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Real-time In Vitro Monitoring of Odorant Receptor Activation by an Odorant in the Vapor Phase
Published on: April 23, 2019
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Los residuos conservados controlan la activación de los receptores de olor acoplados a la proteína G de los mamíferos
Claire A de March1, Yiqun Yu2, Mengjue J Ni3
1Institute of Chemistry - Nice, UMR 7272 CNRS - University Nice - Sophia Antipolis, 06108 Nice cedex 2, France.
Journal of the American Chemical Society
|June 20, 2015
Resumen
Los receptores olfativos (OR), el mayor subgrupo de receptores acoplados a proteínas G (GPCR), tienen mecanismos de activación poco conocidos. Este estudio identifica residuos clave, incluido un interruptor de cambio de tirosina y un bloqueo iónico, cruciales para la función OR.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
- La neurociencia es la neurociencia.
Sus antecedentes:
- Los receptores olfativos (OR) son la familia más grande de los receptores acoplados a proteínas G (GPCR), cruciales para el olfato.
- A diferencia de los GPCR no olfativos, los OR carecen de motivos conservados esenciales para la activación, por lo que su mecanismo es poco conocido.
Objetivo del estudio:
- Para dilucidar los mecanismos moleculares de la activación del receptor del olor.
- Para identificar los residuos críticos involucrados en las vías de señalización de OR.
Principales métodos:
- Mutagénesis dirigida al sitio para alterar residuos específicos de aminoácidos.
- Sistemas de expresión heterólogos para estudiar la función del receptor.
- Simulaciones de dinámica molecular para capturar cambios conformacionales.
Principales resultados:
- Se identificó un residuo de tirosina conservado en la hélice VI como un "interruptor" clave para la detección de agonistas.
- Localizado el "bloqueo iónico" entre el motivo "DRY" en la hélice III y un residuo cargado en la hélice VI.
- Desarrolló un modelo para la activación del receptor del olor basado en estos hallazgos.
Conclusiones:
- El estudio proporciona un nuevo modelo para los mecanismos de activación de los receptores olfativos.
- Los residuos de la llave, incluyendo un interruptor de tirosina y un bloqueo iónico, son esenciales para la función OR.
- Esta investigación avanza en nuestra comprensión de la señalización de GPCR en el olfato.
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