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Related Experiment Videos

Domain structure of flagellin.

O V Fedorov, A S Kostyukova

    FEBS Letters
    |June 4, 1984
    PubMed
    Summary

    Bacterial flagellar filaments, crucial for motility, are built from flagellin protein. This study reveals flagellin

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    Area of Science:

    • Microbiology
    • Structural Biology
    • Biophysics

    Background:

    • Bacterial chemotaxis, exemplified by Salmonella and Escherichia coli, relies on flagellar motility.
    • Flagellar filaments exhibit distinct left-handed and right-handed helical structures during swimming and tumbling, respectively.
    • Existing models propose flagellin, the filament's protein subunit, is bistable, adopting one of two conformations.

    Purpose of the Study:

    • To investigate the structural properties of Salmonella and E. coli flagellins in monomeric and polymeric states.
    • To elucidate the molecular basis for flagellar filament assembly and conformational changes.
    • To understand the mechanism underlying flagellin's role in bacterial motility.

    Main Methods:

    • Scanning microcalorimetry was employed to analyze the thermal properties of flagellins.
    • Circular dichroism spectroscopy was used to assess protein secondary structure.
    • Studies were conducted on both monomeric and polymerized flagellin forms.

    Main Results:

    • Flagellin molecules comprise multiple domains.
    • Two domains possess intrinsic structure in monomeric form at physiological temperatures.
    • Other domains gain ordered structure specifically during polymerization into flagellar filaments.

    Conclusions:

    • Flagellin's domain structure facilitates polymerization-induced conformational changes.
    • This conformational adaptation is key to forming the helical flagellar filament.
    • The findings provide insights into the self-assembly mechanism of bacterial flagella.

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