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Videos de Conceptos Relacionados

C–C Bond Cleavage: Retro-Aldol Reaction00:57

C–C Bond Cleavage: Retro-Aldol Reaction

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The reverse of the aldol addition reaction is called the retro-aldol reaction. Here, the carbon–carbon bond in the aldol product is cleaved under acidic or basic conditions to form two molecules of carbonyl compounds. The mechanism of the reaction consists of three steps.
In the first step, as depicted in Figure 1, the base deprotonates the β-hydroxy ketone at the hydroxyl group to form an alkoxide ion.
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Allosteric Proteins-ATCase01:19

Allosteric Proteins-ATCase

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Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to  N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
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Base-Catalyzed Aldol Addition Reaction01:08

Base-Catalyzed Aldol Addition Reaction

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As depicted in Figure 1, base-catalyzed aldol addition involves adding two carbonyl compounds in aqueous sodium hydroxide to form a β-hydroxy carbonyl compound.
3.7K
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Ligand Binding and Linkage00:49

Ligand Binding and Linkage

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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Las mutaciones distales en una retro-aldolasa diseñada alteran la dinámica del bucle para cambiar y acelerar el paso

Serena E Hunt1,2, Cindy Klaus1,2, Aqza E John3

  • 1Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada.

Journal of the American Chemical Society
|August 13, 2025
PubMed
Resumen

Las mutaciones distales en las enzimas, distantes del sitio activo, mejoran la eficiencia catalítica cuando se combinan con mutaciones en el sitio activo. Estos residuos distales son cruciales para el diseño de la enzima al influir en la estructura y la dinámica de la enzima.

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Área de la Ciencia:

  • Catálisis enzimática
  • Ingeniería de proteínas
  • La bioquímica

Sus antecedentes:

  • Los residuos de aminoácidos distantes del sitio activo de una enzima pueden influir en la catálisis, pero sus mecanismos no están claros.
  • La evolución dirigida y el diseño computacional son herramientas poderosas para la ingeniería enzimática.

Objetivo del estudio:

  • Investigar los impactos estructurales, funcionales y mecánicos de las mutaciones distales y del sitio activo en la retro-aldolasa RA95.
  • Elucidar el papel de los residuos distales en la catálisis enzimática y la dinámica del sitio activo.

Principales métodos:

  • Evolución dirigida de la retro-aldoasa RA95.
  • Cristalografía de rayos X y simulaciones de dinámica molecular.
  • Efectos cinéticos de la viscosidad del disolvente y cálculos del campo eléctrico.

Principales resultados:

  • Las mutaciones en el sitio activo mejoraron la eficiencia catalítica 3.600 veces; las mutaciones distales por sí solas no mostraron mejoría.
  • Las mutaciones combinadas en el sitio activo y distal produjeron un aumento adicional de 6 veces en la eficiencia (epistasis).
  • Las mutaciones distales promueven la apertura del sitio activo al alterar la dinámica del bucle, acelerando la transformación química 100 veces.

Conclusiones:

  • Los residuos distales juegan un papel crítico en la configuración del entorno del sitio activo de la enzima.
  • Las mutaciones distales facilitan la dinámica estructural esencial para una catálisis enzimática eficiente.
  • Los hallazgos ofrecen información valiosa para el diseño racional de enzimas con propiedades catalíticas mejoradas.