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Related Experiment Videos

Flexibility in tobacco mosaic virus.

K C Holmes

    Ciba Foundation Symposium
    |January 1, 1983
    PubMed
    Summary

    Tobacco mosaic virus (TMV) assembly involves RNA threading through protein disks. Flexible polypeptide segments in TMV protein subunits facilitate this process, shielding RNA in the final helical structure.

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    Area of Science:

    • Virology
    • Structural Biology
    • Biochemistry

    Background:

    • Tobacco mosaic virus (TMV) possesses a distinctive rod-like structure.
    • TMV is composed of 2140 protein subunits arranged helically around a single RNA strand.
    • The virus features a central channel and specific protein-nucleic acid interactions.

    Purpose of the Study:

    • To elucidate the mechanism of TMV assembly.
    • To investigate the role of protein subunit flexibility during viral assembly.
    • To understand how TMV shields its RNA within the helical structure.

    Main Methods:

    • Analysis of TMV particle structure using diffraction studies.
    • Proton nuclear magnetic resonance (NMR) spectroscopy to study protein dynamics.
    • Inference of polypeptide segment flexibility based on structural and spectroscopic data.

    Main Results:

    • TMV assembly involves RNA threading through a growing protein rodlet, utilizing a preassembled double disk intermediate.
    • A specific segment of approximately 20 amino acid residues in the protein subunit exhibits significant flexibility in the disk state.
    • In the assembled helical virus, these flexible residues adopt a defined conformation, effectively shielding the RNA from the central channel.

    Conclusions:

    • The flexibility of protein subunits is crucial for the efficient assembly of Tobacco mosaic virus.
    • The conformational changes in protein segments ensure the protection of the viral RNA in the mature virion.
    • Understanding TMV assembly provides insights into virus structure-function relationships and molecular mechanisms in virology.

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