作者:Geoffroy P.P. Gential、Nataschja I. Ho、Fabrizio Chiodo、Nico Meeuwenoord、Ferry Ossendorp、Herman S. Overkleeft、Gijs A. van der Marel、Dmitri V. Filippov
DOI:10.1016/j.bmcl.2016.05.094
日期:2016.8
Chirally pure R- and S-epimers of TLR2 ligand Pam3CysSK4 were prepared and separately conjugated to an OVA model epitope, in which lysine was replaced by azidonorleucine. The azide function in the conjugate permitted labelling with different fluorophores by use of strain-promoted 3+2 cycloaddition. The R-epimer of the labelled conjugates induced TLR2-dependent DC maturation, while S-epimer proved to
制备了TLR2配体Pam 3 CysSK 4的手性纯R-和S-受体,并将其分别偶联至OVA模型表位,其中赖氨酸被叠氮亮氨酸取代。通过使用应变促进的3 + 2环加成,共轭物中的叠氮化物功能允许用不同的荧光团标记。标记的结合物的R-受体诱导TLR2依赖的DC成熟,而S-受体被证明是无活性的。结合Pam 3 CysSK 4的亲脂性具有荧光团的配体以不可预测的方式影响所得缀合物的溶解度,并且仅用Cy-5标记的缀合物适用于共聚焦荧光显微镜实验。结果表明,Cy-5标记的脂肽的两个差向异构体均被很好地内化,表明不依赖TLR2的细胞摄取。提出的结果证明了应变促进的叠氮化物-炔烃环加成在高度亲脂性脂肽的标记中的有用性,而不会干扰这些缀合物在激活TLR-2方面的体外活性。