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Related Concept Videos

Enzyme Kinetics01:19

Enzyme Kinetics

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Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
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Oxidation and Reduction of Organic Molecules01:19

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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
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Electron Transport Chain: Complex III and IV01:43

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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Introduction to Enzyme Kinetics01:19

Introduction to Enzyme Kinetics

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Enzyme kinetics studies the rates of biochemical reactions. Scientists monitor the reaction rates for a particular enzymatic reaction at various substrate concentrations. Additional trials with inhibitors or other molecules that affect the reaction rate may also be performed.
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Catalytically Perfect Enzymes01:07

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The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
 
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Light-driven Enzymatic Decarboxylation
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Electricity-driven enzymatic dynamic kinetic oxidation.

Beibei Zhao1, Yuanyuan Xu1, Qin Zhu1

  • 1State Key Laboratory of Coordination Chemistry, Chemistry and Biomedicine Innovation Center (ChemBIC), School of Chemistry and Chemical Engineering, Frontier Interdisciplinary Science Research Center, Nanjing University, Nanjing, China.

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|May 28, 2025
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Summary
This summary is machine-generated.

This study introduces a novel electroenzymatic method using ferrocene to reshape thiamine-dependent enzymes. This approach enables unnatural oxidation of aldehydes, producing bioactive (S)-profens with high enantiomeric excess.

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Area of Science:

  • Synthetic Chemistry
  • Biocatalysis
  • Electrochemistry

Background:

  • Enzyme repurposing and synthetic strategies expand chemical space.
  • Integrating electrochemistry with enzymes is challenging due to compatibility and electron transfer issues.
  • Existing electroenzymatic methods often replicate known enzyme functions.

Purpose of the Study:

  • To develop a novel electroenzymatic approach for unlocking new enzyme reactivity.
  • To reshape thiamine-dependent enzymes for unnatural oxidation reactions.
  • To synthesize bioactive profens using an electroenzymatic strategy.

Main Methods:

  • Ferrocene-mediated electrocatalysis was employed to modify thiamine-dependent enzymes.
  • The modified enzymes were used for the dynamic kinetic oxidation of α-branched aldehydes.
  • The process was optimized for enzyme loading and tested with whole cells.

Main Results:

  • The electroenzymatic method achieved unnatural dynamic kinetic oxidation of α-branched aldehydes.
  • Bioactive (S)-profens were synthesized with up to 99% enantiomeric excess.
  • The approach demonstrated applicability with whole cells and low enzyme loadings (0.05 mol%).

Conclusions:

  • The developed electroenzymatic strategy successfully reshaped enzyme function for novel reactivity.
  • This method provides an efficient route to enantiomerically pure profens.
  • Mechanistic studies revealed precise substrate discrimination, racemization acceleration, and efficient electron transfer.