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ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

14.8K
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...
2.6K
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.
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...
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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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OPA1の螺旋構造は,ミトコンドリアの機能不全の視点を与える

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
まとめ

小児の失明の主な原因である 主要視力縮は OPA1 遺伝子の変異と関連しています この研究は,OPA1

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Author Spotlight: Decoding Mitochondrial Aging
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Analysis of Brain Mitochondria Using Serial Block-Face Scanning Electron Microscopy
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Analysis of Brain Mitochondria Using Serial Block-Face Scanning Electron Microscopy

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Analysis of Brain Mitochondria Using Serial Block-Face Scanning Electron Microscopy
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科学分野:

  • ミトコンドリア生物学
  • 構造生物学
  • 遺伝学

背景:

  • 主要視力衰弱 (DOA) は,子供の失明の主な原因です.
  • 光学縮タンパク質1 (OPA1) 遺伝子の変異は,DOA症例の60~80%を占めています.
  • OPA1は,ミトコンドリア内膜融合,結晶の再構築,および全体的なミトコンドリア動力学に不可欠です.

研究 の 目的:

  • OPA1機能の構造的基礎と突然変異の影響を明らかにする.
  • OPA1が脂質膜とどのように相互作用するかを理解する.

主な方法:

  • クリオ電子顕微鏡 (cryo-EM) を用いて,OPA1の螺旋構造を決定した.
  • OPA1のネイティブ環境を模倣するために,脂質膜チューブが使用されました.
  • 細胞ベースのアッセイは,変異の機能的結果を評価するために使用されました.

主要な成果:

  • OPA1は脂質膜に密集した螺旋状の組成を形成する.
  • OPA1 GTPaseドメインの核酸依存型二分化が観察され,これはダイナミン超ファミリーの特徴である.
  • 膜を挿入するヘリクスを含むユニークな二次構造は,OPA1の膜結合を強化します.
  • 病原性突然変異は,OPA1の組み立てインターフェースと膜結合を混乱させ,ミトコンドリアの断片化につながる.

結論:

  • この研究は,ミトコンドリア動態における機能に不可欠なOPA1の重要な構造特性を明らかにした.
  • 構造的な洞察は,OPA1変異が支配的な光学縮を引き起こす方法を説明します.
  • これらの相互作用を理解することは,OPA1に関連する光神経疾患の治療戦略の開発に不可欠です.