Engineering of glycerol utilization in Gluconobacter oxydans 621H for biocatalyst preparation in a low-cost way

Autor: Jinxin Yan, Jing Xu, Menghao Cao, Zhong Li, Chengpeng Xu, Xinyu Wang, Chunyu Yang, Ping Xu, Chao Gao, Cuiqing Ma
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Microbial Cell Factories, Vol 17, Iss 1, Pp 1-11 (2018)
Druh dokumentu: article
ISSN: 1475-2859
27334473
DOI: 10.1186/s12934-018-1001-0
Popis: Abstract Background Whole cells of Gluconobacter oxydans are widely used in various biocatalytic processes. Sorbitol at high concentrations is commonly used in complex media to prepare biocatalysts. Exploiting an alternative process for preparation of biocatalysts with low cost substrates is of importance for industrial applications. Results G. oxydans 621H was confirmed to have the ability to grow in mineral salts medium with glycerol, an inevitable waste generated from industry of biofuels, as the sole carbon source. Based on the glycerol utilization mechanism elucidated in this study, the major polyol dehydrogenase (GOX0854) and the membrane-bound alcohol dehydrogenase (GOX1068) can competitively utilize glycerol but play no obvious roles in the biocatalyst preparation. Thus, the genes related to these two enzymes were deleted. Whole cells of G. oxydans ∆GOX1068∆GOX0854 can be prepared from glycerol with a 2.4-fold higher biomass yield than that of G. oxydans 621H. Using whole cells of G. oxydans ∆GOX1068∆GOX0854 as the biocatalyst, 61.6 g L−1 xylonate was produced from 58.4 g L−1 xylose at a yield of 1.05 g g−1. Conclusion This process is an example of efficient preparation of whole cells of G. oxydans with reduced cost. Besides xylonate production from xylose, other biocatalytic processes might also be developed using whole cells of metabolic engineered G. oxydans prepared from glycerol.
Databáze: Directory of Open Access Journals
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