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ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Mitochondrial Membranes01:45

Mitochondrial Membranes

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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial...
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Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

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Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
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Structure of Porins01:21

Structure of Porins

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Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
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Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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Author Spotlight: Establishing a New Fluorescence-Based Protocol for In Vivo Mitochondrial Morphology Analysis in Parkinson's Disease
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Las estructuras helicoidales OPA1 dan perspectiva a la disfunción mitocondrial

Sarah B Nyenhuis1, Xufeng Wu2, Marie-Paule Strub3

  • 1Laboratory of Cell and Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD, USA.

Nature
|August 23, 2023
PubMed
Resumen

La atrofia óptica dominante, una de las principales causas de ceguera infantil, está relacionada con mutaciones en el gen OPA1. Este estudio revela que el OPA1

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Área de la Ciencia:

  • Biología mitocondrial
  • Biología estructural
  • La genética

Sus antecedentes:

  • La atrofia óptica dominante (AOD) es una de las principales causas de ceguera infantil.
  • Las mutaciones en el gen de la proteína de atrofia óptica 1 (OPA1) representan el 60-80% de los casos de DOA.
  • OPA1 es esencial para la fusión de la membrana interna mitocondrial, la remodelación de las cristales y la dinámica mitocondrial general.

Objetivo del estudio:

  • Para aclarar la base estructural de la función OPA1 y el impacto de las mutaciones.
  • Para entender cómo OPA1 interactúa con las membranas lipídicas.

Principales métodos:

  • Se utilizó la criomicroscopia electrónica (cryo-EM) para determinar las estructuras helicoidales de OPA1.
  • Se utilizaron tubos de membrana lipídica para imitar el entorno nativo de OPA1.
  • Se utilizaron ensayos basados en células para evaluar las consecuencias funcionales de las mutaciones.

Principales resultados:

  • OPA1 forma conjuntos helicoidales densamente empacados en las membranas lipídicas.
  • Se observó una dimerización dependiente de nucleótidos de los dominios de la OPA1 GTPasa, característica de la superfamilia de las dinaminas.
  • Las estructuras secundarias únicas, incluidas las hélices de inserción de membrana, mejoran la asociación de membrana de OPA1.
  • Las mutaciones patógenas interrumpen las interfaces de ensamblaje de OPA1 y la unión a la membrana, lo que lleva a la fragmentación mitocondrial.

Conclusiones:

  • El estudio revela características estructurales clave de OPA1 esenciales para su función en la dinámica mitocondrial.
  • Las ideas estructurales explican cómo las mutaciones de OPA1 causan atrofia óptica dominante.
  • La comprensión de estas interacciones es crucial para el desarrollo de estrategias terapéuticas para las neuropatías ópticas relacionadas con OPA1.