在De Novo设计的桶中进行封闭和催化
在PubMed上查看摘要
概括
此摘要是机器生成的。研究人员设计了新的α-螺旋桶 (αHB) 组件来结合多个小分子. 这些蛋白质结构起到分子瓶的作用,使染料接近和光聚变等受控功能成为可能.
科学领域
- 超分子化学
- 蛋白质工程
- 生物物理化学
背景情况
- 新的蛋白质设计使得可预测的组合和蛋白质结构产生.
- 将小分子结合和催化等功能整合到设计的蛋白质中是一个关键挑战.
- 控制多个小分子的结合和方向对于指导化学反应至关重要.
研究的目的
- 在水溶液中设计,描述和应用小分子:三元复合物.
- 使用α-螺旋桶 (αHB) 组件作为可适应的分子支架.
- 在设计的蛋白质结构中证明多个小分子的受控结合.
主要方法
- 设计和制造具有可调节通道特性的α-螺旋式组件.
- 使用弗斯特共振能量转移 (FRET) 来监测结合的分子的接近.
- 采用特定的有机染料 (1,6-二-1,3,5-六烯,尼罗河红色) 和炭烯作为模型小分子.
主要成果
- 证明特定的αHBs可以使用FRET共定位两个不同的有机染料 (1,6-二-1,3,5-六烯和尼罗河红色).
- 表明两种烯分子可以安置在αHB中以促进光二分化.
- 观察到,并非所有三元复合物都能产生有效的能量转移或光二分化,这表明设计依赖于控制.
结论
- 阿尔法螺旋桶 (αHB) 组件可以作为可编程的分子瓶来容纳多个小分子.
- αHBs的设计允许对小分子的结合和接近进行可预测的控制.
- 这项工作为开发用于催化和其他需要精确分子组织的基于蛋白质的新系统铺平了道路.
相关概念视频
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...
A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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...
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...
Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence....

