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Updated: Jan 20, 2026
09:58
Light-driven Enzymatic Decarboxylation
Published on: May 22, 2016
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Coupling efficiency in light-driven hybrid P450BM3 and CYP119 enzymes.
Mallory Kato1, Marya Melkie1, Jeffrey Li1
1San José State University, Department of Chemistry, One Washington Square, San José, CA, 95192-0101, USA.
Archives of Biochemistry and Biophysics
|August 20, 2019
Summary
This study enhances photocatalytic activity in hybrid P450 enzymes using a light-driven approach with the Sulfolobus acidocaldarius CYP119 enzyme. A novel dual role for diethyldithiocarbamate as an electron donor and efficiency probe was discovered.
Area of Science:
- Biochemistry
- Photocatalysis
- Enzyme Engineering
Background:
- Cytochrome P450 enzymes are crucial for various biological oxidations.
- Developing artificial systems to mimic and enhance P450 activity is an active research area.
- Hybrid enzymes combining photosensitizers with P450s offer a light-driven catalytic approach.
Purpose of the Study:
- To extend the light-driven hybrid P450 enzyme approach to the archaeal Sulfolobus acidocaldarius CYP119.
- To investigate the photocatalytic activity and mechanism of this novel hybrid enzyme system.
- To explore the role of the sacrificial electron donor in the photocatalytic reaction.
Main Methods:
- Covalent attachment of a Ru(II)-diimine photosensitizer to the CYP119 enzyme.
- Photocatalytic hydroxylation of 11-nitrophenoxyundecanoic acid.
- Kinetic analysis to determine catalytic efficiency (kcat).
- Investigation of diethyldithiocarbamate's role as an electron donor and quencher.
Main Results:
- Achieved high photocatalytic activity for CYP119 hydroxylation, exceeding that with natural redox partners.
- Demonstrated that diethyldithiocarbamate acts as both an electron donor and an excited state quencher.
- Identified diethyldithiocarbamate's utility as a probe for coupling efficiency in light-driven hybrid enzymes.
Conclusions:
- The light-driven hybrid enzyme approach is effective for enhancing the activity of archaeal CYP119.
- Diethyldithiocarbamate plays a critical dual role, facilitating electron transfer and enabling efficiency assessment.
- This work advances the development of artificial metalloenzymes for sustainable chemical synthesis.
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