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Boosting artificial nicotinamide cofactor systems.

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Researchers developed inexpensive synthetic nicotinamide cofactors to replace costly NAD(P)/H. This improved a glucose dehydrogenase system 160-fold, enabling efficient sugar oxidation and artificial cofactor regeneration for industrial use.

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Area of Science:

  • Biochemistry
  • Enzyme Engineering
  • Synthetic Biology

Background:

  • Nicotinamide adenine dinucleotide (NAD(P)/H) cofactors are essential in biological redox reactions but are prohibitively expensive for industrial applications.
  • Developing cost-effective biomimetic alternatives for NAD(P)/H is crucial for advancing biocatalysis and sustainable chemical synthesis.
  • Thermostable enzymes offer advantages in industrial processes due to their stability at high temperatures.

Purpose of the Study:

  • To investigate the effect of specific mutations on the activity and stability of a thermostable glucose dehydrogenase (GDH) from *Saccharolobus solfataricus* (*Ss*GDH).
  • To evaluate the performance of *Ss*GDH with a novel set of synthetic nicotinamide cofactor biomimetics.
  • To demonstrate efficient cofactor regeneration and sugar oxidation using the engineered enzyme and synthetic cofactors for potential industrial applications.

Main Methods:

  • Site-directed mutagenesis was employed to introduce specific amino acid changes in *Ss*GDH.
  • A novel series of synthetic nicotinamide cofactor biomimetics were synthesized and characterized.
  • Enzyme kinetics, sugar oxidation assays, and cofactor regeneration studies were performed under various conditions.

Main Results:

  • Mutational studies identified key residues influencing *Ss*GDH activity and stability with synthetic cofactors.
  • The engineered *Ss*GDH system demonstrated successful oxidation of a diverse range of sugars.
  • The optimized system achieved a 160-fold improvement in performance compared to the native enzyme using the standard biomimetic BNA+.

Conclusions:

  • The development of inexpensive synthetic nicotinamide cofactors and enzyme engineering strategies significantly enhances GDH performance.
  • This work presents a highly efficient artificial cofactor regeneration system for sugar oxidation.
  • The findings support the potential for competitive industrial utilization of artificial cofactor regeneration systems in biocatalysis.