molecular structure is crucial for comprehending its function.
  • Previous models suggested a trinodular structure.

Purpose of the Study:

  • To visualize and analyze the structure of human fibrinogen using electron microscopy.
  • To quantitatively assess the flexibility and conformational distribution of fibrinogen molecules.
  • To refine structural models of fibrinogen.

Main Methods:

  • Human fibrinogen was visualized using electron microscopy with rotary shadowing.
  • Image processing techniques, including selection, alignment, and classification, were applied to electron micrographs.

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  • Correspondence analysis was used to study molecular folding.

    • Main Results:

    • The widely accepted trinodular structure of fibrinogen was confirmed.
    • Quantitative analysis revealed a continuous distribution of molecular folding, with an average conformation representing maximum extension.
    • The averaged structure measured approximately 450 Å in length, with specific dimensions for central and peripheral domains.

    Conclusions:

    • Electron microscopy and image processing provide detailed insights into fibrinogen structure and flexibility.
    • The study quantitatively supports a flexible, continuously distributed conformational landscape for fibrinogen.
    • The findings contribute to a more precise understanding of fibrinogen's role in hemostasis.