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Las oxigenasas de hierro no hemo generan diversidad estructural natural en los antibióticos carbapenémicos
Micah J Bodner1, Ryan M Phelan, Michael F Freeman
1Department of Chemistry, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA.
Journal of the American Chemical Society
|December 19, 2009
Resumen
Se descubrió que dos enzimas, ThnG y ThnQ de Streptomyces cattleya, oxidan los antibióticos carbapenémicos. Esta investigación aclara la biosíntesis de estos medicamentos vitales, mejorando potencialmente el desarrollo de antibióticos.
Área de la Ciencia:
- Microbiología Microbiología.
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
Sus antecedentes:
- Los carbapenems son una clase crucial de antibióticos con más de 50 variantes naturales.
- Las variaciones en los carbapenems, principalmente en las cadenas laterales C-2/C-6, influyen en su eficacia.
- La oxidación en las posiciones C-2/C-6 está relacionada con una mayor actividad antibiótica.
Objetivo del estudio:
- Para identificar y caracterizar las enzimas responsables de la oxidación del carbapenem en Streptomyces cattleya.
- Aclarar las funciones específicas de ThnG y ThnQ en la biosíntesis de los antibióticos carbapenémicos.
Principales métodos:
- Ensayos enzimáticos utilizando ThnG y ThnQ. purificados.
- Análisis de los productos de reacción utilizando métodos espectroscópicos.
- Investigación del grupo de genes de la tienamicina en Streptomyces cattleya.ya.
Principales resultados:
- Se demostró que ThnQ hidroxila estereospecíficamente el PS-5 a la N-acetiltienamicina.
- ThnG catalizó la desaturación y la sulfoxidación de PS-5, produciendo PS-7 y su sulfóxido.
- Ambas enzimas exhibieron selectividad relativa al sustrato, lo que contribuyó a la diversidad oxidativa de los carbapenemas.
Conclusiones:
- ThnG y ThnQ son enzimas clave en la modificación oxidativa de los carbapenems en Streptomyces cattleya.
- Estos hallazgos proporcionan información sobre la biblioteca combinatoria natural de los carbapenems.
- La comprensión de estas enzimas guiará la investigación futura sobre la biosíntesis y el desarrollo de antibióticos carbapenémicos.
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