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Videos de Conceptos Relacionados

Introduction to Actin01:26

Introduction to Actin

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Actin is a highly conserved cytoskeletal protein found abundantly in eukaryotic cells. It constitutes 10% weight of the total cellular protein in muscle cells, while in non-muscle cells, it is lower and makes up around 1–5 percent of the total cell protein. Actin found in the unicellular amoebae and complex multicellular animals is around 80% similar, demonstrating their conservation over a billion years of evolution.  Actin coding genes are conserved within species and across...
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Actin Polymerization01:42

Actin Polymerization

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Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶  nucleation, elongation, and steady-state phase.
The nucleation phase involves forming a stable nucleus consisting of three actin monomers to form a new actin filament. Actin-binding proteins such as formins and Arp2/3 complex help filament growth post-nucleation. The Formins form straight...
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Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

2.9K
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...
2.9K
Actin Filament Depolymerization01:19

Actin Filament Depolymerization

3.0K
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...
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Formation of Higher-order Actin Filaments01:11

Formation of Higher-order Actin Filaments

2.8K
The polymerization of G-actin monomers into filamentous F-actin is a multi-step process. Once the F-actins are formed, they can bundle together in different arrangements to form higher-order networks and regulate cellular functions. Common examples include the formation of lamellipodia and filopodia at the cell's leading edge by actin reorganization in a migrating cell. The microvilli on the brush border epithelial cells are also formed through the F-actin network.
The high-order actin...
2.8K
Fibronectins Connect Cells with ECM01:25

Fibronectins Connect Cells with ECM

2.9K
Fibronectin is an adhesive glycoprotein present in the extracellular matrix of embryogenic and adult tissue. These molecules primarily aid in regulating cell motility and attachment. A fibronectin molecule is composed of two identical polypeptide chains attached to each other by a pair of disulfide bonds at the C-terminal.
Both proteoglycans and collagen are attached to fibronectin proteins, which, in turn, are attached to integrin proteins. These integrin proteins interact with transmembrane...
2.9K

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Cellular and subcellular localization of LETS protein in the nervous system.

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Cell-matrix adhesion in vascular development.

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Video Experimental Relacionado

Updated: May 5, 2026

Actin Co-Sedimentation Assay; for the Analysis of Protein Binding to F-Actin
07:53

Actin Co-Sedimentation Assay; for the Analysis of Protein Binding to F-Actin

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Relaciones entre la fibronectina (proteína LETS) y la actina.

R O Hynes, A T Destree

    Cell
    |November 1, 1978
    PubMed
    Resumen

    La fibronectina y la actina muestran una distribución coordinada en las células que se extienden, lo que sugiere un vínculo transmembrana. Esto implica que hay fibronectina.

    Área de la Ciencia:

    • Biología celular Biología celular.
    • La bioquímica es la bioquímica.
    • Investigación del citoesqueleto investigación del citoesqueleto.

    Sus antecedentes:

    • La fibronectina (proteína LETS) es una proteína clave de la matriz extracelular.
    • La actina y los filamentos intermedios son los principales componentes del citoesqueleto celular.
    • Comprender la relación espacial entre estas proteínas es crucial para los estudios de adhesión celular.

    Objetivo del estudio:

    • Para investigar la distribución de la fibronectina, la actina y los filamentos intermedios en las células de cultivo.
    • Para determinar la relación entre la fibronectina y los elementos del citoesqueleto durante la propagación celular.
    • Para explorar el papel potencial de la fibronectina en las estructuras de fijación celular.

    Principales métodos:

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    Actin Co-Sedimentation Assay; for the Analysis of Protein Binding to F-Actin
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    • Se empleó microscopía de inmunofluorescencia de doble etiqueta.
    • Se analizaron las células cultivadas para detectar la presencia y distribución de fibronectina, actina y filamentos intermedios.

    Principales resultados:

    • No se encontró ninguna relación directa entre la fibronectina y los filamentos intermedios.
    • Las tinciones de fibronectina y actina coincidieron en muchas células en expansión.
    • Se observaron correlaciones específicas entre los patrones de actina y fibronectina, especialmente en las matrices fibrilares (correspondencia del 80-100%).

    Conclusiones:

    • Los resultados sugieren una relación transmembrana entre los haces de microfilamentos de actina y la fibronectina.
    • La fibronectina puede desempeñar un papel en la formación de placas de adhesión celular.
    • Se propone una interrelación entre las placas de fijación, los microfilamentos y la fibronectina para los contactos célula-sustrato y célula-célula.