通过将芳香侧链置于N-糖基化反转转中来稳定蛋白的原始状态
Elizabeth K Culyba1, Joshua L Price, Sarah R Hanson
1Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA.
概括
研究人员发现了一种使用N-糖化稳定蛋白质的新方法. 通过添加特定的氨基酸序列,他们增强了蛋白质折叠和治疗应用的稳定性.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 蛋白质工程是指蛋白质工程.
背景情况:
- N-糖化对蛋白质折叠,稳定性和分泌途径中的运输至关重要.
- 基因糖化介导蛋白质稳定背后的分子机制尚未完全理解.
- 修改蛋白质糖化位为治疗和研究进步提供了潜力,但结果往往是不可预测的.
研究的目的:
- 阐明N-糖化介导蛋白质稳定的分子基础.
- 开发一种可预测的方法,通过糖化酶来增强蛋白质的稳定性.
- 为提高蛋白质稳定性设计一个便携式结构模块.
主要方法:
- 研究了在糖化位前的特定氨基酸残留的作用.
- 引入了"增强芳香序列" (在糖化位点附近的氨残留物) 进入明显的反转.
- 通过热力学测量和细胞糖化效率,评估该模块对蛋白质稳定性的影响.
主要成果:
- 在糖化阿斯巴拉金之前放置两个或三个基氨酸残留物,有助于与甘氨酸的N-乙糖胺部分稳定相互作用.
- 这种"增强的芳香序列"作为一个便携式的结构模块,用于稳定.
- 将该模块纳入三种不同的蛋白质,导致稳定能从-0.7到-2.0 kcal/mol不等,并提高了细胞糖化效率.
结论:
- 增强的芳香序列提供了一个可预测的策略,通过N-glycosylation稳定蛋白质.
- 这一发现有助于我们更好地理解糖基化在蛋白质稳定中的作用.
- 工程序列对蛋白质工程,药物开发和生物技术应用有重大影响.
相关概念视频
Protein Folding
Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Folding
Overview
RNA Stability
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
RNA Stability
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
Protein Folding Quality Check in the RER
ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
Oligosaccharide Assembly
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...


