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• W2107396465 abstract "Bacillus subtilis is widely used in agriculture and industrial biotechnology; however, cell autolysis significantly decreases its yield in liquid cultures. Numerous factors mediate the lysis of B. subtilis, such as cannibalism factors, prophages, and peptidoglycan (PG) hydrolases. The aim of this work was to use molecular genetic techniques to develop a new strategy to prevent cell lysis and enhance biomass as well as the production of recombinant proteins. Five genes or genetic elements representing three different functional categories were studied as follows: lytC encoding PG hydrolases, the prophage genes xpf and yqxG-yqxH-cwlA (yGlA), and skfA and sdpC that encode cannibalism factors. Cell lysis was reduced and biomass was enhanced by deleting individually skfA, sdpC, xpf, and lytC. We constructed the multiple deletion mutant LM2531 (skfA sdpC lytC xpf) and found that after 4 h of culture, its biomass yield was significantly increased compared with that of prototypical B. subtilis 168 (wild-type) strain and that 15% and 92% of the cells were lysed in cultures of LM2531 and wild-type, respectively. Moreover, two expression vectors were constructed for producing recombinant proteins (β-galactosidase and nattokinase) under the control of the P43 promoter. Cultures of LM2531 and wild-type transformants produced 13741 U/ml and 7991 U/ml of intracellular β-galactosidase, respectively (1.72-fold increase). Further, the level of secreted nattokinase produced by strain LM2531 increased by 2.6-fold compared with wild-type (5226 IU/ml vs. 2028 IU/ml, respectively). Our novel, systematic multigene deletion approach designed to inhibit cell lysis significantly increased the biomass yield and the production of recombinant proteins by B. subtili s. These findings show promise for guiding efforts to manipulate the genomes of other B. subtilis strains that are used for industrial purposes." @default.
• W2107396465 created "2016-06-24" @default.
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• W2107396465 date "2014-08-31" @default.
• W2107396465 modified "2023-10-15" @default.
• W2107396465 title "Deleting multiple lytic genes enhances biomass yield and production of recombinant proteins by Bacillus subtilis" @default.
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• W2107396465 doi "https://doi.org/10.1186/s12934-014-0129-9" @default.
• W2107396465 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4243946" @default.
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• W2107396465 hasPublicationYear "2014" @default.
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