Abstract
The cholesterol-dependent cytolysins (CDCs) are one of the most widely disseminated toxins known. The toxin gene or the gene product has been identified in numerous species from five different genera of gram-positive bacteria. These genera include Clostridium, Bacillus, Streptococcus, Listeria, and most recently Arcanobacterium. The fact that this gene is so widely distributed among these various pathogenic bacteria suggests that it fills an important role in the pathogenic mechanism of these organisms. The CDCs also exhibit many unique features, including an absolute dependence of their cytolytic activity on the presence of cholesterol in the membrane and the formation of very large oligomeric complexes, and therefore pores, on the membranes of cells. These toxins have been shown to be cytolytic to many eukaryotic cell types, although the bulk of the literature has focused on the hemolytic activity of these toxins. The crystal structure of one CDC has been solved, and experimental approaches combining molecular biology techniques and various biophysical analyses have helped uncover fundamental features by which these toxins assemble and insert into the membrane. Several excellent reviews have been published on these toxins, but this review will focus on recent advances that have elucidated some of the structure-function relationships of CDC toxins.
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Tweten, R.K., Parker, M.W., Johnson, A.E. (2001). The Cholesterol-Dependent Cytolysins. In: van der Goot, F.G. (eds) Pore-Forming Toxins. Current Topics in Microbiology and Immunology, vol 257. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-56508-3_2
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DOI: https://doi.org/10.1007/978-3-642-56508-3_2
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