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Mecanismo de apertura y cierre del canal del receptor de kainato

Shanti Pal Gangwar¹, Maria V Yelshanskaya¹, Kirill D Nadezhdin¹

¹Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY, USA.

|May 22, 2024

Resumen

Los receptores de kainato, cruciales para la función cerebral e implicados en enfermedades, fueron analizados estructuralmente. Los investigadores revelaron el mecanismo de bloqueo, ofreciendo información para el desarrollo de medicamentos para trastornos neurológicos.

Área de la Ciencia:

La neurociencia
Biología estructural
Farmacología molecular

Sus antecedentes:

Los receptores de kainato son receptores ionotrópicos de glutamato que son vitales para la neurotransmisión excitatoria.
Desempeñan funciones en el desarrollo y la función del sistema nervioso central y están vinculados a trastornos neurológicos / psiquiátricos.
La comprensión de la entrada del receptor kainato es crucial, pero sigue siendo poco aclarada.

Objetivo del estudio:

Para dilucidar el mecanismo molecular del receptor de kainato.
Presentar estructuras de alta resolución del receptor de kainato de GluK2 en presencia de agonistas y moduladores.
Proporcionar una base estructural para la comprensión de la activación del receptor y la modulación alostérica.

Principales métodos:

Para determinar las estructuras se empleó la crio-microscopía electrónica (crio-EM).
El receptor de kainato de GluK2 fue estudiado en complejo con el glutamato y los moduladores alostéricos positivos (concanavalina A y BPAM344).

Principales resultados:

Las estructuras revelan cómo la concanavalina A y BPAM344 inhiben la desensibilización y prolongan la activación.
La concanavalina A actúa como un espaciador, mientras que BPAM344 estabiliza la interfaz del dímero del dominio de unión al ligando.
La apertura del canal se caracteriza por la torcedura de las cuatro hélices M3 formadoras de poros.

Conclusiones:

El estudio revela la base molecular de la entrada del receptor kainato.
Se proporcionan conocimientos estructurales sobre la unión agonista y la modulación alostérica.
Los hallazgos podrían informar el desarrollo de nuevas terapias para trastornos neurológicos dirigidos a los receptores de kainato.

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