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Estructura de solución tridimensional de la homología src 2 dominio de c-abl
M Overduin1, C B Rios, B J Mayer
1Laboratories of The Rockefeller University New York, New York 10021.
Cell
|August 21, 1992
Resumen
El estudio determinó la estructura 3D del dominio abl SH2, revelando su forma esférica compacta y los residuos clave involucrados en la unión a la fosfotirosina. Este hallazgo ayuda a entender cómo los dominios SH2 reconocen las proteínas diana.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Estructural Biología estructural.
- La biofísica molecular es la biofísica molecular.
Sus antecedentes:
- Los dominios SH2 son motivos proteicos críticos que se unen a los residuos de fosfotirosina en las proteínas objetivo.
- Comprender la base estructural de esta interacción es esencial para descifrar las vías de señalización celular.
Objetivo del estudio:
- Para determinar la estructura de la solución del dominio abl SH2.
- Para dilucidar las características estructurales responsables de la unión de la fosfotirosina.
Principales métodos:
- Se empleó la espectroscopia de resonancia magnética nuclear (RMN) multidimensional.
- Se determinó la estructura de una proteína de 109 residuos y 12,1 kDa.
Principales resultados:
- El dominio abl SH2 adopta una estructura esférica compacta.
- Cuenta con hojas beta antiparalelas y una hélice alfa C-terminal que rodea un núcleo hidrofóbico.
- Residuos específicos de arginina se colocan dentro del sitio de unión de la fosfotirosina.
Conclusiones:
- La estructura determinada proporciona información sobre el mecanismo de reconocimiento molecular de los dominios SH2.
- La conservación estructural entre los miembros de la familia SH2 sugiere un modo de unión común para la fosfotirosina.
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