期刊
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
卷 87, 期 21, 页码 -出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/AEM.00299-21
关键词
Escherichia coli; mixed-acid fermentation; bioengineering; formate hydrogenlyase; hydrogen-dependent carbon dioxide reductase; carbon dioxide hydrogenation; pressurized bioreactor; carbon capture; fermentation; genetic engineering
资金
- Biotechnology and Biological Sciences Research Council (BBSRC) [BB/S000666/1]
- BBSRC [BB/T508743/1]
- Engineering and Physical Sciences Research Council (EPSRC)
- BBSRC [BB/S000666/1, BB/T508743/1] Funding Source: UKRI
Escherichia coli, a Gram-negative bacterium, naturally synthesizes formate hydrogenlyase (FHL-1) to disproportion formate into H-2 and CO2 during anaerobic conditions. By engineering an E. coli host strain to continuously produce formic acid from H-2 and CO2, incorporating tungsten in place of molybdenum in FHL-1 demonstrated potential as a hydrogen-dependent CO2 reductase (HDCR) for bio-based carbon capture and storage.
Escherichia coli is a Gram-negative bacterium that is a workhorse for biotechnology. The organism naturally performs a mixed-acid fermentation under anaerobic conditions where it synthesizes formate hydrogenlyase (FHL-1). The physiological role of the enzyme is the disproportionation of formate into H-2 and CO2. However, the enzyme has been observed to catalyze hydrogenation of CO2 given the correct conditions, and so it has possibilities in bio-based carbon capture and storage if it can be harnessed as a hydrogen-dependent CO2 reductase (HDCR). In this study, an E. coli host strain was engineered for the continuous production of formic acid from H-2 and CO2 during bacterial growth in a pressurized batch bioreactor. Incorporation of tungsten, in place of molybdenum, in FHL-1 helped to impose a degree of catalytic bias on the enzyme. This work demonstrates that it is possible to couple cell growth to simultaneous, unidirectional formate production from carbon dioxide and develops a process for growth under pressurized gases. IMPORTANCE Greenhouse gas emissions, including waste carbon dioxide, are contributing to global climate change. A basket of solutions is needed to steadily reduce emissions, and one approach is bio-based carbon capture and storage. Here, we present our latest work on harnessing a novel biological solution for carbon capture. The Escherichia coli formate hydrogenlyase (FHL-1) was engineered to be constitutively expressed. Anaerobic growth under pressurized H-2 and CO2 gases was established, and aqueous formic acid was produced as a result. Incorporation of tungsten into the enzyme in place of molybdenum proved useful in poising FHL-1 as a hydrogen-dependent CO2 reductase (HDCR).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据