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Macrociclado de la cadena lateral de RiPPs por hongos catalizado por la enzima dependiente del cobre DUF3328
Journal of the American Chemical Society
|March 3, 2025
Resumen
La enzima fúngica AprY cataliza dos reacciones de enlace cruzado C-O para la maduración oxidativa del RiPP asperipina-2a. Este proceso requiere cobre y oxígeno pero no una secuencia de péptido líder.
Área de la Ciencia:
- La bioquímica
- Biología molecular
- Enzimología
Sus antecedentes:
- Las enzimas fúngicas con dominio de función desconocida (DUF) 3328 están involucradas en la maduración oxidativa de péptidos sintetizados por ribosoma y modificados post-traducionalmente (RiPP).
- La comprensión de estas enzimas es crucial para elucidar nuevas vías biosintéticas.
Objetivo del estudio:
- Para caracterizar funcionalmente la enzima fúngica AprY, una proteína que contiene el dominio DUF 3328.
- Investigar el papel de AprY en la biosíntesis de la RiPP asperipina-2a.
Principales métodos:
- Reconstitución bioquímica de la enzima AprY.
- Ensayos in vitro para determinar la actividad enzimática y los requisitos.
Principales resultados:
- Se demostró que AprY catalizaba dos reacciones consecutivas de enlace cruzado C-O.
- Estas reacciones ocurren entre las tirosinas y los beta-carbonos dentro del hexapéptido central de la asperipina-2a.
- La actividad de macrociclado de la enzima depende del cobre y el oxígeno, pero es independiente de una secuencia de péptidos líder.
Conclusiones:
- AprY es una enzima clave en la biosíntesis de la asperipina-2a, mediando las reacciones esenciales de enlace cruzado C-O.
- Los hallazgos revelan nuevos conocimientos sobre los mecanismos de maduración oxidativa de los RiPP.
- AprY representa un objetivo potencial para aplicaciones de biología sintética que involucran la modificación de RiPP.
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