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- W2407285168 abstract "Brucella spp. avoid host immune recognition and thus, weaken the immune response to infection. The Toll/interleukin-1 receptor (TIR) domain-containing protein (TcpB/Btp1) of Brucella spp. is thought to be involved in blocking host innate immune responses by binding to adaptors downstream of Toll-like receptors. In this study, based on the observation that TcpB binds to the host target proteins, MAL, through the TIR domain, we examined decoy peptides from TcpB TIR domains and found that TB-8 and TB-9 substantially inhibit lipopolysaccharide (LPS)-induced signaling in vitro and in vivo. Both these peptides share a common loop, the DD loop, indicating a novel structural region mediating TIR interactions. The inhibition of LPS signaling by TB-8 and TB-9 shows no preference to MyD88-dependent cytokines, such as TNF-α and IL-1β or TRIF-dependent cytokines including IFN-β and IL-6. Furthermore, these two peptides rescue the virulence of Brucella ΔtcpB mutants at the cellular level, indicating key roles of the DD loop in Brucella pathogenesis. In conclusion, identification of inhibitors from the bacterial TIR domains is helpful not only for illustrating interacting mechanisms between TIR domains and bacterial pathogenesis, but also for developing novel signaling inhibitors and therapeutics for human inflammatory diseases." @default.
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- W2407285168 date "2016-09-01" @default.
- W2407285168 modified "2023-10-16" @default.
- W2407285168 title "Inhibition of TLR4 signaling by Brucella TIR-containing protein TcpB-derived decoy peptides" @default.
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- W2407285168 doi "https://doi.org/10.1016/j.ijmm.2016.05.003" @default.
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