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Estructura cristalina de un dominio de homología Src 3 (SH3)
A Musacchio1, M Noble, R Pauptit
1European Molecular Biology Laboratory, Heidelberg, Germany.
Nature
|October 29, 1992
Resumen
La estructura tridimensional del dominio SH3 del espectro revela una superficie conservada rica en aminoácidos específicos. Esta visión estructural sugiere un sitio de unión potencial para los ligandos de proteínas, avanzando nuestra comprensión de la función del dominio SH3.
Área de la Ciencia:
- Biología estructural Biología estructural.
- Biología molecular La biología molecular.
- La bioquímica es la bioquímica.
Sus antecedentes:
- El dominio Src-homólogo SH3 es crucial para la transducción de señales y las interacciones citoesqueléticas.
- Su función precisa sigue siendo en gran medida desconocida a pesar de su prevalencia en muchas proteínas.
Objetivo del estudio:
- Determinar la estructura tridimensional del dominio SH3 a partir del espectro de proteínas del citoesqueleto.
- Para aclarar la base estructural de las posibles interacciones proteína-ligando.
Principales métodos:
- Se utilizó la cristalografía de rayos X para determinar la estructura a una resolución de 1,8 Å.
- El dominio SH3 fue expresado en Escherichia coli.
Principales resultados:
- El dominio SH3 adopta una estructura compacta de barril beta compuesta por cinco hebras beta antiparalelas.
- Los aminoácidos conservados se agrupan en una superficie específica, caracterizada por residuos aromáticos y carboxílicos.
- Esta superficie conservada se encuentra alejada de los extremos N y C y del sitio de inserción del espectro.
Conclusiones:
- La superficie conservada identificada es un sitio probable para la unión del ligando de la proteína.
- Esta caracterización estructural proporciona una base para la comprensión de las interacciones mediadas por el dominio SH3.
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