関連する実験動画
Updated: Apr 20, 2026

08:59
4D Imaging of Protein Aggregation in Live Cells
Published on: April 5, 2013
17.9K
非対称的に分裂する細胞における損傷したタンパク質のオーガネルベースの集積と保持
Chuankai Zhou1, Brian D Slaughter2, Jay R Unruh2
1Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA; Department of Molecular and Integrative Physiology, University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA.
Cell
|November 24, 2014
まとめ
酵母細胞のタンパク質の集積は,エンドプラズマ網膜 (ER) とミトコンドリアと関連しています. タンパク質毒性ストレスの管理に不可欠なこのプロセスは,細胞の年齢とともに低下し,非対称な細胞分裂と若返りに影響を与えます.
科学分野:
- 細胞生物学 細胞生物学
- 老化に関する研究
- 分子生物学は分子生物学である.
背景:
- タンパク質の集積は,老化に関連する疾患に関与するタンパク質毒性ストレスに対する細胞の防御です.
- 異常なタンパク質の集積は,細胞機能障害と疾患の病原化に寄与する.
研究 の 目的:
- 酵母におけるタンパク質集積形成のメカニズムと細胞の局所化を調査する.
- 非対称的な細胞分裂と細胞の老化におけるタンパク質集積の役割を理解する.
主な方法:
- 非対称的に分裂する酵母細胞におけるタンパク質集積の観察.
- エンドプラズマ網膜 (ER) とミトコンドリアとの総関連分析.
- ミトーシス中の総移動性と分布の評価.
主要な成果:
- タンパク質集積の形成は,新しいポリペプチド合成を必要とし,ER表面で発生します.
- アグレガートはミトコンドリアと結合し,その移動性を制限する.
- ミトーシス過程で,アグレガートは母体のミトコンドリアに結合し,老化細胞の結合は減少する.
結論:
- ミトコンドリアとタンパク質の結合は,非対称的な細胞分裂の間に分離するために不可欠です.
- 老いた細胞における集合体-ミトコンドリア関連性の低下は,若返り障害に寄与する.
- これらのメカニズムを理解することは,年齢関連のタンパク質毒性に対処するための鍵です.
関連する概念動画
Distribution of Cytoplasmic Content
4.9K
Cytokinesis segregates a cell’s chromosomes and organelles into its daughter cells. Organelles divide and grow prior to cell division but cannot be synthesized de novo; therefore, cells must receive at least one copy of each organelle to survive. Currently, many of the details of how the organelles are distributed are not yet fully elucidated.
Distribution of cytoplasmic determinants
The cytoplasm contains various organelles, as well as salts, proteins, and water. The distribution of...
Distribution of cytoplasmic determinants
The cytoplasm contains various organelles, as well as salts, proteins, and water. The distribution of...
4.9K
Export of Misfolded Proteins out of the ER
5.7K
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...
5.7K
Autophagy
6.5K
Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
6.5K
ER Retrieval Pathway
5.1K
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...
5.1K
Intralumenal Vesicles and Multivesicular Bodies
5.3K
Intraluminal vesicles (ILVs) are small vesicles 50-80 nm in diameter formed during the maturation of early endosomes. A specialized endosome containing numerous ILVs is called a multivesicular body (MVB). ILVs contain internalized molecules such as antigens, nucleic acids, proteins, and metabolites. Some of these molecules are released from the MVBs inside exosomes and are transported to other cells. Other MVBs contain molecules that are retained in the ILVs and are later degraded within the...
5.3K
Regulated Protein Degradation
9.4K
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...
9.4K

