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Related Experiment Videos

Diffraction patterns from stained and unstained helices: consistency or contradiction?

B L Trus, A C Steven

    Ultramicroscopy
    |January 1, 1984
    PubMed
    Summary

    Computational simulations reveal that negative staining electron microscopy and X-ray fiber diffraction integration is complex. Thin stain layers introduce "edge effects," altering diffraction patterns and complicating analysis of macromolecular helices.

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    Area of Science:

    • Structural Biology
    • Biophysics
    • Electron Microscopy

    Background:

    • Integrating negative staining electron microscopy (NSEM) with X-ray fiber diffraction (XFD) is crucial for studying macromolecular helices.
    • Understanding the impact of staining on diffraction patterns is key to accurate structural determination.

    Purpose of the Study:

    • To investigate the influence of negative staining on diffraction patterns of helical specimens.
    • To assess the reliability of using optical diffraction patterns from NSEM to match X-ray diffraction patterns of hydrated fibers.
    • To differentiate between staining artifacts and actual molecular distortions.

    Main Methods:

    • Computational simulations of stained and unstained helical models (F-actin, decorated actin, microtubules).
    • Comparison of optical diffraction patterns from simulated NSEM images with X-ray diffraction patterns of hydrated fibers.

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  • Modeling of diffraction pattern changes due to molecular distortions (shrinkage, flattening).

    • Main Results:

    • Thick stain layers (> specimen diameter) may allow reliable matching of optical and X-ray diffraction patterns, but can limit resolution due to dynamic scattering.
    • Thin staining, common in practice, introduces "edge effects" that alter diffraction patterns, differing from unstained specimens.
    • Distinguishing between "edge effects" and molecular distortions based solely on diffraction pattern differences is not feasible a priori.
    • Experimental data from tobacco mosaic virus show significant discrepancies between X-ray diffraction of hydrated sols and NSEM Fourier transforms.

    Conclusions:

    • The reliability of integrating NSEM and XFD depends heavily on stain layer thickness and potential artifacts.
    • "Edge effects" from thin negative staining can mask or mimic molecular distortions, challenging accurate structural interpretation.
    • Direct comparison of experimental XFD and NSEM data is essential for validating structural models of helical specimens.