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Videos de Conceptos Relacionados

Tension Response at Adherens Junctions01:26

Tension Response at Adherens Junctions

The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...
Actin Filament Depolymerization01:19

Actin Filament Depolymerization

Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
In F-actin, the ADF/cofilin proteins...
Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

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.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
Mechanism of Filopodia Formation01:39

Mechanism of Filopodia Formation

Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Mechanism of Lamellipodia Formation01:31

Mechanism of Lamellipodia Formation

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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Measurement of Force-Sensitive Protein Dynamics in Living Cells Using a Combination of Fluorescent Techniques
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El estiramiento de moléculas individuales de varillas de talón activa la vinculina que se une a la vinculina.

Armando del Rio1, Raul Perez-Jimenez, Ruchuan Liu

  • 1Department of Biological Sciences, Columbia University, New York, NY 10027, USA.

Science (New York, N.Y.)
|January 31, 2009
PubMed
Resumen

El estiramiento mecánico de proteínas individuales como el talino puede exponer sitios de unión ocultos, activando interacciones moleculares. Esto revela un nuevo mecanismo de cómo las células perciben y responden a las fuerzas físicas.

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Área de la Ciencia:

  • La biofísica es la biofísica.
  • Biología celular Biología celular.
  • Mecanobiología Molecular y Mecanobiología Molecular.

Sus antecedentes:

  • Los mecanismos moleculares precisos que traducen los estímulos mecánicos en respuestas químicas celulares siguen siendo en gran medida desconocidos.
  • Comprender la mecanotransducción es crucial para descifrar la señalización celular y la organización de los tejidos.

Objetivo del estudio:

  • Para dilucidar el mecanismo molecular de la transducción de fuerza en la interacción talina-vinculina.
  • Investigar cómo la fuerza mecánica afecta la estructura de las proteínas y las interacciones de unión.

Principales métodos:

  • Utilizó técnicas de una sola molécula que incluyen pinzas magnéticas, fluorescencia de reflexión interna total (TIRF) y microscopía de fuerza atómica (AFM).
  • Aplicó fuerzas fisiológicamente relevantes a varillas de proteína de talino individuales.

Principales resultados:

  • El estiramiento mecánico de varillas de talón individuales expone sitios de unión previamente ocultos (crípticos).
  • Esta exposición inducida por la fuerza de los sitios de unión facilitó la unión de la vinculina al talino.
  • Se demostró que el estiramiento del talín activa la unión de la vinculina, iniciando la señalización aguas abajo.

Conclusiones:

  • La mecanotransducción molecular puede ocurrir a través de la exposición de sitios de unión enterrados al estiramiento de proteínas.
  • El sistema talina-vinculina ejemplifica un mecanismo en el que la fuerza altera directamente la conformación de la proteína para mediar la unión.
  • La exposición del sitio de unión inducida por el estiramiento de proteínas puede representar un principio general en la transducción de la fuerza biológica.