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Aparición de redes cooperativas de unión de glucosa en sistemas de péptidos adaptativos
Salma Kassem1, Scott A McPhee1, Naxhije Berisha1,2,3,4
1Nanoscience Initiative at Advanced Science Research Center of the Graduate Center of the City University of New York, New York, New York 10031, United States.
Journal of the American Chemical Society
|April 19, 2023
Resumen
Los investigadores diseñaron redes de péptidos adaptativos para la unión de glucosa en el agua. Este enfoque de abajo hacia arriba creó sistemas de unión cooperativos, superando los desafíos en el diseño de péptidos de unión de azúcares minimalistas.
Área de la Ciencia:
- La bioquímica
- Química supramolecular
- Ciencias de los materiales
Sus antecedentes:
- El diseño de sistemas basados en péptidos para el reconocimiento de azúcares en entornos acuosos es difícil debido a las interacciones débiles.
- Las cadenas laterales específicas de aminoácidos son cruciales para la unión cooperativa, lo que plantea un desafío de diseño.
Objetivo del estudio:
- Desarrollar una estrategia ascendente para crear redes de péptidos adaptativos capaces de unirse a la glucosa en el agua.
- Identificar los motivos de unión cooperativa a través del ensamblaje y análisis dinámicos de péptidos.
Principales métodos:
- Mezcla de glucosa con dipeptidos seleccionados y una amidasa para el alargamiento in situ de los péptidos en tetrapeptidos.
- Utilizando la espectrometría de masas de cromatografía líquida (LC-MS) para analizar los patrones de amplificación de tetrapeptidos como una lectura de las interacciones de unión.
- Variación sistemática de las entradas dipeptídicas para explorar los comportamientos emergentes de la red.
Principales resultados:
- Se identificaron dos redes coexistentes, cooperativas y dependientes del contexto basadas en enlaces de hidrógeno e interacciones CH-π.
- La amplificación de la secuencia tetrapeptídica reveló redes de unión optimizadas.
- Se ha demostrado la unión cooperativa del tetrapeptido optimizado (AWAD) con la glucosa aislada.
Conclusiones:
- El diseño de abajo hacia arriba puede generar comportamientos emergentes en sistemas complejos de péptidos a través de la autoorganización.
- Este enfoque recreó con éxito los motivos de unión cooperativa a nivel de sistema para el reconocimiento de la glucosa.
- Superó las limitaciones de los diseños reduccionistas en la creación de interacciones funcionales péptido-azúcar.
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