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El sistema Panoptes utiliza nucleótidos cíclicos de señuelo para defenderse de los fagos

Ashley E Sullivan¹, Ali Nabhani², Daniel S Izrailevsky²

¹Department of Biochemistry, University of Colorado Boulder, Boulder, CO, USA.

|October 1, 2025

Resumen

Las bacterias utilizan el nuevo sistema Panoptes para defenderse de los fagos al detectar interrupciones en los segundos mensajeros de nucleótidos. Este sofisticado mecanismo de defensa se dirige a los fagos que intentan evadir la inmunidad secuestrando estas moléculas de señalización cruciales.

Área de la Ciencia:

Microbiología
Bacteriología
Virología

Sus antecedentes:

Las bacterias poseen sistemas antifágicos para combatir las infecciones virales.
Los segundos mensajeros derivados de nucleótidos son mediadores clave de la inmunidad bacteriana contra los fagos.
Los fagos desarrollan contra-defensas para agotar estos segundos mensajeros, creando una carrera armamentista evolutiva.

Objetivo del estudio:

Para caracterizar un nuevo sistema antifago llamado Panoptes.
Para aclarar el mecanismo por el cual Panoptes detecta la infección de fagos indirectamente.
Para entender el papel de los segundos mensajeros de nucleótidos en esta estrategia de defensa bacteriana.

Principales métodos:

Genética bacteriana y técnicas de biología molecular.
Determinación de la estructura cristalina de la proteína OptS.
Ensayos bioquímicos para detectar la síntesis y unión de un segundo mensajero.
Ensayos de replicación de fagos y análisis de mutaciones de escape de fagos.

Principales resultados:

Panoptes es un operón de dos genes (optSE) donde OptS sintetiza dinucleótidos cíclicos (por ejemplo, 2',3'-c-di-AMP) y OptE se une a estas señales para mediar la defensa.
OptS contiene un dominio mínimo de CRISPR polimerasa (mCpol), similar al de Cas10.
Los fagos que carecen de la proteína 2 (Acb2) del sistema de señalización antifágico basado en oligonucleótidos anticíclicos (CBASS) escaparon de la defensa de Panoptes.
El secuestro de nucleótidos de Acb2 desencadena inesperadamente una ruptura de la membrana interna mediada por OptE.

Conclusiones:

Panoptes representa una estrategia inmune bacteriana sofisticada que detecta indirectamente la infección de los fagos mediante el monitoreo del segundo grupo de mensajeros de nucleótidos.
El sistema aprovecha las tácticas de evasión de fagos (antagonismo Acb2) para desencadenar la defensa, destacando un nuevo mecanismo de evasión inmune.
Este descubrimiento arroja luz sobre la compleja interacción entre la inmunidad bacteriana y las defensas de los fagos.

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