甲酸微生物转化研究进展

Research progress of formic acid biotransformation

“碳达峰、碳中和”是我国提出的重要战略目标。到2060年,在保持我国经济中高速增长的前提下,要实现生产、生活等各类活动排放的二氧化碳等温室气体,与生物固定转化及其他技术固存的二氧化碳量互相抵消,即“排放”与“吸收利用”达到平衡,挑战巨大。如何开展二氧化碳的高效减排、捕集和利用,促进双碳目标的实现,已经成为科研界和产业界共同关注的重大课题和迫切任务。目前已发现6条天然的固碳途径,但普遍存在固碳效率低、改造困难等问题。近年来,随着电化学技术的发展,二氧化碳化学转化为甲酸的技术已日渐成熟,以甲酸为底物的生物转化成为生物固碳领域的热点研究方向。本文系统总结近年来在甲酸生物转化途径改造和重构,与之匹配的还原力供给方式以及甲酸自养型菌株构建等方面的最新研究进展,并探讨甲酸生物转化中的主要问题和突破方向。

The vision of attaining a carbon peak and achieving carbon neutrality guides the transition to a low-carbon economic system in China.It is a huge challenge to achieve by 2060,under the premise of continuing the high-speed economic growth,that the quantity of carbon dioxide and other greenhouse gases emitted by diverse activities such as production and living might be offset by the amount of carbon dioxide sequestered by bio-fixation-transformation and other technologies.How to balance“emission”and“absorption and utilization,”as well as carry out effective emission reduction,capture and reuse of carbon dioxide to promote the achievement of carbon peaking and carbon neutrality goals,has emerged as a critical issue and pressing task for scientific study and industrial development.To date,six natural CO2fixation pathways have been identified,although there are problems such as poor carbon efficiency and challenging modification.With the development of electrochemical technology,the chemical conversion of carbon dioxide to formic acid has become increasingly mature in recent years.Biotransformation using formic acid as a substrate has become a popular issue in biological carbon fixation.In this review,we summarize the latest research progress in the transformation and reconstruction of formic acid biotransformation pathway,mainly emphasizing on the reducing power balancing and the construction of formic acid autotrophic strains,and also discuss the existed problems of formic acid biotransformation and its potential breakthroughs.