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The Photocatalyzed Thiol-ene reaction: A New Tag to Yield Fast, Selective and reversible Paramagnetic Tagging of Proteins.
ChemPhysChem ( IF 2.3 ) Pub Date : 2020-03-19 , DOI: 10.1002/cphc.202000071
Maxime Denis 1, 2 , Charlotte Softley 3, 4 , Stefano Giuntini 2, 5 , Matteo Gentili 1 , Enrico Ravera 5 , Giacomo Parigi 2, 5 , Marco Fragai 2, 5 , Grzegorz Popowicz 4 , Michael Sattler 3, 4 , Claudio Luchinat 2, 5 , Linda Cerofolini 5 , Cristina Nativi 2
Affiliation  

Paramagnetic restraints have been used in biomolecular NMR for the last three decades to elucidate and refine biomolecular structures, but also to characterize protein‐ligand interactions. A common technique to generate such restraints in proteins, which do not naturally contain a (paramagnetic) metal, consists in the attachment to the protein of a lanthanide‐binding‐tag (LBT). In order to design such LBTs, it is important to consider the efficiency and stability of the conjugation, the geometry of the complex (conformational exchanges and coordination) and the chemical inertness of the ligand. Here we describe a photo‐catalyzed thiol‐ene reaction for the cysteine‐selective paramagnetic tagging of proteins. As a model, we designed an LBT with a vinyl‐pyridine moiety which was used to attach our tag to the protein GB1 in fast and irreversible fashion. Our tag T1 yields magnetic susceptibility tensors of significant size with different lanthanides and has been characterized using NMR and relaxometry measurements.

中文翻译:

光催化硫醇-烯反应:一种产生快速、选择性和可逆顺磁性蛋白质标记的新标签。

过去三十年来,顺磁约束一直用于生物分子核磁共振,以阐明和完善生物分子结构,同时也用于表征蛋白质-配体相互作用。在天然不含(顺磁性)金属的蛋白质中产生这种限制的常用技术是将镧系元素结合标签(LBT)附着到蛋白质上。为了设计此类LBT,重要的是要考虑缀合的效率和稳定性、复合物的几何形状(构象交换和配位)以及配体的化学惰性。在这里,我们描述了用于蛋白质半胱氨酸选择性顺磁标记的光催化硫醇-烯反应。作为模型,我们设计了带有乙烯基吡啶部分的 LBT,用于以快速且不可逆的方式将我们的标签附着到蛋白质 GB1 上。我们的标签T1产生具有不同镧系元素的显着尺寸的磁化率张量,并使用 NMR 和弛豫测量进行了表征。
更新日期:2020-03-19
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