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Generación de variantes del tamaño del anillo de tiocilina por sustitución de genes prepeptídicos y procesamiento in
Albert A Bowers1, Michael G Acker, Travis S Young
1Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana 47907, USA.
Journal of the American Chemical Society
|June 13, 2012
Resumen
Bacillus cereus también produce tiocilinas, péptidos tiazolilo naturales. Los experimentos de competencia revelan que el paso clave de ciclización puede crear anillos nuevos y de diferentes tamaños, expandiendo la diversidad de productos naturales.
Área de la Ciencia:
- Biosíntesis de Productos Naturales de Productos Naturales
- El metabolismo secundario microbiano.
- Biología Química Biología química.
Sus antecedentes:
- Las tiocilinas son péptidos tiazolílicos producidos por el Bacillus cereus.
- La biosíntesis implica la modificación post-traduccional de un péptido precursor.
- Un paso clave es una cicloadición formal entre dos residuos de serina, formando un macrociclo.
Objetivo del estudio:
- Para investigar la promiscuidad del paso final de la macrociclado en la biosíntesis de la tiocilina.
- Explorar la generación de tamaños de anillos variantes a través de la ciclización alterada.
- Para ampliar la diversidad estructural conocida de los péptidos tiazolílicos naturales.
Principales métodos:
- Utilizó experimentos de competencia para sondear la reacción de ciclización.
- Productos analizados para identificar y caracterizar estructuras variantes de anillos.
- Empleó enfoques genéticos o bioquímicos para estudiar la biosíntesis de Bacillus cereus ATCC 14579.
Principales resultados:
- Se ha demostrado una promiscuidad significativa en la etapa de macrociclado.
- Generó e identificó con éxito varias variantes de tiocilina con tamaños de anillo alterados.
- Observaron tamaños de anillos no informados previamente en las tiocilinas naturales.
Conclusiones:
- El paso final de macrociclado en la biosíntesis de la tiocilina es altamente flexible.
- Esta flexibilidad permite la generación natural de diversas estructuras de péptidos tiazolílicos.
- Los hallazgos abren vías para descubrir nuevos productos naturales con arquitecturas de anillos únicos.
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