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El complejo de proteínas de la envoltura de la membrana precursora del flavivirus: estructura y maduración.

Long Li1, Shee-Mei Lok, I-Mei Yu

  • 1Department of Biological Sciences, Purdue University, West Lafayette, IN 47907, USA.

Science (New York, N.Y.)
|March 29, 2008
PubMed
Resumen

Los flavivirus maduran a través de la escisión de la proteína de la membrana precursora (prM), convirtiendo los virus inertes en partículas infecciosas. Este estudio revela la estructura heterodímera del virus del dengue prM-E, lo que explica la maduración y la inhibición de la fusión de las células huésped.

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Área de la Ciencia:

  • Virología Virología.
  • Biología Estructural Biología estructural.
  • Biología Molecular Biología Molecular

Sus antecedentes:

  • La maduración viral es crucial para la infectividad, ya que implica el procesamiento de proteínas.
  • La maduración del flavivirus se basa en la escisión proteolítica de la proteína de la membrana precursora (prM).

Objetivo del estudio:

  • Para determinar la estructura cristalina de alta resolución del virus del dengue prM-E heterodímero.
  • Para aclarar la base estructural de la maduración del flavivirus y la inhibición de la fusión de la célula huésped.

Principales métodos:

  • Cristalografía de rayos X con una resolución de 2,2 angstroms.
  • Expresión y purificación de proteínas recombinantes.
  • Ajuste de densidad de la microscopía criolectrónica.

Principales resultados:

  • Se determinó la estructura cristalina del heterodímero prM-E del virus del dengue.
  • El péptido pr protege el bucle de fusión de la glicoproteína E, evitando la fusión de la membrana.
  • La estructura es consistente con los datos cryo-EM de virus inmaduros a pH neutro.

Conclusiones:

  • La estructura prM-E proporciona una comprensión molecular de la maduración del flavivirus.
  • Revela el mecanismo por el cual el péptido pr inhibe la fusión.
  • Esta visión estructural ayuda a comprender los cambios conformacionales dependientes del pH durante la maduración viral.