在Hsp90功能中,ATP起着结构性作用
Michael Reidy1, Daniel C Masison2
1Laboratory of Biochemistry and Genetics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA. michael.reidy@nih.gov.
Nature communications
|July 21, 2025
概括
氨酸三酸盐 (ATP) 的结合,而不是水解,对于Hsp90的护送功能至关重要. ATP充当结构链接器,通过与氨酸R380.的相互作用稳定Hsp90.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 热冲击蛋白90 (Hsp90) 是一个关键的分子伴侣.
- Hsp90利用腺三酸盐 (ATP) 进行其功能.
- 在Hsp90的机制中,ATP结合与水解的确切作用尚不清楚.
研究的目的:
- 阐明ATP在Hsp90伴侣功能中的结构性作用.
- 为了研究ATP与保存残留物之间的相互作用,特别是氨酸R380.
- 为了了解ATP结合和水解如何影响Hsp90的动力学.
主要方法:
- 这项研究可能涉及结构生物学技术 (例如,X射线结晶学,冷EM) 以可视化Hsp90-ATP复合体.
- 生物化学测试可能用于评估ATP结合和水解对Hsp90活性的影响.
- 针对R380的突变性研究可能被用来测试其功能意义.
主要成果:
- 研究结果表明,ATP结合,而不是水解,对Hsp90的结构完整性和功能至关重要.
- 酸的ATP重置与氨酸R380相互作用,稳定了关闭的伴侣.
- ATP 起到结构链接的作用,将 Hsp90 的 N 和 M 域连接起来,水解有助于紧固件重新开放.
结论:
- 在Hsp90功能中ATP的重要作用是结构性的,用于稳定闭合形状.
- 氨酸R380通过与ATP相互作用而充当"氨酸指"的功能,这表明核酸可以成为NTPase家族中的结构元素.
- 这项工作为Hsp90的机制以及核酸在蛋白质 - 配体相互作用中的更广泛作用提供了新的见解.
相关概念视频
Energy to Drive Translocation
2.1K
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...
2.1K
ATP Synthase: Structure
13.1K
ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
13.1K
Molecular Chaperones and Protein Folding
18.5K
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...
18.5K
Mechanical Protein Functions
5.1K
Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.
5.1K
Structural Protein Function
2.8K
2.8K
Allosteric Proteins-ATCase
5.9K
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
5.9K


