関連する概念動画
01:34Directing Proteins to the Rough Endoplasmic Reticulum
The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
01:26Protein Modifications in the RER
Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
01:29GPI Anchoring of Proteins in the ER Membrane
GPI-anchoring is a post-translational, reversible protein modification that is ubiquitous in eukaryotes. Such proteins are primarily present on the exoplasmic leaflet of the plasma membrane.
GPI-anchor structure
A sequence of 11 enzymatic reactions results in the synthesis of the complete GPI anchor consisting of a hydrophobic and a hydrophilic portion. The hydrophobic portion comprises phosphatidylinositol, while the hydrophilic part comprises polar groups like phosphoethanolamine,...
GPI-anchor structure
A sequence of 11 enzymatic reactions results in the synthesis of the complete GPI anchor consisting of a hydrophobic and a hydrophilic portion. The hydrophobic portion comprises phosphatidylinositol, while the hydrophilic part comprises polar groups like phosphoethanolamine,...
01:27Transducer Mechanism: Enzyme-Linked Receptors
Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include:
Major types that are helpful drug targets include:
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p400複合体は,E1A変換の重要なターゲットである.
Cell
|August 18, 2001
まとめ
研究者らは,E1A媒介による変換に不可欠な新しいE1A結合タンパク質複合体を特定しました. コアコンポーネントであるp400とその関連タンパク質は,このプロセスに不可欠であり,細胞変容におけるその役割を強調しています.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- 腫瘍学 腫瘍学
背景:
- E1Aタンパク質は,細胞変容を誘発することが知られている重要なウイルスオンコタンパク質です.
- E1A媒介による変異の背後にある分子メカニズムを理解することは,がん研究にとって極めて重要です.
研究 の 目的:
- E1A.と相互作用する新しいタンパク質複合体を特定し,特徴づけること.
- E1A媒介の細胞変容におけるこれらの複合体の役割を明らかにする.
主な方法:
- コイムノプレシピテーションは,E1Aの結合パートナーを特定するための検査である.
- 特定されたタンパク質複合体の生化学的特徴.
- E1A変異体とタンパク質の断片を用いた機能的測定法で,変換活動を評価する.
主要な成果:
- 核成分としてp400を含む新しいE1A結合タンパク質複合体の特定.
- E1A-p400複合体は,E1A媒介による変換に不可欠であることを実証.
- E1Aとc-mycがp400複合体のサブユニット組成を調節できることを示す証拠.
結論:
- E1A-p400複合体は,E1Aの変換プロセスにおいて重要な役割を果たしています.
- E1Aとc-mycによるp400複合体の組成の変化は,変換抑制の役割を示唆しています.