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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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Designed High-Redox Potential Laccases Exhibit High Functional Diversity.

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Researchers engineered high-redox potential laccases (HRPLs) for improved function. This stabilize-and-diversify strategy enhances enzyme expression, activity, and substrate range for lignin degradation applications.

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Area of Science:

  • Biotechnology and Enzyme Engineering
  • Industrial Microbiology
  • Biocatalysis

Background:

  • White-rot fungi produce high-redox potential laccases (HRPLs) and peroxidases crucial for lignin breakdown.
  • Laccases are valuable industrial enzymes due to their broad substrate specificity and eco-friendly nature.
  • Challenges in expressing functional recombinant HRPLs necessitate advanced protein engineering approaches.

Purpose of the Study:

  • To develop a rational, stabilize-and-diversify strategy for engineering challenging HRPLs.
  • To improve the functional expression, activity, and substrate diversity of previously unexpressed HRPLs.
  • To create a foundation for a yeast-secreted enzyme consortium for efficient lignin degradation.

Main Methods:

  • Applied the PROSS stability-design algorithm for initial functional expression of HRPLs in yeast.
  • Utilized the stabilized enzymes as templates for FuncLib active-site design to enhance performance.
  • Introduced subtle mutations (3-4) altering substrate-oxidation site polarity, solvation, and sterics.

Main Results:

  • Achieved functional expression of two previously intractable HRPLs using the PROSS algorithm.
  • Developed four FuncLib-designed HRPL variants and their PROSS progenitor with diverse reactivity profiles.
  • Observed orders-of-magnitude changes in reactivity against high-redox potential substrates, including lignin monomers.

Conclusions:

  • The stabilize-and-diversify strategy successfully yielded stable, versatile HRPLs with enhanced lignin-related substrate activity.
  • This approach overcomes expression challenges and expands the utility of recalcitrant enzymes.
  • The engineered HRPLs represent a significant advancement toward developing effective lignin-degrading biocatalytic systems.