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Bases estructurales del reconocimiento de Wnt por Frizzled
Claudia Y Janda1, Deepa Waghray, Aron M Levin
1Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, CA 94305, USA.
Science (New York, N.Y.)
|June 2, 2012
Resumen
La estructura de Xenopus Wnt8 unido a Frizzled-8 revela una forma única de "mano" de dos dominios. Esta interacción, que involucra a un grupo lipídico y aminoácidos específicos, explica la complejidad de la señalización Wnt y ayuda al desarrollo de fármacos.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología del desarrollo Biología del desarrollo.
- Biología Estructural Biología estructural.
Sus antecedentes:
- Las proteínas Wnt son morfógenos modificados por lípidos cruciales que dirigen el desarrollo a través de las interacciones de los receptores Frizzled.
- Comprender la estructura compleja de Wnt-Frizzled es clave para descifrar las vías de señalización del desarrollo.
Objetivo del estudio:
- Para aclarar la base estructural de la interacción de Xenopus Wnt8 (XWnt8) con el ratón Frizzled-8 dominio rico en cisteína (Fz8-CRD).
- Investigar el papel de la modificación lipídica y los residuos conservados en la unión y la reactividad cruzada de Wnt-Frizzled.
Principales métodos:
- Se utilizó cristalografía de rayos X para determinar la estructura de 3,25 angstroms del complejo XWnt8-Fz8-CRD.
- Se realizó un análisis de las interfaces proteína-ligando, incluidas las interacciones de lípidos y aminoácidos.
Principales resultados:
- El estudio reveló una inusual estructura Wnt de dos dominios, que se asemeja a una "mano" con distintos sitios de unión para Fz8-CRD.
- Un grupo lipídico de ácido palmitoleico en la punta del pulgar Wnt se une a una ranura profunda en el Fz8-CRD.
- Se identificaron contactos hidrofóbicos entre el dedo índice Wnt y el Fz8-CRD, que involucran aminoácidos conservados.
Conclusiones:
- Las interfaces conservadas y la interacción lipídica explican la reactividad cruzada Wnt-Frizzled y la pleiotropía funcional.
- Estos hallazgos tienen implicaciones significativas para el desarrollo de terapias dirigidas basadas en Wnt para el cáncer y la medicina regenerativa.
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