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Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been...
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The intermediate filaments are one of three widely studied cytoskeletal filaments. They are so named as their diameter (10 nm) is in between that of microfilaments (7 nm) and the microtubules (25 nm).  These filaments are highly stable and can remain intact when exposed to high salt concentrations and detergents. These filaments are responsible for providing stability and mechanical support to the cells. They also help in cell adhesion and maintaining tissue integrity.
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Biophysical Characterization of Flagellar Motor Functions
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Structure and Intermolecular Interactions between L-Type Straight Flagellar Filaments.

Daniel Louzon1, Avi Ginsburg2, Walter Schwenger3

  • 1The Institute of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, Israel; The Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem, Israel.

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Summary

Bacterial flagellar filaments, though typically helical, assemble straight from a mutated flagellin. This study reveals their precise helical structure and how osmotic stress influences bundling forces.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Microbiology

Background:

  • Bacterial motility relies on flagellar filaments powered by rotary motors.
  • Flagellar filaments are typically helical structures composed of flagellin monomers.
  • A specific mutation in Salmonella Typhimurium flagellin leads to straight filament assembly.

Purpose of the Study:

  • To investigate the structure of straight flagellar filaments from Salmonella Typhimurium SJW1660.
  • To analyze the intermolecular forces governing the assembly of these filaments into hexagonal bundles.
  • To understand the influence of osmotic stress on filament bundling dynamics.

Main Methods:

  • Small-angle X-ray scattering (SAXS) to determine filament structure.
  • Osmotic stress application to induce filament bundling.
  • Monte Carlo simulations and continuum theories for data analysis.
  • Analysis of scattering data from aligned flagellar bundles.

Main Results:

  • The exact helical arrangement and super-helical twist of flagellin subunits within straight filaments were elucidated.
  • Filaments formed two-dimensional hexagonal bundles under osmotic stress.
  • Bundle bulk modulus and filament deflection length were found to be dependent on osmotic stress.
  • Contributions of electrostatic, hydration, and elastic forces to intermolecular interactions were quantified.

Conclusions:

  • Straight flagellar filaments exhibit a defined helical structure despite the mutation.
  • Osmotic stress plays a critical role in the bundling behavior and mechanical properties of flagellar filaments.
  • Intermolecular forces, including electrostatic, hydration, and elastic interactions, govern the assembly and stability of flagellar bundles.