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相关概念视频

Glycosaminoglycans01:23

Glycosaminoglycans

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Glycosaminoglycans (GAGs), also known as mucopolysaccharides, are long and linear polymers comprising of specific repeating disaccharides - the amino sugar that can be N-acetylglucosamine or N-acetylgalactosamine, and a uronic acid that is usually glucuronic acid or iduronic acid.
GAGS are found in the extracellular matrix of vertebrates, invertebrates, and bacteria. Due to their polar nature they attract water, and serve as excellent lubricants or shock absorbers in an animal body.
Hyaluronic...
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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Proteoglycans01:05

Proteoglycans

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Glycans, a class of complex heterogeneous molecules, can be covalently attached to proteins to form glycosylated proteins that regulate various physiological and pathological processes. Glycosylated proteins or glycoproteins comprise N-linked and O-linked oligosaccharides. O-glycosylation is the most common type of protein glycosylation. Here, glycans attach to the oxygen atom of the hydroxyl groups of Serine or Threonine residues. O-linked glycosylation occurs later in protein processing,...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Oligosaccharide Assembly01:24

Oligosaccharide Assembly

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Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
Multiple sugar molecules that may or may...
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Fibril-associated Collagen01:11

Fibril-associated Collagen

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Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
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相关实验视频

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3D Hydrogel Scaffolds for Articular Chondrocyte Culture and Cartilage Generation
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人类软二硫酸盐链聚合物的结构基础

Poushalee Dutta1, Rosa L Cordeiro1, Mélanie Friedel-Arboleas1

  • 1Institut de Biologie Structurale, UMR 5075, University Grenoble Alpes, CNRS, CEA, Grenoble, France.

Nature communications
|November 26, 2025
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概括

研究人员确定了四种人类酶复合物,包括氏丁硫酸盐合成酶1 (CHSY1) 和CHSY3,构建氏丁硫酸盐链. 这些发现揭示了这些关键生物分子中的聚合机制和催化作用.

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科学领域:

  • 生物化学 生物化学
  • 葡萄糖生物学 葡萄糖生物学
  • 结构生物学 结构生物学

背景情况:

  • 丁硫酸盐是关键的多糖,参与细胞表面和细胞外基质功能.
  • 了解丁硫酸盐生物合成对于破译其在生物过程中的调节作用至关重要.

研究的目的:

  • 为了识别和表征人类酶复合物,负责氏丁硫酸盐链聚合.
  • 阐明参与氏丁硫酸盐合成的分子机制和催化活动.

主要方法:

  • 开发使用光基质的化学酶化体内糖化试验.
  • 低温电子显微镜 (cryo-EM) 用于确定CHSY3-CHPF复合物的结构.
  • 突变分析和细胞补充试验以验证酶功能.

主要成果:

  • 确定了四个异构复合物 (CHSY1-CHPF,CHSY1-CHPF2,CHSY3-CHPF,CHSY3-CHPF2) 是负责氏丁硫酸盐聚合的.
  • 所有已识别的复合物都在体外表现出链聚合活性.
  • 结构和突变分析显示CHSY1和CHSY3是酶活性成分,CHPF和CHPF2起着稳定作用.
  • 这项研究提出了基于催化部位排列的氏丁硫酸盐链聚合的非渐进式分布机制.

结论:

  • 已识别的酶复合物及其独特的作用为氏丁硫酸盐生物合成提供了分子基础.
  • CHSY1和CHSY3具有用于聚合的必不可少的双功能糖转移酶活动.
  • 拟议的聚合机制为对氏丁硫酸盐结构和功能的调节提供了新的见解.