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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been...
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In Vitro Aggregation Assays Using Hyperphosphorylated Tau Protein
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Los filamentos tau específicos de la enfermedad se ensamblan a través de intermediarios polimórficos

Sofia Lövestam1, David Li1, Jane L Wagstaff1

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|November 29, 2023
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Resumen

Los investigadores descubrieron la estructura inicial del filamento amiloide intermedio en el ensamblaje de la proteína tau, crucial para comprender las enfermedades neurodegenerativas como el Alzheimer e informar nuevas estrategias terapéuticas.

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Área de la Ciencia:

  • La neurociencia
  • La bioquímica
  • Biología estructural

Sus antecedentes:

  • Las especies intermedias en el conjunto de filamentos amiloides están implicadas en enfermedades neurodegenerativas.
  • Los datos estructurales sobre estos intermedios son limitados, lo que dificulta la comprensión de los mecanismos de ensamblaje amiloide.

Objetivo del estudio:

  • Investigar el ensamblaje in vitro de la proteína tau truncada en filamentos amiloides.
  • Determinar las características estructurales de las especies intermedias durante la formación del filamento.

Principales métodos:

  • Se empleó microscopía electrónica criogénica de resolución temporal (cryo-EM) para estudiar el ensamblaje de tau.
  • Se utilizó la resonancia magnética nuclear (RMN) para analizar las conformaciones monoméricas de tau.

Principales resultados:

  • Se identificó un filamento amiloide intermedio inicial compartido, con un núcleo ordenado (residuos 302-316).
  • Esta estructura de núcleo también se observó en tau monomérico, adoptando conformaciones rígidas, similares a la hebra beta.
  • Los puntos de tiempo posteriores revelaron diversas estructuras intermedias dependientes de las condiciones de reacción, con la mayoría desapareciendo al final de la reacción.
  • Los filamentos finales retienen núcleos ordenados consistentes con los encontrados en muestras de cerebro humano.

Conclusiones:

  • El estudio proporciona información estructural sobre la nucleación primaria y secundaria en el ensamblaje amiloide.
  • Los hallazgos ofrecen objetivos potenciales para el desarrollo de nuevas terapias para enfermedades neurodegenerativas.