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El tetratiomolibdato inhibe las proteínas de tráfico de cobre a través de la formación de racimos metálicos
Hamsell M Alvarez1, Yi Xue, Chandler D Robinson
1The Chemistry of Life Processes Institute, Northwestern University, Evanston, IL 60208, USA.
Science (New York, N.Y.)
|December 8, 2009
Resumen
Tetratiomolybdate (TM) inhibe el metabolismo del cobre mediante la formación de grupos estables con metallochaperones. Este mecanismo regula a la baja el suministro de cobre, lo que sugiere proteínas reguladoras de metales como posibles blancos de fármacos.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Química de las metaloproteínas
- Descubrimiento de Drogas Descubrimiento de Drogas
Sus antecedentes:
- Los trastornos del metabolismo del cobre requieren tratamientos efectivos.
- Tetratiomolybdate (TM) es un agente activo por vía oral para el tratamiento de trastornos del metabolismo del cobre.
- Comprender el mecanismo de la MT es crucial para desarrollar terapias dirigidas.
Objetivo del estudio:
- Para dilucidar el mecanismo molecular por el cual el tetratiomolybdate (TM) inhibe las proteínas que regulan la fisiología del cobre.
- Para investigar la base estructural para la estabilidad del complejo TM-metallochaperona.
- Para explorar las implicaciones de la acción de TM para apuntar a las proteínas reguladoras de metales.
Principales métodos:
- Cristalografía de rayos X para determinar la estructura del complejo TM-Atx1.
- Estudios espectroscópicos para analizar la estabilidad y la naturaleza de los grupos de cobre-molibdeno.
- Ensayos mecanicistas para evaluar el impacto de la MT en las funciones de las proteínas traficantes de cobre.
Principales resultados:
- La cristalografía reveló un grupo estable de cobre-molibdeno con puente de azufre en el complejo TM-Atx1.
- Los datos espectroscópicos confirmaron la estabilidad de este racimo en solución, reflejando los racimos fisiológicos.
- Los estudios mecánicos demostraron la inhibición de TM de la transferencia de metales entre las proteínas de tráfico de cobre.
Conclusiones:
- TM regula directa y reversiblemente a la baja la entrega de cobre a las metalloenzimas.
- La formación de un grupo único de cobre-molibdeno es clave para la acción inhibidora de la MT.
- Las proteínas involucradas en la regulación de los metales representan objetivos prometedores para la intervención terapéutica.
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