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Updated: Dec 8, 2025
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Simultaneous Measurement of Superoxide/Hydrogen Peroxide and NADH Production by Flavin-containing Mitochondrial Dehydrogenases
Published on: February 24, 2018
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Krypton-derivatization highlights O2-channeling in a four-electron reducing oxidase
Sylvain Engilberge1, Tristan Wagner2, Philippe Carpentier3
1Paul Scherrer Institut, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland.
Chemical Communications (Cambridge, England)
|September 17, 2020
Summary
F420H2-oxidase (FprA) uses reduced F420 to convert oxygen to water. A hydrophobic channel and gating loop likely prevent reactive oxygen species by blocking solvent access during catalysis.
Area of Science:
- Biochemistry
- Enzymology
- Molecular Biology
Background:
- F420H2-oxidase (FprA) is a crucial enzyme in microbial metabolism.
- Understanding its catalytic mechanism is key to comprehending oxygen reduction pathways.
Purpose of the Study:
- To elucidate the structural and dynamic features of FprA that enable efficient oxygen reduction.
- To investigate the role of specific structural elements in preventing reactive oxygen species (ROS) formation.
Main Methods:
- Kr-derivatization to probe the enzyme's internal hydrophobic channel.
- Analysis of protein dynamics, including the movement of a gating loop.
Main Results:
- Identification of a hydrophobic O2-channel within FprA.
- Observation of concerted movement in a gating loop during catalysis.
- Evidence suggesting these features prevent solvent interaction with catalytic intermediates.
Conclusions:
- The hydrophobic O2-channel and gating loop are critical for FprA's function.
- These structural adaptations effectively prevent ROS formation, ensuring safe oxygen metabolism.
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