کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1210283 | 965369 | 2006 | 11 صفحه PDF | دانلود رایگان |
We have previously described the site-specific glycosylation analysis of rat brain Thy-1 by LC/multistage tandem mass spectrometry (MSn) using proteinase-digested Thy-1. In the present study, detailed structures of oligosaccharides released from Thy-1 were elucidated by mass spectrometric oligosaccharide profiling using LC/MS with a graphitized carbon column (GCC–LC/MS). First, using model oligosaccharides, we improved the oligosaccharide profiling by ion trap mass spectrometry (IT–MS) coupled with Fourier transform ion cyclotron resonance mass spectrometry (FT–ICR–MS). Sequential scanning of a full MS1 scan with FT–ICR–MS followed by data-dependent MSn with IT–MS in positive ion mode, and a subsequent full MS1 scan with FT–ICR–MS followed by data-dependent MSn with IT–MS in negative ion mode enabled the monosaccharide composition analysis as well as profiling and sequencing of both neutral and acidic oligosaccharides in a single analysis. The improved oligosaccharide profiling was applied to elucidation of N-linked oligosaccharides from Thy-1 isolated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. It was demonstrated that Thy-1 possesses a significant variety of N-linked oligosaccharides, including Lewis a/x, Lewis b/y, and disialylated structure as a partial structure. Our method could be applicable to analysis of a small abundance of glycoproteins, and could become a powerful tool for glycoproteomics.
Journal: Journal of Chromatography A - Volume 1103, Issue 2, 27 January 2006, Pages 296–306