関連する実験動画
Updated: May 5, 2026

11:36
In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones
Published on: July 25, 2019
10.6K
ユビキチネーションはPTENの核輸入と腫瘍抑制を調節する
Lloyd C Trotman1, Xinjiang Wang, Andrea Alimonti
1Cancer Biology and Genetics Program, Sloan-Kettering Institute, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA.
Cell
|January 16, 2007
まとめ
核PTENは腫瘍抑制に不可欠であり,その輸入はモノウビキチン化によって媒介されます. 癌に関連したPTEN変異は,このプロセスを破壊し,タンパク質の安定性に影響を及ぼすことによって腫瘍の進行に影響を与えます.
科学分野:
- 分子生物学は分子生物学である.
- がん生物学 がん生物学
- バイオケミストリー バイオケミストリー
背景:
- PTEN腫瘍抑制剤は,がんでは頻繁に変化します.
- PTENは通常,プラズマ膜の脂質フォスファタゼとして機能し,PI3K/AKT経路を阻害する.
- 核PTENの局所化の役割とメカニズムは,依然としてほとんど不明です.
研究 の 目的:
- 腫瘍抑制における核PTENの局所化のメカニズムと重要性を調査する.
- PTENの核インポートと安定性における翻訳後の改変の役割を明らかにする.
- 癌に関連した変異がPTENの機能と局所化にどのように影響するかを理解する.
主な方法:
- 癌細胞と患者の組織におけるPTENの局所化の分析.
- PTENモノウビキチン化とその核輸入における役割に関する調査.
- カウデン症候群に関連するK289Eを含むPTENライシン変異体の特徴.
- PTENポリユビキチネーションの評価と,細胞質の分解に対するその影響.
主要な成果:
- 核PTENは,腫瘍抑制に不可欠である.
- PTENの原発輸入は,特定のライシン残基でのモノウビキチン化によって規制されています.
- カウデン症候群に関連したPTEN変異体 (K289E) は,モノウビキチン化に欠陥があるため,核インポートが低下している.
- ポリウビキチネーションは,核輸入のモノウビキチネーションの安定効果と対照的に,細胞質の分解のためにPTENを標的とする.
- 癌に関連したPTEN変異は,その翻訳後の改変を標的とし,タンパク質の安定性と腫瘍の進行に影響を与えます.
結論:
- モノウビキチネーションによって調節されるPTENの核の局所化は,腫瘍抑制機能に極めて重要です.
- 癌に関連した変異によって,PTENの翻訳後の改変,特にモノウビキチネーションの調節障害は,腫瘍の進行に寄与する.
- PTENの翻訳後の改変をターゲットにすることは,がん治療におけるタンパク質の分解と安定化を区別するための潜在的な戦略を提供します.
関連する概念動画
Covalently Linked Protein Regulators
8.2K
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
These groups modify specific amino acids in a protein....
8.2K
Regulation of Nuclear Protein Sorting
2.5K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
2.5K
Abnormal Proliferation
4.0K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.0K
Loss of Tumor Suppressor Gene Functions
4.9K
Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
4.9K
Cancer-Critical Genes II: Tumor Suppressor Genes
8.3K
Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
8.3K
PI3K/mTOR/AKT Signaling Pathway
5.1K
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a...
5.1K

