RTN4IP1はミトコンドリア複合体I組立とCoQ生物合成の最終段階に必要である.
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PubMedで要約を見る
まとめ
この要約は機械生成です。RTN4IP1はミトコンドリア複合体Iの組み立てとコエンザイムQの生物合成に不可欠です. RTN4IP1の病原性変異はこれらの機能を損なっており,原発性ミトコンドリア疾患に寄与する.
科学分野
- 生物化学
- 分子生物学
- 遺伝学
背景
- ミトコンドリア複合体I (CI) 欠乏症はミトコンドリア疾患の約30%の原因となる.
- CI組立の分子機構は完全に理解されていません.
- RTN4IP1の変異は以前は孤立したCI欠乏症と関連していた.
研究 の 目的
- RTN4IP1のCI組立とミトコンドリア機能の役割を調査する.
- RTN4IP1をCI組立因子として確認する.
- 患者におけるRTN4IP1の二重機能を解明する.
主な方法
- RTN4IP1変異を有する患者の線維芽細胞の分析
- RTN4IP1 ノックアウト細胞の生成と研究
- コンプレックスプロファイリングでCIの組み立て中間材料を評価する.
- コエンザイムQの生物合成の評価
主要な成果
- RTN4IP1欠乏症は患者およびノックアウト細胞のCI組成欠陥を引き起こす.
- 複合体プロファイリングは,ND5モジュールの蓄積とNモジュールの生産障害を示した.
- RTN4IP1欠乏症は,コエンザイムQの生物合成も低下させた.
結論
- RTN4IP1は,端末の組み立て段階に関与する誠実なCIの組み立て要素です.
- RTN4IP1は,CIアセンブリとコエンザイムQ代謝の両方で独立した役割を持っています.
- 病原性RTN4IP1変種は両方の機能を破壊し,ミトコンドリア疾患を引き起こす.
関連する概念動画
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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...
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,...
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...
The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...