结构洞察补充抑制:可视化C4b和SAP的C4b和SAP结合蛋白质复合体的明显结合模式
Tereza Kadavá1, Jürgen Strasser2, Maryam Marefat2
1Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, University of Utrecht, Utrecht, the Netherlands; Netherlands Proteomics Center, Utrecht, the Netherlands.
Molecular & cellular proteomics : MCP
|August 3, 2025
概括
C4b结合蛋白 (C4BP) 形成独特的类似蜘蛛的结构. 这些结构与补充蛋白C4b和血清粉样蛋白P成分 (SAP) 不同地相互作用,揭示了免疫调节的独特结合机制.
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:
- C4b结合蛋白 (C4BP) 是血清中的一个关键的先天免疫调节剂.
- 人类C4BP通过二硫化物连接的C4BPα和C4BPβ链,结合蛋白S,形成复杂的类似蜘蛛的高阶结构 (HOS).
- C4BP HOS可以与其他蛋白质组装成更大的复合体,从而影响其功能.
研究的目的:
- 从结构和组成上描述C4BP与其原生结合剂,C4b和血清粉样蛋白P成分 (SAP) 的相互作用.
- 阐明C4BP与C4b和SAP相互作用时的独特结合方式.
主要方法:
- 质量摄影仪的质量摄影仪.
- 高速原子力显微镜的高速原子力显微镜.
- 交叉连接质谱法 交叉连接质谱法
主要成果:
- 当C4BP与SAP结合时,确定了两个不同的结合模式.
- C4b与单个C4BPα腿的N端区域结合,允许多个C4b分子附着在C4BP HOS.上.
- SAP与C4BPα-C4BPβ寡合化核心结合,C4BPα腿围绕着它,参与了整个类似蜘蛛的HOS.
结论:
- C4BP对C4b和SAP表现出不同的结合策略,这对其补充抑制和其他作用至关重要.
- 了解这些独特的结合模式,可以了解C4BP功能在先天性免疫和相关疾病,如粉样化症中的结构性基础.
更多相关视频
09:30Analyzing Dynamic Protein Complexes Assembled On and Released From Biolayer Interferometry Biosensor Using Mass Spectrometry and Electron Microscopy
Published on: August 6, 2018
9.5K
10:17Creating Highly Specific Chemically Induced Protein Dimerization Systems by Stepwise Phage Selection of a Combinatorial Single-Domain Antibody Library
Published on: January 14, 2020
7.9K
相关概念视频
01:27Complement System
2.7K
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...
2.7K
01:26Antibody Actions
1.3K
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...
1.3K
02:40Ligand Binding Sites
13.2K
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
13.2K
01:23Antimicrobial Proteins
5.3K
Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
5.3K
02:34Enzymes
82.7K
Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
82.7K
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