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A protein-based laboratory system reported in 2018 used light to drive the conversion of carbon dioxide (CO₂) into carbon monoxide (CO). That is carbon conversion, not proof of permanent carbon storage or large-scale carbon removal. The work combined a light-absorbing dye, a protein scaffold and an attached nickel catalyst to imitate selected steps of photosynthesis.
How does the engineered protein system work?
Chemistry World’s 2018 report describes work led by Jiangyun Wang’s team. The researchers modified a natural fluorescent protein to bring light capture and CO₂-reduction chemistry together in a compact construct:
- Capture light: A benzophenone–alanine dye was added to the protein. It absorbs light and, when illuminated, takes electrons from NADH, forming a highly reducing excited state.
- Attach a catalyst: A cysteine mutation enabled a nickel–terpyridine catalyst to bind to the protein.
- Reduce CO₂: The excited dye supplies reducing power to the attached catalyst, which drives the conversion of CO₂ to CO.
The protein provides a scaffold for arranging the artificial molecular components; it is not, by itself, a complete photosynthetic organism. The account describes a research demonstration, not an industrial process.
What does “capture carbon” mean in this case?
The reported product is carbon monoxide. The system therefore converts CO₂ into another carbon-containing molecule; the report does not establish that the carbon is permanently stored or removed from the atmosphere. Nor does it show the full natural-photosynthesis outcome of fixing carbon into sugars or biomass.
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Calling this “capture” can blur an important distinction: converting a molecule is not the same as keeping its carbon out of the atmosphere over the long term. The available account does not demonstrate deployment, net carbon removal or a lifecycle climate benefit.
What the 2018 report does—and does not—establish
Chemistry World’s 2018 report is secondary coverage of the team’s work. The original primary paper is not identified in the indexed report, and no performance statistic for this exact construct is given there. In particular, the report does not establish a yield, turnover, efficiency, operating lifetime or scale that would support comparison with industrial processes.
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Those omissions limit what can be concluded: the described design shows a way to couple light-driven electron transfer with a CO₂-reduction catalyst in a protein scaffold, but it is not evidence of a commercially available technology or a climate solution ready for deployment.
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“Artificial photosynthesis” covers systems with different architectures and goals. The later examples below are not replications of the protein–dye–catalyst construct; they illustrate why the light-harvesting mechanism, electron source, product and level of demonstrated function all matter.
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| Approach | Architecture and electron or energy input | Reported function | What the cited work establishes |
|---|---|---|---|
| Wang team, reported in Chemistry World (2018) | Protein scaffold with benzophenone–alanine dye and attached nickel–terpyridine catalyst; NADH supplies electrons to the illuminated dye. | CO₂ reduction to CO. | Secondary report of a laboratory research system. The report gives no performance statistic for the exact construct. |
| De novo photochemical reaction center, Ennist et al. (2022) | Designed protein framework with multiple cofactors. | Charge-separated states lasting more than 100 milliseconds. | The study reports long-lived charge separation; its authors identify engineering a catalytic site as a next challenge. Charge separation alone is not proof of a completed carbon-conversion process. |
| Rhodopsin-based system, Tu et al. (2023) | Engineered Ralstonia eutropha H16 cells combine rhodopsin-driven proton motive force with extracellular electron transfer. | Carbon-dioxide fixation in a cell-based photoelectrosynthetic route. | A distinct engineered-cell approach, not the isolated protein construct described in the 2018 report. |
| Microfluidic chloroplast mimic (2020) | Microfluidic droplets containing photosynthetic membranes and a synthetic carbon-fixation pathway. | Light-driven synthetic CO₂ fixation. | A compartment-based design, distinct from both the protein construct and the engineered-cell approach. |
The approaches cannot be ranked quantitatively from these reports: the available evidence does not provide a common set of comparable performance measurements. A meaningful comparison would need to account for architecture, where electrons come from and how they flow, the chemical product, catalytic turnover and stability, and demonstrated scale or lifecycle performance.
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