Search

Your search keyword '"carbon monoxyde, carbon dioxide, dehydrogenase"' showing total 2 results
Start Over Descriptor "carbon monoxyde, carbon dioxide, dehydrogenase"
2 results on '"carbon monoxyde, carbon dioxide, dehydrogenase"'

1. First-Principles Calculations on Ni,Fe-Containing Carbon Monoxide Dehydrogenases Reveal Key Stereoelectronic Features for Binding and Release of CO2 to/from the C-Cluster

Author

Breglia, R, Arrigoni, F, Sensi, M, Greco, C, Fantucci, P, De Gioia, L, Bruschi, M, Breglia, Raffaella, Arrigoni, Federica, Sensi, Matteo, Greco, Claudio, Fantucci, Piercarlo, De Gioia, Luca, Bruschi, Maurizio, Breglia, R, Arrigoni, F, Sensi, M, Greco, C, Fantucci, P, De Gioia, L, Bruschi, M, Breglia, Raffaella, Arrigoni, Federica, Sensi, Matteo, Greco, Claudio, Fantucci, Piercarlo, De Gioia, Luca, and Bruschi, Maurizio

Abstract

In view of the depletion of fossil fuel reserves and climatic effects of greenhouse gas emissions, Ni,Fe-containing carbon monoxide dehydrogenase (Ni-CODH) enzymes have attracted increasing interest in recent years for their capability to selectively catalyze the reversible reduction of CO2 to CO (CO2 + 2H+ + 2e-⇌ CO + H2O). The possibility of converting the greenhouse gas CO2 into useful materials that can be used as synthetic building blocks or, remarkably, as carbon fuels makes Ni-CODH a very promising target for reverse-engineering studies. In this context, in order to provide insights into the chemical principles underlying the biological catalysis of CO2 activation and reduction, quantum mechanics calculations have been carried out in the framework of density functional theory (DFT) on different-sized models of the Ni-CODH active site. With the aim of uncovering which stereoelectronic properties of the active site (known as the C-cluster) are crucial for the efficient binding and release of CO2, different coordination modes of CO2 to different forms and redox states of the C-cluster have been investigated. The results obtained from this study highlight the key role of the protein environment in tuning the reactivity and the geometry of the C-cluster. In particular, the protonation state of His93 is found to be crucial for promoting the binding or the dissociation of CO2. The oxidation state of the C-cluster is also shown to be critical. CO2 binds to Cred2 according to a dissociative mechanism (i.e., CO2 binds to the C-cluster after the release of possible ligands from Feu) when His93 is doubly protonated. CO2 can also bind noncatalytically to Cred1 according to an associative mechanism (i.e., CO2 binding is preceded by the binding of H2O to Feu). Conversely, CO2 dissociates when His93 is singly protonated and the C-cluster is oxidized at least to the Cint redox state.

Published
2021

2. First-Principles Calculations on Ni,Fe-Containing Carbon Monoxide Dehydrogenases Reveal Key Stereoelectronic Features for Binding and Release of CO2 to/from the C-Cluster

Author

Federica Arrigoni, Maurizio Bruschi, Luca De Gioia, Matteo Sensi, Raffaella Breglia, Piercarlo Fantucci, C Greco, Breglia, R, Arrigoni, F, Sensi, M, Greco, C, Fantucci, P, De Gioia, L, and Bruschi, M

Subjects
Iron, Protonation, Aldehyde Oxidoreductases, Binding Sites, Carbon Dioxide, Carbon Monoxide, Crystallography, X-Ray, Models, Molecular, Molecular Structure, Multienzyme Complexes, Nickel, Density Functional Theory, 010402 general chemistry, 01 natural sciences, Redox, Catalysis, Inorganic Chemistry, chemistry.chemical_compound, Oxidation state, Computational chemistry, Models, carbon monoxyde, carbon dioxide, dehydrogenase, Physical and Theoretical Chemistry, Crystallography, biology, 010405 organic chemistry, Active site, Molecular, Associative substitution, 0104 chemical sciences, chemistry, biology.protein, X-Ray, Carbon monoxide, Carbon monoxide dehydrogenase
Abstract

In view of the depletion of fossil fuel reserves and climatic effects of greenhouse gas emissions, Ni,Fe-containing carbon monoxide dehydrogenase (Ni-CODH) enzymes have attracted increasing interest in recent years for their capability to selectively catalyze the reversible reduction of CO2 to CO (CO2 + 2H+ + 2e- ⇌ CO + H2O). The possibility of converting the greenhouse gas CO2 into useful materials that can be used as synthetic building blocks or, remarkably, as carbon fuels makes Ni-CODH a very promising target for reverse-engineering studies. In this context, in order to provide insights into the chemical principles underlying the biological catalysis of CO2 activation and reduction, quantum mechanics calculations have been carried out in the framework of density functional theory (DFT) on different-sized models of the Ni-CODH active site. With the aim of uncovering which stereoelectronic properties of the active site (known as the C-cluster) are crucial for the efficient binding and release of CO2, different coordination modes of CO2 to different forms and redox states of the C-cluster have been investigated. The results obtained from this study highlight the key role of the protein environment in tuning the reactivity and the geometry of the C-cluster. In particular, the protonation state of His93 is found to be crucial for promoting the binding or the dissociation of CO2. The oxidation state of the C-cluster is also shown to be critical. CO2 binds to Cred2 according to a dissociative mechanism (i.e., CO2 binds to the C-cluster after the release of possible ligands from Feu) when His93 is doubly protonated. CO2 can also bind noncatalytically to Cred1 according to an associative mechanism (i.e., CO2 binding is preceded by the binding of H2O to Feu). Conversely, CO2 dissociates when His93 is singly protonated and the C-cluster is oxidized at least to the Cint redox state.

Published
2021

Catalog

Books, media, physical & digital resources
See catalog results