Site-Specific Bioconjugation of an Organometallic Electron Mediator to an Enzyme with Retained Photocatalytic Cofactor Regenerating Capacity and Enzymatic Activity
Artificial photosynthesis dendrimers integrating light-harvesting, electron delivery and hydrogen production
作者:Zhiqing Xun、Tianjun Yu、Yi Zeng、Jinping Chen、Xiaohui Zhang、Guoqiang Yang、Yi Li
DOI:10.1039/c5ta02565f
日期:——
A series of artificialphotosynthesis complexes, Gn–Ir–Hy (n = 1–4), were constructed by attaching iridium complexes and [Fe–Fe]-hydrogenase mimic to the periphery and core, respectively, of poly(aryl ether) dendrimers of different generations. The iridium complexes act as the light-harvesting antennae and the hydrogenase mimic core is the catalytic center. Light-harvesting, photoinduced electron-transfer
一系列人工光合作用配合物G n –Ir–Hy(n= 1-4),是通过将铱配合物和[Fe-Fe]-加氢酶模拟物分别连接到不同世代的聚(芳基醚)树状聚合物的外围和核心而构建的。铱配合物充当光收集触角,氢化酶模拟核心是催化中心。在树状光合作用模拟中,使用三乙胺作为牺牲电子供体,实现了光收集,光诱导电子转移和氢光化学生产。随着树状催化剂的产生,催化活性得到增强,第四代的周转次数比第一代的周转次数高将近4倍。外围触角不仅收获光子,而且还充当光化学生产的电子储能器,它促进了催化过程,并增强了树状骨架的采光和保护作用。因此,通过这种合理的设计,可以提高具有完整的光收集和催化功能的有效的人造光合作用系统。
Unlocking the potential of iridium and ruthenium arene complexes as anti-tumor and anti-metastasis chemotherapeutic agents
作者:Mengdi Lv、Xiaoting Qian、Shijie Li、Jie Gong、Qun Wang、Yong Qian、Zhi Su、Xuling Xue、Hong-Ke Liu
DOI:10.1016/j.jinorgbio.2022.112057
日期:2023.1
uptake and the mitochondrial accumulation of metal-arene complexes, which caused mitochondrial membrane potential damage, oxidative phosphorylation, ATP depletion and autophagy. Besides, OA-Ir and OA-Ru displayed excellent activity to disintegrate the 3D multicellular tumor spheroids, showing potential for the treatment of solid tumors. This work provides a new way for developing novel metal-based complexes
设计用于抗肿瘤和抗转移应用的新型多功能金属基化学治疗剂是一项重大挑战。以无毒的 Ir - N 3或 Ru - N 3为原料,通过 CuAAC(铜催化叠氮化物-炔烃环加成)反应合成了两种配合物(OA-Ir和OA-Ru )种和低毒炔基前体OA-炔烃,并表现出令人满意的抗肿瘤和抗转移药理作用。与通过线粒体诱导的自噬途径的前体相比,齐墩果酸 (OA) 和金属芳烃物质的结合显着增强了 A2780 细胞的细胞毒性。此外,这两种复合物可以通过破坏肌动蛋白动力学和下调 MMP2/MMP9 蛋白来抑制细胞转移和侵袭。两种前体的结合提高了亲脂性和生物相容性,同时增强了金属-芳烃复合物的细胞摄取和线粒体积累,导致线粒体膜电位损伤、氧化磷酸化、ATP 耗竭和自噬。此外,OA-Ir和OA-Ru显示出分解 3D 多细胞肿瘤球体的出色活性,显示出治疗实体瘤的潜力。这项工作为通过 CuAAC 反应开发新型金属基配合物同时抑制肿瘤增殖和转移提供了一条新途径。
The self-assembly of [60]fullerene-substituted 2,2′-bipyridine on the surface of Au(111) and Au nanoparticles
The cycloaddition reaction of the azide of 4,4′-dimethyl-2,2′-bipyridine to [60]fullerene was used to synthesize a novel [60]fullerenederivative, which was employed to self-assemble on the surface of Au(111) and gold nanoparticles. Scanning tunneling microscopy results show that the [60]fullerenederivative forms a self-assembled monolayer on the Au(111) surface spontaneously. Transmission electron