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Updated: Sep 4, 2025
![Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F55858.jpg&w=3840&q=50)
Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase
Published on: December 4, 2017
Thioester synthesis by a designed nickel enzyme models prebiotic energy conversion
Anastasia C Manesis1, Alina Yerbulekova1, Jason Shearer2
1The Ohio State Biochemistry Program, The Ohio State University, Columbus, OH 43210.
Researchers created an artificial enzyme modeling acetyl-CoA synthase (ACS) to understand carbon-carbon bond formation. This artificial ACS reveals key reaction steps and offers insights for sustainable fuel catalysts.
Area of Science:
- Biochemistry
- Bioorganometallic Chemistry
- Enzyme Catalysis
Background:
- Carbon-carbon bond formation from CO2 is vital for life.
- The carbon monoxide dehydrogenase/acetyl-CoA synthase (CODH/ACS) enzyme facilitates this in the Wood-Ljungdahl pathway.
- Understanding CODH/ACS is crucial for harnessing similar chemistry.
Purpose of the Study:
- To develop an artificial metalloenzyme as a model for ACS.
- To elucidate the mechanism of bioorganometallic carbon-carbon bond formation.
- To investigate the formation and reactivity of nickel-acetyl intermediates.
Main Methods:
- Protein scaffold engineering (azurin).
- Spectroscopic techniques (time-resolved optical, EPR, XAS).
- Quantum chemical calculations.
Main Results:
- Demonstrated Ni(I) intermediacy and ordered substrate binding.
- Characterized nickel-acetyl intermediate structures and electronic properties.
- Showed nickel-acetyl species facilitate acyl transfer to form thioesters.
Conclusions:
- Proposed a mechanism for thioester generation by the ACS model.
- Provided fundamental insights into enzymatic carbon-carbon bond formation.
- Implications for understanding primitive enzyme evolution and developing sustainable catalysts.
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