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The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
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Directed Protein Packaging within Outer Membrane Vesicles from Escherichia coli: Design, Production and Purification
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Directed Protein Packaging within Outer Membrane Vesicles from Escherichia coli: Design, Production and Purification

Published on: November 16, 2016

Evolución dirigida de un contenedor de proteínas.

Bigna Wörsdörfer1, Kenneth J Woycechowsky, Donald Hilvert

  • 1Laboratory of Organic Chemistry, Eidgenössische Technische Hochschule (ETH) Zürich, 8093 Zürich, Switzerland.

Science (New York, N.Y.)
|February 5, 2011
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores diseñaron nanocompartimentos de proteínas para contener de manera segura enzimas tóxicas como la proteasa del VIH dentro de las células. Este método mejoró el crecimiento de las células huésped y condujo al desarrollo de cápsidas mejoradas con mayor capacidad de carga de enzimas para aplicaciones biotecnológicas.

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Área de la Ciencia:

  • Biología sintética Biología sintética.
  • Biotecnología La biotecnología es la biotecnología.
  • La ingeniería de proteínas es la ingeniería de proteínas.

Sus antecedentes:

  • El confinamiento de enzimas en nanocompartimentos de proteínas ofrece una estrategia para controlar la actividad catalítica celular.
  • Las enzimas tóxicas, como la proteasa del VIH, plantean desafíos para la producción intracelular debido a la toxicidad del huésped.

Objetivo del estudio:

  • Desarrollar un método para secuestrar enzimas tóxicas dentro de capsidas de proteínas diseñadas.
  • Mejorar las propiedades de la cápside a través de la evolución dirigida para mejorar la contención de enzimas y la protección del huésped.
  • Explorar el potencial de los nanocompartimentos diseñados para aplicaciones biotecnológicas en células vivas.

Principales métodos:

  • Utilizó un sistema de etiquetado basado en electrostática para la encapsulación de proteínas.
  • Capsidos de lumazina sintetasa diseñados para secuestrar la proteasa del VIH en Escherichia coli.
  • Empleado la evolución dirigida, que implica la mutagénesis y la selección, para mejorar el rendimiento de la cápside.

Principales resultados:

  • Secuestró con éxito la proteasa tóxica del VIH dentro de los capsidos sintasa de lumazina diseñados.
  • Logró un aumento de 5 a 10 veces en la capacidad de carga de la cápside después de cuatro rondas de evolución.
  • Se ha demostrado un crecimiento eficiente de las células huésped a pesar de las altas concentraciones intracelulares de proteasa del VIH.
  • Se identificaron mutaciones que aumentan la carga negativa neta en la superficie luminal de la cápside, mejorando las interacciones electrostáticas.

Conclusiones:

  • Los nanocompartimentos de proteínas diseñados proporcionan una plataforma robusta para manejar la actividad tóxica de las enzimas dentro de las células.
  • La evolución dirigida puede producir cápsidos mejorados con una capacidad de carga de enzimas significativamente mejorada.
  • Estos nanocompartimentos avanzados son prometedores para diversas aplicaciones biotecnológicas en sistemas vivos.