Metabolic engineering of Zymomonas mobilis for 2,3-butanediol production from lignocellulosic biomass sugars

Yang, Shihui; Mohagheghi, Ali; Franden, Mary Ann; Chou, Yat-Chen; Chen, Xiaowen; Dowe, Nancy; Himmel, Michael E.; Zhang, Min

doi:10.1186/s13068-016-0606-y

Title: Metabolic engineering of Zymomonas mobilis for 2,3-butanediol production from lignocellulosic biomass sugars

Journal Article · Fri Sep 02 00:00:00 EDT 2016 · Biotechnology for Biofuels

DOI:https://doi.org/10.1186/s13068-016-0606-y· OSTI ID:1618645

; Mohagheghi, Ali; Franden, Mary Ann; Chou, Yat-Chen; Chen, Xiaowen; Dowe, Nancy; Himmel, Michael E.; Zhang, Min

To develop pathways for advanced biofuel production, and to understand the impact of host metabolism and environmental conditions on heterologous pathway engineering for economic advanced biofuels production from biomass, we seek to redirect the carbon flow of the model ethanologen Zymomonas mobilis to produce desirable hydrocarbon intermediate 2,3-butanediol (2,3-BDO). 2,3-BDO is a bulk chemical building block, and can be upgraded in high yields to gasoline, diesel, and jet fuel. 2,3-BDO biosynthesis pathways from various bacterial species were examined, which include three genes encoding acetolactate synthase, acetolactate decarboxylase, and butanediol dehydrogenase. Bioinformatics analysis was carried out to pinpoint potential bottlenecks for high 2,3-BDO production. Different combinations of 2,3-BDO biosynthesis metabolic pathways using genes from different bacterial species have been constructed. Our results demonstrated that carbon flux can be deviated from ethanol production into 2,3-BDO biosynthesis, and all three heterologous genes are essential to efficiently redirect pyruvate from ethanol production for high 2,3-BDO production in Z. mobilis. The down-selection of best gene combinations up to now enabled Z. mobilis to reach the 2,3-BDO production of more than 10 g/L from glucose and xylose, as well as mixed C6/C5 sugar streams derived from the deacetylation and mechanical refining process. In conclusion, this study confirms the value of integrating bioinformatics analysis and systems biology data during metabolic engineering endeavors, provides guidance for value-added chemical production in Z. mobilis, and reveals the interactions between host metabolism, oxygen levels, and a heterologous 2,3-BDO biosynthesis pathway. Taken together, this work provides guidance for future metabolic engineering efforts aimed at boosting 2,3-BDO titer anaerobically.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Bioenergy Technologies Office (BETO); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Bioenergy Technologies Office (BETO)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1618645

Alternate ID(s):: OSTI ID: 1325930

Report Number(s):: NREL/JA-5100-67146; 189; PII: 606

Journal Information:: Biotechnology for Biofuels, Journal Name: Biotechnology for Biofuels Vol. 9 Journal Issue: 1; ISSN 1754-6834

Publisher:: Springer Science + Business MediaCopyright Statement

Country of Publication:: Netherlands

Language:: English

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Cited by: 98 works

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