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Related Concept Videos

Enzymes02:34

Enzymes

Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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...
Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

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.
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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...
Bioreactor Controls-II01:18

Bioreactor Controls-II

In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the fermentor via a sparger...

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Related Experiment Video

Updated: Jul 20, 2026

A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry
08:04

A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry

Published on: March 13, 2014

Covalent intermediates and enzyme proficiency.

Thomas C Bruice1, Paula Yurkanis Bruice

  • 1Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, USA. tcbruice@chem.ucsb.edu

Journal of the American Chemical Society
|September 8, 2005
PubMed
Summary

Enzyme efficiency stems from slow reaction rates in water, not from forming covalent intermediates. This finding clarifies the mechanisms behind enzyme catalysis.

Area of Science:

  • Biochemistry
  • Enzymology
  • Chemical Kinetics

Background:

  • Enzymes are biological catalysts that accelerate biochemical reactions.
  • Understanding enzyme efficiency is crucial for various biological and medical applications.
  • The role of covalent intermediates in enzyme catalysis has been a long-standing question.

Purpose of the Study:

  • To investigate the primary factors contributing to high enzyme efficiencies.
  • To determine whether covalent intermediate formation or reaction rate constants are key.
  • To elucidate the catalytic mechanisms of enzymes, particularly in aqueous environments.

Main Methods:

  • Analysis of kinetic data for various enzymatic reactions.
  • Computational modeling of enzyme-catalyzed reactions.

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  • Comparison of reaction rates in water versus enzyme-bound states.

    • Main Results:

    • Enzyme efficiencies are primarily attributed to small rate constants for the reaction in water.
    • The formation of covalent intermediates does not appear to be a significant factor in achieving high enzyme efficiencies.
    • Rate-limiting steps in enzymatic reactions are often associated with solvent interactions.

    Conclusions:

    • High enzyme efficiency is achieved through optimizing the reaction environment, leading to reduced rate constants in water.
    • The absence of a reliance on covalent intermediates simplifies the understanding of many enzymatic catalytic mechanisms.
    • Further research can focus on modulating solvent effects to enhance enzyme activity.