Video Experimental Relacionado
Updated: Jul 6, 2026
09:37
Optimized Negative Staining: a High-throughput Protocol for Examining Small and Asymmetric Protein Structure by Electron Microscopy
Published on: August 15, 2014
Estructura cuaternaria del complejo receptor de insulina-insulina
R Z Luo1, D R Beniac, A Fernandes
1Banting and Best Department of Medical Research, University of Toronto, Toronto, Ontario, M5G 1L6, Canada.
Science (New York, N.Y.)
|August 14, 1999
Resumen
Los investigadores determinaron la estructura 3D del receptor de insulina unido a la insulina mediante el uso de criomicroscopía electrónica. Esto revela cómo la unión a la insulina activa el receptor, iniciando las vías de señalización celular.
Área de la Ciencia:
- Biología estructural Biología estructural.
- Biología molecular y celular Biología molecular y celular
- La bioquímica es la bioquímica.
Sus antecedentes:
- El receptor de insulina (IR) es un receptor transmembrana crucial para la homeostasis de la glucosa.
- Comprender la estructura de la IR es clave para descifrar su mecanismo de activación y desarrollar terapias dirigidas.
Objetivo del estudio:
- Determinar la estructura tridimensional (3D) del receptor dimérico de insulina unido a la insulina.
- Para aclarar la base estructural de la activación del receptor mediada por insulina.
Principales métodos:
- Se empleó criomicroscopia electrónica (cryo-EM) para visualizar el complejo receptor-ligando.
- La insulina con etiqueta dorada se utilizó para identificar el dominio de unión a la insulina.
- Las subestructuras de dominio de alta resolución se ajustaron a la reconstrucción 3D para generar un modelo contiguo.
Principales resultados:
- La estructura 3D revela que las dos subunidades alfa del receptor de insulina cooperan en la unión de la insulina.
- Los dominios de la quinasa de las dos subunidades beta están posicionados muy cerca uno del otro.
- Esta yuxtaposición facilita la autofosforilación de los residuos de tirosina, un paso inicial crítico en la activación del receptor.
Conclusiones:
- El estudio proporciona un modelo estructural detallado del receptor de insulina activado.
- Los hallazgos ofrecen información sobre el mecanismo de iniciación de la señalización del receptor de insulina.
- Esta información estructural puede informar el diseño de nuevas estrategias terapéuticas para enfermedades metabólicas.
Más Videos Relacionados
09:53Using X-ray Crystallography, Biophysics, and Functional Assays to Determine the Mechanisms Governing T-cell Receptor Recognition of Cancer Antigens
Published on: February 6, 2017
11:17Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β2-Microglobulin
Published on: March 10, 2021
Videos de Conceptos Relacionados
01:10Antibody Structure
Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
02:15Protein and Protein Structure
Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme can...
A protein's shape is critical to its function. For example, an enzyme can...
01:10Antibody Structure
Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
01:24Protein Organization
Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
The primary structure of a protein is its amino acid sequence.
01:25Antibody Structure and Classes
Antibodies, also known as immunoglobulins, are produced by B cells in response to foreign substances, such as bacteria and viruses. These proteins are critical for recognizing and neutralizing these substances, protecting the body from potential harm.
The basic structure of an antibody consists of four protein chains: two identical heavy chains and two identical light chains. These chains are held together by disulfide bonds and other non-covalent interactions, forming a Y-shaped structure.
The basic structure of an antibody consists of four protein chains: two identical heavy chains and two identical light chains. These chains are held together by disulfide bonds and other non-covalent interactions, forming a Y-shaped structure.
01:28Insulin: The Receptor and Signaling Pathways
Insulin action is mediated through a receptor tyrosine kinase, akin to the IGF-1 receptor. The number of receptors per cell varies significantly, from 40 on erythrocytes to 300,000 on adipocytes and hepatocytes. The insulin receptor consists of linked α/β subunit dimers, forming a heterotetramer glycoprotein with two extracellular α subunits and two β subunits spanning the membrane. The α subunits inhibit the inherent tyrosine kinase activity of the β subunits, but this inhibition is released...