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• W2149173205 abstract "The surface-localized M protein of Streptococcus pyogenes is a major virulence factor that inhibits phagocytosis, as determined ex vivo. Because little is known about the role of M protein in vivo we analyzed the contribution of different M protein regions to virulence, using the fibrinogen (Fg)-binding M5 protein and a mouse model of acute invasive infection. This model was suitable, because M5 is required for mouse virulence and binds mouse and human Fg equally well, as shown here. Mixed infection experiments with wild type bacteria demonstrated that mutants lacking the N-terminal hypervariable region (HVR) or the Fg-binding B-repeat region were strongly attenuated, while a mutant lacking the conserved C-repeats was only slightly attenuated. Because the HVR of M5 is not required for phagocytosis resistance, our data imply that this HVR plays a major but unknown role during acute infection. The B-repeat region is required for phagocytosis resistance and specifically binds Fg, suggesting that it promotes virulence by binding Fg. However, B-repeat mutants were attenuated even in Fg-deficient mice, implying that the B-repeats may have a second function, in addition to Fg-binding. These data demonstrate that two distinct M5 regions, including the HVR, are essential to virulence during the early stages of an infection. In particular, our data provide the first in vivo evidence that the HVR of an M protein plays a major role in virulence, focusing interest on the molecular role of this region." @default.
• W2149173205 created "2016-06-24" @default.
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• W2149173205 date "2009-10-01" @default.
• W2149173205 modified "2023-10-04" @default.
• W2149173205 title "Functional Dissection of Streptococcus pyogenes M5 Protein: the Hypervariable Region is Essential for Virulence" @default.
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• W2149173205 doi "https://doi.org/10.1371/journal.pone.0007279" @default.
• W2149173205 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2749438" @default.
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