Video Experimental Relacionado
Updated: Jan 23, 2026
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Phage Therapy Application to Counteract Pseudomonas aeruginosa Infection in Cystic Fibrosis Zebrafish Embryos
Published on: May 12, 2020
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Pseudomonas aeruginosa DEV phage explota la proteína esencial de la membrana externa LptD como receptor para la
Jimena Nieto Noblecia1, Nathan F Bellis2, Cristian A Antichi1
1Dipartimento di Bioscienze, Università degli Studi di Milano, Milan, Italy.
mBio
|January 22, 2026
Resumen
El fago DEV de Pseudomonas aeruginosa utiliza el O-antígeno del lipopolisacárido (LPS) como receptor primario. Este estudio identifica la proteína esencial de la membrana externa LptD como receptor secundario para DEV, mediado por una fibra especializada de unión al receptor, con implicaciones para la terapia fágica.
Área de la Ciencia:
- Microbiología
- Virología
- Biología Estructural
Sus antecedentes:
- El fago DEV de Pseudomonas aeruginosa, un podovirus, muestra tropismo por el O-antígeno del LPS.
- DEV puede infectar cepas que carecen de O-antígeno, lo que sugiere un receptor alternativo.
- Comprender las interacciones fago-huésped es crucial para desarrollar la terapia fágica.
Objetivo del estudio:
- Identificar el receptor secundario para el fago DEV de Pseudomonas aeruginosa.
- Caracterizar el mecanismo molecular de la adsorción de DEV a su receptor secundario.
- Explorar las implicaciones para la terapia fágica.
Principales métodos:
- Criomicroscopía electrónica (crio-EM)
- Predicción de la estructura de proteínas AlphaFold
- Análisis genético de las interacciones fago-huésped
Principales resultados:
- LptD, una proteína esencial de la membrana externa, sirve como receptor secundario para DEV.
- Una fibra de unión al receptor (RBF) compuesta por DEV gp54, gp55 y gp56 media esta interacción.
- La RBF es estructural y funcionalmente análoga a las proteínas conocidas de unión al receptor de fagos.
Conclusiones:
- DEV utiliza tanto el O-antígeno del LPS como la proteína esencial de la membrana externa LptD para la adsorción.
- El operón gp56-gp55-gp54 codifica un módulo funcional para la unión al receptor y la interacción del tapón de la cola.
- Este hallazgo amplía el repertorio conocido de receptores para los fagos de P. aeruginosa y tiene implicaciones significativas para el desarrollo de la terapia fágica.
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