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Related Experiment Videos

Dynamics involved in catalysis by single-component and two-component flavin-dependent aromatic hydroxylases.

David P Ballou1, Barrie Entsch, Lindsay J Cole

  • 1Department of Biological Chemistry, University of Michigan, Ann Arbor, MI 48109-0606, USA. dballou@umich.edu

Biochemical and Biophysical Research Communications
|October 21, 2005
PubMed
Summary

Flavin-dependent monooxygenases use complex catalytic cycles involving protein dynamics. These enzymes, crucial for drug detoxification and biosynthesis, employ single-component or two-component systems to activate oxygen for substrate hydroxylation.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • Flavoprotein monooxygenases are essential enzymes catalyzing diverse biological processes, including drug metabolism and biosynthesis.
  • These enzymes utilize nicotinamide adenine dinucleotide (phosphate) [NAD(P)H] and molecular oxygen (O2) as co-substrates.
  • The core reaction involves the reduction of a flavin cofactor, followed by its reaction with O2 to form a C4a-(hydro)peroxyflavin intermediate, the active oxygenating species.

Purpose of the Study:

  • To elucidate the catalytic strategies employed by flavoprotein monooxygenases.
  • To understand the role of protein dynamics in facilitating complex enzymatic reactions.
  • To differentiate between single-component and two-component enzyme systems.

Main Methods:

Related Experiment Videos

  • The study focuses on the enzyme para-hydroxybenzoate hydroxylase as a model for single-component monooxygenases.
  • Analysis of enzyme conformations (open, closed, out) and their roles in substrate binding, oxygen activation, and cofactor reduction.
  • Examination of the mechanisms in two-component systems involving reductase and oxygenase components for flavin transfer and stabilization.

    • Main Results:

    • Single-component enzymes like para-hydroxybenzoate hydroxylase exhibit significant protein and flavin dynamics, transitioning between conformations to regulate substrate access and protect reactive intermediates.
    • The 'closed' conformation shields the C4a-(hydro)peroxyflavin intermediate from solvent, while the 'out' conformation facilitates hydride transfer from NAD(P)H.
    • Two-component systems require efficient inter-component flavin transfer and stabilization of the C4a-peroxyflavin intermediate to prevent premature flavin oxidation and ensure substrate hydroxylation.

    Conclusions:

    • Flavoprotein monooxygenases utilize sophisticated protein dynamics to manage the intricate requirements of their catalytic cycles.
    • Both single-component and two-component strategies have evolved to optimize oxygen activation and substrate hydroxylation.
    • Understanding these dynamic mechanisms is crucial for enzyme engineering and applications in various biotechnological fields.