Submitted on February 21, 2007
Revised on March 26, 2007
Accepted on March 26, 2007
N-Azidoacetylmannosamine mediated chemical tagging of gangliosides
Anton P. Bussink, Paul F. van Swieten, Karen Ghauharali, Saskia Scheij, Marco van Eijk, Tom Wennekes, Gijs A. van der Marel, Rolf G. Boot, Johannes M.F.G. Aerts, and Herman S. Overkleeft
Medical Biochemistry, Academic Medical Centre, Amsterdam, Noord-Holland 1105 AZ
Corresponding Author: j.m.aerts{at}amc.uva.nl
Peracetylated N-
-azidoacetylmannosamine is metabolized by cells to CMP-azidosialic acid. It has earlier been demonstrated that in this way azidosialic acid-containing glycoproteins are formed that can be labeled on the cell surface by a modified Staudinger ligation. We here firstly demonstrate that the same procedure also results in formation of azidosialic acid-containing gangliosides. Deoxymannojirimycin, an inhibitor of N-glycan processing in proteins, lowers by about 25% the total cell surface labeling in Jurkat cells. Inhibition of ganglioside biosynthesis with N-(adamantanemethyloxy)pentyl-deoxynojirimycin reduces by about 75% cell surface labeling. In conclusion, exposure of cells to peracetylated N-
-azidoacetylmannosamine allows in vivo chemical tagging of gangliosides.