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Generation of Straight or Branched Actin Filaments01:14

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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.
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...
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Actin Polymerization and Cell Motility01:13

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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
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Actin Filament Depolymerization01:19

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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).
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Mechanism of Filopodia Formation01:39

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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.
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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.
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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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Video Experimental Relacionado

Updated: Aug 27, 2025

Aip1p Dynamics Are Altered by the R256H Mutation in Actin
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La maduración de la actina requiere la proteasa ACTMAP/C19orf54

Peter Haahr1,2, Ricardo A Galli3, Lisa G van den Hengel1,4

  • 1Division of Biochemistry, Netherlands Cancer Institute, 1066CX Amsterdam, Netherlands.

Science (New York, N.Y.)
|September 29, 2022
PubMed
Resumen

Los investigadores identificaron a ACTMAP como la enzima que madura la actina mediante la eliminación de la metionina después de la traducción. Su ausencia conduce a la actina inmadura, filamentos musculares más cortos y marcas distintivas de miopatía en ratones.

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In Vitro Polymerization of F-actin on Early Endosomes
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Área de la Ciencia:

  • La bioquímica
  • Biología molecular
  • Biología celular

Sus antecedentes:

  • La síntesis de proteínas generalmente comienza con metionina, que generalmente se elimina durante la traducción.
  • La actina citoplasmática sufre una modificación post-traduccional única que implica la eliminación de la metionina acetilada por una enzima desconocida.

Objetivo del estudio:

  • Identificar la enzima responsable de la modificación no canónica después de la traducción de la actina.
  • Investigar la función in vivo de esta enzima en la maduración de la actina y su papel en la fisiología muscular.

Principales métodos:

  • Identificación de enzimas mediante pruebas genéticas y bioquímicas.
  • Generación y análisis de ratones sin la enzima identificada.
  • Evaluación de la estructura citoesquelética, la longitud del filamento de actina, la función muscular y las características histológicas en ratones mutantes.

Principales resultados:

  • C19orf54, designado ACTMAP (proteasa de maduración de actina), fue identificado como la enzima responsable de eliminar la metionina acetilada de la actina.
  • La ablación de ACTMAP resultó en ratones con actina inmadura en todos los tejidos.
  • Los músculos esqueléticos de los ratones con deficiencia de ACTMAP exhibieron filamentos de actina sarcoméricos más cortos, función muscular reducida y acumulación progresiva de núcleos centralizados, indicativos de miopatía.

Conclusiones:

  • ACTMAP es la enzima crucial para la producción de actina citoplasmática madura.
  • ACTMAP juega un papel vital en el mantenimiento de la longitud normal del filamento de actina y la función muscular.
  • La deficiencia de ACTMAP conduce a miopatías relacionadas con la actina.