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相关概念视频

GPI Anchoring of Proteins in the ER Membrane01:29

GPI Anchoring of Proteins in the ER Membrane

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GPI-anchoring is a post-translational, reversible protein modification that is ubiquitous in eukaryotes. Such proteins are primarily present on the exoplasmic leaflet of the plasma membrane.
GPI-anchor structure
A sequence of 11 enzymatic reactions results in the synthesis of the complete GPI anchor consisting of a hydrophobic and a hydrophilic portion. The hydrophobic portion comprises phosphatidylinositol, while the hydrophilic part comprises polar groups like phosphoethanolamine,...
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Lipids as Anchors01:32

Lipids as Anchors

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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains...
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Anchoring Junctions01:03

Anchoring Junctions

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Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
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Activation and Inactivation of G Proteins01:22

Activation and Inactivation of G Proteins

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Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
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IP3/DAG Signaling Pathway01:11

IP3/DAG Signaling Pathway

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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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Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
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相关实验视频

Updated: Jul 4, 2025

Detection of G Protein-coupled Receptor Expression in Mouse Vagal Afferent Neurons using Multiplex In Situ Hybridization
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JAGGER的本地化和功能取决于GPI的加法.

Raquel Figueiredo1, Mónica Costa1,2, Diana Moreira1

  • 1LAQV/REQUIMTE, Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007, Porto, Portugal.

Plant reproduction
|January 31, 2024
PubMed
概括
此摘要是机器生成的。

正确的葡萄糖酸氨基 (GPI) 加剂对于JAGGER蛋白在Arabidopsis中的定位和功能至关重要. 破坏 JAGGER 中的 GPI 固装置会损害其细胞外围的局部化和防止多细胞结合的能力,从而确保适当的受精.

关键词:
阿拉比多普西斯 (Arabidopsis) 是一种植物.阿拉伯类银河系蛋白质 (AGPs)基因基因定蛋白质 (GPI-APs) 是一种与基因基因基因定蛋白质相关的蛋白质.花粉粉的相互作用.波利图贝比 (Polytubey) 是一个多元化的语言.

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Last Updated: Jul 4, 2025

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科学领域:

  • 植物生殖生物学 植物生殖生物学
  • 分子植物科学 分子植物科学
  • 细胞生物学 细胞生物学

背景情况:

  • 在开花植物中,成功的双重受精取决于精确的精子细胞输送.
  • 阿拉比多普西斯卵子通过多管区块防止多精子 (多种花粉管的吸引力).
  • 杰格 (Jagger) 是一种假定的阿拉比诺子蛋白质,对于调节花粉管入口至关重要.

研究的目的:

  • 调查甘酸氨基 (GPI) 添加在JAGGER蛋白质定位和功能中的作用.
  • 为了确定GPI是否对于JAGGER在预防多菌的体内活动是必要的.

主要方法:

  • 在Arabidopsis.中构建和表达合于黄光蛋白的JAGGER (JAGGER-cYFP).
  • 创建JAGGER变体,在预测的GPI加域中删除.
  • 使用光显微镜分析JAGGER定位.
  • 评估 JAGGER 变种在 jagger 突变体中拯救多类型表型的能力.

主要成果:

  • 功能性的JAGGER-cYFP定位在卵巢整体和传导管细胞的外围.
  • 删除预测的GPI加域破坏了JAGGER的外围定位.
  • 具有受损GPI加剂的JAGGER蛋白质未能挽救多基表型.

结论:

  • 添加GPI anchor对于JAGGER在细胞外围的正确定位至关重要.
  • 适当的JAGGER定位,取决于GPI定,对于其在体内功能来说至关重要,以防止多菌并确保Arabidopsis的成功受精.