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Analyses of Mitochondrial Calcium Influx in Isolated Mitochondria and Cultured Cells
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EMRE es un componente esencial del complejo uniporter de calcio mitocondrial
Yasemin Sancak1, Andrew L Markhard, Toshimori Kitami
1Department of Molecular Biology, Massachusetts General Hospital, Department of Systems Biology, Harvard Medical School, Boston, MA, USA.
Science (New York, N.Y.)
|November 16, 2013
Resumen
La proteína reguladora esencial del MCU (EMRE) es crucial para la absorción de calcio mitocondrial. EMRE une la detección de calcio por MICU1 / MICU2 con la conducción de calcio por MCU, lo que permite la actividad del canal uniporter.
Área de la Ciencia:
- Biología mitocondrial Biología mitocondrial
- Fisiología molecular y celular.
- La bioquímica es la bioquímica.
Sus antecedentes:
- El complejo uniporter de calcio mitocondrial (MCU, por sus siglas en inglés) regula la homeostasis del calcio.
- Los componentes clave incluyen MCU, MICU1 y MICU2, pero la composición completa del holocomplejo no estaba clara.
Objetivo del estudio:
- Para caracterizar completamente la composición molecular del holocomplejo uniporter mitocondrial (uniplex).
- Para dilucidar la función de proteínas previamente no caracterizadas dentro del uniplex.
Principales métodos:
- Purificación por afinidad del complejo uniplex.
- Espectrometría de masas cuantitativa para identificar los componentes de las proteínas.
- Evaluación de la actividad del canal uniporter en presencia y ausencia de proteínas identificadas.
Principales resultados:
- Identificó MICU1, MICU2, MCU, MCUb, y una nueva proteína, el regulador esencial de MCU (EMRE).
- EMRE es una pequeña proteína transmembrana esencial para la actividad uniporter.
- Se requiere EMRE para la interacción entre MCU y las proteínas sensibles al calcio MICU1/MICU2.
Conclusiones:
- EMRE es un componente crítico del complejo uniporter de calcio mitocondrial.
- EMRE actúa como un puente molecular, vinculando la detección de calcio a la conducción de calcio.
- EMRE es esencial para la absorción de calcio mitocondrial in vivo.
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