J-域蛋白与Hsp70合作,驱动缺少RNA结合的TDP-43多相分离
Kian Hua Yeo1, Jian Hua Kong1, Qing Hao Ng1
1School of Biological Sciences, Nanyang Technological University, Singapore, Singapore.
The Journal of biological chemistry
|October 24, 2025
概括
像Sis1这样的J域蛋白 (JDP) 对于形成与疾病相关的TDP-43多相凝结物至关重要. 这个过程涉及到Sis1招募Hsp70陪伴者,突出了JDP在TDP-43分相的特异性.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 无RNA的TDP-43与与疾病相关的Hsp70伴侣形成核多相凝聚物.
- 对于TDP-43凝结物形成的机制以及J域蛋白 (JDPs) 的作用尚不清楚.
研究的目的:
- 研究JDPs在TDP-43多相冷凝形成中的作用.
- 确定联合开发计划如何为TDP-43.3的分阶段贡献.
主要方法:
- 使用酵母作为模型生物来研究TDP-43和JDP的相互作用.
- 使用缺少RNA结合的TDP-43和特定的JDP (Sis1, Ydj1) 进行了冷凝物形成的研究.
- 分析了从均凝结体到多相凝结体的结构转变.
主要成果:
- 确定Sis1,但不是Ydj1,作为TDP-43多相分离的关键因素.
- 观察到缺少RNA结合的TDP-43最初形成了Sis1丰富的冷凝物,随后招募了Hsp70.
- 证明Hsp70招募将均凝聚物转化为多相结构,需要功能J域来刺激Hsp70 ATPase活动.
结论:
- 联合开发项目在TDP-43多相冷凝的形成中发挥着至关重要的作用.
- Sis1 通过调解 Hsp70 的招募和活动,特别促进 TDP-43 的相分离.
- 结果阐明了JDP对TDP-43异常相隔离在疾病环境中的贡献.
相关概念视频
Molecular Chaperones and Protein Folding
19.6K
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...
19.6K
Energy to Drive Translocation
2.7K
Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
Generally, polypeptides are unfolded by two distinct...
Generally, polypeptides are unfolded by two distinct...
2.7K
RNA Polymerase II Accessory Proteins
10.8K
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
10.8K
RNA Polymerase II Accessory Proteins
3.8K
3.8K
Bacterial Protein Maturation
454
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...
454
Single-Strand DNA Binding Proteins
16.5K
For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
16.5K


