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Videos de Conceptos Relacionados

Catalysis02:50

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
Enzymes02:34

Enzymes

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...
Introduction to Enzyme Kinetics01:19

Introduction to Enzyme Kinetics

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...
Introduction to Mechanisms of Enzyme Catalysis01:13

Introduction to Mechanisms of Enzyme Catalysis

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...
Introduction to Mechanisms of Enzyme Catalysis01:13

Introduction to Mechanisms of Enzyme Catalysis

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...
Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...

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Updated: Jul 7, 2026

Steady-state, Pre-steady-state, and Single-turnover Kinetic Measurement for DNA Glycosylase Activity
14:27

Steady-state, Pre-steady-state, and Single-turnover Kinetic Measurement for DNA Glycosylase Activity

Published on: August 19, 2013

Dinámica de las enzimas durante la catálisis.

Elan Zohar Eisenmesser1, Daryl A Bosco, Mikael Akke

  • 1Department of Biochemistry, Brandeis University, Waltham, MA 02454, USA.

Science (New York, N.Y.)
|February 23, 2002
PubMed
Resumen
Este resumen es generado por máquina.

La dinámica de las proteínas internas de las enzimas es crucial para la catálisis. Este estudio revela fluctuaciones conformacionales del sitio activo en la ciclofilina A durante la catálisis, correlacionándose con las tasas de rotación del sustrato y permitiendo la predicción de la trayectoria de reacción.

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Last Updated: Jul 7, 2026

Steady-state, Pre-steady-state, and Single-turnover Kinetic Measurement for DNA Glycosylase Activity
14:27

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Área de la Ciencia:

  • Bioquímica y Biología Molecular.
  • Enzimología Enzimología.
  • Dinámica de las proteínas Dinámica de las proteínas.

Sus antecedentes:

  • La catálisis enzimática está intrínsecamente vinculada a la dinámica interna de las proteínas.
  • La comprensión de los movimientos enzimáticos durante la rotación del sustrato es esencial para elucidar los mecanismos catalíticos.
  • Las dinámicas específicas de las enzimas relacionadas con la actividad catalítica siguen sin caracterizarse en gran medida.

Objetivo del estudio:

  • Para investigar la dinámica de las enzimas a resolución atómica durante la catálisis.
  • Para identificar y caracterizar las fluctuaciones conformacionales en el sitio activo de la enzima.
  • Para correlacionar las tasas de movimiento de las enzimas con las tasas de rotación del sustrato.

Principales métodos:

  • Utilizó métodos de relajación de resonancia magnética nuclear (RMN) para estudiar la dinámica de las enzimas.
  • Aplicó técnicas de resolución atómica para analizar el movimiento de las proteínas.
  • Centrado en la enzima ciclofilina A durante su acción catalítica.

Principales resultados:

  • Se detectaron fluctuaciones conformacionales del sitio activo de la ciclofilina A en una escala de tiempo de microsegundos durante la catálisis.
  • Se observó una fuerte correlación entre las tasas de estas dinámicas conformacionales y las tasas microscópicas de rotación del sustrato.
  • Proporciona datos que, combinados con información estructural, permiten la predicción de la trayectoria de reacción.

Conclusiones:

  • La dinámica interna de las proteínas, específicamente las fluctuaciones del sitio activo, juegan un papel importante en la catálisis enzimática.
  • Las dinámicas identificadas a escala de microsegundos están directamente relacionadas con la eficiencia catalítica de la enzima.
  • Esta investigación ofrece una vía para predecir trayectorias de reacción enzimática basadas en propiedades dinámicas.