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• W4384497715 abstract "Aim: Lactococcal skunaviruses are diverse and problematic in the industrial dairy environment. Host recognition involves the specific interaction of phage-encoded proteins with saccharidic host cell surface structures. Lactococcal plasmid pEPS6073 encodes genes required for the biosynthesis of a cell surface-associated exopolysaccharide (EPS), designated 6073-like. Here, the impact of this EPS on Skunavirus sensitivity was assessed. Methods: Conjugal transfer of pEPS6073 into two model strains followed by phage plaque assays and adsorption assays were performed to assess its effect on phage sensitivity. Phage distal tail proteins were analyzed bioinformatically using HHpred and modeling with AlphaFold. Construction of recombinant phages carrying evolved Dits was performed by supplying a plasmid-encoded template for homologous recombination. Results: pEPS6073 confers resistance against a subset of skunaviruses via adsorption inhibition. IFF collection skunaviruses that infect strains encoding the 6073-like eps gene cluster carry insertions in their distal tail protein-encoding (dit ) genes that result in longer Dit proteins (so-called evolved Dits), which encode carbohydrate-binding domains. Three skunaviruses with classical Dits (no insertion) were unable to fully infect their hosts following the conjugal introduction of pEPS6073, showing reductions in both adsorption and efficiency of plaquing. Cloning the evolved Dit into these phages enabled full infectivity on their host strains, both wild type and transconjugant carrying pEPS6073, with recombinant phages adsorbing slightly better to the EPS+ host than wild type. Conclusion: The 6073-like EPS potentially occludes the phage receptor for skunaviruses that encode a classical Dit protein. Skunaviruses that infect strains encoding the 6073-like EPS harbor evolved Dits, which likely help promote phage adsorption rather than just allow the phage to circumvent the putative EPS barrier. This work furthers our knowledge of phage-host interactions in Lactococcus and proposes a role for insertions in the Dit proteins of a subset of skunaviruses." @default.
• W4384497715 created "2023-07-18" @default.
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• W4384497715 date "2023-07-18" @default.
• W4384497715 modified "2023-09-27" @default.
• W4384497715 title "Evolved distal tail protein of skunaviruses facilitates adsorption to exopolysaccharide-encoding lactococci" @default.
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• W4384497715 doi "https://doi.org/10.20517/mrr.2023.29" @default.
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