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Related Concept Videos

Fimbriae, Pili, and Axial Filaments01:28

Fimbriae, Pili, and Axial Filaments

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...
Surface Appendages of Archaea01:23

Surface Appendages of Archaea

Archaeal surface appendages are highly specialized structures essential for environmental adaptation, encompassing roles in adhesion, biofilm formation, and motility. Among these appendages, pili and archaella stand out for their distinct morphologies and functionalities, enabling archaea to thrive in diverse and often extreme environments.Pili: Adhesion and Biofilm FormationPili are filamentous structures assembled from pilin protein subunits, primarily contributing to adhesion and biofilm...
Mechanism of Filopodia Formation01:39

Mechanism of Filopodia Formation

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.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Disassembly of Intermediate Filaments01:35

Disassembly of Intermediate Filaments

Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
The Structure of Intermediate Filaments01:19

The Structure of Intermediate Filaments

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.
Intermediate filaments...
Assembly of Cytoskeletal Filaments01:18

Assembly of Cytoskeletal Filaments

Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...

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Related Experiment Video

Updated: May 28, 2026

Simultaneous Visualization of the Dynamics of Crosslinked and Single Microtubules In Vitro by TIRF Microscopy
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Published on: February 18, 2022

Visualization of Type IV Pili: Linking Structural Architecture, Dynamic Function, and Translational Opportunities.

Jingchao Zhang1, Yutong Liu2

  • 1College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China.

Biology
|May 26, 2026
PubMed
Summary

Recent imaging advances allow visualization of bacterial type IV pili (filamentous nanomachines) in native states. This reshapes understanding of their structure, assembly, and functions, aiding applications in medicine and biotechnology.

Keywords:
biofilm formationcryo-EMtwitching motilitytype IV pilivisualization techniques

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Visualization of Twitching Motility and Characterization of the Role of the PilG in Xylella fastidiosa
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Visualization of Twitching Motility and Characterization of the Role of the PilG in Xylella fastidiosa

Published on: April 8, 2016

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Last Updated: May 28, 2026

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07:20

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Visualizing Actin and Microtubule Coupling Dynamics In Vitro by Total Internal Reflection Fluorescence (TIRF) Microscopy
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08:44

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Published on: April 8, 2016

Area of Science:

  • Microbiology
  • Biophysics
  • Cell Biology

Background:

  • Type IV pili are versatile protein filaments crucial for bacterial functions like motility and DNA uptake.
  • Visualizing these dynamic nanomachines in their native environment has been challenging due to their small size and sensitivity.
  • Understanding their structure and function is key to harnessing their potential in various applications.

Purpose of the Study:

  • To review recent advancements in imaging techniques for visualizing type IV pili.
  • To summarize how these new methods have improved understanding of pili architecture, assembly, and function.
  • To discuss the translational potential of imaging-informed knowledge in areas like antivirulence and biotechnology.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) and cryo-electron tomography (cryo-ET) for high-resolution structural analysis.
  • Fluorescence-based live-cell imaging for observing dynamic processes.
  • Label-free techniques like interferometric scattering microscopy (iSCAT) for sensitive detection.

Main Results:

  • New imaging strategies provide unprecedented spatial and temporal resolution of type IV pili.
  • Detailed insights into filament architecture, assembly machinery, and force-dependent behaviors have been gained.
  • Visualization has clarified context-specific physiological roles in diverse bacterial species.

Conclusions:

  • Advanced imaging has revolutionized the study of type IV pili, offering a dynamic and functional perspective.
  • Imaging-informed knowledge supports potential applications in antivirulence strategies, vaccine development, and bioengineering.
  • Further integration of structural, dynamic, and functional data is crucial for future research and applications.