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La estructura de resonancia magnética nuclear de un dominio SH2 de la fosfolipasa C-gamma 1 compleja con un péptido

S M Pascal¹, A U Singer, G Gish

¹Biochemistry Research Division, Hospital for Sick Children, Toronto, Ontario, Canada.

|May 6, 1994

Resumen

La estructura de la fosfolipasa C-gamma 1 es la siguiente:

Área de la Ciencia:

Biología Molecular Biología Molecular
Biología Estructural Biología estructural.
La bioquímica es la bioquímica.

Sus antecedentes:

El dominio SH2 es crucial para la transducción de señales.
La fosfolipasa C-gamma 1 (PLC-gamma 1) juega un papel en las vías de señalización celular.
Comprender las interacciones del dominio SH2 es clave para descifrar los mecanismos de señalización.

Objetivo del estudio:

Determinar la estructura de la solución del dominio C-terminal SH2 del PLC-gamma 1.
Para investigar su complejo con un fosfopéptido específico del receptor del factor de crecimiento derivado de plaquetas (PDGFR).
Para aclarar la base estructural de las interacciones SH2-fosfopéptido.

Principales métodos:

Se empleó la espectroscopia de resonancia magnética nuclear (RMN).
El estudio se centró en el complejo entre el dominio PLC-gamma 1 SH2 y un fosfopéptido que contiene Tyr-1021.

Principales resultados:

La topología general del complejo PLC-gamma 1 SH2-fosfopéptido se asemeja a la de los complejos Src y Lck SH2.
Se observó una diferencia clave en el sitio de unión de los residuos C-terminales a la fosfotirosina (pTyr).
Este sitio forma una ranura extendida que acomoda los residuos de péptidos +1 a +6 en relación con pTyr.

Conclusiones:

El dominio PLC-gamma 1 SH2 exhibe un modo de unión distinto en comparación con Src y Lck.
Esta interacción involucra residuos hidrofóbicos C-terminales hasta el pTyr.
El dominio PLC-gamma 1 SH2 sirve como prototipo para una segunda clase de interacciones SH2-fosfopéptido.

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