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Un inactivador basado en el mecanismo para la histona demetilasa LSD11
Jeffrey C Culhane1, Lawrence M Szewczuk, Xin Liu
1Department of Pharmacology and Molecular Sciences, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
Journal of the American Chemical Society
|April 6, 2006
Resumen
Los investigadores desarrollaron un inhibidor selectivo, el compuesto 1, dirigido a la histona desmetilasa LSD1 (desmetilasa específica de lisina 1). Este inactivador basado en el mecanismo se une covalentemente al FAD, ofreciendo una nueva herramienta para estudiar las modificaciones histónicas y la remodelación de la cromatina.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
- La epigenética es la epigenética.
Sus antecedentes:
- La histona demetilasa LSD1 (desmetilasa específica de lisina 1) es una enzima clave en la regulación epigenética.
- LSD1 cataliza la eliminación de los grupos metilo de la histona H3 lisina 4 (H3K4), influyendo en la expresión génica.
- La desregulación de la actividad de LSD1 está implicada en varias enfermedades, incluido el cáncer.
Objetivo del estudio:
- Diseñar y sintetizar nuevos inhibidores basados en péptidos dirigidos a LSD1.1.
- Caracterizar el mecanismo de inhibición y selectividad de los compuestos desarrollados.
- Establecer una herramienta química para investigar la función de LSD1 en la modificación de histonas y remodelación de la cromatina.
Principales métodos:
- Diseño y síntesis de análogos de inhibidores basados en péptidos.
- Pruebas de inhibición enzimática para evaluar la actividad de LSD1.
- Estudios de inactivación dependientes del tiempo para determinar el mecanismo de acción.
- Espectrometría de masas para identificar adyuctos covalentes.
- Perfiles de selectividad frente a enzimas relacionadas como la monoamina oxidasa B.
Principales resultados:
- Se sintetizaron dos análogos de inhibidores basados en péptidos, con el compuesto 1 que muestra una potente inactivación dependiente del tiempo de LSD1.1.
- El compuesto 1 contiene un grupo de propargylamine y forma un adducto covalente con el cofactor FAD de LSD1.1.
- La inhibición por el compuesto 1 fue protegida por el sustrato peptídico de una manera dependiente de la concentración.
- El compuesto 1 demostró una alta selectividad, sin que se observara una inhibición significativa de la monoamina oxidasa B.
- La espectrometría de masas confirmó la interacción covalente entre el compuesto 1 y FAD.
Conclusiones:
- El Compuesto 1 es un inactivador selectivo y basado en el mecanismo de la histona desmetilasa LSD1.1.
- La funcionalidad de la propargylamina y la formación de un adducto FAD covalente son claves para su actividad inhibidora.
- El Compuesto 1 sirve como una sonda química valiosa para estudiar los roles biológicos de LSD1 en la modificación de histonas y la remodelación de la cromatina.
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