使用HaloTag在细胞表面上的De Novo甘氨酸显示:可视化盖列对糖化膜蛋白的侧向扩散和细胞外囊载荷的影响
在PubMed上查看摘要
概括
此摘要是机器生成的。这项研究引入了一种基于HaloTag的系统,用于精确地将甘氨酸添加到蛋白质中,揭示了这些结构如何通过Gal-3相互作用影响蛋白质运动和细胞外囊泡负荷.
科学领域
- 细胞生物学
- 葡萄糖生物学
- 生物化学
背景情况
- 细胞表面的葡萄糖,由多种葡萄糖组成,调节重要的生物过程.
- 由于它们的异质性和复杂的相互作用,很难理解甘氨酸的功能.
- 糖果编辑技术对于探测糖的作用至关重要.
研究的目的
- 开发一种基于HaloTag的新方法,用于特定地点的糖引入和光标记蛋白质.
- 研究N-glycans和Gal-3相互作用对膜蛋白动态的影响.
- 探索N-糖化如何影响膜蛋白的细胞外囊载荷.
主要方法
- 开发基于HaloTag的糖显示系统,用于精确的糖合成和附着.
- 使用该系统将定义的N-glycans引入光标记的感兴趣蛋白 (POI).
- 分析Gal-3和N-glycan相互作用对蛋白质侧向扩散和EV负载的影响.
主要成果
- 糖化以结构依赖的方式调节膜蛋白的横向扩散,特别是与Gal-3.
- 甲蛋白格子的形成会影响蛋白质的动态.
- N-甘氨酸的附着显著影响了膜蛋白质进入细胞外囊泡的过程.
- 该方法允许在本地糖网络内进行糖分析,而不会破坏现有结构.
结论
- 基于HaloTag的糖显示系统可以对特定的糖进行精确的功能分析.
- 甘氨酸结构和Gal-3相互作用极大地调节了膜蛋白的动态和流通.
- 这种技术为剖析细胞表面甘氨酸功能的分子机制提供了有价值的工具.
相关概念视频
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...
The glycocalyx is a carbohydrate-rich, fuzzy-appearing layer on the outer surface of the cell membrane. It is highly hydrophilic, because of this it attracts large amounts of water to the cell's surface. This aids the cell's interaction with the watery environment and also helps it to obtain substances dissolved in the water. It is also important for cell identification, self/non-self determination, and embryonic development and is used in cell-to-cell attachments to form tissues.
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...
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,...

