A Second-Generation Photocage for Zn2+ Inspired by TPEN: Characterization and Insight into the Uncaging Quantum Yields of ZinCleav Chelators
作者:H. M. Dhammika Bandara、Timothy P. Walsh、Shawn C. Burdette
DOI:10.1002/chem.201001982
日期:2011.3.28
ZinCleav‐2 photocage is ∼108. A large ΔKd is required to significantly perturb free metal ion concentrations in biological assays. The quantum yield of photolysis of apo ZinCleav‐2 and the [Zn(ZinCleav‐2)]2+ complex are 4.7 and 2.3 %, respectively, as determined by HPLC analysis. Proof of concept Zn2+ release upon photolysis of [Zn(ZinCleav‐2)]2+ was demonstrated using the fluorescent sensor Zinpyr‐1, and
光笼已被用来阐明各种小分子和Ca 2+的生物学功能; 但是,几乎没有其他金属离子可用的光笼。ZinCleav-2(1-(4,5-二甲氧基-2-硝基苯基)-N,N,N',N'-四吡啶--2-基甲基乙烷-1,2-二胺)是第二代光笼Zn 2+在光诱导的螯合配体分叉后释放出金属离子。ZinCleav-2的结构受到TPEN(N,N,N',N'-四(2-吡啶基甲基)乙二胺),由于其高结合亲和力,通常用于螯合细胞中的金属离子。TPEN骨架光解后,包含2-硝基苄基生色团导致形成两个结合较弱的二-(2-吡啶甲基)胺(DPA)片段。所需的配体是通过改良的方法制备的,该方法用于访问ZinCleav-1(1-(4,5-二甲氧基-2-硝基苯基)-N,N'-二甲基-N,N'-双吡啶-2-基甲基-乙烷1,2-二胺)。ZinCleav-2的条件离解常数(K d)为0.9 f M,这是通过基于喹啉的荧光传感器对Zn 2+的竞争滴定法测得的。这DPA光产物的Zn