螺旋介导的TDP-43 C终端域多元化的结构细节
Azamat Rizuan1, Jayakrishna Shenoy2, Priyesh Mohanty1
1Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843.
bioRxiv : the preprint server for biology
|July 15, 2024
概括
研究人员发现了TAR DNA结合蛋白-43 (TDP-43) 保护区域的螺旋结构,这对其功能至关重要,并且与像ALS这样的神经退行性疾病有关. 这一发现澄清了TDP-43的情况.
科学领域:
- 神经科学是一个神经科学.
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- TAR DNA结合蛋白-43 (TDP-43) C端域 (CTD) 本质上是无序的,在神经退行性疾病中形成包容.
- 在TDP-43 CTD中,一个保留区域 (CR) 介导了螺旋-螺旋接触,这对寡合化和功能至关重要,但受到ALS突变的影响.
- 对CR组件的结构洞察力和ALS变体对TDP-43相隔离和功能的影响是有限的.
研究的目的:
- 阐明TDP-43 CR螺旋式寡合化的结构基础.
- 了解特定残留物在CR组装,相分离和TDP-43功能中的作用.
- 为TDP-43聚合的初始阶段提供一个结构模型.
主要方法:
- 综合性结构生物学方法结合了生物物理实验 (NMR) 和生物化学测试 (氨酸扫描突变发生).
- 使用AlphaFold2-Multimer (AF2-Multimer) 的计算建模.
- 原子分子动力学 (AAMD) 模拟.
主要成果:
- 在生理条件下,TDP-43 CR存在于阿尔法螺旋状态.
- 在CR中的疏水性残留物对于组装,相位分离和核保留至关重要,而极性残留物则会抑制这些过程.
- AF2-Multimer和AAMD模拟显示了动态的,寡合的TDP-43组件,由富含 metionin的核心和Trp/Leu对稳定.
结论:
- 这项研究提供了TDP-43 CR螺旋寡合化的新型结构模型.
- 这些发现有助于进一步了解TDP-43的生理功能及其转化为病原性聚合物.
- 鉴定到的结构特征提供了对TDP-43相关神经退行症背后的机制的见解.
更多相关视频
相关概念视频
Protein Complex Assembly
10.6K
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...
10.6K
Protein Folding
117.8K
Overview
117.8K
Protein and Protein Structure
79.4K
Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme...
A protein's shape is critical to its function. For example, an enzyme...
79.4K
Protein Organization
137.2K
Overview
137.2K
Tail-anchoring of Proteins in the ER Membrane
3.1K
Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...
3.1K
Multi-pass Transmembrane Proteins and β-barrels
5.3K
In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as...
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as...
5.3K


