1887

Abstract

Surface proteins of probiotic microbes, including and , are believed to promote retention in the gut and mediate host–bacterial communications. Sortase, an enzyme that covalently couples a subset of extracellular proteins containing an LPXTG motif to the cell surface, is of particular interest in characterizing bacterial adherence and communication with the mucosal immune system. A sortase gene, , was identified in NCFM (LBA1244) and ATCC 33323 (LGAS_0825). Additionally, eight and six intact sortase-dependent proteins were predicted in and , respectively. Due to the role of sortase in coupling these proteins to the cell wall, Δ deletion mutants of and were created using the -based counterselective gene replacement system. Inactivation of sortase did not cause significant alteration in growth or survival in simulated gastrointestinal juices. Meanwhile, both Δ mutants showed decreased adhesion to porcine mucin Murine dendritic cells exposed to the Δ mutant of or induced lower levels of pro-inflammatory cytokines TNF-α and IL-12, respectively, compared with the parent strains. co-colonization of the Δ mutant and its parent strain in germ-free 129S6/SvEv mice resulted in a significant one-log reduction of the Δ mutant population. Additionally, a similar reduction of the Δ mutant was observed in the caecum. This study shows for the first time that sortase-dependent proteins contribute to gut retention of probiotic microbes in the gastrointestinal tract.

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2015-02-01
2020-01-26
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