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Induced-fit Model01:13

Induced-fit Model

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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.
Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical...
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Cooperative Allosteric Transitions

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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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The Two-State Receptor Model01:29

The Two-State Receptor Model

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The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
The binding affinity of a drug determines its interaction with...
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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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The Equilibrium Binding Constant and Binding Strength02:18

The Equilibrium Binding Constant and Binding Strength

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The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
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Visualizing the Conformational Dynamics of Membrane Receptors Using Single-Molecule FRET
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Programación de la cinética de la comunicación química: ajuste inducido frente a la selección conformal

Carl Prévost-Tremblay1, Achille Vigneault2, Dominic Lauzon3

  • 1Département de Biochimie et Médecine Moléculaire, Université de Montréal, Montréal, QC H2V 0B3, Canada.

Journal of the American Chemical Society
|December 19, 2024
PubMed
Resumen

Los investigadores desarrollaron un interruptor de ADN que demuestra el control programable sobre la cinética del interruptor molecular. Este trabajo aclara las ventajas de los mecanismos de ajuste inducido (IF) y selección conformacional (CS) para el diseño de sistemas moleculares artificiales.

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Área de la Ciencia:

  • Biología molecular
  • Ingeniería química
  • Nanotecnología

Sus antecedentes:

  • Los interruptores biomoleculares controlan las funciones celulares a través de señales químicas.
  • Dos mecanismos principales, el ajuste inducido (IF) y la selección conformacional (CS), gobiernan la cinética del interruptor.
  • Las ventajas cinéticas y evolutivas de IF y CS siguen siendo poco conocidas.

Objetivo del estudio:

  • Para crear un interruptor de ADN modular controlado por los mecanismos IF y CS.
  • Caracterizar los parámetros termodinámicos y cinéticos de estos mecanismos.
  • Para demostrar el control programable sobre la cinética de los interruptores moleculares.

Principales métodos:

  • Diseñó y sintetizó un interruptor molecular modular basado en ADN.
  • Investigación del comportamiento del conmutador en condiciones que favorecen a IF y CS.
  • Parámetros termodinámicos y cinéticos cuantificados.
  • Diseñado un recipiente de entrega de drogas utilizando el interruptor de ADN.

Principales resultados:

  • La activación más rápida del interruptor ocurrió a través del mecanismo de ajuste inducido (IF).
  • La selección conformacional (CS) permitió la programación de magnitud de varios órdenes de las tasas de activación.
  • Un recipiente de administración de fármacos demostró la liberación programable de fármacos en escalas de tiempo > 1000 veces.

Conclusiones:

  • Desarrolló una estrategia programable para optimizar la cinética de los interruptores moleculares.
  • Demostró la utilidad de los mecanismos IF y CS en el diseño de sistemas moleculares artificiales.
  • Proporcionó información sobre las ventajas evolutivas de IF y CS en interruptores biomoleculares.