Leveraging the unique metabolism of Megasphaera elsdenii for metabolic engineering to medium and long chain organic acids for use in jet fuels and biomaterials

利用埃氏巨型球菌的独特代谢进行代谢工程，生产用于喷气燃料和生物材料的中链和长链有机酸

• 批准号: 2335944
• 负责人: Janet Westpheling
• 金额: $ 89.99万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2027-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2335944&HistoricalAwards=false
• 关键词: Leveraging; unique; metabolism; Megasphaera; elsdenii

Bioproduction of sustainable fuels and materials, including aviation fuel, is a pressing and urgent issue. The knowledge and technologies developed in this proposal, mitigates climate change by creating carbon-neutral fuel. These biotechnologies increase rural economic development by creating a demand for sustainably grown plant biomass, decrease reliance on fossil carbon, and increase U.S. economic competitiveness. This project identifies long chain organic acid biosynthetic pathways in Megasphaera elsdenii, evaluates their activity under varying growth conditions, develops advanced genetic tools, and leverages those tools to improve the production of hexanoic acid, which is a sustainable aviation fuel precursor. The project is linked to a “women” in science program for 5th graders in the Clarke County public school system. As a new initiative, the project institutes joint training in STEM education for preservice student teachers, in conjunction with the University of Georgia College of Education. The metabolic diversity of microorganisms is only beginning to be understood and represents an untapped source of pathways to produce compounds that are difficult or impossible to engineer in existing model microbes. Megasphaera elsdenii, has the native ability to condense acetyl-CoA to efficiently generate C4 to C8 compounds at high flux and high yield, making it a compelling platform for the study of these pathways and to engineer the organism for production of fuels, chemicals and biomaterials. This project identifies long chain organic acid biosynthetic pathways in Megasphaera elsdenii, evaluates their activity under varying growth parameters, develops advanced genetic tools, and leverages those tools to improve flux to hexanoic acid, which is a sustainable aviation fuel precursor. A basic genetic toolset that allows gene deletion and heterologous expression is used to delete every nonessential gene predicted to be involved in chain elongation and analyze the impact on fermentation products to enable understanding of the genes responsible for each step. M. elsdenii has the rare ability to grow anaerobically on lactic acid as a carbon source as well as the ability to co-utilize lactic and acetic acids. The project involves physiological studies on wild type as well as mutational analysis to dissect the pathway(s) for anaerobic acetic acid utilization and lactic acid bioconversion. This project lays the foundation for engineering plant sugars to longer chain molecules and for alternate approaches to bioprocessing, such as the co-culture or sequential fermentation in which one organism converts sugars or biomass to lactic acid and an engineered M. elsdenii converts the lactic acid to a higher value product enabling strategies for a broad range of anaerobic microbial fermentations.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

可持续燃料和材料（包括航空燃料）的生物生产是一个紧迫而紧急的问题。在该提案中发展的知识和技术通过创建碳中性燃料来缓解气候变化。这些生物技术通过提出对可持续发展的植物生物量的需求，减少对化石碳的依赖并提高美国的经济竞争力来增加经济发展。该项目确定了长链有机酸生物合成途径在Megasphaera Elsdenii中，评估其在不同生长条件下的活性，开发出高级遗传工具，并利用这些工具来改善可持续的航空燃料前体的己酸盐的产生。该项目与克拉克县公立学校系统中五年级的科学计划中的“女性”有关。作为一项新倡议，该项目与佐治亚大学教育学院结合使用，为职前学生教师进行STEM教育联合培训。微生物的代谢多样性才开始被理解，并代表了未开发的途径来产生在现有模型微生物中难以或不可能设计的化合物的途径。 Megasphaera Elsdenii具有凝结乙酰辅酶A的天然能力，可在高通量和高产量下有效地生成C4至C8化合物，使其成为研究这些途径的引人注目的平台，并为生物生产燃料，化学物质和生物材料的生产生物。该项目确定了Megasphaera Elsdenii中的长链有机酸生物合成途径，评估其在不同生长参数下的活性，开发出高级遗传工具，并利用这些工具来改善己酸六氧化含量，这是一种可持续的航空燃料前体。一种允许基因缺失和异源表达的基本遗传工具集用于删除预测参与链伸长的每个非必需基因，并分析对发酵产物的影响，以使能够理解负责每个步骤的基因。 Elsdenii M. Elsdenii具有罕见的能力，可以在乳酸上厌氧作为碳源以及共同利用乳酸和乙酸的能力。该项目涉及有关野生型和突变分析的生理研究，以剖析厌氧乙酸利用和乳酸生物转化的途径。该项目奠定了工程植物糖的基础，用于更长的链分子和替代方法的生物处理方法，例如共培养或顺序发酵，其中一种有机体将糖或生物量转化为乳酸，以及工程的M. Elsdenii将乳酸转换为较高的价值产品，以使较高的策略促进anaa a anaaaaa的较高范围。该奖项反映了NSF的法定任务，并通过使用基金会的知识分子优点和更广泛的影响评估标准来评估值得支持。