选择性自的一种新型调节剂:TNIP1/ABIN-1调节了线粒细胞自
Rosetta Merline1, Liliana Schaefer1
1Institute of Pharmacology and Toxicology, Goethe University, Frankfurt, Germany.
Autophagy reports
|May 21, 2025
概括
TNIP1 (TNIP1/ABIN-1) 直接与LC3B-II结合,并向受损的线粒体进行降解,作为一种新的线粒体调节剂. 这一发现对于了解细胞压力相关疾病至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
背景情况:
- TNIP1/ABIN-1被认为是炎症和细胞死亡的抑制剂.
- 在TNIP1的功能基础上的精确分子机制,特别是与自和细胞死亡相关的,需要进一步阐明.
研究的目的:
- 调查TNIP1与自机制之间的相互作用,特别是微管相关蛋白1光链3 (LC3).
- 确定TNIP1在线粒体的过程中的作用,即线粒体通过自的选择性降解.
- 了解TNIP1对细胞应激反应的贡献.
主要方法:
- TNIP1的微管相关蛋白1光链3 (LC3) 相互作用区域 (LIR) 图案的解.
- 对TNIP1与LC3B-II结合的分析及其在法戈和自溶酶体上的同位化 (用LAMP1标记).
- 评估TNIP1转移到受损的线粒体及其对线粒体蛋白质降解 (VDAC1,MFN2,TOMM20) 在自刺激后的影响.
- 在TNIP1倒置后对线粒细胞衰变抑制的评估.
主要成果:
- TNIP1通过其LIR图案直接与LC3B-II结合,并在发光孔上结合.
- TNIP1在自溶酶体上发现,并在线粒细胞衰变过程中转移到受损的线粒体.
- TNIP1促进线粒体外膜蛋白的降解及其自身的降解.
- 部分但显著地抑制了TNIP1的淘汰作用.
结论:
- TNIP1被确定为一种新的,有选择性的线粒细胞衰变调节剂.
- 确立了TNIP1在促进受损线粒体降解中的作用.
- 了解TNIP1在线粒细胞衰变中的功能对于解决线粒体相关细胞应激中的病理生理结果至关重要.
相关概念视频
Autophagy
4.1K
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,...
4.1K
Translocation of Proteins into the Mitochondria
3.0K
Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
3.0K
Phosphoinositides and PIPs
7.6K
Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
7.6K
Autophagic Cell Death
2.9K
Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and...
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and...
2.9K
Delivery Pathways to the Lysosome
6.1K
Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
6.1K
Regulation of the Unfolded Protein Response
2.4K
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...
2.4K


