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• W2080004865 abstract "Nisin has been widely used in the food industry as a safe and natural preservative to increase the shelf time of many foods. In this study, genome shuffling was applied to improve nisin Z production of Lactococcus lactis ssp. lactis YF11 (YF11) via recursive protoplast fusion. Ultraviolet irradiation and diethyl sulfate mutagenesis were used to generate parental strains for genome shuffling. After 4 rounds of genome shuffling, the best-performing strain F44 was obtained, which showed dramatic improvements in tolerance to both glucose (ranging from 8 to 15% (wt/vol) and nisin (ranging from 5,000 to 14,000 IU/mL). Fed-batch fermentation showed that the nisin titer of F44 was up to 4,023 IU/mL, which was 2.4 times that of the starting strain YF11. Field emission scanning electron microscope micrographs of YF11 and F44 revealed the apparent differences in cell morphology. Whereas YF11 displayed long and thin cell morphology, F44 cells were short and thick and with a raised surface in the middle of the cell. With the increasing glucose and nisin content in the medium, cells of both YF11 and F44 tended to become shrunken; however, alterations in YF11 cells were more pronounced than those of F44 cells, especially when cultured in tolerance medium containing both nisin and glucose. Nuclear magnetic resonance analysis demonstrated that the structure of nisin from YF11 and F44 was the same. Expression profiling of nisin synthesis related genes by real-time quantitative PCR showed that the transcription level of nisin structural gene nisZ and immunity gene nisI of F44 was 48 and 130% higher than that of the starting strain YF11, respectively. These results could provide valuable insights into the molecular basis underlying the nisin overproduction mechanism in L. lactis, thus facilitating the future construction of industrial strains for nisin production." @default.
• W2080004865 created "2016-06-24" @default.
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• W2080004865 date "2014-05-01" @default.
• W2080004865 modified "2023-09-25" @default.
• W2080004865 title "Genome shuffling of Lactococcus lactis subspecies lactis YF11 for improving nisin Z production and comparative analysis" @default.
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• W2080004865 doi "https://doi.org/10.3168/jds.2013-7238" @default.
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