在差异复杂的IgG中,有可变的人类Fcγ受体-Fc亲缘关系的证据
Andrew R Crowley1, Matthew R Mehlenbacher2, Mohammad M Sajadi3,4
1Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Dartmouth College, Hanover, NH, USA.
mAbs
|July 5, 2023
概括
挑战了IgG-Fcγ受体 (FcγR) 相互作用的关联模型. 新的发现表明,FcγRs与抗原结合的IgG结合的亲和力更高,支持抗体全ostery. 这影响了对免疫反应的理解.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 生物物理学的生物物理.
背景情况:
- 抗体效应因子的功能通常通过IgG-Fcγ受体 (FcγR) 相互作用的关联模型来解释.
- 这个模型假设FcγRs同样结合自由和抗原结合的IgG,集群驱动免疫反应.
- 另一个替代的,构造性质模型提出了抗原结合变异IgG,增加FcγR亲和力.
研究的目的:
- 为了研究FcγRs的结合亲属性,自由与抗原结合的IgG相比.
- 为了确定抗原与IgG结合是否增强FcγR亲和力,支持抗体异质模型.
- 探索FcγR与自由和免疫复合体IgG结合的热力学差异.
主要方法:
- 使用多重复合,无标签的动力实验.
- 对于共价固定,捕获和抗原结合IgG的FcγR亲缘关系的特征.
- 使用直角无标签方法测量FcγR结合的热力学特征.
主要成果:
- 在测试方法中,Fcγ受体对抗原结合的IgG相比,对自由IgG的亲和力明显更大.
- 这种增强的亲和力现象在多个FcγR,抗原,抗体特异性和子类中一致.
- 自由和免疫复合体IgG之间的热力学特征有所不同,但整体亲和力趋势没有完全回顾.
结论:
- 这些发现提供了强有力的证据,支持抗体异质模型,而不是传统的关联模型.
- 与抗原结合的IgG表现出一种独特的形状,FcγRs通过更高的亲和力来识别.
- 需要进一步的研究来阐明影响FcγR结合热力学和免疫复合体识别的其他因素.
更多相关视频
06:39Author Spotlight: Characterization of Low-Affinity Protein Interactions in Solution Using MassFluidix Technology
Published on: January 26, 2024
2.2K
10:33Isolation and Characterization Of Chimeric Human Fc-expressing Proteins Using Protein A Membrane Adsorbers And A Streamlined Workflow
Published on: January 8, 2014
7.2K
相关概念视频
01:41Affinity and Avidity
36.3K
Overview
36.3K
01:10Antibody Structure
60.4K
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...
60.4K
01:57Protein Complexes with Interchangeable Parts
2.6K
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
2.6K