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Se requiere potencial de membrana para la función de MurJ

Frederick A Rubino1, Sujeet Kumar2, Natividad Ruiz2

  • 1Department of Chemistry and Chemical Biology , Harvard University , Cambridge , Massachusetts 02138 , United States.

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|March 21, 2018
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Resumen
Este resumen es generado por máquina.

Los nuevos antibióticos dirigidos a MurJ (una flipase) son cruciales para las infecciones Gram-negativas. Los investigadores desarrollaron un nuevo ensayo para cuantificar la inhibición de MurJ mediante la medición de la acumulación de lípidos II, lo que ayuda al desarrollo de antibióticos.

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Área de la Ciencia:

  • Microbiología
  • La bioquímica
  • Descubrimiento de drogas

Sus antecedentes:

  • MurJ es una flipasa bacteriana esencial para la exportación de Lípido II, un componente clave de la pared celular.
  • El desarrollo de nuevos antibióticos contra las bacterias Gram-negativas es una necesidad médica crítica no satisfecha.
  • Los métodos existentes para cuantificar la actividad de MurJ son limitados debido a la falta de alteración química del sustrato durante el transporte.

Objetivo del estudio:

  • Desarrollar un ensayo cuantitativo para el seguimiento de la actividad de la flipasa MurJ.
  • Para identificar las condiciones y compuestos que inhiben la función de MurJ.
  • Comprender los cambios conformacionales de MurJ en respuesta a la inhibición.

Principales métodos:

  • Se empleó una estrategia de etiquetado de biotina para cuantificar la acumulación intracelular de lípido II como medida de la inhibición de MurJ.
  • El ensayo se utilizó para probar el efecto del potencial de membrana en la actividad de MurJ.
  • Se realizaron pruebas de accesibilidad a la cisteína para analizar la conformación de MurJ.

Principales resultados:

  • Un nuevo ensayo cuantificó con éxito la inhibición de MurJ mediante la medición de la acumulación intracelular de lípidos II.
  • La actividad de MurJ fue inhibida por compuestos que disipan el potencial de la membrana.
  • La inhibición bajo la disipación del potencial de membrana llevó a MurJ a adoptar una conformación inactiva y orientada hacia el exterior.

Conclusiones:

  • El potencial de membrana es esencial para la función de MurJ en E. coli.
  • El ensayo desarrollado permite la cuantificación de los inhibidores MurJ.
  • La conformación inactiva y orientada hacia el exterior de MurJ proporciona un objetivo estructural para el diseño de nuevos antibióticos.