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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...
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...
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...
Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
Formation of Intermediate Filaments00:57

Formation of Intermediate Filaments

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 reported.
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...

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Related Experiment Video

Updated: Jun 13, 2026

Covalent Immobilization of Proteins for the Single Molecule Force Spectroscopy
11:13

Covalent Immobilization of Proteins for the Single Molecule Force Spectroscopy

Published on: August 20, 2018

New insights into F-pilus structure, dynamics, and function.

Philip M Silverman1, Margaret B Clarke

  • 1Oklahoma Medical Research Foundation, Oklahoma City, OK 73104, USA. silvermanp@omrf.org

Integrative Biology : Quantitative Biosciences From Nano to Macro
|May 18, 2010
PubMed
Summary
This summary is machine-generated.

F-pili, filaments for bacterial gene transfer, search for recipient cells and aid in cell-cell contact. F-pilin protein is also crucial for a later, undefined step in DNA transfer.

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Visualization of Twitching Motility and Characterization of the Role of the PilG in Xylella fastidiosa
08:44

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

Published on: April 8, 2016

Related Experiment Videos

Last Updated: Jun 13, 2026

Covalent Immobilization of Proteins for the Single Molecule Force Spectroscopy
11:13

Covalent Immobilization of Proteins for the Single Molecule Force Spectroscopy

Published on: August 20, 2018

Visualization of Twitching Motility and Characterization of the Role of the PilG in Xylella fastidiosa
08:44

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

Published on: April 8, 2016

Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • F-pili are Gram-negative pili involved in bacterial horizontal gene transfer.
  • The precise function of F-pili beyond initial cell contact has been debated for decades.
  • Previous hypotheses proposed F-pili act as retracting structures or passive DNA conduits.

Purpose of the Study:

  • To review recent data on F-pilus function.
  • To integrate historical knowledge with modern imaging techniques.
  • To clarify the role of F-pili in bacterial conjugation.

Main Methods:

  • Review of existing literature.
  • Integration of established F-pilus biology with modern fluorescence microscopy.
  • Integration of established F-pilus biology with modern electron microscopy.

Main Results:

  • F-pili actively search a large volume for recipient cells in liquid culture.
  • F-pilus retraction brings contacted cells into close proximity.
  • F-pilin is essential for a subsequent, undefined step after cell-cell contact.

Conclusions:

  • F-pili have a dual role: searching for cells and facilitating later stages of conjugation.
  • Modern microscopy supports the dynamic nature of F-pili in cell searching.
  • Further research is needed to define the role of F-pilin in post-contact DNA transfer.