申请人:Wong Chi-Huey
公开号:US20110257376A1
公开(公告)日:2011-10-20
Methods are provided for labeling cellular glycans bearing azide groups via fluorescent labeling comprising Cu(I)-catalyzed [3+2] cycloaddition of a probe comprising alkynyl group. Generation of fluorescent probes from a nonfluorescent precursor, 4-ethynyl-N-ethyl-1,8-naphthalimide, by Cu(I)-catalyzed [3+2] cycloaddition of the alkyne group of the probe to an azido-modified sugar are provided. Incorporation of azido-containing fucose analog into glycoconjugates via the fucose salvage pathway are disclosed. Fluorescent visualization of fucosylated cells by flow cytometry of cells treated with 6-azidofucose labeled with click-activated fluorogenic probe or biotinylated alkyne is disclosed. Visualization of intracellular location of fucosylated glycoconjugates by fluorescence microscopy are disclosed.
提供了一种通过荧光标记的方法来标记带有偶氮基团的细胞糖基,包括利用含炔基的探针进行铜(I)催化的[3+2]环加成。通过将非荧光前体4-乙炔基-N-乙基-1,8-萘酰亚胺经铜(I)催化的[3+2]环加成,将探针的炔基与偶氮修饰糖的偶氮基团结合生成荧光探针。通过富马醇拯救途径将含偶氮基的富马醇类似物纳入糖蛋白中。通过流式细胞术将经6-偶氮基富马醇标记的细胞与点击活化的荧光探针或生物素化炔烃处理,实现对富马基细胞的荧光可视化。通过荧光显微镜揭示富马基糖蛋白的胞内位置。