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DltABCD-mediated D-alanylation of teichoic acids in Group A Streptococcus confers innate immune resistance

机译:DLTabcd介导的噻吩酸的D-奥烷化酸中的链球菌赋予天生的免疫抗性

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Group A Streptococcus (GAS) is a major cause of both mucosal and invasive human infections. Epithelial and leukocyte production of cationic antimicrobial peptides (AMPs) is an important aspect of mammalian innate immune defense against bacterial infection. In this study, we identify a specific GAS phenotype that confers resistance to host AMPs. Inactivation of the dltA gene in an invasive serotype Ml GAS isolate led to loss of teichoic acid D-alanylation. Compared to the wild-type strain, the GAS dltA mutant was found to be more susceptible to AMP and lysozyme killing. Killing of the dltA mutant by human PMN, which produce AMPs in large amounts, was greatly accelerated. Thus, teichoic acid D-alanylation may contribute to the ability of invasive GAS to bypass mucosal defenses and produce systemic infection.
机译:组链球菌(气体)是粘膜和侵袭性人类感染的主要原因。阳离子和白细胞产生阳离子抗菌肽(AMPS)是哺乳动物对细菌感染的重要方面的一个重要方面。在这项研究中,我们鉴定了一种赋予宿主安培抗性的特定气体表型。在侵袭性血清型ML气体分离物中将DLTA基因的失活导致噻吩酸D-丙烷化的丧失。与野生型菌株相比,发现气体DLTA突变体更容易受到放大症和溶菌酶杀伤。杀死人PMN的DLTA突变体,其大量产生AMP,得到了极大的加速。因此,噻吩酸乙酯D-丙烷化可能有助于侵入气体旁路粘膜防御的能力并产生全身感染。

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