该Hsp40辅助组DNAJC7调节多重胺聚合,并对多重糖氨酸聚合表现出上下文依赖的影响
Biswarathan Ramani1, Kean Ehsani1, Martin Kampmann2
1Department of Pathology, University of California, San Francisco, San Francisco, CA, USA.
The Journal of biological chemistry
|February 18, 2026
概括
研究人员开发了新的细胞模型来研究多重胺 (polyQ) 和多重甘油 (polyG) 疾病中的蛋白质聚合. 鉴定出Hsp40辅助组DNAJC7是聚Q聚合的关键抑制剂,也影响着聚G聚合.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 蛋白质编码核酸重复扩张疾病如多重胺 (polyQ) 和多重甘油 (polyG) 与错误折叠,聚合蛋白有关.
- 在这些条件下,分子陪伴剂正在被研究其抑制疾病表型的潜力.
研究的目的:
- 建立可扩展的基于细胞的模型,用于系统地评估多Q和多G疾病中蛋白质聚合的遗传修饰剂.
- 确定新型的分子伴侣和共同伴侣,调节疾病相关蛋白质的聚合.
主要方法:
- 开发基于Förster共振能量转移 (FRET) 的记者系统,以模拟人体细胞中的多Q和多G聚合.
- 高通量CRISPR干扰 (CRISPRi) 屏幕针对所有已知的分子伴侣.
- 对伴侣相互作用和对蛋白质聚合的影响的分析.
主要成果:
- 在CRISPRi屏幕中,发现了Hsp70护卫剂和Hsp40辅助护卫剂作为多Q聚合的修饰剂.
- DNAJC7,Hsp40的共同主管,被确定为一种新且强大的多Q聚合抑制剂.
- 虽然DNAJC7在敲击时没有显著影响polyG聚合,但其过度表达减少了polyQ和polyG聚合,并与聚合物共定位.
结论:
- 建立了新的可诱导,可扩展的细胞模型来研究polyQ和polyG聚合.
- 扩大了DNAJC7在调节疾病相关蛋白质折叠和聚合方面的已知作用.
- 突出了在polyQ与polyG聚合途径中的差异性伴侣参与.
相关概念视频
Molecular Chaperones and Protein Folding
20.0K
The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
The...
20.0K
Molecular Chaperones and Protein Folding
15.1K
15.1K
Bacterial Protein Maturation
603
Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
603
Protein Complex Assembly
16.9K
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
16.9K
Covalently Linked Protein Regulators
9.7K
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
These groups modify specific amino acids in a protein....
9.7K
Protein Folding
11.7K
Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
11.7K


