在Xenopus中,IgX为IgM和IgG六合体的工程策略提供了信息
Ruixue Zhang1,2, Chenggong Ji1, Shuhan Li1
1Biomedical Pioneering Innovation Center (BIOPIC), State Key Laboratory of Gene Function and Modulation Research, School of Life Sciences, Peking University, Beijing, P.R. China.
Science advances
|November 5, 2025
概括
在没有J链的情况下,Xenopus IgX形成了聚合物. 研究人员使用IgX尾部件将人类IgM和IgG设计成六合体,增强它们对B淋巴瘤细胞的治疗潜力.
科学领域:
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 聚合物免疫球蛋白与哺乳动物免疫球蛋白M (IgM) 一样,对脊椎动物免疫非常重要.
- 通常IgM通过连接链 (J链) 形成体,但Xenopus IgX可以独立聚合.
研究的目的:
- 为了确定Xenopus IgX的结构.
- 为治疗应用设计增强的IgM和IgG六合剂.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来确定IgX结构.
- IgX尾部序列被纳入人类的IgM和IgG.
- 研究人员对B淋巴瘤细胞进行了补充依赖性细胞毒性 (CDC) 的测试.
主要成果:
- 冷EM结构显示IgX是一种六合体.
- 加入IgX尾部或切断天然的IgM尾部增强了IgM六合体形成.
- 缩短的尾部使IgG六合体形成成为可能.
- 设计的IgM和IgG六量体显示出强大的CDC对B淋巴瘤细胞.
- 设计的IgG-Fc六合体作为诱,减少了CDC.
结论:
- 这项研究揭示了IgX的六边形结构及其独立于J链的聚合机制.
- 尾部工程为创建功能性IgM和IgG六合体提供了一种新的策略.
- 这些工程六合体对开发针对B细胞恶性瘤的先进生物药物充满希望.
相关概念视频
01:10Antibody 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...
01:31Hybridoma Technology
Hybridoma technology is used for the large-scale production of monoclonal antibodies. Monoclonal antibodies bind to only a single antigenic determinant or epitope. Such antibodies are used in research, diagnostics, and disease therapy. The hybridoma technology established in 1975 by Georges Köhler and Cesar Milstein was awarded the Nobel Prize in Medicine in 1984 for revolutionizing research and therapy.
Hybridoma Selection
Commonly used fusion techniques — electroporation, polyethylene glycol...
Hybridoma Selection
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01:25Antibody Structure and Classes
Antibodies, also known as immunoglobulins, are produced by B cells in response to foreign substances, such as bacteria and viruses. These proteins are critical for recognizing and neutralizing these substances, protecting the body from potential harm.
The basic structure of an antibody consists of four protein chains: two identical heavy chains and two identical light chains. These chains are held together by disulfide bonds and other non-covalent interactions, forming a Y-shaped structure.
The basic structure of an antibody consists of four protein chains: two identical heavy chains and two identical light chains. These chains are held together by disulfide bonds and other non-covalent interactions, forming a Y-shaped structure.