Type Iv Secretion System
Type Iv Secretion System - Related Videos
01:13
Exocrine Glands: Types of Secretions
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2025
Exocrine glands produce and release a variety of glandular products. Exocrine glands can be classified into serous, mucous, or mixed types based on their secretory products. Serous glands produce watery secretions rich in digestive enzymes and proteins. The constituent cells of the serous gland have centrally located nuclei and eosinophilic secretory granules in the cytoplasm. The parotid gland is an example of a serous gland. It secretes saliva, which contains enzymes, such as lipases and...
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.
03:11
Quantification of Bioactive Type-I Interferons using a Secreted Embryonic Alkaline Phosphatase Reporter Assay
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2025
This video demonstrates secreted embryonic alkaline phosphatase assay using HEK-Blue interferon-α/β reporter cells to quantify the type-I interferons (IFNs) released following stimulation of plasmacytoid dendritic cells by HIV-1 Infected CD4+ T cells.
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...
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.
FAQs
ATPases provide energy that powers substrate transfer through the secretion apparatus. This energy supports movement across the bacterial envelope after the membrane-spanning components have assembled. Because the system can transport DNA, proteins, and other effector molecules, ATPase-driven activity links cellular energy to delivery. In conjugation, this mechanism helps explain how genetic material reaches a neighboring cell.
The apparatus gains its transport capacity from coordinated structural components rather than from a single protein. Membrane-spanning elements form the passage across the bacterial envelope, and the system often includes a pilus. This organization connects the bacterial cell interior with a neighboring or host cell, enabling transported substrates to reach a recipient beyond the producing bacterium.
Substrate identity helps distinguish the biological contexts in which the system operates. Transfer of DNA is central to bacterial conjugation and horizontal gene transfer, whereas delivery of proteins or other effector molecules can support manipulation of host cells during infection. This distinction connects secretion activity with either microbial evolution or pathogen virulence.
Crossing the bacterial envelope is essential because transported material must move beyond the producing cell to affect another cell or host cell. Membrane-spanning components create the route, while ATPase activity supplies energy for transfer. This provides a mechanistic link between envelope architecture and outcomes such as gene exchange or host-cell manipulation.
Because these systems can move DNA between bacteria, their activity can contribute to horizontal gene transfer, a process relevant to microbial evolution and antibiotic resistance. Studying the machinery helps researchers connect physical transport across the envelope with the spread of genetic traits. This makes the system relevant to both basic biology and antimicrobial research.
Researchers can examine how delivery of proteins and other effector molecules changes interactions between bacteria and host cells. The secretion apparatus therefore provides a mechanistic framework for studying pathogen virulence and host-cell manipulation. This focus complements work on DNA transfer because the same system can produce distinct biological consequences depending on the substrate and recipient context.
Their transport capacity makes Type IV Secretion Systems relevant to engineered delivery platforms. In this context, researchers can draw on the system's ability to move DNA, proteins, or other effector molecules across the bacterial envelope. Such work connects fundamental secretion biology with efforts to design molecular delivery approaches for research and biotechnology.