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相关概念视频

Regulation of the Unfolded Protein Response01:31

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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...
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The Unfolded Protein Response01:37

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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...
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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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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,...
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Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
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MAPK Signaling Cascades

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Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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相关实验视频

Updated: May 30, 2025

Measurements of Physiological Stress Responses in C. Elegans
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PEBP1增强了线粒体功能障碍诱导的综合应激反应.

Ling Cheng1, Ian Meliala1, Yidi Kong1

  • 1Centre for Cellular Biology and Signalling, Zhejiang University-University of Edinburgh (ZJU-UoE) Institute, Haining, China.

eLife
|January 29, 2025
PubMed
概括
此摘要是机器生成的。

甲基乙醇胺结合蛋白1 (PEBP1) 通过与真核转化启动因子2α (eIF2α) 相互作用来放大线粒体的应激反应. 这一发现揭示了PEBP1作为线粒体功能障碍疾病的潜在治疗点.

关键词:
这就是PEBP1的原因.细胞生物学 细胞生物学人类 人类 人类 人类 人类 人类 人类综合应激反应综合应激反应线粒体功能障碍 线粒体功能障碍

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科学领域:

  • 线粒体生物学 线粒体生物学
  • 细胞应激反应的细胞应激反应
  • 疾病的分子机制.

背景情况:

  • 线粒体功能障碍与衰老和各种疾病有关.
  • 综合应激反应 (ISR) 是细胞对应激的关键适应,包括线粒体应激.
  • 了解线粒体ISR中的分子参与者对于治疗开发至关重要.

研究的目的:

  • 研究酸乙醇胺结合蛋白1 (PEBP1) 在线粒体综合应激反应 (ISR) 中的作用.
  • 阐明PEBP1影响ISR激活和线粒体应激信号的机制.
  • 评估PEBP1在与线粒体功能障碍相关的疾病中的治疗潜力.

主要方法:

  • 基于质谱的细胞热转移测定 (MS-CETSA) 来识别由线粒体ISR稳定的蛋白质.
  • 基因沉默 (耗尽) 和PEBP1的过度表达,以评估其对ISR的功能影响.
  • 光补充测试用于研究活细胞中的蛋白质-蛋白质相互作用.

主要成果:

  • 通过诱导线粒体ISR的压力,PEBP1被热稳定,这表明其参与.
  • PEBP1 枯竭会损害线粒体的 ISR 激活,以减少 eIF2α 酸化和下游基因表达为证据.
  • PEBP1与eIF2α相互作用,这种相互作用是由eIF2α酸化调节的,独立于RAF/MEK/ERK通路.
  • PEBP1增强了由HRI激酶介导的ISR激活.

结论:

  • PEBP1在放大线粒体压力信号方面发挥着重要作用,从而增强细胞适应线粒体功能障碍的能力.
  • PEBP1与eIF2α的相互作用是其在线粒体ISR通路中的功能中的关键机制.
  • PEBP1代表了一种有前途的治疗点,用于治疗与线粒体功能障碍有关的疾病.