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Estructura cryo-EM del virus del chikungunya en complejo con el receptor Mxra8
Katherine Basore1, Arthur S Kim2, Christopher A Nelson1
1Department of Pathology & Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA.
Cell
|May 14, 2019
Resumen
Mxra8 es un receptor para los alfavirus como el virus de la chikungunya (CHIKV). Este estudio revela Mxra8
Área de la Ciencia:
- Biología estructural
- Virología
- Inmunología
Sus antecedentes:
- Mxra8 actúa como receptor de los alfavirus artrogénicos, responsables de las enfermedades musculoesqueléticas graves en los seres humanos.
- Comprender la interacción entre Mxra8 y virus como el virus de la chikungunya (CHIKV) es crucial para desarrollar estrategias terapéuticas.
Objetivo del estudio:
- Para aclarar la base estructural de la interacción de Mxra8 con el CHIKV.
- Proporcionar información sobre el mecanismo de entrada del alfavirus mediado por Mxra8.
Principales métodos:
- Se empleó la cristalografía de rayos X para determinar la estructura de alta resolución de Mxra8.
- Se utilizó la crio-microscopía electrónica (cryo-EM) para visualizar Mxra8 unido a partículas similares al virus CHIKV (VLPs) y al CHIKV infeccioso.
Principales resultados:
- La estructura cristalina de Mxra8 reveló una disposición única de sus dominios Ig.
- Mxra8 se une al CHIKV mediante la interacción con los heterodímeros E2-E1 dentro de los picos virales, utilizando modos de unión distintos.
- La maduración viral y la ocupación de E3 influyen en la afinidad de unión de Mxra8 y la selección del sitio en el CHIKV infeccioso.
Conclusiones:
- El estudio proporciona información estructural detallada sobre cómo Mxra8 se une al CHIKV.
- Los hallazgos allanan el camino para diseñar nuevos inhibidores dirigidos a la entrada del alfavirus.
Palabras clave:
Espectrometría de masas HDXel virus alfaMicroscopía criolectrónicaInfecciónCristalografía de proteínasResonancia plasmónica de superficieel receptor del virusMás Videos Relacionados
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