Chinese Journal of Catalysis ›› 2024, Vol. 60: 294-303.DOI: 10.1016/S1872-2067(23)64643-1

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Light-driven CO2 utilization for chemical production in bacterium biohybrids

Yamei Gana, Tiantian Chaia, Jian Zhanga, Cong Gaoa, Wei Songb, Jing Wub, Liming Liua, Xiulai Chena,*()   

  1. aSchool of Biotechnology and Key Laboratory of Industrial Biotechnology of Ministry of Education, Jiangnan University, Wuxi 214122, Jiangsu, China
    bSchool of Life Sciences and Health Engineering, Jiangnan University, Wuxi 214122, Jiangsu, China
  • Received:2024-01-07 Accepted:2024-02-28 Online:2024-05-18 Published:2024-05-22
  • Contact: E-mail: xlchen@jiangnan.edu.cn (X. Chen).
  • Supported by:
    National Natural Science Foundation of China(22122806);National Natural Science Foundation of China(22038005);Provincial Natural Science Foundation of Jiangsu Province(BK20211529);Provincial Natural Science Foundation of Jiangsu Province(BK20220022);Fundamental Research Funds for the Central Universities(JUSRP622001);Fundamental Research Funds for the Central Universities(JUSRP622011);National First-class Discipline Program of Light Industry Technology and Engineering(QGJC20230101)

Abstract:

Artificial photosynthetic systems provide an alternative approach for the sustainable, efficient, and versatile production of biofuels and biochemicals. However, improving the efficiency of electron transfer between semiconductor materials and microbial cells remains a challenge. In this study, an inorganic-biological photosynthetic biohybrid system (IBPHS) consisting of photocatalytic and biocatalytic modules was developed by integrating cadmium telluride quantum dots (CdTe QDs) with Escherichia coli cells. A photocatalytic module was constructed by biosynthesizing CdTe QDs to capture light and generate electrons. The biocatalytic module was built by converting photo-induced electrons to enhance NADH regeneration; thus, the NADH content in E. coli under blue light increased by 5.1-fold compared to that in darkness. Finally, IBPHS was utilized to drive CO2 reduction pathways for versatile bioproduction such as formate and pyruvate, with CO2 utilization rates up to 51.98 and 21.92 mg/gDCW/h, respectively, exceeding that of cyanobacteria. This study offers a promising platform for the rational design of biohybrids for efficient biomanufacturing processes with high complexity and functionality.

Key words: Artificial photosynthetic system, CO2 utilization, Solar energy conversion, CdTe biosynthesis, NADH regeneration