多价值结合小麦芽聚合素的结构基础
David Schwefel1, Caroline Maierhofer, Johannes G Beck
1Department of Biology, Universität Konstanz, Germany.
Journal of the American Chemical Society
|June 10, 2010
概括
研究人员开发了多价值的N-乙葡萄糖胺 (GlcNAc) 连接物,该连接物强烈地与小麦胚芽聚合素 (WGA) 结合. 这项研究揭示了多价联体如何通过桥接蛋白位增强结合,为疾病治疗提供了一种策略.
科学领域:
- 碳水化合物-蛋白质相互作用
- 葡萄糖生物学 葡萄糖生物学
- 结构生物学是结构生物学.
背景情况:
- 抑制碳水化合物-蛋白质相互作用与多价值连接体是治疗疾病的关键.
- 了解多价值联体结合增强的分子基础对于有效的治疗设计至关重要.
研究的目的:
- 合成和表征多价值N-乙葡萄糖胺 (GlcNAc) 衍生物.
- 研究它们与小麦胚芽聚合素 (WGA) 的结合相互作用.
- 阐明增强结合亲和力背后的结构机制.
主要方法:
- 合成多价值的GlcNAc衍生物,具有不同的链接长度.
- 酶结合性莱克测定 (ELLA) 用于确定结合力 (IC50值).
- 进行X射线晶体学以分析连接体-蛋白质复杂结构.
- 核磁共振光谱法用于确定连接体的溶液构型.
主要成果:
- 确定了具有显著增强WGA结合功率 (IC50 = 9.8μM) 的双价GlcNAc配体.
- X射线结晶学揭示了四个双价联体与WGA二聚体的同时结合,弥合了所有八个结合位点.
- 一种四价新甘油显示出比GlcNAc高出25500倍的功效,结构分析表明它有预先组织以结合.
结论:
- 将邻近的蛋白质结合部位与多价值联结体相结合,是实现高亲和度相互作用的有效策略.
- 连接器结构的微妙修改可以深刻影响连接体结合亲和力.
- 这些发现为多价值结合提供了分子洞察力,有助于开发针对碳水化合物-蛋白质相互作用的新疗法.
相关概念视频
Cross-reactivity
Overview
Antibody Actions
Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
Neutralization
Antibodies can bind to pathogens, preventing them from infecting host cells. This process...
Neutralization
Antibodies can bind to pathogens, preventing them from infecting host cells. This process...
Antigens Involved in Adaptive Immunity
An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Antibody Structure
Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
B Cell Activation and Differentiation
The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
Blood Typing
Understanding an individual's blood group is a critical component of transfusion medicine. It ensures compatibility in blood transfusions, organ transplants, and even during pregnancy. Determining these blood groups involves the ABO and Rh blood typing systems, utilizing specific antigens and corresponding anti-sera to identify an individual's blood type.
Antigens are protein molecules that reside on the surface of red blood cells (RBCs). The ABO and Rh blood typing systems target antigens A,...
Antigens are protein molecules that reside on the surface of red blood cells (RBCs). The ABO and Rh blood typing systems target antigens A,...


