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Related Experiment Videos

Protein-RNA interactions during TMV assembly.

K C Holmes

    Journal of Supramolecular Structure
    |January 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Structural studies reveal tobacco mosaic virus (TMV) RNA binding involves hydrophobic interactions, hydrogen bonds, and salt bridges. Protein subunits form a disk structure that encapsulates RNA upon binding.

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    Area of Science:

    • Structural biology
    • Virology
    • Biochemistry

    Background:

    • Tobacco mosaic virus (TMV) is a helical microcrystal with RNA embedded in protein subunits.
    • TMV particles form oriented gels suitable for X-ray fiber diffraction.

    Purpose of the Study:

    • To review structural studies of TMV, focusing on RNA-protein interactions.
    • To elucidate the structure of TMV protein disks and their role in RNA binding.

    Main Methods:

    • High-resolution X-ray fiber diffraction of oriented TMV gels.
    • Use of heavy-chain derivatives to generate electron density maps.
    • Analysis of crystallized double disks using noncrystallographic symmetry and heavy-atom derivatives.

    Main Results:

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    • Determined TMV structure at 0.4 nm resolution, revealing RNA configuration and protein subunit structure.
    • Solved the double disk structure at 0.28 nm resolution, highlighting four alpha-helices.
    • Identified the LR helix as the primary RNA binding site, involving hydrophobic, hydrogen bond, and salt bridge interactions.

    Conclusions:

    • The RNA binding site involves specific interactions between protein and RNA components.
    • Protein subunits adopt a random coil conformation until RNA binding, then form a structured, encapsulating layer.