Video Experimental Relacionado

Updated: Feb 3, 2026

Hybrid Clear/Blue Native Electrophoresis for the Separation and Analysis of Mitochondrial Respiratory Chain Supercomplexes

Hybrid Clear/Blue Native Electrophoresis for the Separation and Analysis of Mitochondrial Respiratory Chain Supercomplexes

Published on: May 19, 2019

Una trayectoria de transferencia de electrones conecta las subunidades de un supercomplejo respiratorio

Hongri Gong¹, Jun Li^2,3, Ao Xu^1,4

¹State Key Laboratory of Medicinal Chemical Biology and College of Life Science, Nankai University, Tianjin 300353, China.

Science (New York, N.Y.)

|October 27, 2018

Resumen

Los investigadores determinaron la estructura de un supercomplejo respiratorio de Mycobacterium smegmatis, revelando cómo transfiere electrones y puede desintoxicar moléculas dañinas, ofreciendo ideas para el desarrollo de medicamentos contra la tuberculosis.

Área de la Ciencia:

La bioquímica
Biología estructural
Microbiología

Sus antecedentes:

Los supercomplejos respiratorios son cruciales para la respiración celular.
Mycobacterium smegmatis es un organismo modelo para el estudio de la tuberculosis.

Objetivo del estudio:

Para aclarar la estructura del supercomplejo respiratorio en Mycobacterium smegmatis.
Para entender los mecanismos de transferencia de electrones dentro del supercomplejo.
Identificar posibles objetivos farmacológicos para el tratamiento de la tuberculosis.

Principales métodos:

Microscopía cryoelectrónica (cryo-EM) con una resolución de 3,5 angstroms.
Aislamiento y purificación del supercomplejo respiratorio de Mycobacterium smegmatis.

Principales resultados:

La estructura revela un dímero complejo III asociado con subunidades complejas IV.
Una subunidad de citocromo puente facilita la transferencia de electrones del quinol al oxígeno.
Una subunidad similar a la superóxido dismutasa está presente, potencialmente desintoxicando los radicales de superóxido.

Conclusiones:

La estructura determinada proporciona una base molecular detallada para el transporte de electrones respiratorios en M. smegmatis.
Las características estructurales identificadas ofrecen objetivos potenciales para nuevos fármacos antituberculosos.
Este trabajo sienta las bases para el desarrollo de nuevas estrategias terapéuticas contra la tuberculosis humana.

Más Videos Relacionados

Analyzing Supercomplexes of the Mitochondrial Electron Transport Chain with Native Electrophoresis, In-gel Assays, and Electroelution

Analyzing Supercomplexes of the Mitochondrial Electron Transport Chain with Native Electrophoresis, In-gel Assays, and Electroelution

Published on: June 1, 2017

Translating Extracellular Electron Transfer Activities with Organic Electrochemical Transistors

Translating Extracellular Electron Transfer Activities with Organic Electrochemical Transistors

Published on: January 31, 2025

Videos de Conceptos Relacionados

Ionic Bonding and Electron Transfer

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.

Mean free path and Mean free time

Mean free path and Mean free time

Consider the gas molecules in a cylinder. They move in a random motion as they collide with each other and change speed and direction. The average of all the path lengths between collisions is known as the "mean free path."

The Supercomplexes in the Crista Membrane

The Supercomplexes in the Crista Membrane

The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...

Path Between Thermodynamics States

Path Between Thermodynamics States

Consider the two thermodynamic processes involving an ideal gas that are represented by paths AC and ABC in Figure 1:

Electron Behavior

Electron Behavior

Overview
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the...

Interference: Path Lengths

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...