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CRACM1 es una proteína de membrana plasmática esencial para la entrada de Ca2+ en almacenes
1Department of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA. mvig@bidmc.harvard.edu
Science (New York, N.Y.)
|April 29, 2006
Resumen
Los investigadores examinaron las proteínas que inhiben la afluencia de calcio operado en el almacén. Identificaron CRACM1 y CRACM2 como moduladores clave de los canales de calcio activado por liberación de calcio (CRAC), lo que podría revelar nuevos componentes de este proceso celular esencial.
Área de la Ciencia:
- Biología celular Biología celular.
- Fisiología del canal iónico Fisiología del canal iónico
- Genética molecular La genética molecular.
Sus antecedentes:
- La entrada de calcio operado por almacenamiento es un proceso crítico para la señalización celular, mediada por canales de calcio activado por liberación de calcio (CRAC).
- Los canales CRAC se activan después del agotamiento de las reservas intracelulares de calcio, regulando varias funciones celulares.
Objetivo del estudio:
- Para identificar nuevas proteínas que regulan la afluencia de calcio operado en el almacén utilizando una pantalla de interferencia de ARN de todo el genoma.
- Caracterizar el papel de los moduladores identificados, específicamente CRACM1 y CRACM2, en la función de los canales CRAC.
Principales métodos:
- Interferencia de ARN de todo el genoma (RNAi) en las células de Drosophila para identificar proteínas inhibidoras de la afluencia de calcio operado en el almacén.
- Electrofisiología de la pinza de parche para examinar los moduladores de las corrientes CRAC de Drosophila.
- Caracterización del ortólogo humano de CRACM1, incluida su localización y efecto en las corrientes CRAC.
Principales resultados:
- Una pantalla de RNAi de todo el genoma identificó proteínas que inhiben la afluencia de calcio operado en el almacén.
- CRACM1 y CRACM2 fueron identificados como moduladores de las corrientes CRAC de Drosophila.
- La eliminación de CRACM1 interrumpió la activación de la corriente CRAC, lo que sugiere su participación en la función del canal CRAC.
Conclusiones:
- CRACM1 es una proteína residente en la membrana plasmática involucrada en la regulación de la actividad del canal CRAC.
- CRACM1 puede representar el propio canal CRAC, una subunidad o un componente de la maquinaria de señalización asociada.
- Estos hallazgos proporcionan nuevos conocimientos sobre los componentes moleculares y la regulación de la entrada de calcio operado en almacenes.
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