甘氨酸结构在调节GM-CSF生物活性中的作用:从甘氨酸工程的见解
bioRxiv : the preprint server for biology
|February 27, 2026
概括
颗粒细胞-巨细胞殖民地刺激因子 (GM-CSF) 的糖化对其治疗活性至关重要. 受到MGAT5影响的N-甘氨酸分支显著影响GM-CSF生物活性,突出了改善治疗的甘氨酸工程的潜力.
科学领域:
- 生物化学 生物化学
- 免疫学 免疫学 免疫学
- 生物技术是生物技术.
背景情况:
- 颗粒细胞 - 巨细胞殖民地刺激因子 (GM-CSF) 是一种用于癌症和中性衰竭治疗的糖蛋白细胞因子.
- 转基因-CSF的糖化对其免疫性,生物可用性,受体结合和生物活性产生影响.
- 在GM-CSF生产细胞中观察到Alpha-1,6-Mannosylglycoprotein 6-Beta-N-Acetylglucosaminyltransferase (MGAT5) 的表达升高.
研究的目的:
- 调查N-甘氨酸分支对GM-CSF生物活性的影响.
- 探索MGAT5在调节GM-CSF糖化和功能的作用.
- 评估糖基工程在优化GM-CSF治疗方面的潜力.
主要方法:
- 使用糖基工程的中国仓鼠卵巢细胞生产具有多种糖形式的GM-CSF变体.
- 通过TF-1细胞增殖试验评估GM-CSF变体的生物活性.
- 分析N-甘氨酸分支与GM-CSF活动之间的关系.
主要成果:
- 在GM-CSF变种中减少的N-甘氨酸分支显著抑制了它们的生物活性.
- MGAT5活性与GM-CSF的N-甘氨酸分支模式直接相关.
- 糖基化模式极大地影响了GM-CSF的疗效.
结论:
- 为了保持GM-CSF生物活性,N-甘氨酸分支是必不可少的.
- 针对GM-CSF的向甘油工程有望提高治疗效果.
- 精确控制糖化是优化基于GM-CSF的临床应用的关键.
相关概念视频
Protein Glycosylation
10.0K
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...
Glycosylation occurs in...
10.0K
Glycocalyx and its Functions
9.5K
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.
9.5K
Proteoglycans
5.0K
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,...
5.0K
Matrix Proteoglycans and Glycoproteins
5.3K
Proteoglycans are extensively glycosylated proteins, commonly found in the extracellular matrix, interwoven with collagen fibers. Hyaline cartilage, the most common type of cartilage in the body, consists of short and dispersed collagen fibers associated with large amounts of proteoglycans. These proteoglycans have long negative charges that attract cations, which in turn attract water molecules. This influx of ions and water molecules swells up the proteoglycan like a water-soaked gel that can...
5.3K
Glycosaminoglycans
7.4K
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...
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...
7.4K
Oligosaccharide Assembly
3.8K
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...
Multiple sugar molecules that may or may...
3.8K


