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Related Concept Videos

Introduction to Mechanisms of Enzyme Catalysis01:13

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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Kinetic Model for the Heterogeneous Biocatalytic Reactions Using Tethered Cofactors.

Rowan McDonough1, Charlotte C Williams2, Carol J Hartley3

  • 1Institute for Nanoscale Science and Technology, School of Chemical and Physical Sciences, Flinders University, Bedford Park, SA 5042, Australia.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 25, 2024
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Summary
This summary is machine-generated.

Investigating enzyme kinetics on silica nanoparticles (SiNPs) reveals enhanced efficiency for synthetic biology. Tethered nicotinamide adenine dinucleotide (NAD+) boosts enzyme performance, crucial for value-added chemical production.

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Area of Science:

  • Biocatalysis
  • Enzyme kinetics
  • Synthetic biology

Background:

  • Interfacial enzyme kinetics are vital for synthetic biological systems.
  • NAD+-dependent enzymes are key catalysts in biochemical pathways.

Purpose of the Study:

  • To investigate the interfacial kinetics of NAD+-dependent enzymes.
  • To understand catalysis involving NAD+ tethered to silica nanoparticles (SiNPs).

Main Methods:

  • Utilized two kinetic approaches: enzyme excess and reactant (NAD+) excess.
  • Developed kinetic models to characterize adsorption, complexation, and catalysis.
  • Analyzed enzyme and cofactor interactions on SiNP surfaces.

Main Results:

  • Observed a concentrating effect, leading to high local enzyme and NAD+ concentrations on SiNPs.
  • Demonstrated rate enhancement of enzyme/NAD+ complexation and catalysis due to surface-bound NAD+.
  • Achieved higher enzyme efficiency in the tethered NAD+ system compared to free enzyme systems.

Conclusions:

  • Enzyme adsorption onto solid substrates with tethered catalysts, like NAD+, can significantly enhance enzyme efficiency.
  • This approach holds potential for developing highly efficient flow biocatalytic systems.
  • Understanding interfacial kinetics is critical for designing advanced synthetic biological applications.