Type Iv Pili
Type Iv Pili - Related Videos
09:05
High Resolution Electron Microscopy of the Helicobacter pylori Cag Type IV Secretion System Pili Produced in Varying Conditions of Iron Availability
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Cited by 13 •
2014
Here we describe a method to visualize the oncogenic bacterial organelle known as the Cag Type IV Secretion System (Cag-T4SS). We find that the Cag-T4SS is differentially produced on the surface of H. pylori in response to varying conditions of iron availability.
01:05
Type IV Collagen of Basal Lamina
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2023
Type IV collagen is a 400 nm long, network-forming collagen that acts as a barrier between the epithelial and endothelial cells. Type IV collagen forms the backbone of the basement membrane by scaffolding with laminin, entactin, proteoglycans, and fibronectin. Apart from rendering structural support to the basement membrane, it also helps entail signaling potentials necessary for both pathological and physiological functions. A type IV collagen molecule has six alpha chains which can exist in...
01:28
Fimbriae, Pili, and Axial Filaments
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2025
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...
11:00
Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
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Cited by 4 •
2016
Stent implants in stenosed arterial curvatures are prone to "Type IV" failures involving the complete transverse fracture of stents and linear displacement of the fractured parts. We present a protocol for detection of secondary flow (vortical) structures in a curved artery model, downstream of clinically relevant "Type IV" stent failures.
10:14
Recapitulation of an Ion Channel IV Curve Using Frequency Components
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Cited by 1 •
2011
There are technical obstacles to measuring current flux through multiple ion channels simultaneously, and later discerning what portion of the transmembrane current is due to each channel type. To address this need, this method presents a way to generate the IV curve of individual channel types using specific frequency components.
FAQs
Type IV pili dynamics depend on a coordinated cycle. An assembly ATPase drives filament extension, while a retraction ATPase disassembles the filament and pulls it back. Because retraction generates force, the cycle does more than change pilus length: it converts molecular activity into physical interactions with surfaces and other cells, supporting adhesion and twitching motility.
Pilin subunits provide the material that is repeatedly assembled into and removed from the filament. This construction and disassembly allows the surface structure to respond dynamically rather than remain static. In biological terms, that flexibility helps cells alternate between extending a contact structure and retracting it, a property relevant to attachment, movement, and interactions with neighboring microbes.
Retraction is especially important because it generates force while the filament is disassembled. That force helps connect pilus dynamics with twitching motility and adhesion, rather than treating the pilus as a passive surface fiber. Studying retraction therefore helps explain how microbial cells move across surfaces and maintain interactions with their surroundings.
Research on Type IV Pili connects molecular structure and regulation with host-associated behavior. Their ability to mediate interactions with host cells can support adhesion and colonization, while changes in how the structures are built or controlled may help explain pathogenicity. This makes them useful for investigating how microbes establish relationships with hosts.
The pili contribute to natural DNA uptake, linking a surface structure to acquisition of genetic material. This connection gives Type IV Pili relevance beyond movement and adhesion: it places them in studies of bacterial genetic exchange, where DNA uptake can be considered alongside biofilm formation, cell aggregation, and interactions with host cells.
Their roles in biofilm formation and cell aggregation make Type IV Pili relevant to research on how microbes organize and persist together. Examining their structure and regulation can also inform antimicrobial strategies by identifying biological processes associated with adhesion, movement, host colonization, and community development. The topic therefore connects cell biology with microbial control.