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Un metabolito de Pseudomonas desencadena la conversión lisogénica selectiva de los prófagos en lítico en
Magdalena Jancheva1, Thomas Böttcher1,2
1Department of Chemistry, Konstanz Research School Chemical Biology, Zukunftskolleg, University of Konstanz, 78457 Konstanz, Germany.
Journal of the American Chemical Society
|May 12, 2021
Resumen
Pseudomonas aeruginosa utiliza la pyocianina para inducir selectivamente la propagación en el Staphylococcus aureus. Este metabolito desencadena un nuevo interruptor controlado por oxidación, que ofrece nuevas vías para la terapia de fagos y aplicaciones de biología sintética.
Área de la Ciencia:
- Microbiología
- Biología molecular
- La bioquímica
Sus antecedentes:
- Los bacteriófagos influyen significativamente en las comunidades microbianas, y la mayoría existen como profágicos latentes dentro de los genomas del huésped.
- El control del cambio de estados lisogénicos a líticos es crucial, pero carece de estrategias selectivas de moléculas pequeñas.
- Comprender los mecanismos de inducción de los prófagos es clave para manipular las poblaciones microbianas.
Objetivo del estudio:
- Investigar el control de la inducción de los prófagos mediado por los metabolitos.
- Identificar las moléculas específicas de Pseudomonas aeruginosa que pueden desencadenar la actividad profágica en Staphylococcus aureus.
- Para dilucidar el mecanismo detrás de la inducción selectiva de la propagación.
Principales métodos:
- Fraccionamiento de extractos de Pseudomonas aeruginosa para aislar los compuestos activos.
- Ensayos bioquímicos y mutagénesis para confirmar la función y el mecanismo de la pyocianina.
- Análisis del cambio lisogénico a lítico en Staphylococcus aureus.
Principales resultados:
- La pyocianina, una fenozina de P. aeruginosa, fue identificada como un potente inductor de la propagación en S. aureus.
- La pyocianina demostró selectividad de los prófagos, a diferencia de los inductores no selectivos como la mitomicina C.
- Se reveló un nuevo mecanismo de inducción no canónico, independiente de la respuesta SOS y controlado por la oxidación intracelular.
Conclusiones:
- Los patógenos humanos pueden producir metabolitos que inducen selectivamente la actividad de los prófagos.
- Este descubrimiento abre posibilidades para las interacciones entre microbios y prófagos mediadas por metabolitos.
- Las aplicaciones potenciales incluyen la nueva terapia de fagos y el desarrollo de interruptores genéticos inducibles por pequeñas moléculas.
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