Evaluation of Genetic Manipulation Strategies on d-Lactate Production by Escherichia coli View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2011-03

AUTHORS

Li Zhou, Zhi-Rui Zuo, Xian-Zhong Chen, Dan-Dan Niu, Kang-Ming Tian, Bernard A. Prior, Wei Shen, Gui-Yang Shi, Suren Singh, Zheng-Xiang Wang

ABSTRACT

In order to rationally manipulate the cellular metabolism of Escherichia coli for D: -lactate production, single-gene and multiple-gene deletions with mutations in acetate kinase (ackA), phosphotransacetylase (pta), phosphoenolpyruvate synthase (pps), pyruvate formate lyase (pflB), FAD-binding D-lactate dehydrogenase (dld), pyruvate oxidase (poxB), alcohol dehydrogenase (adhE), and fumarate reductase (frdA) were tested for their effects in two-phase fermentations (aerobic growth and oxygen-limited production). Lactate yield and productivity could be improved by single-gene deletions of ackA, pta, pflB, dld, poxB, and frdA in the wild type E. coli strain but were unfavorably affected by deletions of pps and adhE. However, fermentation experiments with multiple-gene mutant strains showed that deletion of pps in addition to ackA-pta deletions had no effect on lactate production, whereas the additional deletion of adhE in E. coli B0013-050 (ackA-pta pps pflB dld poxB) increased lactate yield. Deletion of all eight genes in E. coli B0013 to produce B0013-070 (ackA-pta pps pflB dld poxB adhE frdA) increased lactate yield and productivity by twofold and reduced yields of acetate, succinate, formate, and ethanol by 95, 89, 100, and 93%, respectively. When tested in a bioreactor, E. coli B0013-070 produced 125 g/l D-lactate with an increased oxygen-limited lactate productivity of 0.61 g/g h (2.1-fold greater than E. coli B0013). These kinetic properties of D-lactate production are among the highest reported and the results have revealed which genetic manipulations improved D-lactate production by E. coli. More... »

PAGES

981-989

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00284-010-9817-9

DOI

http://dx.doi.org/10.1007/s00284-010-9817-9

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1044024593

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/21086129


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30 schema:description In order to rationally manipulate the cellular metabolism of Escherichia coli for D: -lactate production, single-gene and multiple-gene deletions with mutations in acetate kinase (ackA), phosphotransacetylase (pta), phosphoenolpyruvate synthase (pps), pyruvate formate lyase (pflB), FAD-binding D-lactate dehydrogenase (dld), pyruvate oxidase (poxB), alcohol dehydrogenase (adhE), and fumarate reductase (frdA) were tested for their effects in two-phase fermentations (aerobic growth and oxygen-limited production). Lactate yield and productivity could be improved by single-gene deletions of ackA, pta, pflB, dld, poxB, and frdA in the wild type E. coli strain but were unfavorably affected by deletions of pps and adhE. However, fermentation experiments with multiple-gene mutant strains showed that deletion of pps in addition to ackA-pta deletions had no effect on lactate production, whereas the additional deletion of adhE in E. coli B0013-050 (ackA-pta pps pflB dld poxB) increased lactate yield. Deletion of all eight genes in E. coli B0013 to produce B0013-070 (ackA-pta pps pflB dld poxB adhE frdA) increased lactate yield and productivity by twofold and reduced yields of acetate, succinate, formate, and ethanol by 95, 89, 100, and 93%, respectively. When tested in a bioreactor, E. coli B0013-070 produced 125 g/l D-lactate with an increased oxygen-limited lactate productivity of 0.61 g/g h (2.1-fold greater than E. coli B0013). These kinetic properties of D-lactate production are among the highest reported and the results have revealed which genetic manipulations improved D-lactate production by E. coli.
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