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Exogenous Administration of Microsomes-associated Alpha-synuclein Aggregates to Primary Neurons As a Powerful Cell Model of Fibrils Formation
Published on: June 26, 2018
Definir el orden de largo alcance y el desorden local en la alfa-sinucleína nativa utilizando acoplamientos dipolares
Pau Bernadó1, Carlos W Bertoncini, Christian Griesinger
1Institute de Biologie Structurale Jean-Pierre Ebel, CNRS-CEA-UJF, 41 rue Jules Horowitz, 38027-Grenoble Cedex, France.
Journal of the American Chemical Society
|December 22, 2005
Resumen
Este estudio revela cómo los acoplamientos dipolares residuales (RDC) pueden detectar el orden estructural de largo alcance en proteínas intrínsecamente no estructuradas. Este avance ayuda a comprender las proteínas como la alfa-sinucleína vinculada a la enfermedad de Parkinson.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Estructural Biología estructural.
- La biofísica es la biofísica.
Sus antecedentes:
- Las proteínas intrínsecamente no estructuradas (IUP) son cruciales en los procesos biológicos y las enfermedades.
- El estudio de las IUP requiere comprender su naturaleza dinámica y conjunta.
- Los acoplamientos dipolares residuales (RDC) son sensibles a la dinámica de las proteínas en escalas de tiempo de milisegundos.
Objetivo del estudio:
- Desarrollar una nueva interpretación de las RDC para proteínas desplegadas.
- Para definir simultáneamente el orden estructural de largo alcance y el muestreo conformacional local en IUP.
- Caracterizar la estructura y la dinámica de la alfa-sinucleína (alphaS), una proteína implicada en la enfermedad de Parkinson.
Principales métodos:
- Utilizó una nueva interpretación de los acoplamientos dipolares residuales (RDC).
- Se aplicó el análisis RDC para estudiar la estructura y la dinámica de la alfa-sinucleína (alphaS).
- Desarrolló un modelo estructural que combinaba fluctuaciones conformacionales locales y contactos de largo alcance.
Principales resultados:
- Demostrado que los RDC pueden informar simultáneamente sobre el orden de largo alcance y el muestreo local en proteínas desplegadas.
- Se detectaron de manera inequívoca conformadores poblados con contactos de largo alcance en alphaS.
- Se demostró que tanto las fluctuaciones locales como los contactos de largo alcance son esenciales para describir las RDC de alphaS.
Conclusiones:
- La nueva interpretación de RDC proporciona nuevos conocimientos sobre el paisaje conformacional de las IUP.
- Este enfoque revela un orden de largo alcance en sistemas altamente flexibles, previamente no detectados.
- Comprensión mejorada de la estructura y dinámica de alphaS, relevante para la enfermedad de Parkinson.
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