使用生物素-抗生物素蛋白作为连接体的混合二氧化钛结构中的组装与电荷转移

Assembly and charge transfer in hybrid TiO(2) architectures using biotin-avidin as a connector.

作者信息

Dimitrijevic Nada M, Saponjic Zoran V, Rabatic Bryan M, Rajh Tijana

机构信息

Chemistry Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.

出版信息

J Am Chem Soc. 2005 Feb 9;127(5):1344-5. doi: 10.1021/ja0458118.

DOI:10.1021/ja0458118

PMID:15686345

Abstract

Exploiting the presence of undercoordinated surface Ti atoms at the tips of TiO2 nanorods and the dopamine selectivity for these Ti surface states, biotin was conjugated to TiO2 nanocrystallites using dopamine as a bridging linker. Using abiotin-avidin complex as a connector the "tip-to-tip" assembly of 400 nm elongated TiO2 rods was obtained. The photoexcitation of avidin-TiO2 hybrids resulted in the transfer of holes from nanocrystallites to protein and consequent oxidation of avidin, most probably at tyrosine 33.

摘要

利用二氧化钛纳米棒尖端表面钛原子配位不足的情况以及多巴胺对这些钛表面态的选择性，以多巴胺作为桥连连接体，将生物素与二氧化钛纳米微晶共轭。使用生物素-抗生物素蛋白复合物作为连接器，获得了400纳米长的二氧化钛棒的“尖端对尖端”组装体。抗生物素蛋白-二氧化钛杂化物的光激发导致空穴从纳米微晶转移到蛋白质上，进而使抗生物素蛋白氧化，最有可能发生在酪氨酸33处。