Genetic engineering of Bacillus sp. and fermentation process optimizing for diacetyl production
•Deletion of pta gene leading to diacetyl increase markedly in Bacillus sp. DL01-ΔalsD.•Diacetyl biosynthetic flux amplified by overexpressing ALS from Bacillus subtilis 168.•Ferment parameters optimized by BP neural network for increasing diacetyl production. Diacetyl, an important flavor extensive...
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Published in | Journal of biotechnology Vol. 301; pp. 2 - 10 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
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Elsevier B.V
10.08.2019
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Abstract | •Deletion of pta gene leading to diacetyl increase markedly in Bacillus sp. DL01-ΔalsD.•Diacetyl biosynthetic flux amplified by overexpressing ALS from Bacillus subtilis 168.•Ferment parameters optimized by BP neural network for increasing diacetyl production.
Diacetyl, an important flavor extensively used in the food industry, can be produced from the non-enzymatic oxidative decarboxylation of α-acetolactate in bacteria fermentation. In previous work, we obtained a strain of Bacillus sp. DL01-ΔalsD with low diacetyl accumulation. The strain was engineered and optimized for improving the production of diacetyl in this study. First, deletion of the gene encoding phosphotransacetylase (pta), by homologous recombination with high temperature sensitive shuttle plasmid vector pKS1, led to a reduction of acetate and 130% increase of diacetyl production in B. sp. DL01-ΔalsD-Δpta. Then overexpression of α-acetolactate synthase (ALS) from B. subtilis 168 in B. sp. DL01-ΔalsD-Δpta resulted in efficient diacetyl production with a titer of 5.43 g/L. To further increase diacetyl production, single factor and orthogonal experimental data were used to predict the optimal fermentation conditions by Back Propagation neural network. Optimal value of KLa (Dissolved oxygen volume coefficient) was 12.4 h−1 with fermentation parameters of aeration rate 0.66 vvm, agitation speed 179 rpm and temperature 35.7 ℃. A titer of 11.18 g/L diacetyl, the highest reported diacetyl production, was achieved by fed-batch fermentation at the optimal condition using the metabolic engineered strain of B. sp. DL01-ΔalsD-Δpta-als168. These results are of great importance as a new way for the efficient production of diacetyl by food-safety bacteria. |
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AbstractList | •Deletion of pta gene leading to diacetyl increase markedly in Bacillus sp. DL01-ΔalsD.•Diacetyl biosynthetic flux amplified by overexpressing ALS from Bacillus subtilis 168.•Ferment parameters optimized by BP neural network for increasing diacetyl production.
Diacetyl, an important flavor extensively used in the food industry, can be produced from the non-enzymatic oxidative decarboxylation of α-acetolactate in bacteria fermentation. In previous work, we obtained a strain of Bacillus sp. DL01-ΔalsD with low diacetyl accumulation. The strain was engineered and optimized for improving the production of diacetyl in this study. First, deletion of the gene encoding phosphotransacetylase (pta), by homologous recombination with high temperature sensitive shuttle plasmid vector pKS1, led to a reduction of acetate and 130% increase of diacetyl production in B. sp. DL01-ΔalsD-Δpta. Then overexpression of α-acetolactate synthase (ALS) from B. subtilis 168 in B. sp. DL01-ΔalsD-Δpta resulted in efficient diacetyl production with a titer of 5.43 g/L. To further increase diacetyl production, single factor and orthogonal experimental data were used to predict the optimal fermentation conditions by Back Propagation neural network. Optimal value of KLa (Dissolved oxygen volume coefficient) was 12.4 h−1 with fermentation parameters of aeration rate 0.66 vvm, agitation speed 179 rpm and temperature 35.7 ℃. A titer of 11.18 g/L diacetyl, the highest reported diacetyl production, was achieved by fed-batch fermentation at the optimal condition using the metabolic engineered strain of B. sp. DL01-ΔalsD-Δpta-als168. These results are of great importance as a new way for the efficient production of diacetyl by food-safety bacteria. Diacetyl, an important flavor extensively used in the food industry, can be produced from the non-enzymatic oxidative decarboxylation of α-acetolactate in bacteria fermentation. In previous work, we obtained a strain of Bacillus sp. DL01-ΔalsD with low diacetyl accumulation. The strain was engineered and optimized for improving the production of diacetyl in this study. First, deletion of the gene encoding phosphotransacetylase (pta), by homologous recombination with high temperature sensitive shuttle plasmid vector pKS1, led to a reduction of acetate and 130% increase of diacetyl production in B. sp. DL01-ΔalsD-Δpta. Then overexpression of α-acetolactate synthase (ALS) from B. subtilis 168 in B. sp. DL01-ΔalsD-Δpta resulted in efficient diacetyl production with a titer of 5.43 g/L. To further increase diacetyl production, single factor and orthogonal experimental data were used to predict the optimal fermentation conditions by Back Propagation neural network. Optimal value of K a (Dissolved oxygen volume coefficient) was 12.4 h with fermentation parameters of aeration rate 0.66 vvm, agitation speed 179 rpm and temperature 35.7 ℃. A titer of 11.18 g/L diacetyl, the highest reported diacetyl production, was achieved by fed-batch fermentation at the optimal condition using the metabolic engineered strain of B. sp. DL01-ΔalsD-Δpta-als These results are of great importance as a new way for the efficient production of diacetyl by food-safety bacteria. |
Author | Zheng, Shihao Zhang, Yue Sun, Wenhui Wang, Yuepeng Bao, Yongming |
Author_xml | – sequence: 1 givenname: Yuepeng surname: Wang fullname: Wang, Yuepeng organization: School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024, China – sequence: 2 givenname: Wenhui surname: Sun fullname: Sun, Wenhui organization: School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024, China – sequence: 3 givenname: Shihao surname: Zheng fullname: Zheng, Shihao organization: School of Food and Environmental Science and Engineering, Dalian University of Technology, Panjin, 124221, China – sequence: 4 givenname: Yue surname: Zhang fullname: Zhang, Yue organization: School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024, China – sequence: 5 givenname: Yongming surname: Bao fullname: Bao, Yongming email: biosci@dlut.edu.cn organization: School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024, China |
BackLink | https://www.ncbi.nlm.nih.gov/pubmed/31158408$$D View this record in MEDLINE/PubMed |
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Keywords | Phosphotransacetylase BP neural network α-Acetolactate synthase Diacetyl Bacillus Fed-batch fermentation |
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Snippet | •Deletion of pta gene leading to diacetyl increase markedly in Bacillus sp. DL01-ΔalsD.•Diacetyl biosynthetic flux amplified by overexpressing ALS from... Diacetyl, an important flavor extensively used in the food industry, can be produced from the non-enzymatic oxidative decarboxylation of α-acetolactate in... |
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SubjectTerms | Acetolactate Synthase - genetics Acetolactate Synthase - metabolism Bacillus Bacillus - enzymology Bacillus - genetics Bacillus - metabolism Bacterial Proteins - genetics Bacterial Proteins - metabolism Bioreactors - microbiology BP neural network Diacetyl Diacetyl - analysis Diacetyl - metabolism Fed-batch fermentation Fermentation Metabolic Engineering - methods Phosphate Acetyltransferase - genetics Phosphate Acetyltransferase - metabolism Phosphotransacetylase Recombinant Proteins - genetics Recombinant Proteins - metabolism α-Acetolactate synthase |
Title | Genetic engineering of Bacillus sp. and fermentation process optimizing for diacetyl production |
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