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Visualization of ATP Synthase Dimers in Mitochondria by Electron Cryo-tomography
Published on: September 14, 2014
Estructura del anillo del rotor de la Na+-ATPasa tipo F de Ilyobacter tartaricus
Thomas Meier1, Patrick Polzer, Kay Diederichs
1Institut für Mikrobiologie, Eidgenössische Technische Hochschule (ETH), Zürich Hönggerberg, Wolfgang-Pauli-Str. 10, CH-8093 Zürich, Switzerland.
Science (New York, N.Y.)
|April 30, 2005
Resumen
La estructura cristalina revela cómo el Ilyobacter tartaricus hace la ATP sintasa.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Estructural Biología estructural.
- Biología Molecular Biología Molecular
Sus antecedentes:
- La adenosina 5'-trifosfato (ATP) sintasa es crucial para la producción de energía celular.
- Comprender el mecanismo de la translocación iónica en la ATP sintasa es clave para descifrar el acoplamiento de energía.
Objetivo del estudio:
- Para aclarar la base estructural de la translocación de iones de sodio en Ilyobacter tartaricus ATP sintasa.
Principales métodos:
- Cristalografía de rayos X con rayos X.
- Análisis estructural de alta resolución (resolución de 2.4 angstroms)
Principales resultados:
- Determinó la estructura simétrica de 11 veces, en forma de reloj de arena, del anillo del rotor de la subunidad c incrustada en la membrana.
- Iones de sodio identificados unidos en una conformación cerrada cerca de la superficie externa de la membrana.
- Propuso un mecanismo para la translocación iónica que implica cambios conformacionales en la subunidad de la interfaz a/c.
Conclusiones:
- La estructura proporciona información a nivel atómico sobre el mecanismo de unión y translocación de iones de sodio de la ATP sintasa.
- Los cambios de conformación en el anillo del rotor son esenciales para el transporte eficiente de iones a través de la membrana.
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