一个与ER相关的结构封存了错误组装的富含FG的核波林,以帮助维持核孔复合物的功能
Madison Pletan1,2, Emily Wang1, Luke Gohmann1,2
1Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI 48104, USA.
Journal of cell science
|March 13, 2025
概括
细胞内膜网膜 (ER) 在ER焦点中将错误组装的核素 (Nups) 隔离,防止核孔综合体 (NPC) 功能障碍. 这种ER封存机制对于维持核-细胞质运输至关重要,并可能影响神经退行性疾病.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 神经科学是一个神经科学.
背景情况:
- 核毛孔素 (Nups) 对于核毛孔复合体 (NPC) 的组装和功能至关重要.
- 核膜外Nups的错误组装和错误定位与细胞功能障碍和神经退行性疾病有关.
研究的目的:
- 为了研究错位核波林 (Nups) 的命运和细胞后果.
- 了解细胞管理错误组装的Nups的机制.
- 探索这些机制在与年龄相关的神经退行性疾病中的潜在作用.
主要方法:
- 结构核素Nup98的耗尽,诱导Nup的错组装.
- 显微镜观察错误组装的Nups的定位和形成.
- 基因和分子方法来识别参与隔离过程的蛋白质.
主要成果:
- 错误组装的富含 fenylalanine-glycine 的 Nups (FG-Nups) 在内 плазма网膜 (ER) 内的离散结构中积聚,称为 ER 焦点.
- 这些ER焦点的形成需要ER形态蛋白 (RTN3,ATL3,LNP) 和kinesin-1电机.
- 防止ER焦点的形成导致NPC核细胞体运输受损,这表明ER封存具有保护作用.
结论:
- 细胞内膜网膜作为一个隔间来隔离组装不当的Nups,从而保持核孔综合体 (NPC) 功能.
- 这种ER封存途径对于细胞平衡至关重要,并防止核-细胞质运输的中断.
- 了解这种机制,可以了解与Nup错位化相关的神经退行性疾病的分子基础.
相关概念视频
Nuclear Protein Sorting
4.5K
Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
4.5K
Regulation of Nuclear Protein Sorting
2.3K
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...
2.3K
Nuclear Export
3.6K
The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...
NES are of three types- the canonical 10-residue long leucine-rich signal and other...
3.6K
Nuclear Export of mRNA
7.5K
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
7.5K
Nuclear Localization Signals and Import
5.4K
Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of 2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...
5.4K
Coat Assembly and GTPases
3.5K
Vesicles incorporate different coat protein subunits in different cell locations, which changes the properties of the coat, such as the shape and geometry of the transport vesicles. Thus, vesicle coat proteins also play a significant role in cargo selection.
Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
3.5K


