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Cooperative Allosteric Transitions01:58

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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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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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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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Video Experimental Relacionado

Updated: Jan 21, 2026

PCR Mutagenesis, Cloning, Expression, Fast Protein Purification Protocols and Crystallization of the Wild Type and Mutant Forms of Tryptophan Synthase
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PCR Mutagenesis, Cloning, Expression, Fast Protein Purification Protocols and Crystallization of the Wild Type and Mutant Forms of Tryptophan Synthase

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Descifrando el conjunto conformacional impulsado alostéricamente en la evolución de la triptófano sintasa

Miguel A Maria-Solano1, Javier Iglesias-Fernández1, Sílvia Osuna1,2

  • 1CompBioLab group, Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química , Universitat de Girona , Girona 17003 , Spain.

Journal of the American Chemical Society
|July 30, 2019
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores mejoraron la eficiencia de la subunidad beta independiente de la triptófano sintasa (TrpS) mediante la restauración de su regulación alostérica a través de mutaciones distales. Este enfoque permite mejorar la función enzimática para aplicaciones biosintéticas.

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Área de la Ciencia:

  • Enzimología
  • Biología estructural
  • Biocatálisis

Sus antecedentes:

  • Los complejos enzimáticos multiméricos, como la triptófano sintasa (TrpS), exhiben una catálisis eficiente a través del acoplamiento alostérico, pero son ineficientes en aislamiento.
  • TrpS, un complejo αββ, sintetiza L-triptófano, con su actividad catalítica dependiente de la regulación alostérica entre subunidades.

Objetivo del estudio:

  • Para investigar la regulación alostérica del TrpS de *Pyrococcus furiosus* (PfTrpS).
  • Comprender cómo las variantes independientes de subunidad beta desarrolladas en laboratorio recuperan el conjunto conformacional alostérico para mejorar la eficiencia catalítica.

Principales métodos:

  • Análisis computacional del conjunto conformacional PfTrpS.
  • Evolución en el laboratorio de variantes independientes de subunidad beta.
  • Caracterización de las mutaciones que afectan los estados conformacionales y la eficiencia catalítica.

Principales resultados:

  • La recuperación del conjunto conformacional de un subdominio TrpS es crucial para mejorar la actividad de la subunidad beta independiente.
  • Se identificaron mutaciones distales que restablecen la regulación alostérica y alteran la dinámica conformacional.
  • Estas mutaciones mejoran las poblaciones y las tasas de cambio entre los estados conformacionales esenciales.

Conclusiones:

  • Se desarrolló un enfoque racional para evolucionar las enzimas alostéricas hacia una función independiente mejorada.
  • Esta estrategia es aplicable para el diseño de enzimas para aplicaciones biosintéticas.
  • Comprender y manipular conjuntos conformacionales de enzimas es clave para la ingeniería de proteínas.