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Peptide-based Identification of Functional Motifs and their Binding Partners
Published on: June 30, 2013
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La cartografía de un paisaje biosintético estreptocócico inexplorado revela un motivo único de ciclización de
Leah B Bushin1, Kenzie A Clark1, István Pelczer1
1Department of Chemistry , Princeton University , Princeton , New Jersey 08544 , United States.
Journal of the American Chemical Society
|November 7, 2018
Resumen
Los investigadores descubrieron una nueva forma en que las bacterias crean péptidos complejos utilizando enzimas radicales de S-adenosilmetionina (RaS). Este hallazgo amplía nuestro conocimiento de las capacidades biosintéticas microbianas y potenciales nuevas terapias.
Área de la Ciencia:
- La bioquímica
- Microbiología
- Química bioorgánica
Sus antecedentes:
- Los productos naturales de péptidos cumplen funciones cruciales como señales y antibióticos.
- Las modificaciones estructurales inusuales en los péptidos ofrecen información sobre el potencial biosintético y terapéutico de la Naturaleza.
- Las bacterias estreptococos, que se encuentran en los microbiomas de los mamíferos, poseen capacidades biosintéticas poco exploradas.
Objetivo del estudio:
- Para investigar el potencial biosintético de los estreptococos.
- Identificar nuevos productos naturales y vías de biosíntesis en estreptococos.
- Para caracterizar las reacciones enzimáticas sin precedentes en la modificación de péptidos.
Principales métodos:
- Desarrolló una nueva estrategia de búsqueda bioinformática.
- La superfamilia de enzimas radicales S-adenosilmetionina (RaS) está vinculada al descubrimiento de productos naturales.
- Utilizó el control de quórum en la estrategia de búsqueda.
- Centrado en un locus biosintético específico para un análisis detallado.
Principales resultados:
- Identificó numerosos loci biosintéticos desconocidos en estreptococos.
- Descubrieron una modificación post-traduccional sin precedentes en los péptidos ribosómicos.
- Se caracteriza por un motivo de ciclización de tetrahidro[5,6]benzindoles.
- Se ha demostrado la formación de enlaces C-C regionales y estereospecíficos por una sola enzima RaS.
Conclusiones:
- Expandió las reacciones conocidas de los microbios en la síntesis de péptidos ribosómicos complejos.
- Destacó el potencial de los estreptococos como fuente de nuevos compuestos bioactivos.
- Avanzó la comprensión de las reacciones catalizadas por la enzima radical S-adenosilmetionina.
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