W. Metelmann et al., Gangliosides from human granulocytes: A nano-ESI QTOF mass spectrometry fucosylation study of low abundance species in complex mixtures, J AM SOC M, 12(8), 2001, pp. 964-973
Citations number
24
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
Nano-ESI QTOF MS was used for sensitive mapping and sequencing of single mo
lecular species in complex ganglioside mixtures obtained from human granulo
cytes, where the fucosylated carbohydrate chains of granulocyte ganglioside
s carry sLe(x) and VIM-2 epitopes postulated to interact with E-selectin of
the blood vessel wall in the early phase of the inflammation process. Func
tionally relevant components are expressed only at a low level, but using t
he negative ion detection it is possible to trace and identify such species
, which were not detectable even by TLC. Advantage of the low-energy CID fr
agmentation for low abundance components of the complex ganglioside mixture
s in the negative ion mode is to produce clear-cut series of fragment ions
for sequencing. Fucosylation analysis carried out for each molecular specie
s by MS/MS permits the clear distinction between sLe(x) and VIM-2 epitope.
VIM-2 epitope was expressed in all species with a longer sugar core, while
in the short oligosaccharide chain with a sLe(x) only, using biological mat
erial at a mid-femtomol level detection. (C) 2001 American Society for Mass
Spectrometry.