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Dehydrogenase versus oxidase function: the interplay between substrate binding and flavin microenvironment.

Teresa Benedetta Guerriere1, Alessandro Vancheri2, Ilaria Ricotti2

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ACS Catalysis
|January 9, 2025
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Summary
This summary is machine-generated.

Researchers explored how flavoenzymes control oxygen reactivity, finding that small changes in the flavin-binding site drastically alter enzyme function. This impacts enzyme design and understanding of lignin degradation.

Keywords:
enzyme evolutionflavinmicrobial metabolismoxidationoxidative metabolismoxygen biochemistry

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Area of Science:

  • Biochemistry
  • Enzyme kinetics
  • Protein engineering

Background:

  • Redox enzymes utilize cofactors to modulate reactivity with oxygen.
  • Controlling oxygen reactivity via the protein environment is crucial for mechanistic enzymology and enzyme design.
  • Flavoenzymes involved in lignin degradation offer a model system to study oxygen reactivity control.

Purpose of the Study:

  • To investigate how the protein environment of flavoenzymes influences their oxygen reactivity.
  • To understand the mechanisms by which flavoenzymes switch between oxidase and dehydrogenase functions.
  • To provide insights for the rational design of enzymes with tailored functionalities.

Main Methods:

  • Phylogenetic analysis to identify conserved amino acid motifs in flavin-binding sites.
  • Enzyme kinetics and mutagenesis studies to probe the role of specific residues.
  • Structural and computational methods to examine the flavin environment and oxygen diffusion pathways.

Main Results:

  • Conserved amino acid motifs were identified in the flavin-binding sites of lignin-degrading flavoenzymes.
  • Subtle, localized changes in the flavin environment significantly impact oxygen reactivity.
  • The creation or blockade of oxygen diffusion pathways and substrate binding influence enzyme function.
  • Site-specific amino acid replacements can switch flavoenzymes between oxidase and dehydrogenase activities.

Conclusions:

  • The protein microenvironment finely tunes flavoenzyme oxygen reactivity and function.
  • Enzyme structure-function relationships are explained by localized changes affecting oxygen access.
  • Findings offer a basis for engineering flavoenzymes with desired catalytic properties for applications in lignin degradation and beyond.