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Ribozymes02:47

Ribozymes

The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
Ribozymes can be...
Ribozymes02:47

Ribozymes

The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
Ribozymes can be...
Diels–Alder vs Retro-Diels–Alder Reaction: Thermodynamic Factors01:31

Diels–Alder vs Retro-Diels–Alder Reaction: Thermodynamic Factors

The Diels–Alder reaction is thermally reversible, meaning that the reaction reverts to the starting diene and dienophile under suitable temperatures. The forward reaction gives a cyclohexene derivative and is favored at low to medium temperatures. The reverse process, also called retro-Diels–Alder reaction, is a ring-opening process favored at high temperatures.
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The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
Diels–Alder Reaction: Characteristics of Dienophiles01:24

Diels–Alder Reaction: Characteristics of Dienophiles

In a Diels–Alder reaction, the diene is usually an electron-rich system and acts as a nucleophile, whereas the dienophile is electron-deficient and functions as an electrophile. Much like the diene, the nature of the dienophile significantly impacts the outcome of the reaction.
Characteristics of Dienophiles
Generally, the best dienophiles are alkenes containing electron-withdrawing substituents such as carbonyl, nitrile, and nitro groups. The feasibility of a Diels–Alder reaction depends on...

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La catálisis de la ribozima de Diels-Alder: un enfoque computacional para el análisis.

Xiaohua Zhang1, Thomas C Bruice

  • 1Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, USA.

Journal of the American Chemical Society
|January 25, 2007
PubMed
Resumen

Este estudio compara computacionalmente las reacciones de la ribozima Diels-Alderasa y el agua. El sitio activo de la ribozima se une a los reactivos en posiciones y ángulos óptimos, mejorando la catálisis en comparación con el agua.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Química computacional es la química computacional.
  • Enzimología Enzimología.

Sus antecedentes:

  • La reacción Diels-Alder es una reacción crucial para la formación de enlaces carbono-carbono.
  • Las ribozimas, enzimas de ARN, pueden catalizar varias transformaciones químicas, incluidas las reacciones de Diels-Alder.
  • Comprender los mecanismos del sitio activo de la enzima es clave para diseñar catalizadores eficientes.

Objetivo del estudio:

  • Para comparar computacionalmente el mecanismo de reacción de Diels-Alder catalizado por una ribozima Diels-Alderasa con la reacción no catalizada en agua.
  • Para aclarar el papel de la estructura del sitio activo de la ribozima y la dinámica en la catálisis.
  • Para investigar los orígenes de la mejora de la velocidad por la ribozima Diels-Alderasa.

Principales métodos:

  • Modelado computacional utilizando SCCDFTB/MM (Densidad de carga autoconsistente, enlaces cerrados funcionales y mecánica molecular).
  • Técnica de muestreo general para calcular las barreras de la energía libre.
  • Análisis de coordenadas de reacción, estados de transición y cargas atómicas.

Principales resultados:

  • El sitio activo de la ribozima mantiene a los reactivos en conformaciones favorables, con un ángulo de aproximación inclinado específico para el antraceno.
  • El sitio activo estabiliza el producto más que el estado de transición.
  • Las barreras de energía libre calculadas para la reacción catalizada por ribozima coinciden estrechamente con los valores experimentales.
  • Se encontró que la dinámica del sitio activo contribuye mínimamente a la catálisis.

Conclusiones:

  • La ribozima Diels-Alderasa aumenta las velocidades de reacción mediante la preorganización de los reactivos en el sitio activo.
  • La geometría específica del sitio activo y el posicionamiento del reactivo son críticos para la competencia catalítica.
  • Los métodos computacionales reproducen con precisión las observaciones experimentales para las reacciones de Diels-Alder catalizadas por ribozima.