相关实验视频
Updated: Jul 6, 2026

10:56
Assays for the Degradation of Misfolded Proteins in Cells
Published on: August 28, 2016
展开的故事,展开的蛋白质反应的故事
1Department of Tumor Cell Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.
Cell
|January 10, 2002
概括
新的研究确定了酵母和哺乳动物展开的蛋白质反应途径之间的关键联系. 这一发现澄清了细胞如何管理蛋白质折叠和运输的过程.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 预定用于分泌或细胞表面的蛋白质在内 плазма网膜 (ER) 中进行合成和折叠.
- 在ER中适当的蛋白质折叠和组装对于其随后的运输和功能至关重要.
- 破坏ER平衡的压力因素触发了展开的蛋白质反应 (UPR) 途径,以恢复细胞平衡.
研究的目的:
- 阐明连接酵母和哺乳动物展开蛋白质反应 (UPR) 途径的分子机制.
- 为了识别UPR路径信号级联中的缺失环节.
- 提高对细胞应激反应和蛋白质成熟过程的理解.
主要方法:
- 在酵母和哺乳动物模型中对蛋白质折叠和ER应激反应途径的比较分析.
- 利用遗传和生物化学技术研究蛋白质相互作用和信号级联.
- 使用先进的显微镜和蛋白质组分析来研究蛋白质成熟和ER质量控制.
主要成果:
- 已经确定了酵母和哺乳动物ER应激信号通路之间的关键分子联系.
- 这项研究揭示了对未展开的蛋白质反应的保护和分歧的新见解.
- 已经发现了将这两个系统连接在一起的新组件或监管机制.
结论:
- 这些发现为展开的蛋白质反应提供了统一的观点,突出了跨物种的保存机制.
- 这项研究加深了我们对细胞如何在压力下维持内质网膜功能的理解.
- 鉴定的联系对理解与蛋白质错折和ER功能障碍相关的疾病有影响.
相关概念视频
Proteins: From Genes to Degradation
Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick. Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
Transcription is the synthesis of RNA molecules by RNA...
Transcription is the synthesis of RNA molecules by RNA...
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...
Cotranslational Protein Translocation
Translocation of proteins across membranes is an ancient process that occurs even in bacteria and archaebacteria. In fact, the components of the translocation machinery are still conserved between prokaryotes and eukaryotes.
Sec61 channel partners for cotranslational translocation
During cotranslational translocation, the Sec61 channel partners with the signal recognition particle (SRP), the signal recognition particle receptor (SR), and the ribosomes to transport the nascent polypeptide chain...
Sec61 channel partners for cotranslational translocation
During cotranslational translocation, the Sec61 channel partners with the signal recognition particle (SRP), the signal recognition particle receptor (SR), and the ribosomes to transport the nascent polypeptide chain...
The Unfolded Protein Response
The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
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...
Proteins: From Genes to Degradation
Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick. Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
Transcription is the synthesis of RNA molecules by RNA...
Transcription is the synthesis of RNA molecules by RNA...

