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T6SS (type VI secretion system) is a type of nano-syringe that exists in APEC (avian pathogenic  Escherichia coli ). Hcp (haemolysin-coregulated protein) of T6SS participates in the regulation of virulence during APEC infection. However, whether  hcp  plays a role in bacterial colonization by expression in host cells remains unclear. In this study, we analysed the biological characteristics of the mutant  hcp2b  strain. Our results showed that the  hcp2b  gene was involved in the regulation of bacterial motility, biofilm formation, anti-serum and anti-oxidative stress. Moreover, our data indicate that the colonization of the  hcp2b  mutation strain (Δ hcp2b ) in the lung, liver and kidney of chickens decreased significantly. Hence, overexpression of Hcp2b protein in DF-1 cells was used to analyse the effect of Hcp2b on colonization of APEC. Proteomics analysis showed that overexpression of Hcp2b induced differentially expressed proteins in DF-1 cells (230 were significantly upregulated and 96 were significantly downregulated) and differentially expressed proteins were enriched in keratin filament. In conclusion, our data indicated that  hcp2b  promoted the colonization of APEC by affecting the expression of keratin filament.

Hcp2b of T6SS affects colonization of avian pathogenic Escherichia coli and host keratin filament expression