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1.西湖大学合成生物学与生物智造中心,浙江 杭州 310030
2.西湖大学工学院,浙江 杭州 310030
3.浙江省全省智能低碳生物合成重点实验室,浙江 杭州 310030
4.西湖大学未来产业研究中心,浙江 杭州 310030
5.广东恒碳科技有限公司,广东 广州 510630
Received:27 March 2024,
Revised:2024-06-18,
Published:31 December 2024
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刘建明, 张炽坚, 张冰, 曾安平. 巴氏梭菌作为工业底盘细胞高效生产1,3-丙二醇——从代谢工程和菌种进化到过程工程和产品分离[J]. 合成生物学, 2024, 5(6): 1386-1403
LIU Jianming, ZHANG Chijian, ZHANG Bing, ZENG Anping. Clostridium pasteurianum as an industrial chassis for efficient production of 1,3-propanediol: from metabolic engineering to fermentation and product separation[J]. Synthetic Biology Journal, 2024, 5(6): 1386-1403
刘建明, 张炽坚, 张冰, 曾安平. 巴氏梭菌作为工业底盘细胞高效生产1,3-丙二醇——从代谢工程和菌种进化到过程工程和产品分离[J]. 合成生物学, 2024, 5(6): 1386-1403 DOI: 10.12211/2096-8280.2024-030.
LIU Jianming, ZHANG Chijian, ZHANG Bing, ZENG Anping. Clostridium pasteurianum as an industrial chassis for efficient production of 1,3-propanediol: from metabolic engineering to fermentation and product separation[J]. Synthetic Biology Journal, 2024, 5(6): 1386-1403 DOI: 10.12211/2096-8280.2024-030.
1,3-丙二醇(PDO)是一种重要的化工原料,广泛应用于材料和化妆品等领域。生物制造PDO具有原料可再生性和环境友好性等众多优点和广阔的发展前景。由于巴氏梭菌(
Clostridium pasteurianum
)菌株安全、非致病、代谢甘油速率快、生长快、不依赖昂贵的培养基组分、天然具备高效生产PDO代谢途径等条件,利用和改造巴氏梭菌作为工业底盘生产PDO呈现出得天独厚的优势。本文首先回顾了PDO的生物制造现状和挑战,随后深入探讨了采用巴氏梭菌生产PDO的方法,特别关注于巴氏梭菌的甘油代谢机制、甘油发酵的策略和发酵过程的工艺设计。值得一提的是,本文作者研究团队筛选到的巴氏梭菌突变体和随之开发的鲁棒性发酵工艺在一定程度上突破了传统巴氏梭菌对环境的要求,特别是对铁离子浓度的敏感性;在电辅助甘油发酵过程中,PDO产量达到120.7 g/L,生产强度达到4.8 g/(L·h),收率达到理论值;并进一步阐述了巴氏梭菌基因工程改造方面的天然屏障,围绕着理性基因组改造和定向进化等几个方面进行了详细讨论;由于PDO产品纯度(
>
99.9%)通常有较高要求,因此开发高效的下游处理技术对于实现利用可再生资源发酵生产PDO的工业化应用至关重要,本文在分离工艺方面主要讨论了基于蒸发和蒸馏的PDO纯化技术以及基于萃取的PDO纯化技术。通过对代谢工程、菌种进化、发酵过程优化以及产品分离等多个维度全方位分析,全面地解析了巴氏梭菌生产PDO的特点和优势,以及巴氏梭菌作为新型工业底盘微生物在未来发展过程中值得关注的问题。
1
3-Propanediol (PDO) is an important chemical extensively used in material science and the cosmetics industry. The biomanufacturing of PDO offers numerous advantages
such as the renewability of raw materials and environmental friendliness. Among various microorganisms
Clostridium pasteurianum
emerges as an ideal choice for industrial PDO production due to its safety
non-pathogenic nature
rapid glycerol metabolism
fast growth rate
independence from expensive culture medium components
and its inherent efficient metabolic pathway for PDO production. This review begins by introducing the current state and challenges of PDO biomanufacturing
followed by an in-depth discussion of the methods for producing PDO using
C. pasteurianum
. Special attention is paid to the glycerol metabolism mechanism
strategies for glycerol fermentation
and the design of the fermentation process. Notably
our research group has identified
C. pasteurianum
mutant strains and developed robust processes that have largely addressed the organism’s traditional sensitivities to e
nvironmental conditions
especially regarding iron concentration and impurities of raw glycerol. In an electricity-aided fermentation process
PDO concentration as high as 120.6 g/L was achieved
with a productivity of 4.8 g/(L·h) and a yield reaching the theoretical maximum. We further discuss the natural limitations of genetic engineering in
C. pasteurianum
exploring strategies based on rational genomic modification and directed evolution. Finally
the development of efficient downstream processing technologies is emphasized as crucial for realizing the cost-effective microbial production of PDO from renewable resources
since the industrial application of PDO requires a very high purity (
>
99.9%). The discussion on PDO downstream processing mainly focuses on evaporation
distillation
and extraction-based purification techniques. Through a comprehensive coverage of metabolic engineering
strain evolution
fermentation optimization
and product separation technologies
this review discusses about the characteristics and advantages of PDO production from
C. pasteurianum
highlighting key considerations for advancing this microorganism as a new industrial chassis.
2
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