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Flagella are specialized, thread-like structures that extend from a bacteria's cell envelope. They play a crucial role in motility and chemotaxis. Their structural organization and functioning exemplify sophisticated biological engineering, enabling bacterial survival and adaptability in diverse environments.Structure of the FlagellumA bacterial flagellum consists of three key components: the filament, the hook, and basal body. The filament, a long, helical structure composed of repeating...
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Gastrointestinal or GI motility disorders are characterized by irregular gastrointestinal tract movements, disrupting food transit from the mouth to the anus. They are caused by damage or dysfunction in gut muscles or nerves. These disorders can cause symptoms such as severe constipation, diarrhea, abdominal pain, and swallowing difficulties. Disorders can affect any segment of the GI tract and range widely in severity, from common conditions like GERD to life-threatening conditions like...
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Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...
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Investigating Flagella-Driven Motility in Escherichia coli by Applying Three Established Techniques in a Series
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Flagella-Driven Motility of Bacteria.

Shuichi Nakamura1, Tohru Minamino2

  • 1Department of Applied Physics, Graduate School of Engineering, Tohoku University, 6-6-05 Aoba, Aoba-ku, Sendai 980-8579, Japan.

Biomolecules
|July 25, 2019
PubMed
Summary

Bacterial flagella are helical structures enabling motility through rotation. This review details the structure, dynamics, and molecular mechanisms of the bacterial flagellar motor and its role in bacterial navigation.

Keywords:
bacterial flagellumchemotaxision channelion motive forcemechanochemical couplingmolecular motormotilitytorque generation

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biophysics

Background:

  • The bacterial flagellum is a complex helical organelle essential for bacterial motility.
  • Flagella exhibit structural diversity across species but share a common rotary motor.
  • Periplasmic flagella in spirochetes also function as a cytoskeleton.

Purpose of the Study:

  • To review the current understanding of bacterial flagellum structure and dynamics.
  • To elucidate the molecular mechanisms of the flagellar motor.
  • To highlight the role of flagellar motility in bacterial chemotaxis.

Main Methods:

  • Review of recent experimental and theoretical studies.
  • Analysis of structural and functional data on flagellar components.
  • Integration of findings on motor operation and chemotactic regulation.

Main Results:

  • Bacterial flagella generate thrust via a rotating helical filament.
  • The flagellar motor, a rotary nanomachine, converts ion flux into mechanical rotation.
  • Chemotactic pathways regulate flagellar motor direction for environmental navigation.

Conclusions:

  • The bacterial flagellum is a sophisticated motility organelle with a conserved rotary motor.
  • Understanding flagellar structure and dynamics is crucial for deciphering bacterial behavior.
  • Ongoing research continues to reveal intricate details of flagellar motor function.