Production of d-lactate from glucose using Klebsiella pneumoniae mutants
Feng,Xinjun1,2; Jiang,Liqun2; Han,Xiaojuan1; Liu,Xiutao1,3; Zhao,Zhiqiang1,3; Liu,Huizhou1; Xian,Mo1; Zhao,Guang1
Source PublicationMicrobial Cell Factories
AbstractAbstractBackgroundd-Lactate is a valued chemical which can be produced by some bacteria including Klebsiella pneumoniae. However, only a few studies have focused on K. pneumoniae for d-lactate production with a significant amount of by-products, which complicated the purification process and decreased the yield of d-lactate.ResultsBased on the redirection of carbon towards by-product formation, the effects of single-gene and multiple-gene deletions in K. pneumoniae on d-lactate production from glucose via acetolactate synthase (budB), acetate kinase (ackA), and alcohol dehydrogenase (adhE) were tested. Klebsiella pneumoniae mutants had different production behaviours. The accumulation of the main by-products was decreased in the mutants. The triple mutant strain had the most powerful ability to produce optically pure d-lactate from glucose, and was tested with xylose and arabinose as carbon sources. Fed-batch fermentation was also carried out under various aeration rates, and the strain accumulated 125.1?g/L d-lactate with a yield of 0.91?g/g glucose at 2.5 vvm.ConclusionsKnocking out by-product synthesis genes had a remarkable influence on the production and yield of d-lactate. This study demonstrated, for the first time, that K. pneumoniae has great potential to convert monosaccharides into d-lactate. The results provide new insights for industrial production of d-lactate by K. pneumoniae.
Keywordd-Lactate Acetolactate synthase Acetate kinase Alcohol dehydrogenase Klebsiella pneumoniae
WOS IDBMC:10.1186/s12934-017-0822-6
PublisherBioMed Central
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Document Type期刊论文
Corresponding AuthorLiu,Huizhou; Xian,Mo; Zhao,Guang
Recommended Citation
GB/T 7714
Feng,Xinjun,Jiang,Liqun,Han,Xiaojuan,et al. Production of d-lactate from glucose using Klebsiella pneumoniae mutants[J]. Microbial Cell Factories,2017,16(1).
APA Feng,Xinjun.,Jiang,Liqun.,Han,Xiaojuan.,Liu,Xiutao.,Zhao,Zhiqiang.,...&Zhao,Guang.(2017).Production of d-lactate from glucose using Klebsiella pneumoniae mutants.Microbial Cell Factories,16(1).
MLA Feng,Xinjun,et al."Production of d-lactate from glucose using Klebsiella pneumoniae mutants".Microbial Cell Factories 16.1(2017).
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