Chinese Journal of Catalysis ›› 2024, Vol. 60: 294-303.DOI: 10.1016/S1872-2067(23)64643-1
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Yamei Gana, Tiantian Chaia, Jian Zhanga, Cong Gaoa, Wei Songb, Jing Wub, Liming Liua, Xiulai Chena,*()
Received:
2024-01-07
Accepted:
2024-02-28
Online:
2024-05-18
Published:
2024-05-22
Contact:
E-mail: Supported by:
Yamei Gan, Tiantian Chai, Jian Zhang, Cong Gao, Wei Song, Jing Wu, Liming Liu, Xiulai Chen. Light-driven CO2 utilization for chemical production in bacterium biohybrids[J]. Chinese Journal of Catalysis, 2024, 60: 294-303.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(23)64643-1
Fig. 1. Designing inorganic-biological photosynthetic biohybrid system (IBPHS) for CO2 utilization. IBPHS consisted of the photocatalytic and biocatalytic modules. The photocatalytic module was constructed by biosynthesizing CdTe QDs to capture light and then generate electrons. The biocatalytic module was built by converting photo-induced electrons to enhance NADH regeneration. IBPHS was utilized to drive CO2 reduction pathways for versatile bioproduction such as formate and pyruvate. VB: valence band; CB: conduction band; e?: electron; CO2: carbon dioxide; HWLS: half-Wood-Ljungdahl-formolase.
Fig. 2. Constructing inorganic-biological photosynthetic biohybrid system (IBPHS). (a) ICP-MS showing the absorption of Cd2+ ions. (b?d) CLSM image showing the biosynthesis of CdTe nanoparticles in E. coli JZ. (e) Cross-section TEM image showing the localization of CdTe nanoparticles in E. coli cells. The black dots represent CdTe nanoparticles. HAADF-STEM images (f?i) and EDS mapping (j) of CdTe nanoparticles. (k) XPS analysis of CdTe nanoparticles. (l) HETEM image and lattice fringes of CdTe nanoparticles.
Fig. 3. Evaluating inorganic-biological photosynthetic biohybrid system (IBPHS). (a) UV-vis diffuse reflectance spectra of E. coli strains. (b) Bandgap width of CdTe QDs. (c) Transient photocurrent of IBPHS. (d) Electrochemical impedance spectroscopy of IBPHS. (e,f) Intracellular NADH contents of IBPHS. (g,h) Evaluation of the regenerated NADH for bioproduction in vivo and in vitro, respectively.
Fig. 4. Converting CO2 to formate by the inorganic-biological photosynthetic biohybrid system (IBPHS). (a) Photocatalytic reduction of CO2 for formate production in vitro. (b) Photocatalytic reduction of CO2 for formate production in vivo. (c) Optimizing FDH expression by coupling the ribosome-binding site with plasmids. (d) Formate production by optimizing FDH expression.
Fig. 5. Converting CO2 to pyruvate by the inorganic-biological photosynthetic biohybrid system (IBPHS). (a) Photocatalytic reduction of CO2 for pyruvate production in vivo. (b) Engineered E. coli strains for pyruvate production. (c) Pyruvate production with E. coli FH under light and dark conditions. (d) CO2-fixing rate of E. coli FH under light and dark conditions. pyk: pyruvate kinase; Fhs: formyl-tetrahydrofolate cyclohydrolase; FchA: methylene-THF dehydrogenase; FolD: methylene-THF reductase; FLS: formolase; DHAK: dihydroxyacetone kinase.
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