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Sulphated mucin oligosaccharides from porcine small intestine analysed by four-sector tandem mass spectrometry.

Journal article
Authors Niclas G. Karlsson
Hasse Karlsson
Gunnar C. Hansson
Published in Journal of mass spectrometry : JMS
Volume 31
Issue 5
Pages 560-72
ISSN 1076-5174
Publication year 1996
Published at Institute of Medical Biochemistry
Pages 560-72
Language en
Links dx.doi.org/10.1002/(SICI)1096-9888(...
Keywords Acetylation, Animals, Carbohydrate Sequence, Intestine, Small, chemistry, Molecular Sequence Data, Mucins, chemistry, Oligosaccharides, chemistry, Spectrometry, Mass, Fast Atom Bombardment, Sulfates, chemistry, Swine, Terminology as Topic
Subject categories Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy)

Abstract

The fraction of sulphated oligosaccharide alditols isolated from mucin glycopeptides of porcine small intestine 'insoluble' mucin complex was analysed by negative-ion fast atom bombardment (FAB) tandem mass spectrometry. Collision-induced dissociation (CID) tandem mass spectra of native and peracetylated species were compared with standards of sulphated monosaccharides. The tandem mass spectra revealed structural information of the carbohydrate sequence and sulphate position. Negative-ion FAB ionization of the peracetylated sulphated oligo-saccharide alditols was at least three times more sensitive than that of the native sulphated oligosaccharide alditols, as revealed by comparing the signal-to-noise ratios, and allowed the detection of eleven compared with six pseudo-molecular ions. Fourteen structures were determined from the CID tandem mass spectra obtained. The main sulphation site was C-6 of an N-acetylglucosamine 6-linked to the N-acetylgalactosaminitol. C-3 of the N-acetylgalactosaminitol could be unsubstituted or extended with a series of up to three monosaccharide residues including blood group H determinants and blood group A determinants. Also, the sulphated N-acetylglucosamine could be further extended. The most abundant structure was a monosulphated trisaccharide with the sequence Gal-->3(SO3-->6GlcNAc-->6)GalNAcol. The sulphation at C-6 of N-acetylglucosamine seems to be a common feature for O-linked oligosaccharides, and has been described both for skeletal keratan sulphates and respiratory mucin oligosaccharides. Low-abundance ions were also detected from oligosaccharides with sulphation at C-3 of an amino sugar residue. This seems to be a novel sulphation site for mucin oligosaccharides.

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