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関連する概念動画

Protein Transport into the Inner Mitochondrial Membrane01:34

Protein Transport into the Inner Mitochondrial Membrane

4.1K
Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
Transport of mitochondrial precursors across the TIM23 channel is driven by...
4.1K
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

3.2K
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,...
3.2K
Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

4.4K
Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
4.4K
Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

3.2K
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...
3.2K
Energy to Drive Translocation01:37

Energy to Drive Translocation

2.1K
Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
Generally, polypeptides are unfolded by two distinct...
2.1K
Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

2.6K
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

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Updated: Aug 24, 2025

Assessment of Submitochondrial Protein Localization in Budding Yeast Saccharomyces cerevisiae
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Assessment of Submitochondrial Protein Localization in Budding Yeast Saccharomyces cerevisiae

Published on: July 19, 2021

3.0K

MTCH2はミトコンドリア外膜タンパク質挿入酵素である.

Alina Guna1, Taylor A Stevens2, Alison J Inglis2

  • 1Whitehead Institute for Biomedical Research, Massachusetts Institute of Technology, Cambridge, MA 02142, USA.

Science (New York, N.Y.)
|October 20, 2022
PubMed
まとめ
この要約は機械生成です。

ミトコンドリア外膜タンパク質MTCH2は挿入酵素として作用し,様々なタンパク質の適切な局所化を促進する. この発見は,MTCH2の機能障害を説明します.

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Last Updated: Aug 24, 2025

Assessment of Submitochondrial Protein Localization in Budding Yeast Saccharomyces cerevisiae
08:55

Assessment of Submitochondrial Protein Localization in Budding Yeast Saccharomyces cerevisiae

Published on: July 19, 2021

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Reconstitution of Msp1 Extraction Activity with Fully Purified Components
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科学分野:

  • 細胞生物学
  • 分子生物学
  • 生物化学

背景:

  • ミトコンドリアの外膜タンパク質は 細胞の信号伝達に不可欠です
  • この膜に様々な種類のタンパク質を挿入するメカニズムは,まだ完全に理解されていません.

研究 の 目的:

  • ミトコンドリア外膜にテールアンカー,シグナルアンカー,マルチパスタンパク質を挿入するタンパク質を特定し,特徴づけること.
  • このタンパク質の機能と進化の起源を明らかにする

主な方法:

  • 重要なタンパク質を特定するために全ゲノムCRISPRスクリーンを用いた.
  • プロテオリポソームにタンパク質の浄化と再構成が行われました.
  • 機能的および変異的分析が行われました.

主要な成果:

  • ミトコンドリアキャリアホモログ2 (MTCH2) は,ベータバレルタンパク質を除く様々なトランスメブランタンパク質を挿入するのに不可欠であると特定されました.
  • 精製されたMTCH2は,タンパク質の挿入を媒介する十分な効果を in vitroで示した.
  • MTCH2はゲートキーパーとして機能し,誤った位置づけを防止し,アポトーシスのような細胞プロセスに影響を与えます.

結論:

  • MTCH2はミトコンドリアの外膜における新しいタンパク質挿入酵素として機能する.
  • ゲートキーパーとしての役割は タンパク質の局所化とアポトーシスに対する細胞の敏感性に影響します
  • MTCH2の理解は,その機能不全に関連した疾患状態に関するメカニズム的洞察を提供します.