Biology:Leukocidin
A leukocidin is a type of cytotoxin created by some types of bacteria (Staphylococcus). It is a type of pore-forming toxin. The model for pore formation is step-wise. First, the cytotoxin’s “S” subunit recognizes specific protein-containing receptors, or an integrin on the host cell’s surface. The S subunit then recruits a second, “F” subunit, and the two subunits dimerize on the surface of the host’s cell. After dimerization, oligomerization occurs. Finally, the oligomers, consisting of alternating S and F subunits, undergo a significant structural change and form a beta-barrel, that pierces through the host cell’s lipid bilayer.[1]
Leukocidins get their names by killing ("-cide") leukocytes. Leukocidins target phagocytes,[1] natural killer cells, dendritic cells, and T lymphocytes[2] and therefore targets both, innate and adaptive immune responses. Leukocidins fall into the category of bacterial invasin. Invasins are enzymatic secretions that help bacteria invade the host tissue to which they are attached. Although similar to exotoxins, invasins are different in two respects: they work through much less specific mechanisms than exotoxins, and their actions are generally more localized.
One type is Panton-Valentine leukocidin.
References
- ↑ 1.0 1.1 Alonzo, Francis; Torres, Victor J. (2014-05-20). "The Bicomponent Pore-Forming Leucocidins of Staphylococcus aureus". Microbiology and Molecular Biology Reviews 78 (2): 199–230. doi:10.1128/mmbr.00055-13. ISSN 1092-2172. PMID 24847020.
- ↑ Alonzo III, Francis; Kozhaya, Lina; Rawlings, Stephen A.; Reyes-Robles, Tamara; DuMont, Ashley L.; Myszka, David G.; Landau, Nathaniel R.; Unutmaz, Derya et al. (2012-12-12). "CCR5 is a receptor for Staphylococcus aureus leukotoxin ED". Nature 493 (7430): 51–55. doi:10.1038/nature11724. ISSN 0028-0836. PMID 23235831.
External links
- Leukocidins at the US National Library of Medicine Medical Subject Headings (MeSH)
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