Spin Labeled Bovine Serum Albumin, Spin Labeled Bovine Serum Albumin Chelating Agents and Their Gadolinium Complexes. Potential Contrast Enhancing Agents for Magnetic Resonance Imaging
作者:George Sosnovsky、N. Uma Maheswara Rao、J. Lukszo、Robert C. Brasch
DOI:10.1515/znb-1986-0917
日期:1986.9.1
(BSA) was spinlabeled using the active esters 3 and 5 containing a nitroxyl radical to give the spinlabeled BSA derivatives 4 and 6. Spinlabeled C D TA , DTPA and TTHA chelating agents 10, 13 and 16 and the corresponding BSA derivatives 17, 18 and 19 and their gadolinium complexes 20, 21 and 22 were synthesized. All these BSA derivatives were evaluated as possible contrastenhancingagents for NMR
Luminescent Terbium Protein Labels for Time-Resolved Microscopy and Screening
作者:Harsha E. Rajapakse、D. Rajasekhar Reddy、Shabnam Mohandessi、Nathaniel G. Butlin、Lawrence W. Miller
DOI:10.1002/anie.200900858
日期:2009.6.22
Brilliance of terbium: Heterodimeric conjugates of trimethoprim covalently linked to sensitized terbium chelates bind to Escherichia coli dihydrofolate reductase fusion proteins with nanomolar affinity (see picture). Terbium luminescence enables sensitive and time‐resolved detection of labeledproteins in vitro and on the surface of living mammalian cells.
considerable release of Gd3+ in vitro. Gd3+ ionsreleased from 1 are avidly taken up by the K562 tumourcells to an extent corresponding to approximately 1010 Gd3+ per cell. The internalisation of toxicGd3+ ions causes a marked decrease in cell viability as assessed by Trypan blue and WST‐1 tests. On the contrary, the experiments with the more stable 2 did not show any significant cell internalisation
由维生素 B 12 (CNCbl) 组成的两个探针通过核糖 5'-OH 部分的酯化与 Gd 螯合物结合,Gd-DTPA-CNCbl ( 1 ; DTPA =二亚乙基三胺- N , N , N' , N'' , N' '-五乙酸) 和 Gd-TTHA-CNCbl ( 2 ; TTHA =三乙烯四胺-N , N , N' , N'' , N''' , N'''-六乙酸), 已被合成和表征。1的二聚体的晶体结构,通过用过量的 GdCl 3结晶获得,已经确定。与转钴胺素 II 结合和解离的动力学表明,1和2保持与维生素 B 12转运蛋白的高亲和力结合。由于 Gd 3+离子与四个氨基和五个羧酸根基团的饱和配位,配合物2的 Gd 3+释放非常稳定。酯官能团的水解发生在几个小时的时间尺度上。缺乏饱和度和酯官能团可能参与配位导致1的稳定性较低水解和在体外大量释放Gd 3+ 。从1释放的Gd 3+离子被 K562
Time-Gated Detection of Cystathionine γ-Lyase Activity and Inhibition with a Selective, Luminogenic Hydrogen Sulfide Sensor
作者:Yao Yao、Chen Kong、Liang Yin、Atul D. Jain、Kiira Ratia、Gregory R. J. Thatcher、Terry W. Moore、Tom G. Driver、Lawrence W. Miller
DOI:10.1002/chem.201604786
日期:2017.1.18
Herein, we report the design, synthesis, and characterization of a lanthanideIII complex‐basedprobe for the time‐gatedluminescencedetection of hydrogensulfide (H2S) in aqueous media. The probe's unique sensing mechanism relies on the selective reduction of azide to amine by sulfide, followed by intramolecular cyclization to form a quinolinone. The quinolinone is a sensitizer that absorbs near‐UV