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- W2895093491 abstract "Helicobacter pylori is a flagellated bacterium of the Epsilonproteobacteria class that causes peptic ulcers. Flagellin is a primary structural protein that assembles into the flagellar filament. Flagellins from bacteria that belong to the Gammaproteobacteria and Firmicutes groups are detected by Toll-like receptor 5 (TLR5) in the host, triggering the innate immune response, and thus have been studied for the development of vaccines against diverse infections through fusion with protein antigens. However, H. pylori flagellin (hFlg) does not stimulate TLR5, allowing H. pylori to evade TLR5-mediated immune surveillance. The unresponsiveness of TLR5 to hFlg, along with the tendency of the hFlg protein to precipitate, limits the utility of hFlg for H. pylori vaccine development. Here, we report a soluble hFlg derivative protein that activates TLR5. We performed expression and purification screens with full-length and fragment hFlg proteins and identified the hypervariable domains as the soluble part of hFlg. The hypervariable domains of hFlg were engineered into a TLR5 agonist through fusion with the TLR5-activating Bacillus subtilis flagellin. Furthermore, based on comparative sequence and mutation analyses, we reveal that hFlg evolved to evade TLR5 detection by modifying residues that correspond to a TLR5-activation hot spot." @default.
- W2895093491 created "2018-10-12" @default.
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- W2895093491 date "2018-11-01" @default.
- W2895093491 modified "2023-10-05" @default.
- W2895093491 title "Helicobacter pylori flagellin: TLR5 evasion and fusion-based conversion into a TLR5 agonist" @default.
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- W2895093491 doi "https://doi.org/10.1016/j.bbrc.2018.09.179" @default.
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