9F5U image
Entry Detail
PDB ID:
9F5U
Keywords:
Title:
Crystal structure of Heme-Oxygenase from Corynebacterium diphtheriae complexed with Cobalt-porphyrine (HumO-Co(III))
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2024-04-30
Release Date:
2024-10-16
Method Details:
Experimental Method:
Resolution:
1.15 Å
R-Value Free:
0.17
R-Value Work:
0.14
R-Value Observed:
0.14
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:heme oxygenase (biliverdin-producing)
Chain IDs:A
Chain Length:215
Number of Molecules:1
Biological Source:Corynebacterium diphtheriae
Primary Citation

Abstact

Light-dependent reduction of carbon dioxide (CO2) into value-added products can be catalyzed by a variety of molecular complexes. Here we report a rare example of a structurally characterized artificial enzyme, resulting from the combination of a heme binding protein, heme oxygenase, with cobalt-protoporphyrin IX, with good activity for the photoreduction of CO2 to carbon monoxide (CO). Using a copper-based photosensitizer, thus making the photosystem free of noble metals, a large turnover frequency value of ∼616 h-1, a turnover value of ∼589, after 3 h reaction, and a CO vs H2 selectivity of 72% were obtained, establishing a record among previously reported artificial CO2 reductases. Thorough photophysical studies allowed tracking of reaction intermediates and provided insights into the reaction mechanism. Thanks to a high-resolution crystal structure of the artificial enzyme, both in the absence and in the presence of the protein-bound CO2 substrate, a rational site-directed mutagenesis approach was used to study the effect of some modifications of the active site on the activity.

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