相关实验视频
Updated: Feb 7, 2026
01:29
GPI Anchoring of Proteins in the ER Membrane
5.6K
埃博拉病毒糖蛋白与人类幸存者的抗体结合的结构
Jeffrey E Lee1, Marnie L Fusco, Ann J Hessell
1Department of Immunology and Microbial Science, The Scripps Research Institute, 10550 North Torrey Pines Road, Mail Drop IMM-2, La Jolla, California 92037, USA.
Nature
|July 11, 2008
概括
埃博拉病毒糖蛋白结构被揭示,与幸存者的中和抗体结合在一起. 这一发现有助于理解病毒的进入,并开发新的治疗方法.
科学领域:
- 病毒学 病毒学
- 结构生物学 结构生物学
- 免疫学 免疫学 免疫学
背景情况:
- 埃博拉病毒 (EBOV) 进入宿主细胞是由其表面糖蛋白 (GP) 介导的.
- 了解GP结构对于开发有效的抗病毒策略和治疗方法至关重要.
- 关于EBOV GP的融合前构造及其与中和抗体相互作用的先前知识是有限的.
研究的目的:
- 为了确定埃博拉病毒葡萄糖蛋白 (GP) 在其三重体的晶体结构,融合前的形状.
- 阐明中和抗体KZ52.2.的结合部位和作用机制.
- 提供有关EBOV免疫逃避策略和潜在治疗点的见解.
主要方法:
- 使用X射线结晶学来确定EBOVGP (GP1+GP2) 与KZ52抗体复合的结构.
- 结构分析的重点是GP1和GP2子单元的排列,糖盖,粘素样域和抗体结合部位.
主要成果:
- 晶体结构显示了EBOV GP在融合前的形状,GP1子单元形成杯子,GP2子单元将其摇篮.
- 观察到一种新的甘氨酸盖和类似粘素的域,限制了对受体结合部位的访问.
- 中和抗体KZ52与杯底部的蛋白质表位结合,通过交叉链接GP1和GP2区域来稳定融合前形状.
结论:
- 确定的结构为理解EBOV GP介导的膜融合提供了一个详细的分子模板.
- 这些发现表明,EBOV葡萄糖在免疫逃避中起着作用,这可能解释了幸存者的低中和抗体标位.
- 结构-抗体复合体为合理设计针对EBOV入侵的新型免疫疗法提供了基础.
相关概念视频
GPI Anchoring of Proteins in the ER Membrane
5.6K
GPI-anchoring is a post-translational, reversible protein modification that is ubiquitous in eukaryotes. Such proteins are primarily present on the exoplasmic leaflet of the plasma membrane.
GPI-anchor structure
A sequence of 11 enzymatic reactions results in the synthesis of the complete GPI anchor consisting of a hydrophobic and a hydrophilic portion. The hydrophobic portion comprises phosphatidylinositol, while the hydrophilic part comprises polar groups like phosphoethanolamine,...
GPI-anchor structure
A sequence of 11 enzymatic reactions results in the synthesis of the complete GPI anchor consisting of a hydrophobic and a hydrophilic portion. The hydrophobic portion comprises phosphatidylinositol, while the hydrophilic part comprises polar groups like phosphoethanolamine,...
5.6K
Treating Helicobacter pylori in Peptic Ulcers: Antimicrobial Therapy
1.3K
Helicobacter pylori, a resilient gram-negative bacterium, can thrive in the stomach's harsh, acidic environment. Infection with H. pylori leads to a cascade of events within the stomach lining. One of the critical disruptions caused by this bacterium is the interference with somatostatin production, a hormone responsible for regulating acid secretion. This interference tips the balance, escalating acid secretion and diminishing bicarbonate levels. This imbalance compromises the defensive...
1.3K
The Anchoring-and-Adjustment Heuristic
7.8K
In order to make good decisions, we use our knowledge and our reasoning. Often, this knowledge and reasoning is sound and solid. However, sometimes, we are swayed by biases or by others manipulating a situation. For example, let’s say you and three friends wanted to rent a house and had a combined target budget of $1,600. The realtor shows you only very run-down houses for $1,600 and then shows you a very nice house for $2,000. Might you ask each person to pay more in rent to get the...
7.8K
Anchoring Junctions
5.0K
Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
5.0K
Lipids as Anchors
7.4K
In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains...
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains...
7.4K
Complement System
10.8K
The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
10.8K