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Los eventos de activación de la deconstrucción en la rodopsina.

Elena N Laricheva1, Karunesh Arora, Jennifer L Knight

  • 1Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.

Journal of the American Chemical Society
|July 12, 2013
PubMed
Resumen
Este resumen es generado por máquina.

La protonación de E134 en la rodopsina (Rh) está relacionada con el movimiento de la hélice H6 durante la activación. Este proceso dependiente del pH revela E1344.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología Estructural Biología estructural.
  • La biofísica computacional es una biofísica computacional.

Sus antecedentes:

  • Los receptores acoplados a proteínas G de clase A (GPCR) experimentan cambios estructurales significativos durante la activación, lo que implica una reorganización de la red interhelical.
  • En la rodopsina (Rh), la activación está acoplada al estado de protonación del glutamato 134 (E134), pero su papel preciso sigue sin estar claro.
  • El estudio de milisegundos, los procesos dependientes del pH como la protonación E134 presenta desafíos experimentales.

Objetivo del estudio:

  • Para dilucidar los mecanismos estructurales que subyacen a la protonación E134 durante la activación de la rodopsina.
  • Para investigar la interacción entre el estado de protonación E134 y el movimiento de la hélice H6.
  • Para refinar los modelos existentes de activación de la rodopsina a nivel atómico.

Principales métodos:

  • Desarrollo de un esquema computacional que combina las cuentas armónicas de Fourier (HFB) y la dinámica molecular de pH constante con el intercambio de réplicas basado en pH (pH-REX).
  • Simulación de cambios estructurales a lo largo de la vía de activación en función de la protonación E134.
  • Análisis de las reorganizaciones de la red interhelical y la dinámica de los puentes de sal.

Principales resultados:

  • La protonación E134 se desencadena por una inclinación de ~4.0° y ~23° de rotación de la hélice H6.6.
  • El movimiento de H6 interrumpe los puentes de sal (E247-R135, R135-E134), liberando E134 y aumentando su pKa por encima del pH fisiológico.
  • El aumento de la hidrofobidad local promueve aún más el movimiento de H6 y el desplazamiento hacia arriba de E134 pKa, lo que indica un mecanismo acoplado.

Conclusiones:

  • El interruptor de protonación E134 es a la vez causa y consecuencia del movimiento H6 durante la activación de la rodopsina.
  • Este estudio proporciona información a nivel atómico sobre un mecanismo de activación dependiente del pH que no es fácilmente accesible experimentalmente.
  • Los hallazgos refinan el modelo secuencial de activación de la rodopsina, destacando la interacción dinámica de los elementos estructurales.