new lanthanidetag was designed for site-specific labeling of proteins with paramagneticlanthanide ions. The tag, 4-mercaptomethyl-dipicolinic acid, binds lanthanide ions with nanomolar affinity, is readily attached to proteins via a disulfide bond, and avoids the problems of diastereomer formation associated with most of the conventional lanthanidetags. The high lanthanide affinity of the tag opens
设计了一种新的镧系元素标签,用于用顺磁性镧系元素离子对蛋白质进行位点特异性标记。标签,4-巯基甲基-吡啶二羧酸,以纳摩尔亲和力结合镧系离子,通过二硫键很容易连接到蛋白质上,并避免了与大多数常规镧系元素标签相关的非对映异构体形成问题。标签的高镧系元素亲和力开启了在包含顺磁性和反磁性镧系元素混合物的单个样品中测量残余偶极耦合的可能性。以大肠杆菌精氨酸阻遏物的 DNA 结合域为例,证明标签允许通过蛋白质的羧基对镧系元素的额外配位将镧系元素离子固定在蛋白质附近。镧系元素离子的接近促进了磁化率各向异性张量的准确测定。此外,标签的小尺寸使其非常适合分子间相互作用的研究。
Lanthanide-based hydrogels with adjustable luminescent properties synthesized by thiol-Michael addition
作者:Qing-Feng Li、Shaowen Chu、Erqing Li、Meng Li、Jin-Tao Wang、Zhenling Wang
DOI:10.1016/j.dyepig.2019.108091
日期:2020.3
Luminescent hydrogels have been widely used in many fields because of their excellent optical properties. Although there are many mature preparation methodologies, the development of new luminescent hydrogels with adjustable fluorescence properties and good mechanical properties is still an urgent need to explore. In this paper, we describe a simple and effective way to synthesize highly luminescent