ポリメリックアンタゴニストと変異によって調節される液体-液体相分離後の細胞プリオンタンパク質の構成変化
Yangyi Liu1,2, Marcus D Tuttle1, Mikhail A Kostylev2
1Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06511, United States.
Journal of the American Chemical Society
|September 26, 2024
まとめ
プリオンタンパク質 (PrPC) の液体-液体相分離 (LLPS) には成熟プロセスが含まれています. この形状の変化は 変異とPSCMAによって加速され 神経退化を引き起こす可能性があります
科学分野:
- 生物化学
- 神経科学
- 分子生物学
背景:
- 本質的に乱れたタンパク質の液体-液体相分離 (LLPS) は神経変性疾患と関連しています.
- LLPSが神経変性に寄与する正確なメカニズムは不明です.
- 細胞のプリオンタンパク質 (PrPC) は神経変性疾患に関与している.
研究 の 目的:
- LLPS後のPrPCの成熟過程を調査する.
- PrPC LLPSと成熟における突然変異とポリステルネスルフォニック酸-コマレイン酸 (PSCMA) の調節作用を探求する.
- LLPS後の神経変性における PrPCの潜在的役割を解明する.
主な方法:
- PSCMAを用いたPrPCの液相分離を誘導する.
- 構成状態を検出するための核磁気共鳴 (NMR) スペクトロスコーピー.
- PrPCの成熟運動と分子動態の分析
主要な成果:
- PSCMAは,PrPCのリエントラントLLPSを誘導し,その飽和濃度 (Csat) を100倍に減らす.
- PrPCは,誘導方法に関係なく,制限された分子運動を持つより固体のような状態に移行する成熟プロセスを経てます.
- プリオン病に関連するE200K変異はPrPCの成熟を加速する.
- PSCMA誘発のLLPSは中間の形状状態を安定させ,最終的なβシート豊富な状態は条件によって一貫している.
結論:
- PrPCはLLPS後の構成成熟を経て,より硬い状態に移行する.
- このLLPS後の形状の変化と動態の変化は,LLPS誘発の神経変異の潜在的なメカニズムを表しています.
- PSCMAはPrPCとLLPSの成熟を調節し,プリオンおよび関連疾患の治療戦略の洞察を提供します.
関連する概念動画
Amyloid Fibrils
9.3K
Amyloid fibrils are aggregates of misfolded proteins. Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
9.3K
Protein Folding
7.8K
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...
7.8K
Molecular Chaperones and Protein Folding
17.8K
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...
17.8K
Mutations
81.0K
Overview
81.0K
Covalently Linked Protein Regulators
6.8K
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....
6.8K
Regulation of Nuclear Protein Sorting
2.4K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
2.4K


