衣康酸
原材料
代谢工程
自养
生物反应器
异源的
生化工程
毕赤酵母
商品化学品
生物过程
制浆造纸工业
发酵
化学
生物技术
生物化学
生物
有机化学
细菌
基因
古生物学
催化作用
遗传学
聚合物
工程类
重组DNA
共聚物
作者
Michael Baumschabl,Özge Ata,Bernd M Mitic,Lisa Lutz,Thomas Gassler,Christina Troyer,Stephan Hann,Diethard Mattanovich
标识
DOI:10.1073/pnas.2211827119
摘要
The increase of CO 2 emissions due to human activity is one of the preeminent reasons for the present climate crisis. In addition, considering the increasing demand for renewable resources, the upcycling of CO 2 as a feedstock gains an extensive importance to establish CO 2 -neutral or CO 2 -negative industrial processes independent of agricultural resources. Here we assess whether synthetic autotrophic Komagataella phaffii ( Pichia pastoris ) can be used as a platform for value-added chemicals using CO 2 as a feedstock by integrating the heterologous genes for lactic and itaconic acid synthesis. 13 C labeling experiments proved that the resulting strains are able to produce organic acids via the assimilation of CO 2 as a sole carbon source. Further engineering attempts to prevent the lactic acid consumption increased the titers to 600 mg L −1 , while balancing the expression of key genes and modifying screening conditions led to 2 g L −1 itaconic acid. Bioreactor cultivations suggest that a fine-tuning on CO 2 uptake and oxygen demand of the cells is essential to reach a higher productivity. We believe that through further metabolic and process engineering, the resulting engineered strain can become a promising host for the production of value-added bulk chemicals by microbial assimilation of CO 2 , to support sustainability of industrial bioprocesses.
科研通智能强力驱动
Strongly Powered by AbleSci AI