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Transferencia gradual de O-átomos en triptófano dioxigenasa a base de hemo: papel del sustrato de amonio en la
Inchul Shin1, Brett R Ambler2, Daniel Wherritt1
1Department of Chemistry , University of Texas at San Antonio , San Antonio , Texas 78249 , United States.
Journal of the American Chemical Society
|March 7, 2018
Resumen
Los investigadores estudiaron el papel del sustrato
Área de la Ciencia:
- La bioquímica
- Enzimología
- Química orgánica
Sus antecedentes:
- Las triptófanos dioxigenasas basadas en hemo (TDO) son metaloproteínas con propiedades inmunosupresoras y relevancia biomédica.
- La comprensión del mecanismo catalítico de las DOT es crucial para el desarrollo de terapias dirigidas.
Objetivo del estudio:
- Aclarar el papel específico del grupo α-amino del sustrato en la transferencia de átomos de oxígeno durante la catálisis TDO humana.
- Investigar el impacto de la modificación del sustrato en las vías de reacción TDO.
Principales métodos:
- Síntesis de dos sondas mecanicistas con grupos α-amino modificados (sustitución de carbono u oxígeno).
- Ensayos bioquímicos para controlar la actividad catalítica y la formación de productos.
- Análisis espectroscópico extensivo (HPLC, UV-vis, HR-MS, RMN, IR) para la caracterización de los intermedios y productos de la reacción.
Principales resultados:
- Las modificaciones del sustrato alteraron significativamente el paso catalítico después de la primera transferencia de átomos de oxígeno.
- Se identificó un nuevo producto de furoindolina monooxigenada, originario de un intermediario de epoxiindol.
- La evidencia experimental confirmó la participación del grupo α-amino del sustrato en el paso de apertura del anillo epóxido.
Conclusiones:
- El estudio demuestra que los compuestos sintéticos pueden modular el mecanismo de transferencia gradual de átomos de oxígeno de TDO.
- Proporciona la primera evidencia sustancial para el papel catalítico del grupo α-amino del sustrato en las reacciones mediadas por TDO.
- Avanza en la comprensión mecanicista de las triptófanos dioxigenasas basadas en hemo.
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