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Assembly of Cytoskeletal Filaments01:18

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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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Assembly of Complex Microtubule Structures01:32

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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
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Rutas de autoensamblaje hacia redes cuadradas coloidales flexibles

Yogesh Shelke1, Daniel J G Pearce2, Daniela J Kraft3

  • 1Soft Matter Physics, Huygens-Kamerlingh Onnes Laboratory, Leiden Institute of Physics, Leiden University, Leiden, The Netherlands.

Nature communications
|December 26, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Los enlaces reconfigurables permiten la creación de redes cuadradas flexibles a través del autoensamblaje. Este estudio explora las vías para maximizar el rendimiento y la flexibilidad en estos materiales dinámicos.

Palabras clave:
autoensamblajeredes cuadradasenlaces reconfigurablesmateriales flexiblesciencia de materialesbiofísicacoloidesADN

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Área de la Ciencia:

  • Ciencia de Materiales
  • Biofísica
  • Ingeniería Química

Sus antecedentes:

  • La reconfigurabilidad es vital para la función de proteínas y biopolímeros, influyendo en las propiedades del material.
  • El impacto de la reconfigurabilidad de los enlaces en las vías de autoensamblaje sigue siendo poco explorado.

Objetivo del estudio:

  • Investigar cómo los enlaces reconfigurables basados en ADN influyen en las vías de autoensamblaje.
  • Crear estructuras sintonizables y flexibles con redes cuadradas utilizando un sistema coloidal binario.

Principales métodos:

  • Se utilizó un sistema modelo coloidal binario con enlaces basados en ADN móviles en la superficie.
  • Se empleó una combinación de experimentos, cálculos analíticos y simulaciones.
  • Se analizaron los efectos de la relación de tamaño, la relación numérica y la direccionalidad inducida por la forma de la partícula.

Principales resultados:

  • Se demostró que la reconfigurabilidad durante el autoensamblaje produce redes cuadradas.
  • Se mostró que estas redes son mecánicamente inestables y térmicamente flexibles.
  • Se identificaron las vías óptimas para maximizar el rendimiento y la flexibilidad de las redes cuadradas.

Conclusiones:

  • La reconfigurabilidad juega un papel crítico en los sistemas regidos por principios entálpicos y entrópicos.
  • Los hallazgos son aplicables tanto a sistemas sintéticos como biológicos.
  • El estudio proporciona información para el diseño de materiales novedosos o reconfigurables.