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Introduction to Enzyme Kinetics01:19

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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.
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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.
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Most chemical reactions in cells require enzymes—biological catalysts that speed up the reaction without being consumed or permanently changed. They reduce the activation energy needed to convert the reactants into products. Enzymes are proteins, that usually work by binding to a substrate—a reactant molecule that they act upon.
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Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...
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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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Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
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Modelos portátiles para los efectos de la entropía en la selectividad cinética

Dean J Tantillo1

  • 1Department of Chemistry, University of California-Davis, 1 Shields Ave, Davis, California 95616, United States.

Journal of the American Chemical Society
|July 27, 2022
PubMed
Resumen
Este resumen es generado por máquina.

El control de las reacciones químicas depende de la comprensión de las diferencias de entropía en los estados de transición. Este estudio analiza los desafíos y las soluciones para modelar estas contribuciones complejas de entropía para guiar la selectividad cinética.

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Área de la Ciencia:

  • La cinética química
  • La termodinámica
  • Química computacional

Sus antecedentes:

  • La selectividad cinética en las reacciones químicas está influenciada por las diferencias de entropía entre los estados de transición en competencia.
  • La entropía es una propiedad estadística, por lo que su modelado a nivel molecular es complejo.
  • Múltiples factores, incluidos los estados vibratorios y las vías accesibles, contribuyen a la entropía.

Objetivo del estudio:

  • Para discutir los desafíos en el modelado de las diferencias de entropía a nivel molecular.
  • Proponer soluciones para predecir con precisión las contribuciones entrópicas a la selectividad cinética.
  • Para ayudar a los experimentadores en el diseño de reacciones utilizando la entropía para el control.

Principales métodos:

  • Análisis de la naturaleza estadística de la entropía.
  • Consideración de múltiples estados vibratorios en las estructuras de transición.
  • Evaluación de las vías de acceso dinámico.
  • Examen de las contribuciones conformacionales/configuracionales.

Principales resultados:

  • Las complejidades identificadas en el modelado de las diferencias de entropía debidas a factores estadísticos.
  • Destacó el impacto de las múltiples estructuras y vías de transición.
  • Se discutieron las dificultades para cuantificar las contribuciones entrópicas.

Conclusiones:

  • El modelado preciso de las diferencias de entropía es crucial para controlar la selectividad cinética.
  • Superar los desafíos de modelado puede conducir al desarrollo de herramientas predictivas.
  • Los modelos cualitativos portátiles pueden ayudar a los experimentadores en el diseño de la reacción.