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相关概念视频

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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Peptidoglycan Synthesis01:28

Peptidoglycan Synthesis

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Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan...
439
Formation of Lipopolysaccharides01:19

Formation of Lipopolysaccharides

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Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin,...
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Biosynthesis of Polysaccharides01:26

Biosynthesis of Polysaccharides

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Polysaccharides such as glycogen and starch are synthesized from nucleoside diphosphate sugars, primarily uridine diphosphate glucose (UDPG) and adenosine diphosphate glucose (ADPG). These activated glucose donors act as key intermediates in carbohydrate metabolism and biosynthesis. UDPG primarily involves glycogen synthesis in animals and many bacteria, while ADPG plays a fundamental role in starch synthesis in plants and certain bacteria.UDPG is formed when glucose-1-phosphate reacts with...
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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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相关实验视频

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Hierarchical and Programmable One-Pot Oligosaccharide Synthesis
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固相寡糖化合物合成与高度复杂的类甘油片段.

Yuichiro Kadonaga1, Ning Wang2, Atsushi Shimoyama3

  • 1Division of Science, Institute for Radiation Sciences, The University of Osaka, 1-1 Machikaneyama, Toyonaka 560-0043, Osaka, Japan.

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|July 12, 2025
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概括

化学家们通过固相寡糖化物合成 (SPOS) 合成了长酸甘 (PGN) 片段. 这种方法克服了溶解性挑战,为研究细菌免疫反应提供了必要的工具.

关键词:
葡萄糖酶化是什么? 葡萄糖酶化是什么?这是先天免疫力.酸甘油可以是酸甘油固体阶段的寡糖化合物合成

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科学领域:

  • 化学合成 化学合成
  • 免疫学 免疫学 免疫学
  • 碳水化合物化学 碳水化合物化学

背景情况:

  • 糖 (PGN) 碎片被Nod1和Nod2受体识别,启动炎症反应.
  • 稳定的PGN片段供应对于理解这些免疫防御机制至关重要.
  • 合成和净化长时间的PGN碎片是具有挑战性的,因为溶解度差.

研究的目的:

  • 开发一种有效的化学合成方法,用于长甘 (PGN) 碎片.
  • 为了克服PGN碎片的合成中的可溶性限制.
  • 为生物研究提供稳定的PGN碎片供应.

主要方法:

  • 使用JandaJelTM王树脂 (JJ-Wang) 合成固态寡糖化物 (SPOS).
  • 通过对β-1,4-连接的脱糖单元 (MurNAc和GlcNAc) 进行重复的糖化,构建一个八糖糖链.
  • 在混合溶剂 (C4F9OEt/CH2Cl2/THF) 中进行糖化,通过效应增强基质度.
  • 脱保护,N-和O-乙化,以及凝结.
  • 使用三酸 (TFA) 从树脂中分离.

主要成果:

  • 在10个步骤中,高效合成PGN八糖化物,总产量为19%.
  • 由于JJ-Wang树脂的高膨胀特性,成功进行了N-和O-乙化.
  • 在15个步骤中以2.3%的整体收益率与二化物获得所需的八糖.

结论:

  • 固相寡糖体合成 (SPOS) 提供了一个有效的生产长PGN片段的途径.
  • 开发的方法克服了可溶性问题,使复杂的PGN结构的合成.
  • 这一进步有助于进一步研究PGN介导的免疫信号通路.