Abstract
Application of the negative mode electrospray ionization-quadrupole time-of-flight mass spectrometry (ESI QTOF) tandem MS for determination of substitution patterns by sialic acid and/or fucose and extention by additional LacNAc disaccharide units in single branches of multiantennary N-glycans from biological samples is described. Fragmentation patterns which can be obtained by low energy collision-induced dissociation (CID) using the QTOF instrument include cleavage ions, diagnostic for determination of antennarity and for specific structural features of single antennae. Systematic fragmentation studies in the negative ion mode were focussed toward formation of the D diagnostic ion relevant for assignment of 3- and 6-antennae in complex N-glycans carrying three and four antennae in combination with epitope-relevant B- and C-type ions. For validation of this approach ESI QTOF fragmentation of the permethylated analogues was carried out in the positive ion mode. Using this strategy, products of in vitro glycosylation reactions were investigated in order to clarify some general aspects of N-glycan acceptor specificity during biosynthesis. α1-3fucosylation using GDP-fucose along with a soluble form of the recombinant human α1-3fucosyltransferase VI was carried out on tri- and tetraantennary precursors to test structural requirements for formation of Lex versus sLex motifs.
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Sagi, D., Peter-Katalinic, J., Conradt, H.S. et al. Sequencing of tri- and tetraantennary N-glycans containing sialic acid by negative mode ESI QTOF tandem MS. J. Am. Soc. Spectrom. 13, 1138–1148 (2002). https://doi.org/10.1016/S1044-0305(02)00412-9
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DOI: https://doi.org/10.1016/S1044-0305(02)00412-9