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Rapid Generation of Amyloid from Native Proteins In vitro
Published on: December 5, 2013
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Los oligómeros amiloides y las protofibrillas, pero no los filamentos, se autorreplican a partir de la lisozima
Mentor Mulaj1, Joseph Foley, Martin Muschol
1Department of Physics, University of South Florida , Tampa, Florida 33620, United States.
Journal of the American Chemical Society
|June 3, 2014
Resumen
Los oligómeros amiloides se autorreplican como los priones a temperatura corporal, a diferencia de los filamentos estables. Esta vía distinta explica cómo las estructuras amiloides crecen y causan enfermedades o funcionan.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
Sus antecedentes:
- El autoensamblaje de las fibrillas amiloides está relacionado con enfermedades como el Alzheimer y los procesos celulares funcionales.
- Existen dos vías distintas: oligómeros globulares/protofibrillas y filamentos monoméricos rígidos.
- Los oligómeros están implicados en la patogénesis, pero sus mecanismos de ensamblaje no están claros.
Objetivo del estudio:
- Investigar las distintas vías de autoensamblaje de las estructuras amiloides.
- Comprender los mecanismos de plantilla y replicación de los oligómeros y filamentos amiloides.
- Para aclarar el papel de la temperatura ambiental en la formación y estabilidad del amiloide.
Principales métodos:
- Análisis comparativo del filamento amiloide y el conjunto de oligómeros/protofibrillas.
- Ensayos de plantilla a temperaturas fisiológicas y de desnaturalización.
- Análisis cinético de los procesos de autorreplicación y polimerización.
Principales resultados:
- Los filamentos amiloides son estables a temperaturas fisiológicas, pero no pueden modelar el crecimiento de monómeros nativos.
- Los oligómeros y las protofibrillas son estables y se autorreplican utilizando monómeros nativos a temperaturas fisiológicas.
- El crecimiento de oligómeros/protofibrillas incluye autorreplicación autocatalítica y polimerización nucleada.
Conclusiones:
- Las distintas vías de ensamblaje de amiloide exhiben capacidades de plantilla diferencial basadas en la temperatura.
- Los oligómeros/protofibrillas poseen un mecanismo de autorreplicación parecido al prión.
- Comprender estas vías es crucial para descifrar las funciones patógenas y funcionales de los amiloides.
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