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Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Actin Polymerization01:42

Actin Polymerization

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 actin...
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...
Formation of Higher-order Actin Filaments01:11

Formation of Higher-order Actin Filaments

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 networks...
ATP Synthase: Structure01:18

ATP Synthase: Structure

ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...

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La estructura cristalina del complejo Arp2/3

R C Robinson1, K Turbedsky, D A Kaiser

  • 1Structural Biology Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.

Science (New York, N.Y.)
|November 27, 2001
PubMed
Resumen

Determinamos la estructura del complejo Arp2/3 bovino, crucial para la polimerización de la actina en las células eucariotas. Esto revela las interacciones de proteínas clave y predice cómo las proteínas WASp / Scar activan el complejo Arp2 / 3 para la ramificación del filamento.

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Área de la Ciencia:

  • Biología celular Biología celular.
  • Biología Estructural Biología estructural.
  • La bioquímica es la bioquímica.

Sus antecedentes:

  • El complejo Arp2/3 es esencial para iniciar la nucleación del filamento de actina y la ramificación en las células eucariotas.
  • Comprender su estructura es clave para descifrar los mecanismos de la dinámica de la actina y la motilidad celular.

Objetivo del estudio:

  • Para determinar la estructura cristalina de alta resolución del complejo Arp2/3 bovino.
  • Para aclarar la base estructural de Arp2/3 complejo de ensamblaje y función.

Principales métodos:

  • Se utilizó la cristalografía de rayos X para determinar la estructura cristalina.
  • La estructura se resolvió a una resolución de 2,0 angstroms.

Principales resultados:

  • La estructura cristalina del complejo Arp2/3 bovino, que comprende siete proteínas, se determinó con una resolución de 2,0 angstroms.
  • La proteína 2 relacionada con la actina (Arp2) y Arp3 comparten pliegues similares a la actina con características de superficie únicas.
  • Se identificaron interacciones específicas de subunidades, incluidas asociaciones alfa-hélices en el núcleo y un dominio beta-hélice en ARPC1 que pueden interactuar con filamentos de actina.

Conclusiones:

  • Los datos estructurales proporcionan información sobre la arquitectura del complejo Arp2/3 y la organización de las subunidades.
  • Se propone un modelo en el que las proteínas WASp/Scar facilitan la activación del complejo Arp2/3 posicionando Arp2 y Arp3 para la nucleación de filamentos de actina ramificados.