関連する実験動画
Updated: Dec 14, 2025

11:14
Modeling Paracrine Noncanonical Wnt Signaling In Vitro
Published on: December 10, 2021
1.8K
グリピカンは,遠隔信号を可能にするために,Wnt脂質部分をシールドする
Ian J McGough1, Luca Vecchia2, Benjamin Bishop2
1The Francis Crick Institute, London, UK.
Nature
|July 24, 2020
まとめ
グリピカンはWntの脂質を遮断し,Wntの溶解性の問題を解く. このメカニズムは,Wntタンパク質を保護するために,水害性空間を形成するDally-like protein (Dlp) glypicansを含む.
科学分野:
- 発達生物学
- 分子生物学
- 細胞生物学
背景:
- 組織修復と細胞運命を決定するのに Wnt タンパク質と同様に 形態遺伝子は不可欠です
- Wntタンパク質はシグナル伝達のためにパルミトエール酸変異を必要としますが,その防水性により水性環境では溶解性が困難になります.
- 粒子,エクソソーム,またはシャペロンを含むWnt輸送の既存のモデルは,Wnt溶解性を完全に説明していない.
研究 の 目的:
- Wntタンパク質が脂質変化にもかかわらず,細胞外空間で輸送されるメカニズムを調査する.
- Wntタンパク質の輸送とシグナル伝達におけるグリピカン,特にDally-like protein (Dlp) に関連するタンパク質の役割を決定する.
主な方法:
- palmitoleoylatedペプチドの存在で glypicansの構造分析
- Wnt脂質変化による変化を特定するためのグリピカンの構成分析.
主要な成果:
- 提示された証拠は,Wntの溶解性に関する以前のモデルを否定する.
- Dally-like protein (Dlp) によって定義されるグリピカンのサブクラスは,Wnt脂質をシールドすることが判明した.
- 構造的研究により,これらのグリピカンは構造変化を起こし,Wnt脂質のための水嫌性ポケットを形成することが明らかになった.
結論:
- Dlpファミリーのグリピカンは,Wntタンパク質の水性脂質分子を水性細胞外環境から保護する.
- これらのグリピカンは貯蔵庫として働き,シグナル受容体に Wnt タンパク質の転送を容易にする.
- この発見は,脂質改変型モルフォゲンの輸送とシグナル伝達のための新しいメカニズムを提供します.
関連する概念動画
Canonical Wnt Signaling Pathway
10.1K
The gene encoding the main signaling molecules of the Wnt signaling pathways (the Wnt proteins) was discovered almost four decades ago by Nüsslein-Volhard and Wieschaus. They identified and originally named the gene "wingless" (wg) after a phenotype discovered during their landmark genetic screen in Drosophila for body pattern defects. At around the same time, another researcher named Harold Varmus found that a murine tumor virus activates the mammalian wg homolog, Int-1, which...
10.1K
Non-Canonical Wnt Signaling Pathways
8.1K
Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
8.1K
Lipids as Anchors
7.0K
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...
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains...
7.0K
Mechanism of Lamellipodia Formation
3.4K
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
3.4K
IP3/DAG Signaling Pathway
13.8K
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...
13.8K
Assembly of Signaling Complexes
6.4K
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
6.4K

