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Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies
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La estructura cristalina de la isoforma zeta de la proteína 14-3-3 se encuentra en su estructura cristalina
D Liu1, J Bienkowska, C Petosa
1Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA.
Nature
|July 13, 1995
Resumen
La familia de proteínas 14-3-3 regula la señalización intracelular. Los investigadores determinaron la estructura cristalina de una importante proteína 14-3-3, revelando una ranura de unión conservada para diversas interacciones celulares.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología Estructural Biología estructural.
- La bioquímica es la bioquímica.
Sus antecedentes:
- Las proteínas 14-3-3 son reguladores clave de las vías de señalización intracelular.
- Interactúan con los productos oncogénicos y proto-oncogénicos, influyendo en los procesos celulares.
- Estudios previos indicaron su papel en la activación de las quinasas e inducir la maduración celular.
Objetivo del estudio:
- Para determinar la estructura cristalina de la principal isoforma de la proteína 14-3-3 de los mamíferos.
- Para dilucidar la base estructural de las interacciones de la proteína 14-3-3 con otras moléculas celulares.
Principales métodos:
- Se utilizó la cristalografía de rayos X para determinar la estructura de la proteína.
- La resolución alcanzada fue de 2,9 Angstroms.
Principales resultados:
- La estructura cristalina reveló una proteína dimérica compuesta por nueve hélices antiparalelas por subunidad.
- Se identificó una ranura anfipática central capaz de unir una hélice adicional.
- Se observaron residuos conservados en la interfaz del dímero y la superficie de unión de ligandos en todas las especies.
Conclusiones:
- El surco identificado sugiere un mecanismo general para la interacción de la proteína 14-3-3 con diversos socios celulares.
- Se indica la conservación estructural y funcional de las proteínas 14-3-3 en vertebrados, levaduras y plantas.
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