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Huen, Jennifer; Yan, Zhun; Iwashkiw, Jeremy; Dubey, Shraddha; Gimenez, Maria C; Ortiz, Maria E; Patel, Saumil V; Jones, Michael D; Riazi, Ali; Terebiznik, Mauricio; Babaei, Saeid; Shahinas, Dea
Frontiers in microbiology, 11/2019, Letnik: 10Journal Article
The enteric pathogen, is a major cause of human gastroenteritis globally and with increasing bacterial resistance to antibiotics, alternative solutions are urgently needed. Single domain antibodies (sdAbs), the smallest antibody fragments that retain antigen binding specificity and affinity, are derived from variable heavy-chain only fragments (VHH) of camelid heavy-chain-only immunoglobulins. SdAbs typically contain a single disulfide bond simplifying recombinant protein production in microbial systems. These factors make sdAbs ideally suited for the development of effective anti-bacterial therapeutics. To this end, we generated an anti-Salmonella VHH library from which we screened for high affinity sdAbs. We present a novel sdAb (Abi-Se07) that targets the Salmonella virulence factor, FliC, required for bacterial motility and invasion of host cells. We demonstrate that Abi-Se07 bound FliC with a of 16.2 ± 0.1 nM. In addition, Abi-Se07 exhibited cross-serovar binding to whole cells of serovar Typhimurium, Heidelberg, and Hadar. Abi-Se07 significantly inhibited bacterial motility and significantly reduced colonization in a more native environment of chicken jejunum epithelium. Taken together, we have identified a novel anti-Salmonella sdAb and discuss future efforts toward therapeutic development.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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