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Enzymes02:34

Enzymes

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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.
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
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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.
The experimenter can then plot the initial reaction rate or velocity (Vo) of a given trial against the substrate concentration ([S]) to obtain a graph of the reaction properties. For many enzymatic reactions involving a...
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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.
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...
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Introduction to Mechanisms of Enzyme Catalysis01:13

Introduction to Mechanisms of Enzyme Catalysis

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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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Introduction to Enzymes01:22

Introduction to Enzymes

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The use of enzymes by humans dates to 7000 BCE. Humans first used enzymes to ferment sugars and produce alcohol without knowing that this was an enzyme-catalyzed reaction. Wilhelm Kuhne coined the term 'enzyme' in 1877 from the Greek words ‘en’ meaning ‘in’ or ‘within’ and ‘zyme’ meaning ‘yeast.’
Most enzymes are proteins that speed up biochemical reactions without being consumed. Enzymes contain one or more active sites that...
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Enzymes and Activation Energy01:13

Enzymes and Activation Energy

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The activation energy (or free energy of activation), abbreviated as Ea, is the small amount of energy input necessary for all chemical reactions to occur. During chemical reactions, certain chemical bonds break, and new ones form. For example, when a glucose molecule breaks down, bonds between the molecule's carbon atoms break. Since these are energy-storing bonds, they release energy when broken. However, the molecule must be somewhat contorted to get into a state that allows the bonds to...
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Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
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Understanding how enzymes work: the journey to ensemble-function studies

Daniel Herschlag1,2,3, Siyuan Du1,4

  • 1Department of Biochemistry, Stanford University, California, USA.

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Resumen

This study introduces ensemble-function analyses to explain enzyme catalysis, revealing how specific molecular interactions in serine proteases significantly enhance reaction rates. These findings offer a quantitative framework for understanding enzyme mechanisms and biological functions.

Palabras clave:
conformational ensembleenergy landscapeenzyme catalysisenzyme positioningground state destabilizationstatistical mechanicsstructure–function

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Área de la Ciencia:

  • Biochemistry
  • Enzyme kinetics
  • Structural biology

Sus antecedentes:

  • Traditional descriptions of serine protease mechanisms, like the 'catalytic triad' and 'oxyanion hole', do not fully explain their immense rate enhancements (~10^12-fold).
  • A deeper understanding of the physical and chemical interactions within enzyme active sites is needed to quantitatively account for catalytic efficiency.

Objetivo del estudio:

  • To develop and present a framework of ensemble-function analyses for quantitatively dissecting enzyme catalysis.
  • To identify and quantify the contributions of specific molecular features in serine proteases that enable high catalytic efficiency.

Principales métodos:

  • Analysis of basic physical and chemical interactions in serine protease active sites.
  • Application of statistical mechanics principles to quantify the contributions of individual catalytic features.
  • Development of a 'catalytic ledger' to provide a quantitative accounting of enzyme catalysis.

Principales resultados:

  • Identified previously unrecognized catalytic interactions, including destabilizing ground-state features (unfavorable rotamers, suboptimal distances/bonds), which are relieved in the transition state.
  • Quantified the contributions of these features, revealing how they collectively lower the activation barrier for enzymatic reactions.
  • Observed analogous catalytic features across diverse enzymes from different families and folds, suggesting convergent evolution.

Conclusiones:

  • Ensemble-function analyses provide a quantitative method to dissect enzyme catalysis, moving beyond simplified textbook models.
  • These analyses reveal that enzymes utilize destabilizing ground-state interactions that are resolved in the transition state to achieve high catalytic efficiency.
  • The identified strategies are broadly applicable across various enzymes and can inform future research on enzyme mechanisms, allostery, and molecular machines.