Video Experimental Relacionado

Updated: Feb 9, 2026

Studying Mitochondrial Structure and Function in Drosophila Ovaries

Studying Mitochondrial Structure and Function in Drosophila Ovaries

Published on: January 4, 2017

Bases estructurales de la unión y constricción de los receptores mitocondriales por DRP1

Raghav Kalia^1,2,3, Ray Yu-Ruei Wang^1,3,4, Ali Yusuf^1,3

¹Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA, USA.

|June 15, 2018

Resumen

La fisión mitocondrial se basa en la proteína 1 relacionada con la dinamina (DRP1) y sus receptores. Este estudio revela cómo DRP1 polimeriza y forma anillos, impulsados por GTP, para regular la forma y función de los orgánulos.

Área de la Ciencia:

Biología celular
Biología molecular
La bioquímica

Sus antecedentes:

La dinámica mitocondrial, incluida la fisión, es crucial para la salud celular.
La proteína 1 relacionada con la dinamina (DRP1) y sus receptores (MID49, MID51, MFF) median la fisión mitocondrial.
Los mecanismos precisos de reclutamiento y regulación de DRP1 por sus receptores siguen sin estar claros.

Objetivo del estudio:

Para aclarar los mecanismos estructurales de ensamblaje y regulación de DRP1 por sus receptores mitocondriales.
Comprender cómo la unión de nucleótidos y la hidrólisis controlan la función de DRP1 en la fisión mitocondrial.

Principales métodos:

Microscopía crioelectrónica (cryo-EM) para determinar la estructura del DRP1 humano de cuerpo entero montado junto con el MID49.
Análisis de las mutaciones basadas en la estructura y la enfermedad en DRP1.

Principales resultados:

La unión de GTP induce el alargamiento y la rotación de DRP1, facilitando la polimerización en filamentos lineales con MID49 o MID51.
La hidrólisis y el intercambio de GTP desencadenan la disociación del receptor MID, el acortamiento del filamento y la formación de anillos DRP1.
El estudio proporciona información estructural sobre la alostería impulsada por nucleótidos que rige la función de DRP1.

Conclusiones:

Los hallazgos revelan los cambios conformacionales dinámicos de DRP1 durante la fisión mitocondrial.
Este trabajo aclara cómo los receptores DRP1 reclutan y regulan la polimerización y la constricción del anillo DRP1.
Comprender estos mecanismos es clave para comprender la herencia mitocondrial, el mantenimiento del genoma y la adaptación metabólica.

Más Videos Relacionados

Using Scaffold Liposomes to Reconstitute Lipid-proximal Protein-protein Interactions In Vitro

Using Scaffold Liposomes to Reconstitute Lipid-proximal Protein-protein Interactions In Vitro

Published on: January 11, 2017

Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding

Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding

Published on: June 9, 2017

Videos de Conceptos Relacionados

Olfactory Receptors: Location and Structure

Olfactory Receptors: Location and Structure

The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...

Internal Receptors

Internal Receptors

Many cellular signals are hydrophilic and therefore cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind to internal, or intracellular, receptors that reside within the cell. Many mammalian steroid hormones use this mechanism of cell signaling, as does nitric oxide (NO) gas.

Ligand Binding and Linkage

Ligand Binding and Linkage

Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...

Animal Mitochondrial Genetics

Animal Mitochondrial Genetics

Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...

Receptor-mediated Endocytosis

Receptor-mediated Endocytosis

The Equilibrium Binding Constant and Binding Strength

The Equilibrium Binding Constant and Binding Strength

The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium: