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Estructura de una proteína 14-3-3 e implicaciones para la coordinación de múltiples vías de señalización

B Xiao¹, S J Smerdon, D H Jones

¹Division of Protein Structure, National Institute for Medical Research, Mill Hill, London, UK.

|July 13, 1995

Resumen

Los investigadores determinaron la estructura cristalina de la célula T humana 14-3-3 dimer de tau. Esta estructura revela un canal único crucial para las interacciones de las proteínas, incluyendo la unión a la proteína kinasa C.

Área de la Ciencia:

Biología estructural Biología estructural.
Biología molecular La biología molecular.
La bioquímica es la bioquímica.

Sus antecedentes:

Las proteínas 14-3-3 son ubicuas e involucradas en diversas funciones celulares.
Estas proteínas juegan un papel crítico en la transducción de señales, la exocitosis y la regulación del ciclo celular.

Objetivo del estudio:

Para determinar la estructura cristalina de las células T humanas 14-3-3 tau isoforma dimer.
Para aclarar la base estructural de la función e interacciones de la proteína 14-3-3.

Principales métodos:

Se utilizó la cristalografía de rayos X para obtener la estructura.
La estructura se determinó con una resolución de 2,6 Å.

Principales resultados:

Se resolvió la estructura dimérica tau 14-3-3 de la célula T humana.
Cada monómero está formado por nueve hélices alfa antiparalelas que forman dos dominios estructurales.
Un canal grande y cargado negativamente es formado por el dímero, con residuos invariantes que recubren su interior.

Conclusiones:

La estructura determinada proporciona información sobre los mecanismos moleculares de las proteínas 14-3-3.
La estructura del canal está implicada en la unión de 14-3-3 a la proteína kinasa C.
Esta información estructural es vital para comprender las vías de transducción de señales que involucran a las proteínas 14-3-3.

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