Influence of Shigella flexneri 2a O Antigen Acetylation on Its Bacteriophage Sf6 Receptor Activity and Bacterial Interaction with Human Cells,Journal of Bacteriology

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Influence of Shigella flexneri 2a O Antigen Acetylation on Its Bacteriophage Sf6 Receptor Activity and Bacterial Interaction with Human Cells
Journal of Bacteriology ( IF 3.2 ) Pub Date : 2020-11-19 , DOI: 10.1128/jb.00363-20
Min Yan Teh ₁ , Axel Furevi ₂ , Göran Widmalm ₂ , Renato Morona ₁

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Shigella flexneri is a major causative agent of bacillary dysentery in developing countries, where serotype 2a₂ is the prevalent strain. To date, approximately 30 serotypes have been identified for S. flexneri, and the major contribution to the emergence of new serotypes is chemical modifications of the lipopolysaccharide (LPS) component O antigen (Oag). Glucosylation, O-acetylation, and phosphoethanolamine (PEtN) modifications increase the Oag diversity, providing benefits to S. flexneri. LPS Oag acts as a primary receptor for bacteriophage Sf6, which infects only a limited range of S. flexneri serotypes (Y and X). It uses its tailspike protein (Sf6TSP) to establish initial interaction with LPS Oags that it then hydrolyzes. Currently, there is a lack of comprehensive study on the parent and serotype variant strains from the same genetic background and an understanding of the importance of LPS Oag O-acetylations. Therefore, a set of isogenic strains (based on S. flexneri 2457T [2a₂]) with deletions of different Oag modification genes (oacB, oacD, and gtrII) that resemble different naturally occurring serotype Y and 2a strains was created. The impacts of these Oag modifications on S. flexneri sensitivity to Sf6 and the pathogenesis-related properties were then compared. We found that Sf6TSP can hydrolyze serotype 2a LPS Oag, identified that 3/4-O-acetylation is essential for resistance of serotype 2a strains to Sf6, and showed that serotype 2a strains have better invasion ability. Lastly, we revealed two new serotype conversions for S. flexneri, thereby contributing to understanding the evolution of this important human pathogen.

更新日期：2020-11-19

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