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Related Experiment Videos

Substrate radical intermediates in soluble methane monooxygenase.

Aimin Liu1, Yi Jin, Jingyan Zhang

  • 1Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA.

Biochemical and Biophysical Research Communications
|September 17, 2005
PubMed
Summary

Electron paramagnetic resonance (EPR) spin-trapping experiments using methane monooxygenase (MMO) revealed no substrate radicals with DMPO or POBN traps. However, nitrosobenzene (NOB) acted as both substrate and trap, indicating a stepwise MMO mechanism.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Spectroscopy

Background:

  • Soluble methane monooxygenase (MMO) is a crucial enzyme in methane metabolism.
  • Understanding MMO's catalytic mechanism, particularly the potential formation of radical intermediates, is vital.

Purpose of the Study:

  • To investigate the formation of substrate radical intermediates during methane monooxygenase (MMO) catalysis using EPR spin-trapping.
  • To elucidate the role of different spin-traps and their interactions with MMO components.

Main Methods:

  • Electron paramagnetic resonance (EPR) spin-trapping experiments.
  • Utilized three-component soluble MMO with spin-traps: 5,5-dimethyl-1-pyrroline N-oxide (DMPO), alpha-4-pyridyl-1-oxide N-tert-butylnitrone (POBN), and nitrosobenzene (NOB).
  • Investigated NADH-coupled oxidations of various substrates and interactions with MMO reductase component.

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Main Results:

  • DMPO and POBN did not detect substrate radicals during NADH-coupled MMO oxidations, contrary to previous reports.
  • Radicals were detected with DMPO and POBN when only the MMO reductase component and NADH were present.
  • Nitrosobenzene (NOB) strongly inhibited MMO activity and, when used as a spin-trap, yielded EPR signals of an NOB radical.
  • NOB detected radicals in the complete MMO system, irrespective of substrate presence.

Conclusions:

  • Nitrosobenzene (NOB) functions as both a substrate and a spin-trap for methane monooxygenase (MMO).
  • The detection of a long-lived NOB radical supports a stepwise catalytic mechanism for MMO.
  • DMPO and POBN are weak inhibitors and less effective for detecting substrate radicals in this system.