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Related Concept Videos

Flagella and Motility in Bacteria01:18

Flagella and Motility in Bacteria

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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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Fimbriae, Pili, and Axial Filaments01:28

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Fimbriae and pili are specialized bacterial surface structures that play pivotal roles in adhesion, genetic exchange, and motility. Composed primarily of pilin protein, these hairlike appendages are crucial for bacterial survival and pathogenicity in various environments.Fimbriae: Adhesion and PathogenicityFimbriae are fine, filamentous structures measuring 2–10 nanometers in diameter and are densely distributed on the bacterial cell surface. They facilitate bacterial adhesion to abiotic...
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Chemotaxis in Escherichia coli is a sensory-driven motility mechanism that enables bacteria to navigate chemical gradients, moving toward beneficial environments while avoiding harmful conditions. This process relies on a signal transduction system integrating external chemical cues with flagellar motor control.Chemoreceptors and Signal DetectionE. coli detects chemical gradients through methyl-accepting chemotaxis proteins (MCPs), which are membrane-bound chemoreceptors that sense attractants...
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Adherens Junctions01:24

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Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
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Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a...
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Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
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Related Experiment Video

Updated: Sep 27, 2025

Investigating Flagella-Driven Motility in Escherichia coli by Applying Three Established Techniques in a Series
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Flagella at the Host-Microbe Interface: Key Functions Intersect With Redundant Responses.

Douglas T Akahoshi1, Charles L Bevins1

  • 1Department of Microbiology and Immunology, School of Medicine, University of California, Davis, Davis, CA, United States.

Frontiers in Immunology
|April 11, 2022
PubMed
Summary
This summary is machine-generated.

Bacterial flagella enable microbe motility for various functions, impacting host-microbe interactions. Hosts have evolved immune defenses against flagellar motility, even in commensal bacteria, highlighting its significance.

Keywords:
DEFA6IBDIgALYPD8TLR5ZG16fliCgoblet cell

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Area of Science:

  • Microbiology
  • Immunology
  • Cell Biology

Background:

  • Bacterial flagella are essential organelles for microbial locomotion and survival.
  • Flagellar motility provides bacteria with advantages like nutrient acquisition and host cell interaction.
  • Host immune systems have evolved mechanisms to counteract bacterial flagellar motility.

Purpose of the Study:

  • To explore the dual role of bacterial flagella in microbial fitness and host-pathogen/commensal interactions.
  • To review the host immune strategies developed against flagellar motility.
  • To emphasize the importance of host-microbe interactions involving flagella, even in homeostasis.

Main Methods:

  • Literature review of studies on bacterial flagellar motility.
  • Analysis of host immune responses to flagellated bacteria.
  • Comparison of flagellar roles in pathogens versus commensals.

Main Results:

  • Flagellar motility aids bacteria in host colonization, invasion, and nutrient seeking.
  • Host defenses include physical barriers, molecular recognition of flagellin, and direct inhibition of flagellar function.
  • Immune responses target flagella even in commensal bacteria, indicating their broad importance.

Conclusions:

  • Bacterial flagella are critical virulence and survival factors.
  • Host immune systems possess robust, multi-faceted strategies to control flagellar motility.
  • Understanding flagellar-mediated host-microbe interactions is crucial for both pathogenesis and homeostasis.