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Use of Two Dimensional Semi-denaturing Detergent Agarose Gel Electrophoresis to Confirm Size Heterogeneity of Amyloid or Amyloid-like Fibers
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Correlación inversa entre la rigidez amiloide y el tamaño

Roy Nassar1,2,3, Eric Wong3,4, Jörg Gsponer3,4

  • 1Laufer Center for Physical and Quantitative Biology , Stony Brook University , Stony Brook , New York 11794-5252 , United States.

Journal of the American Chemical Society
|December 19, 2018
PubMed
Resumen

La rigidez de las fibrillas amiloides disminuye a medida que aumenta su tamaño. Las fibrillas amiloides más estrechas son más rígidas debido al empaque optimizado de residuos y enlaces de hidrógeno (enlaces H), lo que mejora la estabilidad mecánica.

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Área de la Ciencia:

  • La biofísica
  • Ciencias de los materiales
  • Biología estructural

Sus antecedentes:

  • Las fibrillas amiloides son agregados de proteínas implicados en varias enfermedades.
  • Las propiedades mecánicas de las fibrillas amiloides son cruciales para comprender su función y patología.
  • Las investigaciones anteriores no han aclarado completamente la relación entre el tamaño de las fibrillas amiloides y las propiedades mecánicas.

Objetivo del estudio:

  • Investigar la correlación entre la rigidez axial y el área transversal de las fibrillas amiloides.
  • Comprender los mecanismos moleculares subyacentes que impulsan la relación rigidez-tamaño observada.
  • Determinar si esta dependencia del tamaño es una característica general de las fibrillas amiloides.

Principales métodos:

  • Se utilizaron cálculos in silico para modelar y analizar las propiedades mecánicas de las fibrillas amiloides.
  • Se midió y correlacionó la rigidez axial y el área de la sección transversal.
  • Se analizó la densidad del enlace de hidrógeno (enlace H) y el empaque de residuos en relación con las dimensiones de las fibrillas.

Principales resultados:

  • Se encontró una correlación inversa significativa entre la rigidez axial y el área de la sección transversal de las fibrillas amiloides.
  • Se encontró que las fibrillas amiloides con tamaños radiales más grandes son más blandas y poseen densidades de enlaces H más bajas.
  • En el análisis de silicio se confirmó que las densidades de envasado de residuos y enlaces H determinan la relación entre la rigidez y el tamaño.

Conclusiones:

  • La nanomecánica de las fibrillas amiloides depende del tamaño, con fibrillas más estrechas que exhiben una mayor rigidez.
  • El empaque optimizado de residuos y enlaces H en el núcleo fibrilar contribuye a una mayor estabilidad mecánica en las fibrillas más estrechas.
  • Esta propiedad mecánica dependiente del tamaño es una característica global de las fibrillas amiloides, similar a su estructura de hoja transversal β.