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関連する概念動画

Oligosaccharide Assembly01:24

Oligosaccharide Assembly

2.8K
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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Protein Glycosylation01:25

Protein Glycosylation

6.9K
Glycosylation, the most common post-translational modification for proteins, serves diverse functions. Adding sugars to proteins makes the proteins more resistant to proteolytic digestion. Glycosylated proteins can act as markers and receptors to promote cell-cell adhesion. Additionally, they have many essential quality control functions in the cell, such as correct protein folding and facilitating transport of misfolded proteins to the cytosol, which can be degraded.
Glycosylation occurs in...
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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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二機能小分子を用いた標的型タンパク質O-GlNAcylation

Bowen Ma1, Khadija Shahed Khan1,2, Tongyang Xu1

  • 1School of Pharmacy, Faculty of Medicine, The Chinese University of Hong Kong, Sha Tin, Hong Kong.

Journal of the American Chemical Society
|April 1, 2024
PubMed
まとめ

研究者は,生きている細胞におけるタンパク質O-GlcNAcylationを正確に制御するために,新しいO-GlcNAcylation TArgeting Chimeras (OGTACs) を開発した. この突破は,疾患と治療開発におけるO-GlcNAcylationの標的研究を可能にします.

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科学分野:

  • 生物化学
  • 分子生物学
  • 化学生物学

背景:

  • タンパク質に結合したβ-N-アセチルグルコサミンの改変 (O-GlcNAcylation) は細胞プロセスにとって不可欠である.
  • 調節不良のO-GlcNAcylationは,癌,糖尿病,神経変性などの疾患に関与しています.
  • 既存の化学ツールには,O-GlcNAcylationを研究するためのタンパク質およびサイト特異性がない.

研究 の 目的:

  • プロテインO-GLNAcylationの精密な制御のための新しい化学的ツールを開発する.
  • 生体細胞におけるタンパク質特異的なO-GClNAcylationを可能にします.
  • 病気と治療開発におけるO-GlcNAcylationの役割の研究を容易にする.

主な方法:

  • O-GlcNAcylation TTargeting Chimeras (OGTAC) と呼ばれるヘテロバイ機能の小分子の開発.
  • FKBP12F36V融合したO-GlcNAc移転酵素 (OGT) を標的タンパク質に誘導するためにOGTACを使用する.
  • セルロでO-GlcNAcylationの時間,大きさ,および可逆的な制御を証明する.

主要な成果:

  • OGTACは,生体細胞におけるBRD4,CK2α,EZH2のタンパク質特異的O-GlcNAcylationを成功裏に誘導した.
  • タイム,マグニチュード,および可逆の特徴を持つ制御可能なO-GlcNAcylationを達成した.
  • O-GlcNAcylationを調節するための効果的なツールとしてOGTACを検証した.

結論:

  • OGTACは,タンパク質特異的なO-GlcNAcylationを誘導するための強力な化学プラットフォームを提供します.
  • この技術は,O-GlcNAcylation経路の詳細な機能的な解剖を可能にします.
  • OGTACは,O-GlcNAcylationに関連した疾患に対する新しい治療法を提供します.