LC-MS/MS プロテオフォームプロファイリングは,ミトコンドリアにおけるシトクロームcペロキシダースの自己酸化と,そのヘムから機能的に重要な穴のホッピングを暴露する
Meena Kathiresan1, Ann M English1
1Quebec Network for Research on Protein Function, Structure and Engineering (PROTEO), and Department of Chemistry and Biochemistry , Concordia University , Montreal , QC H4B 1R6 , Canada.
Journal of the American Chemical Society
|August 28, 2018
まとめ
シトクロームc過酸化酵素 (Ccp1) プロテオフォームは,新しい機能と基板結合部位を明らかにし,根幹移転によって酸化される. このプロセスは,特にヘムラビライゼーションは,Ccp1を拡張します.
科学分野:
- 生化学と分子生物学
- 酸化還元酵素の機能
- プロテオミクス
背景:
- サイトクロームc過酸化酵素 (Ccp1) は,呼吸に関与する重要なミトコンドリア酵素である.
- 酸化ストレスにより タンパク質の機能が変化します
- タンパク質の改変を理解することは 細胞のプロセスを解読する鍵です
研究 の 目的:
- 酵母ミトコンドリアにおけるCcp1タンパク質の酸化変化を調査する.
- Ccp1酸化のメカニズムと機能的結果を解明する.
- 新しい基板結合部位とCcp1の細胞の役割を特定する.
主な方法:
- プロテオフォームプロファイリングのための液体染色体-タンデム質量スペクトロメトリ (LC-MS/MS).
- 再結合Ccp1と過酸化水素 (H2O2) を用いた in vitro酸化試験
- エクストラミトコンドリア Ccp1 プロテオフォームの特徴
主要な成果:
- LC-MS/MSでは,Ccp1タンパク質のMet,Trp,Tyrの大量酸化が示された.
- 酸化的変化はヘムからの根幹移転 (ホールホッピング) と一致する.
- ホールホッピングは,H175のヘムラビリゼーション,酸化を促進し,グルタチオンを含む新しい基板結合部位を特定します.
結論:
- ミトコンドリアにおけるCcp1の分離された酸化と減少は,新しいタンパク質を形成する.
- ホールホッピングは,カタラゼ成熟のためのヘム移転を含む電子移転を超えてCcp1の生理学的機能を拡張します.
- LC-MS/MSによるプロテオフォームプロフィーリングは,酸化還元酵素の細胞の役割を研究するための強力なツールです.
関連する概念動画
Peroxisomes and Mitochondria
96.2K
Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.
The peroxisome is a single membrane-bound cellular organelle that can perform several different functions, including lipid metabolism and chemical detoxification. The enzymes within...
The peroxisome is a single membrane-bound cellular organelle that can perform several different functions, including lipid metabolism and chemical detoxification. The enzymes within...
96.2K
Pyruvate Oxidation
169.0K
After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells.
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
169.0K
Mitochondria
20.5K
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
20.5K
Oxidation Numbers
42.8K
In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules.
42.8K
Detection of Black Holes
2.6K
Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
2.6K
Oxidation-Reduction Reactions
75.7K
Oxidation–Reduction Reactions
75.7K


