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Estructuras del trímero del pico Omicron con ACE2 y un anticuerpo anti-Omicron
Wanchao Yin1, Youwei Xu1, Peiyu Xu1
1The CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China.
Science (New York, N.Y.)
|February 8, 2022
Resumen
La variante Omicron
Área de la Ciencia:
- Virología
- Biología estructural
- Inmunología
Sus antecedentes:
- La variante Omicron del SARS-CoV-2 es la cepa mundial dominante.
- Comprender las propiedades estructurales de Omicron es crucial para el desarrollo terapéutico.
Objetivo del estudio:
- Para aclarar la base estructural de la infectividad de Omicron y la evasión inmune.
- Evaluar la eficacia de los anticuerpos terapéuticos contra el Omicron.
Principales métodos:
- Se utilizó la cristalografía de rayos X para determinar las estructuras del trímero de picos Omicron.
- Se analizaron estructuras complejas con ACE2 y un anticuerpo (JMB2002).
- Se realizaron ensayos de estabilidad termodinámica.
Principales resultados:
- Las mutaciones de Omicron alteran los sitios de unión de anticuerpos pero mejoran la unión al receptor ACE2.
- La proteína del pico Omicron muestra inestabilidad termodinámica.
- Una inusual interacción RBD-RBD estabiliza la conformación unida a ACE2.
- El anticuerpo terapéutico JMB2002 mantiene la actividad neutralizante contra Omicron.
Conclusiones:
- Las mutaciones de Omicron confieren una mayor unión a ACE2 y escape inmune.
- La inestabilidad estructural del pico Omicron puede influir en su biología.
- JMB2002 representa una estrategia terapéutica prometedora contra las infecciones por Omicron.
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