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• W4281291297 abstract "Bacteriocins have been applied in the food industries and have become promising next-generation antibiotics. Some bacteria produce bacteriocins and possess immunity factors for self-protection. Nisin A, a bacteriocin produced by Lactococcus lactis, shows broad-spectrum activity. However, the evolution and cross-resistance ability of the immunity factors in some species results in reduced susceptibility to bacteriocins. Here, we investigated the elements responsible for nisin A resistance in Streptococcus mutans and their contribution to mutacins (bacteriocins produced by S. mutans) resistance. We classified the nisin A-resistance regions into six types based on the different combinations of 3 immunity factors, mutFEG, nsrX, and mutHIJ, and the presence of mutacin synthesis operon upstream of mutF. Data shows that NsrX effectively acts against nisin A but not mutacins, while the newly identified ABC transporter MutHIJ acts against three mutacins but not nisin A. Three types of MutFEG are identified based on their amino acid sequences: α (in Nsr-types C and D-I), β (in Nsr-types B and d-III), and γ (in Nsr-type E). MutFEG-α strongly contributes to mutacin I resistance, while MutFEG-β and MutFEG-γ strongly contribute to mutacin III, IIIb, and nisin A resistance. Additionally, mutFEG-like structures could be found in various streptococcal species isolated from the oral cavity of humans, chimpanzees, monkeys, bears, and hamsters. Our findings suggest that immunity factors rearrange and adapt in the presence of bacteriocins and could be transferred among closely related species, thus altering the bacterial competition within the microflora. IMPORTANCE Streptococcus mutans is an important organism of oral microbiota and associated with dental caries and systemic diseases such as stroke and endocarditis. They produce bacteriocins known as mutacins to compete with other oral bacteria and possess immune factors for self-protection. We found that the nisin A and mutacins resistance patterns correlated with the immunity components and MutFEG variants, and the genetic difference was driven by the insertion of mutacin-synthesis cassettes. Our study provides an understanding of the development of bacteriocin resistance among streptococcal species, which may alter the bacterial interaction and ecology within the oral biofilm." @default.
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• W4281291297 date "2022-06-29" @default.
• W4281291297 modified "2023-09-30" @default.
• W4281291297 title "Gene Rearrangement and Modification of Immunity Factors Are Correlated with the Insertion of Bacteriocin Cassettes in Streptococcus mutans" @default.
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• W4281291297 doi "https://doi.org/10.1128/spectrum.01806-21" @default.
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