SUMO特異プロテアゼ1は,低酸素期におけるHIF1alphaの安定化に不可欠である
Jinke Cheng1, Xunlei Kang, Sui Zhang
1Department of Cardiology, The University of Texas MD Anderson Cancer Center, The University of Texas, Houston Health Science Center, Houston, TX 77030, USA.
Cell
|November 6, 2007
まとめ
セントリン/SUMO特異プロテアゼ1 (SENP1) は胎児の発達に不可欠である. SENP1の喪失は,低酸素誘導因子1alpha (HIF1alpha) の安定性を破壊して貧血を引き起こし,エリトポエチン産生に影響を与えます.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 生理学 生理学とは
背景:
- SUMOylationとdesUMOylationは,重要な規制プロセスである.
- SUMOylationとdeSUMOylationの生理学的役割は,まだ完全に理解されていません.
- セントリン/SUMO特異タンパク質酵素 (SENPs) は,SUMOylationを逆転させます.
研究 の 目的:
- SENP1欠乏の生理学的影響を調査する.
- 低酸素誘導因子1alpha (HIF1alpha) の安定性とエリトポエチン (Epo) の生成を調節するSENP1の役割を明らかにする.
主な方法:
- SENP1ノックアウトマウス (SENP1(-/-) のフェノタイプ分析.
- マウスの胚性線維芽細胞 (MEF) のSENP1(-/-) の低酸素期におけるHIF1alpha安定性とSUMOylationの調査.
- 低酸素誘発遺伝子転写 (VEGF,Glut-1) の評価について.
主要な成果:
- SENP1(-/-) の胚は,エポの生産が不足しているため,重度の胎児貧血と中産死亡率を示します.
- SENP1は,低酸素状態下でHIF1αの安定性を調節するために不可欠です.
- HIF1alphaの低酸素誘発SUMOylationは,VHL複合体経由でそのユビキチン化と分解を促進する.
- SENP1のMEFで観察されたHIF1α依存遺伝子の転写の減少.
結論:
- SENP1は,HIF1alphaの安定性を制御することによって,低酸素反応経路において重要な役割を果たします.
- SUMOylationは,ユビキチン依存タンパク質分解の直接信号として作用します.
- SENP1は,正常な赤血球形成と胚の発達に不可欠です.
関連する概念動画
Regulation of Angiogenesis and Blood Supply
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...
Hypoxia
Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Regulation of the Unfolded Protein Response
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
Caspases
Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside cells.
Regulated Protein Degradation
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Regulated Protein Degradation
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...

