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Engineering artificial photosynthesis based on rhodopsin for CO₂ fixation

Biology

Engineering artificial photosynthesis based on rhodopsin for CO₂ fixation

W. Tu, J. Xu, et al.

This groundbreaking research by Weiming Tu, Jiabao Xu, Ian P. Thompson, and Wei E. Huang introduces an innovative artificial photosynthesis system that harnesses rhodopsin's proton-pumping capabilities and integrates microbial carbon fixation to significantly enhance CO₂ conversion efficiency.

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Playback language: English
Abstract
This research constructs an artificial photosynthesis system combining rhodopsin's proton-pumping with extracellular electron uptake to drive photoelectrosynthetic CO₂ fixation by *Ralstonia eutropha*. *R. eutropha* is engineered to express an electron transfer pathway from *Shewanella oneidensis* and *Gloeobacter rhodopsin* (GR). GR and the MtrCAB complex from *S. oneidensis* integrate electrons and proton motive force into *R. eutropha*'s electron transport chain (ETC). The system splits water to supply electrons, with GR powering ATP synthesis and reversing the ETC to regenerate NADH/NADPH for biomass synthesis from CO₂. Overexpression of carbonic anhydrase enhances CO₂ fixation. This system advances efficient photosynthesis and redefines microbial rhodopsins' ecological role.
Publisher
Nature Communications
Published On
Dec 04, 2023
Authors
Weiming Tu, Jiabao Xu, Ian P. Thompson, Wei E. Huang
Tags
artificial photosynthesis
rhodopsin
CO₂ fixation
Ralstonia eutropha
electron transport chain
sustainable energy
microbial ecology

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