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- W3108540701 abstract "Bacillus amyloliquefaciens is a major industrial host for extracellular protein production, with great potential in the enzyme industry. However, the strain has accelerated the autolysis drawback in the process of secreting extracellular enzymes, which can significantly lower the density of cells and decrease the product yield. To identify target genes, we employed comparative transcriptome sequencing and KEGG analysis to indicate the increased expression of peptidoglycan hydrolase-regulated genes from the exponential phase to the apoptotic phase of growth; this was further confirmed by quantitative RT-PCR. By deleting lytD, lytE, and sigD genes, cell lysis was reduced and the production of acid-stable Bacillus licheniformis alpha-amylase was enhanced. After 36 h of culture, multiple deletion mutant BA ΔSDE had significantly more viable cells compared to the control strain BA Δupp, and flow cytometry analysis indicated that 48.43% and 64.03% of the cells were lysed in cultures of BA ΔSDE and BA Δupp, respectively. In a 2-L fed-batch fermenter, viable cell number of the triple deletion mutant BA ΔSDE increased by 2.79 Log/cfu/mL, and the activity of acid-stable alpha-amylase increased by 48.4%, compared to BA Δupp. Systematic multiple peptidoglycan hydrolases deletion relieved the autolysis and increased the production of industrial enzymes, and provided a useful strategy for guiding efforts to manipulate the genomes of other B. amyloliquefaciens used for chassis host." @default.
- W3108540701 created "2020-12-07" @default.
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- W3108540701 date "2021-01-01" @default.
- W3108540701 modified "2023-10-18" @default.
- W3108540701 title "Reducing the cell lysis to enhance yield of acid-stable alpha amylase by deletion of multiple peptidoglycan hydrolase-related genes in Bacillus amyloliquefaciens" @default.
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- W3108540701 doi "https://doi.org/10.1016/j.ijbiomac.2020.11.193" @default.
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