结合IgM Cμ1域的化学Fab:对物理化学性质的洞察
Rara Sugimoto1, Masato Kiyoshi2, Hitomi Nakamura1
1Faculty of Pharmaceutical Sciences, Sojo University, 4-22-1 Ikeda, Nishi-ku, Kumamoto 860-0082, Japan.
Journal of biochemistry
|February 5, 2026
概括
在抗体碎片 (Fabs) 中研究IgM Cμ1域揭示了N-链接糖化对稳定性至关重要. 这种糖化抑制聚合,并提高了工程制造厂的热稳定性.
科学领域:
- 生物化学 生物化学
- 免疫学 免疫学 免疫学
- 蛋白质工程是指蛋白质工程.
背景情况:
- 对抗体片段 (Fabs) 的大部分研究都集中在IgG上,对其他同型的理解有限.
- 在Fab结构和功能中IgM常数域Cμ1的作用在很大程度上是未被探索的.
研究的目的:
- 研究人类IgM Cμ1域对Fab物理化学性质的影响.
- 确定Cμ1域内N结合甘化对Fab稳定性和聚合的作用.
主要方法:
- 通过将IgG1 CH1域替换为人类IgM Cμ1域,设计了一个模拟Fab (Cμ1Fab).
- 在CHO细胞中表达Cμ1Fab并使用SDS-PAGE,PNGase F处理,SPR和DSC评估其特性.
- 为了进行比较分析,创建了一个N-糖化基因突变 (N166A).
主要成果:
- Cμ1Fab保留了与野生类型Fab相比较的抗原结合活性.
- 在Cμ1域内的N结合甘化显著抑制聚合并增强热稳定性 (Cμ1Fab的Tm=66.0°C与N166A突变的60.5°C对比).
- 与Cμ1Fab.相比,N166A突变体表现出明显的聚合,其热稳定性大大降低.
结论:
- 在IgM Cμ1域内的原生N链接糖化在维护Fab稳定性方面起着至关重要的作用.
- 这些发现为抗体工程提供了宝贵的见解,特别是为开发更稳定的抗体基础疗法.
相关概念视频
01:21Factors Affecting Drug Biotransformation: Physicochemical and Chemical Properties of Drugs
761
A drug's physicochemical properties fundamentally influence its metabolism. For instance, a drug's molecular size and shape critically determine its interaction with enzymes and transporters — larger drugs may face difficulty reaching enzyme active sites, altering their metabolic pathways. The pKa of a drug, which establishes its ionization state, can impact its solubility and absorption, thereby influencing metabolism.
The drug's acidity or basicity is essential in...
The drug's acidity or basicity is essential in...
761
01:31Factors Affecting Renal Clearance: Drug's Physicochemical Properties and Plasma Levels
601
Renal clearance of a drug is influenced by various factors, including its physicochemical properties and plasma levels. These factors play a significant role in determining how efficiently the kidneys eliminate a drug.
One important factor is the drug's molecular size. The kidneys readily excrete smaller molecules below 300 Daltons (Da). On the other hand, molecules weighing between 300 and 500 Da are excreted through both urine and bile. Larger molecules above 500 Da tend to be excreted...
One important factor is the drug's molecular size. The kidneys readily excrete smaller molecules below 300 Daltons (Da). On the other hand, molecules weighing between 300 and 500 Da are excreted through both urine and bile. Larger molecules above 500 Da tend to be excreted...
601
02:26Conservation of Protein Domains Over Different Proteins
14.6K
Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
14.6K
01:22Factors Influencing Drug Absorption: Physicochemical Parameters
888
The physicochemical characteristics of drugs play a crucial role in formulating stable and bioavailable drug products. The solubility of a drug, governed by the varying pH along the GI tract and its dissociation constant (pKa), is pivotal in determining its ionization state and absorption rate. Notably, weak acids and bases remain unionized and are absorbed more rapidly.
Enhanced drug absorption can be achieved by reducing particle sizes and increasing surface areas, thereby facilitating...
Enhanced drug absorption can be achieved by reducing particle sizes and increasing surface areas, thereby facilitating...
888
01:18Membrane Domains
7.2K
The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the...
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the...
7.2K
01:29Three Developmental Domains
1.1K
Human development is typically examined across three main domains: physical, cognitive, and socio-emotional. These domains represent the significant areas of change and continuity throughout the lifespan, from infancy to late adulthood.
Physical Development
Physical processes, also known as maturation, encompass the biological changes that occur across an individual's life. These changes begin with genetic inheritance and continue through various stages, including growth in height and weight,...
Physical Development
Physical processes, also known as maturation, encompass the biological changes that occur across an individual's life. These changes begin with genetic inheritance and continue through various stages, including growth in height and weight,...
1.1K