アスパラギン酸の利用可能性がマレートアスパラギン酸シャトルの差次的関与を駆動する
Julia S Brunner1, Anna E Bridgeman1, Benjamin T Jackson2
1Cell Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.
Molecular cell
|February 27, 2026
まとめ
アスパラギン酸の利用可能性はマレートアスパラギン酸シャトルを制御する
科学分野:
- 細胞代謝
- ミトコンドリア機能
- 生化学的経路
背景:
- マレートアスパラギン酸シャトル(MAS)は、細胞質還元当量をミトコンドリアに輸送する。
- 増殖細胞は、MASエンゲージメントよりも乳酸産生を好むことが多い。
- 異なる細胞状態におけるMAS使用を制限する要因は不明なままである。
研究 の 目的:
- MASエンゲージメントの調節におけるアスパラギン酸利用可能性の役割を調査する。
- 細胞増殖および分化中のMAS使用がミトコンドリア代謝にどのように影響するかを理解する。
主な方法:
- 増殖細胞および分化細胞におけるアスパラギン酸利用可能性の操作。
- グルコース由来炭素の追跡のための代謝フラックス解析。
- 電子伝達系活性およびレドックスバランスの評価。
主要な成果:
- アスパラギン酸の利用可能性はマレートアスパラギン酸シャトル(MAS)の利用範囲を決定する。
- アスパラギン酸の増加は、増殖細胞におけるMASの使用とミトコンドリアピルビン酸代謝を強化する。
- MASフラックスの上昇は、分化中のミトコンドリアネットワークにグルコース由来の炭素を供給する。
- アスパラギン酸要求量の操作は、分化細胞の代謝プロファイルを逆転させる。
結論:
- 細胞状態特異的なアスパラギン酸要求量は、マレートアスパラギン酸シャトルのエンゲージメントを決定するのに十分である。
- アスパラギン酸の利用可能性は、細胞分化中のミトコンドリア基質選択の変化を駆動する。
- MASは、細胞レドックスバランスとエネルギー代謝の協調において重要な役割を果たす。
さらに関連する動画
14:42Liquid Chromatography Coupled to Refractive Index or Mass Spectrometric Detection for Metabolite Profiling in Lysate-based Cell-free Systems
Published on: September 23, 2021
5.8K
05:59Author Spotlight: Oxygen-Independent Assays to Measure Mitochondrial Function in Mammals
Published on: May 19, 2023
3.6K
関連する概念動画
Pyruvate Oxidation
169.9K
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+...
169.9K
Allosteric Proteins-ATCase
6.7K
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
6.7K
The Citric Acid Cycle
163.5K
The citric acid cycle, also known as the Krebs cycle or TCA cycle, consists of several energy-generating reactions that yield one ATP molecule, three NADH molecules, one FADH2 molecule, and two CO2 molecules.
163.5K
The ADP/ATP Carrier Protein
4.4K
ADP/ATP carrier or AAC protein is the most abundant carrier protein in the inner mitochondrial membrane. It transports large quantities of ADP and ATP, equivalent to the average human body weight, every day. Among other transporters, ACC protein is one of the best-studied members of the mitochondrial carrier protein family. The ADP/ATP carrier protein comprises two transmembrane helices connected to a loop and a single alpha-helix on the matrix side. It switches between two conformational...
4.4K
Active Transport
2.4K
Active transport is a critical biological process that allows cells to move solutes against an electrochemical gradient. This process requires direct energy input and is characterized by its selectivity, saturability, and susceptibility to competitive inhibition.
Primary active transporters, like Na+, K+ and -ATPase, directly utilize ATP to move ions across the membrane. These transporters play significant roles in various physiological processes. For instance, Na+, K+ and -ATPase maintain...
Primary active transporters, like Na+, K+ and -ATPase, directly utilize ATP to move ions across the membrane. These transporters play significant roles in various physiological processes. For instance, Na+, K+ and -ATPase maintain...
2.4K
ATP Synthase: Mechanism
18.0K
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...
18.0K
