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Related Concept Videos

What are Proteins?01:28

What are Proteins?

Proteins are polymers of amino acids linked together by peptide bonds. Proteins and polypeptides are interchangeably used to refer to long chains of amino acids. However, polypeptides have a molecular weight of fewer than 10,000 daltons, while proteins have greater molecular weight.  Polypeptides with less than 20 amino acids are called oligopeptides or simply peptides. Interactions among the constituent amino acid side chains of proteins help them fold into a stable 3-dimensional structure...
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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 a mild...
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Related Experiment Video

Updated: Jun 1, 2026

Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase
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Published on: December 4, 2017

Protein's electronic polarization contributes significantly to its catalytic function.

Yun Xiang1, Lili Duan, John Z H Zhang

  • 1State Key Laboratory of Precision Spectroscopy and Department of Physics, Institute of Theoretical and Computational Science, East China Normal University, Shanghai 200062, China. yxiang@phy.ecnu.edu.cn

The Journal of Chemical Physics
|June 7, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces an enhanced computational method combining quantum mechanics and molecular mechanics with polarized charges to accurately simulate enzyme catalysis. Results show this approach precisely predicts proton transfer in triosephosphate isomerase, highlighting polarization

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Area of Science:

  • Computational Chemistry
  • Biochemistry
  • Enzyme Catalysis

Background:

  • Enzyme catalysis is crucial for biological processes.
  • Accurate simulation of enzyme reactions is computationally challenging.
  • Understanding enzyme mechanisms requires precise modeling of electronic effects.

Purpose of the Study:

  • To develop and validate an improved computational method for studying enzyme-catalyzed reactions.
  • To investigate the role of electronic polarization in enzyme catalysis.
  • To achieve accurate free-energy simulations of enzymatic reactions.

Main Methods:

  • Combined ab initio quantum mechanical/molecular mechanical (QM/MM) method.
  • Incorporation of polarized protein-specific charges.
  • Calculation of the free-energy profile for proton transfer in triosephosphate isomerase.

Main Results:

  • Demonstrated significant improvements in accuracy and efficiency of free-energy simulations.
  • Achieved quantitative agreement between simulation results and experimental data.
  • Identified electronic polarization as a key factor in lowering activation energy barriers.

Conclusions:

  • The developed QM/MM method with polarized charges accurately models enzyme catalysis.
  • Electronic polarization contributes significantly to enzyme catalytic power by reducing energy barriers.
  • This approach provides a reliable tool for studying complex enzymatic reactions.