使用Sortase A构建一个循环正规三角形的细胞染色体c555与一个中央孔的三分机
Gissi Novientri1, Kodai Fujiwara1, Tsuyoshi Mashima1,2
1Division of Materials Science, Graduate School of Science and Technology, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara, Japan.
Chemistry (Weinheim an der Bergstrasse, Germany)
|March 27, 2025
概括
研究人员使用酶介导结合 (SML) 稳定了蛋白质三角结构,以创建循环分子. 这种方法产生了强大的,纳米孔状超分子组件,具有增强的热稳定性.
科学领域:
- 生物化学 生物化学
- 材料科学 材料科学 材料科学
- 结构生物学 结构生物学
背景情况:
- 蛋白质构建块的精确排列对于构建功能性超分子至关重要.
- 之前的工作从Aquifex aeolicus cytochrome c555中创建了一个正三角三元体 (cp-c555) 3,但由于单体解离,它显示出不稳定性.
研究的目的:
- 为了稳定正三角形蛋白质结构.
- 为了设计一个循环,纳米孔状超分子组件,增强稳定性.
主要方法:
- 索尔塔酶介导结合 (SML) 用于将三个插入α-螺旋体的循环变剂 (cp-c555) 分子连接成一个循环结构.
- 通过比较6个cp-c555变异来优化SML条件,识别高效的N端 (GGG) 和C端 (LPETG) 序列.
- 在大肠杆菌中设计并表达了一种二度中间体 (OP-(c555) 3),以便通过SML进行后续循环.
主要成果:
- 成功构建了一个由三个α-螺旋结合的cyt c555分子组成的循环正规三角形,命名为CL-(c555)3.5.
- 与其线性或非周期性对应物相比,CL- ((c555) 3) 的热稳定性显著更高.
- 高速原子力显微镜和X射线晶体学证实了循环结构,并揭示了一个具有中心孔的纳米孔状超分子组件.
结论:
- 索尔塔酶介导结合是一种有效的方法,用于创建稳定,循环蛋白超分子组件.
- 设计的循环分子CL-{c555) 3展示了一种通过精确的蛋白质工程来构建纳米孔状材料的新方法.
相关概念视频
01:43Electron Transport Chain: Complex III and IV
During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
01:18Aromatic Hydrocarbon Cations: Structural Overview
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...
Removing one hydrogen from the intervening CH2 group with both...