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Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules
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How Geometric Constraints Control the Hydride Position and Activity in [NiFe]-Hydrogenases and Their Biomimetic
Shuqiang Niu1, Michael B Hall1
1Department of Chemistry, Texas A&M University, College Station, Texas 77843-3257, United States.
Inorganic Chemistry
|May 9, 2025
Summary
Researchers studied the Ni-R active site in [NiFe]-hydrogenase to understand hydride positioning and activity in hydrogen-evolving catalysts. They designed new biomimetic complexes with improved potential for H2 formation.
Area of Science:
- Bioinorganic chemistry
- Catalysis
- Computational chemistry
Background:
- The Ni-R active site in [NiFe]-hydrogenase has a Ni-displaced hydride.
- Synthetic Ni-R models show Fe-displaced hydrides and low H2 evolution turnover frequencies.
Purpose of the Study:
- Investigate factors governing hydride position and activity in Ni-R and biomimetic complexes.
- Develop efficient hydrogen-evolving catalysts.
Main Methods:
- Coupled cluster with singles and doubles (CCSD) theory
- Density functional theory (DFT)
- Natural bond orbital (NBO) analysis
- Quantum theory of atoms in molecules (QTAIM) analysis
Main Results:
- The Ni site prefers a square-planar [S2NiSH] configuration.
- Hydride positioning depends on [Ni-H-Fe] bonding strength, modulated by geometric torsion.
- Designed virtual complexes (4-10) with enhanced hydride nucleophilicity and H2 formation potential.
Conclusions:
- Geometric and electronic factors significantly influence hydride activity in hydrogenase models.
- Insights inform the design of more effective biomimetic hydrogenase catalysts.
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