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ERD2遺伝子は,光のERタンパク質保持システムの特異性を決定する
M J Lewis1, D J Sweet, H R Pelham
1MRC Laboratory of Molecular Biology, Cambridge, England.
Cell
|June 29, 1990
まとめ
ERD2遺伝子は,細胞内のエンドプラズマ網膜 (ER) のタンパク質を保持する受容体をコードします. この受容体は受容体です.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- タンパク質の密輸 タンパク質の密輸
背景:
- ルミナルエンドプラズマ網膜 (ER) のタンパク質は,分泌を防ぐC端信号を有しています.
- Saccharomyces cerevisiae (S. cerevisiae) では,テトラペプチド配列HDELが,この保持信号として機能する.
- ERD2遺伝子製品は,ERタンパク質の認識と回収のための受容体候補である.
研究 の 目的:
- ERタンパク質保持システムの特異性を調査する.
- ERD2遺伝子がC端末保持信号を認識する役割を決定する.
主な方法:
- Kluyveromyces lactis (K. lactis) の推定ERタンパク質を分析し,HDELとDDELのC端末配列を特定しました.
- S. cerevisiae. ERD2およびK. lactis ERD2遺伝子のS. cerevisiae.における機能分析
- 異なるERD2変種によるDDELとHDEL信号の認識に関する比較研究.
主要な成果:
- K. lactisのERタンパク質は,HDELまたはDDEL (例えばBiP) で終了することができます.
- S. cerevisiaeは,DDEL信号の認識が非効率であることを示しています.
- S. cerevisiaeのERD2遺伝子をK. lactisのホモログに置き換えることで,DDELとHDELの両方の効率的な認識が可能になります.
結論:
- ERD2遺伝子は,ERタンパク質保持システムの特異性を決定する.
- ERD2は,光のERタンパク質の分類を担当する受容体をコードします.
- この発見は,細胞タンパク質の密輸と局所化における重要なメカニズムを明らかにしています.
関連する概念動画
Role of ER in the Secretory Pathway
Eukaryotic cells have a special pathway that enables communication between various intracellular membrane-bound compartments and also with the extracellular environment. This pathway is termed as the secretory pathway.
Components of the secretory pathway
About a third of proteins synthesized in the cell are sorted via the secretory route. They shuffle between different compartments in membrane-bound vesicles until they reach their final destination. The main intracellular compartments involved...
Components of the secretory pathway
About a third of proteins synthesized in the cell are sorted via the secretory route. They shuffle between different compartments in membrane-bound vesicles until they reach their final destination. The main intracellular compartments involved...
ER Retrieval Pathway
In the secretory pathway, vesicles transport proteins from one cellular compartment to another in forward transport to deliver the protein to its correct location. Occasionally, misfolded proteins and incorrect proteins escape their original compartments, and a retrieval pathway is used to return the escaped proteins to their original compartment.
The ER uses many checkpoints to prevent the entry of incorrectly folded or a resident protein as cargo onto a transport vesicle. These mechanisms...
The ER uses many checkpoints to prevent the entry of incorrectly folded or a resident protein as cargo onto a transport vesicle. These mechanisms...
The Endoplasmic Reticulum
The endoplasmic reticulum or ER makes up for more than half of the membranes in a cell and accounts for 10% of total cell volume. It is also the primary protein and lipid synthesis factory for most cell organelles, such as the Golgi apparatus, lysosomes, secretory vesicles, and the plasma membrane. Despite being the most extensive and functionally complex subcellular organelle, ER was the last to be discovered. After years of deliberation, Keith Porter and George Palade in the year 1954,...
Directing 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...
Export of Misfolded Proteins out of the ER
After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
Assembly of the Lipid Bilayer in the ER
Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
A large chunk of any biological membrane is composed of phospholipids. These lipids have a heterogeneous distribution across different subcellular organelles and even between...
A large chunk of any biological membrane is composed of phospholipids. These lipids have a heterogeneous distribution across different subcellular organelles and even between...

