定义STING-胆固醇与化学蛋白质组学的相互作用
Ian Ford1,2, Miranda Villanueva3,2, Min Sub Lee1,4
1Department of Microbiology, Immunology, and Molecular Genetics, Biomedical Research Sciences Building, 615 Charles E. Young Drive, University of California Los Angeles CA 90095 USA SBensinger@mednet.ucla.edu.
RSC chemical biology
|August 1, 2025
概括
细胞胆固醇代谢调节干扰素基因刺激器 (STING) 途径. 固醇合成影响着STING活动和局部化,为自身炎症性疾病揭示了新的治疗点.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 细胞的新陈代谢
背景情况:
- 干扰素基因刺激器 (STING) 是一个重要的细胞内受体,用于检测细胞质DNA和循环二核酸.
- 刺激调节对于预防过度的I型干扰素反应和自身炎症状况至关重要.
- 胆固醇代谢在调节STING活动中的作用越来越被认可,但尚未完全理解.
研究的目的:
- 阐明链接胆固醇平衡和STING活动的分子机制.
- 为了研究胆固醇合成调节对STING功能的影响.
- 为了确定固醇和STING之间的直接相互作用.
主要方法:
- 基因操纵 (功能获取和丧失系统),包括SCAP-SREBP2和Srebf2删除.
- 基于活动的蛋白质分析,使用固醇模拟探针.
- 共同净化试验和亚细胞局部化研究.
主要成果:
- 增加SCAP-SREBP2介导的胆固醇合成对STING活性的影响很小.
- 基因删除Srebf2增强了基底和带诱导的I型干扰素反应.
- 观察到STING与胆固醇结合的直接证据;VDAC1被确定为一种对胆固醇敏感的STING相互作用蛋白. STING局部化响应了细胞固醇含量变化.
结论:
- STING可以独立于SCAP-SREBP2通路运行.
- 细胞内膜网中的固醇合成会影响STING活动.
- 这些发现支持一个模型,其中胆固醇识别氨基酸共识 (CARC) 动机调解胆固醇依赖的ER中的STING保留.
相关概念视频
Noncovalent Attractions in Biomolecules
27.9K
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
27.9K
Ligand Binding Sites
11.8K
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...
11.8K
Protein-protein Interfaces
12.5K
Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
12.5K
Protein Networks
3.7K
An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
3.7K
Radical Reactivity: Steric Effects
1.6K
The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic...
Along with electronic...
1.6K


