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La O-metilación de la hidroxiquinona en la biosíntesis de la mitomicina

Sabine Grüschow¹, Leng-Chee Chang, Yingqing Mao

¹Life Sciences Institute, Department of Medicinal Chemistry, University of Michigan, Ann Arbor, MI 48109, USA.

Journal of the American Chemical Society

|April 28, 2007

Resumen

Este resumen es generado por máquina.

La MmcR metiltransferasa es crucial para producir las mitomicinas A y B mediante la adición de un grupo metoxí. Este paso de metilación es esencial para la biosíntesis de la mitomicina C, un fármaco clave en la quimioterapia.

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Área de la Ciencia:

La bioquímica es la bioquímica.
Biología Molecular Biología Molecular
Biosíntesis de Productos Naturales de Productos Naturales

Sus antecedentes:

Las mitomicinas son agentes alquiladores de ADN activados biorreductivamente utilizados en la terapia del cáncer.
La citotoxicidad de las mitomicinas depende de su potencial electroquímico, influenciado por los sustitutos de quinona.
El grupo metoxico de quinona en las mitomicinas A y B es crítico para su actividad.

Objetivo del estudio:

Investigar la biogénesis del grupo metoxico de quinona en las mitomicinas A y B.
Determinar el papel del gen de la metiltransferasa mmcR en la producción de mitomicina.
Aclarar la necesidad de 7-O-metilación para la biosíntesis de mitomicina C.

Principales métodos:

Estudios de eliminación de genes: cepa de Streptomyces lavendulae modificada por ingeniería con mmcR eliminado.
Análisis de metabolitos: extractos de cultivos analizados de cepas de tipo silvestre y mutantes.
Ensayos enzimáticos: clonación y sobreexpresión de MmcR metiltransferasa para estudios de metilación in vitro.

Principales resultados:

La eliminación de mmcR abolió la producción de mitomicinas A, B y C.
Se observó acumulación de 7-demetilmitomicina A y B en la cepa mutante.
MmcR catalizó la 7-O-metilación de las 7-hidroximitomicinas in vitro, restaurando la producción de mitomicina cuando se suministraron los precursores.

Conclusiones:

La MmcR metiltransferasa juega un papel catalítico directo en la formación del grupo 7-metoxi de las mitomicinas A y B.
La 7-O-metilación es un requisito previo para la biosíntesis del agente clínico mitomicina C.
Comprender la biosíntesis de la mitomicina proporciona información sobre el desarrollo de nuevos agentes alquilantes del ADN.