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• W2029573145 endingPage "e1001061" @default.
• W2029573145 startingPage "e1001061" @default.
• W2029573145 abstract "Hypervirulent strains of Clostridium difficile have emerged over the past decade, increasing the morbidity and mortality of patients infected by this opportunistic pathogen. Recent work suggested the major C. difficile virulence factor, TcdB, from hypervirulent strains (TcdBHV) was more cytotoxic in vitro than TcdB from historical strains (TcdBHIST). The current study investigated the in vivo impact of altered TcdB tropism, and the underlying mechanism responsible for the differences in activity between the two forms of this toxin. A combination of protein sequence analyses, in vivo studies using a Danio rerio model system, and cell entry combined with fluorescence assays were used to define the critical differences between TcdBHV and TcdBHIST. Sequence analysis found that TcdB was the most variable protein expressed from the pathogenicity locus of C. difficile. In line with these sequence differences, the in vivo effects of TcdBHV were found to be substantially broader and more pronounced than those caused by TcdBHIST. The increased toxicity of TcdBHV was related to the toxin's ability to enter cells more rapidly and at an earlier stage in endocytosis than TcdBHIST. The underlying biochemical mechanism for more rapid cell entry was identified in experiments demonstrating that TcdBHV undergoes acid-induced conformational changes at a pH much higher than that of TcdBHIST. Such pH-related conformational changes are known to be the inciting step in membrane insertion and translocation for TcdB. These data provide insight into a critical change in TcdB activity that contributes to the emerging hypervirulence of C. difficile." @default.
• W2029573145 created "2016-06-24" @default.
• W2029573145 creator A5015115989 @default.
• W2029573145 creator A5047944381 @default.
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• W2029573145 date "2010-08-19" @default.
• W2029573145 modified "2023-10-05" @default.
• W2029573145 title "Variations in TcdB Activity and the Hypervirulence of Emerging Strains of Clostridium difficile" @default.
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• W2029573145 doi "https://doi.org/10.1371/journal.ppat.1001061" @default.
• W2029573145 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2924371" @default.
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• W2029573145 hasPublicationYear "2010" @default.
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