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El factor de ribosilación ADP, una pequeña proteína reguladora dependiente de GTP, estimula la actividad de la

H A Brown¹, S Gutowski, C R Moomaw

¹Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas 75235-9041.

|December 17, 1993

Resumen

La actividad de la fosfolipasa D (PLD) se ve reforzada por un factor citosólico, identificado como factor de ribociliación ADP (ARF). Esta proteína ARF es esencial para el PLD.

Área de la Ciencia:

La bioquímica es la bioquímica.
Biología celular Biología celular.
Biología Molecular Biología Molecular

Sus antecedentes:

La fosfolipasa D (PLD) hidroliza la fosfatidilcolina, produciendo ácido fosfatídico y colina.
La actividad de PLD está regulada por varios factores celulares, incluidos los componentes citosólicos.
Los factores de ribociliación ADP (ARF) son reguladores conocidos del tráfico de vesículas intracelulares.

Objetivo del estudio:

Desarrollar un ensayo para medir la actividad de PLD en preparaciones celulares.
Para identificar y caracterizar el factor citosólico que mejora la actividad de PLD.
Para investigar el papel de las proteínas ARF en la regulación de PLD.

Principales métodos:

Desarrollo de un ensayo basado en sustrato exógeno para la actividad de PLD.
Purificación del factor citosólico del citosol del cerebro bovino.
Caracterización del factor purificado utilizando técnicas bioquímicas y moleculares.
Expresión y prueba del ARF1.1, miristoilado recombinante.

Principales resultados:

Se identificó un factor citosólico que mejora significativamente la actividad de PLD en las membranas.
Este factor fue purificado e identificado como miembro de la subfamilia del factor de ribociliación ADP-ARF.
El ARF1 miristoilado recombinante demostró una mayor activación de PLD en comparación con la forma no miristoilada.
Las proteínas ARF son cruciales para la estimulación dependiente de GTPγS de la PLD.

Conclusiones:

Las proteínas ARF juegan un papel destacado en la regulación de la actividad de la fosfolipasa D.
ARF puede actuar como un componente clave en la generación de segundos mensajeros a través de PLD.
Este hallazgo vincula el tráfico de vesículas mediado por ARF con las vías de transducción de señales que involucran a PLD.

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