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>> Mechanism of receptor mediated direct penetration
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Mechanism of receptor mediated direct penetration

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Thus, the unlocking process is usually directly coupled to the mechanisms through which viral genomes are transferred across a limiting cellular membrane usually the plasma membrane or endosome membrane , the principal barrier to infection. Conformational changes, plasma membrane penetration, and infection by human rhinovirus type 2: Although it is clear that many viruses—in particular, pH-dependent viruses—have an absolute dependence on endocytosis for productive infection, some viruses may exhibit plasticity in their mechanism of entry. In the case of endocytic trafficking from the plasma membrane, these proteins co-localize and complex on the cytosolic side of the plasma membrane to form a coat at the site of endocytosis. For most CPPs, it is now generally concluded that endocytosis is involved in the translocation mechanism. Fusion of other enveloped viruses occurs within the low-pH environment of an acidic endosomal compartment. Sialic acid glycoproteins inhibit in vitro and in vivo replication of rotaviruses.

Streptococcal Infections and Sequelae Dennis L. Direct penetration via energy-independent pathways may include different mechanisms that have been described as inverted micelle formation [ 8 ], pore formation [ 36 ], the carpet-like model [ 37 ] and the membrane thinning model [ 38 ]. We have summarized important mechanistic results obtained from different reports on each investigated CPP. Wooldridge, in Medical Microbiology Eighteenth Edition , Exotoxins Exotoxins , in contrast to endotoxin, are diffusible proteins secreted into the external medium by the pathogen. However, there are still remaining important questions such as, what are the exact uptake mechanisms, how do different cargo molecules influence the cellular uptake of CPPs, and what are the additional aspects affecting the bioavailability of the CPPs? Synthetic peptides are another group in this category such as the polyarginine family [ 2 , 16 ]. Although most viruses use broadly similar tactics to breach these barriers, many have developed unique approaches that ensure their delivery to optimal cellular sites for replication.

The cell biology of receptor-mediated virus entry

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Scavenger receptor-mediated uptake of cell-penetrating peptide nanocomplexes with oligonucleotides

    Further, endosomes transport the virus through the cell and ensure that no trace of the virus is left on the surface, which could be a substrate for immune recognition. Changes in the conformation of influenza virus hemagglutinin at the pH optimum of virus-mediated membrane fusion. The Tyro3 receptor kinase Axl enhances macropinocytosis of Zaire ebolavirus. They can deliver large-cargo molecules, such as oligonucleotides, into cells. Hepatitis A virus-specific immunoglobulin A mediates infection of hepatocytes with hepatitis A virus via the asialoglycoprotein receptor. Different models have been proposed for describing these mechanisms: Junction adhesion molecule is a receptor for reovirus. Scavenger receptors are cell surface receptors with multiple functions in physiological processes like maintenance of homeostasis, clearance of apoptotic cells and pathogens.

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