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Interacciones específicas entre las proteínas implicadas en la selección del sitio de empalme y el empalme

J Y Wu¹, T Maniatis

¹Department of Biochemistry and Molecular Biology, Harvard University, Cambridge, Massachusetts 02138.

|December 17, 1993

Resumen

Este estudio revela que los factores de empalme SC35 y SF2/ASF cruzan los sitios de empalme 5' y 3' interactuando con U1 snRNP y U2AF35. Estas interacciones son cruciales para el empalme pre-ARNm y pueden regular el empalme alternativo a través de las proteínas transformadoras de Drosophila.

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Área de la Ciencia:

Biología Molecular Biología Molecular
Genética La genética.
La bioquímica es la bioquímica.

Sus antecedentes:

El splicing pre-mRNA requiere un reconocimiento y emparejamiento precisos de los sitios de empalme 5' y 3'.
Los factores de empalme juegan un papel crítico en este intrincado proceso molecular.
La U1 pequeña ribonucleoproteína nuclear (snRNP) se une al sitio de empalme de 5' y U2AF35-U2AF65 se une al sitio de empalme de 3'.

Objetivo del estudio:

Investigar la interacción de los factores de empalme SC35 y SF2/ASF con los componentes del espliceosoma.
Para aclarar el papel de estas interacciones en la selección del sitio de empalme y la regulación de empalme alternativo.

Principales métodos:

Se utilizaron ensayos de interacción proteína-proteína para determinar las parejas de unión.
El estudio se centró en las interacciones entre SC35, SF2/ASF, U1 snRNP (U1-70K) y U2AF35.

Principales resultados:

Se encontró que SC35 y SF2/ASF interactúan específicamente tanto con U1-70K como con U2AF35.
Estas interacciones sugieren una función de puente para las proteínas SR entre los sitios de empalme 5' y 3'.
También se observaron interacciones entre SC35, SF2/ASF, U2AF35, y los reguladores de empalme de Drosophila Transformer (Tra) y Transformer-2 (Tra2).

Conclusiones:

SC35 y SF2/ASF actúan como puentes, conectando la maquinaria de reconocimiento del sitio de empalme de 5' y 3'.
Las interacciones proteína-proteína mediadas por las proteínas SR son importantes para la selección del sitio de empalme.
Es probable que estas interacciones jueguen un papel importante en la regulación del empalme alternativo, como lo demuestran las interacciones con Tra y Tra2.