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Related Concept Videos

Allosteric Regulation01:08

Allosteric Regulation

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Allosteric regulation of enzymes occurs when the binding of an effector molecule to a site that is different from the active site causes a change in the enzymatic activity. This alternate site is called an allosteric site, and an enzyme can contain more than one of these sites. Allosteric regulation can either be positive or negative, resulting in an increase or decrease in enzyme activity. Most enzymes that display allosteric regulation are metabolic enzymes involved in the degradation or...
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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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Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
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Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
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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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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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Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation
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Dissecting the Allosteric Fine-Tuning of Enzyme Catalysis.

Xin-Qiu Yao1,2, Donald Hamelberg1

  • 1Department of Chemistry, Georgia State University, Atlanta, Georgia 30302-3965, United States.

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Allosteric effectors fine-tune enzyme catalysis by altering both energetic and dynamic factors. Understanding these combined effects is crucial for enzyme function and drug development.

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Area of Science:

  • Biochemistry
  • Molecular Dynamics
  • Enzyme Kinetics

Background:

  • Allosteric regulation fine-tunes biomolecular function by altering enzyme structure and dynamics.
  • Understanding the interplay of energetic and dynamic factors in allosteric regulation is essential for fundamental and pharmaceutical sciences.

Purpose of the Study:

  • To characterize the allosteric fine-tuning of enzyme catalysis using human Pin1 as a model.
  • To investigate how allosteric effector binding modifies reaction kinetics and underlying factors.

Main Methods:

  • Performed over half-millisecond all-atom molecular dynamics simulations.
  • Examined changes in free energy landscapes and diffusion coefficients under varying binding conditions.
  • Utilized advanced statistical techniques to detect function-related conformational dynamics.

Main Results:

  • Demonstrated that both energetic and dynamical factors are equally modulated by allosteric effectors.
  • Showed that the combined effect of these factors dictates the overall allosteric output.
  • Revealed the dynamic basis for allosteric modulation through advanced statistical analysis.

Conclusions:

  • Energetic and dynamic factors play a significant, balanced role in allosteric enzyme regulation.
  • The developed methods can be applied to study other allosteric systems.
  • Provides a microscopic understanding of allosteric regulation with potential pharmaceutical applications.