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Bienzymatic Sequential Reaction on Microgel Particles and Their Cofactor Dependent Applications.

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Enzyme immobilization on microgels enhances sequential reactions. Simultaneous enzyme binding (PL) improved catalytic efficiency and cofactor-dependent applications compared to sequential binding (PiLi), highlighting the importance of enzyme spacing.

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Area of Science:

  • Bioconjugation Chemistry
  • Enzyme Immobilization
  • Biomaterials Science

Background:

  • Enzyme immobilization on supports is crucial for biocatalysis and enzyme-based applications.
  • Poly(N-isopropylacrylamide)-poly(ethylenimine) (PNIPAm-PEI) microgels offer a versatile platform for enzyme conjugation.
  • Optimizing the spatial arrangement of multiple enzymes on a support is key to enhancing sequential reaction efficiency.

Purpose of the Study:

  • To prepare and characterize dual enzyme bioconjugates using pyruvate kinase (Pk) and l-lactic dehydrogenase (Ldh) immobilized on PNIPAm-PEI microgels.
  • To investigate the impact of enzyme arrangement (simultaneous vs. sequential immobilization) on enzymatic activity and performance.
  • To evaluate the kinetic parameters, stability, and cofactor-dependent applications of the dual enzyme bioconjugates.

Main Methods:

  • Covalent immobilization of Pk and Ldh onto PNIPAm-PEI microgels using glutaraldehyde (GA) cross-linker.
  • Preparation of two types of bioconjugates: simultaneous enzyme addition (PL) and sequential combination of single-enzyme conjugates (PiLi).
  • Characterization of kinetic parameters (Km, kcat), reaction optima (temperature, pH), stability, and cofactor-dependent applications (ADP monitoring, ATP synthesis).

Main Results:

  • The PL bioconjugate exhibited an improved turnover number (kcat) compared to PiLi.
  • The PiLi conjugate showed decreased kcat and catalytic efficiency.
  • The PL conjugate demonstrated nearly twofold higher activity in cofactor-dependent applications (ADP monitoring and ATP synthesis) than PiLi.

Conclusions:

  • Simultaneous immobilization of enzymes (PL) on microgels is superior to sequential immobilization (PiLi) for optimizing Pk-Ldh sequential reactions.
  • Enzyme spacing significantly influences the efficiency of multienzyme systems immobilized on microgel supports.
  • These findings provide insights into designing advanced bioconjugates for enhanced biocatalytic performance.