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- W2016679122 abstract "Butanol is a promising next generation fuel and a bulk chemical precursor. Although clostridia are the primary industrial microbes for the fermentative production of 1-butanol, alternative engineered hosts have the potential to generate 1-butanol from alternative carbon feedstocks via synthetic metabolic pathways. Methylobacterium extorquens AM1, a facultative methylotrophic α-proteobacterium, is a model system for assessing the possibility of generating products such as 1-butanol from one-carbon and two-carbon feedstocks. Moreover, the core methylotrophic pathways in M. extorquens AM1 involve unusual coenzyme A (CoA)-derivative metabolites, such as crotonyl-CoA, which is a precursor for the production of 1-butanol. In this work, we engineered a modified CoA-dependent pathway in Methylobacterium extorquens AM1 to produce 1-butanol. Engineered strains displayed different 1-butanol titers using ethylamine as a substrate. A strain overexpressing Treponema denticola trans-enoyl-CoA reductase, Clostridium acetobutylicum alcohol dehydrogenase, and native crotonase was able to generate the highest 1-butanol titer (15.2 mg l-1). In vitro isotopic tracing of metabolic flux and in vivo metabolite analysis showed the accumulation of butyryl-CoA, demonstrating the functionality of the synthetic pathway and identifying targets for future improvement. We demonstrated the feasibility of using metabolic intermediates of the ethylmalonyl-CoA pathway in M. extorquens AM1 to generate value-added chemicals, with 1-butanol as the test case. This will not only establish the biotechnological potential of the ethylmalonyl-CoA pathway, but will also introduce M. extorquens AM1 as a potential platform to produce value-added chemicals." @default.
- W2016679122 created "2016-06-24" @default.
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- W2016679122 date "2014-10-21" @default.
- W2016679122 modified "2023-10-05" @default.
- W2016679122 title "Metabolic engineering of Methylobacterium extorquens AM1 for 1-butanol production" @default.
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- W2016679122 doi "https://doi.org/10.1186/s13068-014-0156-0" @default.
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