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Related Concept Videos

Enzymes02:34

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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.
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Steady-state, Pre-steady-state, and Single-turnover Kinetic Measurement for DNA Glycosylase Activity
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Key difference between transition state stabilization and ground state destabilization: increasing atomic charge

Deliang Chen1, Yibao Li1, Xun Li1

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Enzymes catalyze reactions by stabilizing transition states (TSs) or destabilizing ground states (GSs), both reducing free energy barriers (ΔG‡s). They achieve this by enhancing atomic charge densities, differing in when this enhancement occurs during enzyme-substrate binding.

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Area of Science:

  • Biochemistry
  • Enzyme kinetics
  • Computational chemistry

Background:

  • Enzyme catalysis is crucial for biological reactions.
  • The mechanisms of enzyme catalysis, specifically transition state (TS) stabilization and ground state (GS) destabilization, are debated.
  • Understanding these mechanisms is key to enzyme function and artificial enzyme design.

Purpose of the Study:

  • To investigate the commonalities and differences between TS stabilization and GS destabilization in enzyme catalysis.
  • To elucidate the role of atomic charge density enhancement in reducing free energy barriers (ΔG‡s).
  • To provide a unified view of enzyme catalysis mechanisms.

Main Methods:

  • Exploration of enzyme-substrate noncovalent interactions.
  • Analysis of catalytic mechanisms through computational and experimental approaches.
  • Comparison of charge density changes in catalytic atoms during reaction progression.

Main Results:

  • Both TS stabilization and GS destabilization reduce reaction free energy barriers (ΔG‡s).
  • Enzymes enhance the charge densities of catalytic atoms to lower ΔG‡s.
  • TS stabilization enhances charge density before substrate binding, while GS destabilization enhances it during binding.

Conclusions:

  • TS stabilization and GS destabilization are not mutually exclusive but complementary mechanisms.
  • Enzyme catalysis involves both reducing ΔG‡s and enhancing atomic charge densities.
  • These findings reconcile the debate on enzyme catalysis and aid in designing artificial enzymes.