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Un dominio de unión de AMP reutilizado revela la AMPilación de la proteína mitocondrial como un regulador del
Abner Gonzalez1, Alex Pon1, Kelly Servage2,3
1Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
Nature communications
|August 23, 2025
Resumen
Los investigadores desarrollaron un nuevo método para identificar la AMPilación de proteínas, una modificación crucial después de la traducción. Esta técnica reveló que la Selenoproteína O
Área de la Ciencia:
- La bioquímica
- Biología molecular
- Modificaciones posteriores a la traducción
Sus antecedentes:
- La proteína AMPilación, la adición de adenosina monofosfato (AMP) a las proteínas, es una modificación post-traduccional conocida.
- La investigación está limitada por la falta de herramientas para la identificación sistemática de sustratos AMPilados.
Objetivo del estudio:
- Desarrollar una técnica de enriquecimiento para aislar y estudiar las proteínas AMPiladas.
- Identificar nuevos sustratos de la selenoproteína O de la AMPilasa.
- Para aclarar el papel de la AMPilación en la regulación metabólica y la señalización celular.
Principales métodos:
- Desarrollo de una técnica de enriquecimiento utilizando la proteína de unión de nucleótidos hinT.
- Microscopía criolectrónica (Cryo-EM) para el análisis estructural de las proteínas AMPiladas unidas a hinT.
- Mutagénesis guiada por la estructura para optimizar el enriquecimiento e identificar sustratos.
Principales resultados:
- Se estableció una nueva técnica de enriquecimiento para la identificación de proteínas AMPiladas.
- Cryo-EM proporcionó información estructural sobre la selectividad de la PMA.
- Se identificó que la Selenoproteína O de mamíferos regula el flujo metabólico mediante la AMPilación de proteínas mitocondriales clave como la glutamato deshidrogenasa y la piruvato deshidrogenasa.
Conclusiones:
- La proteína AMPilación es una modificación post-traduccional emergente con funciones significativas en la transducción de señales y la enfermedad.
- La plataforma de enriquecimiento desarrollada permite el descubrimiento de nuevas proteínas AMPiladas.
- Se demostró la función de la selenenoproteína O en la regulación de las vías metabólicas a través de la AMPilación.
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