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相关概念视频

Phosphoinositides and PIPs01:42

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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.
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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
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The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a...
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Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
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The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
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Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
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Updated: Jun 24, 2025

Single-molecule Super-resolution Imaging of Phosphatidylinositol 4,5-bisphosphate in the Plasma Membrane with Novel Fluorescent Probes
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将类酸盐的功能与线粒分裂联系起来.

Lorenzo Prever1, Gabriele Squillero1, Emilio Hirsch1

  • 1University of Turin, Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center "Guido Tarone", Via Nizza 52, 10126 Turin, Italy.

Cell reports
|June 6, 2024
PubMed
概括
此摘要是机器生成的。

酸 (PtdIns) 是关键的脂质信使,调节细胞分裂. 在线粒分裂过程中PtdIns动态的调节失调可能会破坏细胞圆和细胞运动等必不可少的过程,影响细胞增殖.

关键词:
CP: 细胞生物学 细胞生物学

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Radiolabeling and Quantification of Cellular Levels of Phosphoinositides by High Performance Liquid Chromatography-coupled Flow Scintillation
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Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry
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科学领域:

  • 细胞生物学 细胞生物学
  • 分子生物学分子生物学
  • 脂质信号传递的方法

背景情况:

  • 氨酸 (PtdIns) 是重要的脂质第二信使,控制细胞过程.
  • 它们定位在细胞膜上,它们的酸化状态由酶和酸酶动态调节.
  • PtdIns的信号传递影响细胞平衡,增殖和膜重塑.

研究的目的:

  • 审查在线粒分裂过程中所知的类酸的功能.
  • 讨论PtdIns动态如何影响关键细胞分裂事件.
  • 探索改变PtdIns代谢对细胞分裂的影响.

主要方法:

  • 文献综述和现有关于细胞分裂中的类化物研究的综合.
  • 分析PtdIns在线粒分裂过程中的时间和空间作用.
  • 讨论涉及PtdIns激酶和酸酶的调节机制.

主要成果:

  • PtdIns在被时间调节的线粒分裂的膜重塑事件中起着关键的作用.
  • 特定的PtdIns物种招募不同的结合蛋白,控制线粒细胞的进展.
  • 异常的PtdIns的产生或去除干扰了细胞圆形化,轴方向,细胞动力学和脱离.

结论:

  • 类酸盐是线粒分裂的重要调节剂,影响细胞分裂的多个阶段.
  • 了解PtdIns的动态是理解适当的细胞分裂及其失调的关键.
  • PtdIns代谢的改变代表了细胞分裂缺陷的潜在机制.