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Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation
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Light-Activated Artificial CO2-Reductase: Structure and Activity.

Raphaël J Labidi1, Bruno Faivre1, Philippe Carpentier2,3

  • 1Laboratoire de Chimie des Processus Biologiques, UMR 8229, Collège de France, CNRS, Sorbonne Université, 11, Place Marcellin-Berthelot, Paris 75005, France.

Journal of the American Chemical Society
|October 1, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel artificial enzyme for efficient carbon dioxide (CO2) photoreduction to carbon monoxide (CO). This noble metal-free system achieved record-breaking performance, offering insights into CO2 conversion mechanisms.

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Area of Science:

  • Biocatalysis and artificial enzymes
  • Photochemistry and renewable energy
  • Carbon capture and utilization

Background:

  • Artificial enzymes offer promising avenues for catalyzing CO2 reduction.
  • Developing efficient and selective catalysts for CO2 conversion remains a critical challenge.

Purpose of the Study:

  • To create and characterize a novel artificial enzyme for light-driven CO2 reduction.
  • To achieve high activity and selectivity in CO2 to CO conversion using a noble metal-free photosystem.

Main Methods:

  • Combination of heme oxygenase with cobalt-protoporphyrin IX to form an artificial enzyme.
  • Utilized a copper-based photosensitizer for noble metal-free operation.
  • Employed photophysical studies and high-resolution crystallography to investigate the reaction mechanism and active site.

Main Results:

  • Achieved a high turnover frequency of ~616 h-1 and a turnover number of ~589 after 3 hours.
  • Obtained a CO vs H2 selectivity of 72%, setting a new record for artificial CO2 reductases.
  • Identified reaction intermediates and elucidated mechanistic insights through detailed photophysical studies.

Conclusions:

  • The structurally characterized artificial enzyme demonstrates excellent activity and selectivity for CO2 photoreduction.
  • The noble metal-free system represents a significant advancement in artificial photosynthesis for CO2 utilization.
  • Site-directed mutagenesis based on structural data can further optimize artificial enzyme performance.