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Bases estructurales y funcionales de la entrada del SARS-CoV-2 mediante el uso de ACE2 humano

Qihui Wang1, Yanfang Zhang2, Lili Wu3

  • 1CAS Key Laboratory of Microbial Physiological and Metabolic Engineering, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China; Shenzhen Key Laboratory of Pathogen and Immunity, Shenzhen Third People's Hospital, Shenzhen 518112, China; CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China.

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La proteína del pico del SARS-CoV-2 se une al ACE2 humano con una mayor afinidad debido a cambios clave en los residuos. Los anticuerpos efectivos contra el SARS-CoV no se unen al SARS-CoV-2, lo que pone de relieve las diferencias virales.

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Acero en suspensiónEl CTDEn el caso del SARS-CoV-2estructura de cristalinmunogenicidadel receptordominio de unión al receptor

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Área de la Ciencia:

  • Virología
  • Biología estructural
  • Inmunología

Sus antecedentes:

  • El nuevo coronavirus (SARS-CoV-2) surgió, causando preocupaciones globales de salud.
  • La enzima convertidora de angiotensina 2 (ACE2) se identifica como el receptor de entrada para el SARS-CoV-2.
  • Comprender la interacción entre SARS-CoV-2 y ACE2 es crucial para el desarrollo terapéutico.

Objetivo del estudio:

  • Para determinar la estructura cristalina del dominio C-terminal del SARS-CoV-2 (CTD) de la proteína del pico unida al ACE2 humano (hACE2).
  • Para aclarar la base molecular de la unión del SARS-CoV-2 al hACE2 y compararlo con el SARS-CoV.
  • Para investigar las diferencias antigénicas entre las proteínas de punta del SARS-CoV y el SARS-CoV-2.

Principales métodos:

  • Se utilizó la cristalografía de rayos X para obtener la estructura del complejo SARS-CoV-2 CTD-hACE2.
  • El análisis estructural se centró en la interfaz de unión para identificar las interacciones clave y las diferencias de residuos.
  • Los ensayos de unión de anticuerpos se realizaron utilizando anticuerpos monoclonales y policlonales contra la proteína del pico del SARS-CoV.

Principales resultados:

  • La estructura cristalina reveló un modo de unión hACE2 similar al SARS-CoV pero con sustituciones de residuos clave en el SARS-CoV-2-CTD.
  • Estas sustituciones dan como resultado una interacción ligeramente más fuerte y una mayor afinidad de unión del SARS-CoV-2 con hACE2 en comparación con el SARS-CoV.
  • Los anticuerpos murinos contra el dominio de unión de la proteína del pico del SARS-CoV/receptor (RBD) no interactuaron con la proteína del pico del SARS-CoV-2, lo que indica una antigenicidad distinta.

Conclusiones:

  • Los datos estructurales y de unión proporcionan información sobre la unión mejorada al receptor del SARS-CoV-2.
  • Las diferencias en la antigeneidad sugieren que los anticuerpos existentes contra el SARS-CoV pueden no ser efectivos contra el SARS-CoV-2.
  • Estos hallazgos son vitales para comprender la patogénesis viral y desarrollar estrategias terapéuticas específicas contra el SARS-CoV-2.