title: Glycoblotting-assisted O-glycomics: ammonium carbamate allows for highly efficient o-glycan release from glycoproteins.
abstract: Glycoblotting, high throughput method for N-glycan enrichment analysis based on the specific chemical ligation between aminooxy/hydrazide-polymers/solids and reducing N-glycans released from whole serum and cellular glycoproteins, was proved to be feasible for selective enrichment analysis of O-glycans of common (mucin) glycoproteins. We established a standard protocol of glycoblotting-based O-glycomics in combination with nonenzymatic chemical treatment to release reducing O-glycans predominantly from various glycoprotein samples. It was demonstrated that the nonreductive condition employing a simple ammonium salt, ammonium carbamate, made glycoblotting-based enrichment analysis of O-glycans possible without significant loss or unfavorable side reactions. A general workflow of glycoblotting using a hydrazide bead (BlotGlyco H), on-bead chemical manipulations, and subsequent mass spectrometry allowed for rapid O-glycomics of human milk osteopontin (OPN) and urinary MUC1 glycoproteins purified from healthy donors in a quantitative manner. It was revealed that structures of O-glycans in human milk OPN were varied with habitual fucosylation and N-acetyllactosamine units. It was also suggested that purified human urinary MUC1 was modified preferentially by sialylated O-glycans (94% of total) with 7:3 ratio of core 1 to core 2 type O-glycans. Versatility of the present strategy is evident because this method was proved to be suited for the enrichment analysis of general biological and clinical samples such as human serum and urine, cultured human cancer cells, and formalin-fixed paraffin-embedded tissue sections. It is our belief that the present protocols would greatly accelerate discovery of disease-relevant O-glycans as potential biomarkers.
authors.affiliation: Ezose Sciences, Inc., 25 Riverside Drive Pine Brook, New Jersey 07058, United States.
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Miura
authors.forename: Kentaro
authors.initials: K
authors.lastname: Kato
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Takegawa
authors.forename: Masaki
authors.initials: M
authors.lastname: Kurogochi
authors.forename: Jun-Ichi
authors.initials: J
authors.lastname: Furukawa
authors.forename: Yasuro
authors.initials: Y
authors.lastname: Shinohara
authors.forename: Noriko
authors.initials: N
authors.lastname: Nagahori
authors.forename: Maho
authors.initials: M
authors.lastname: Amano
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Hinou
authors.forename: Shin-Ichiro
authors.initials: S
authors.lastname: Nishimura
mesh_terms: D015415:Biomarkers; D002219:Carbamates / Q000737:chemistry*; D054794:Glycomics / Q000379:methods*; D006023:Glycoproteins / Q000737:chemistry*; D006801:Humans; D011134:Polysaccharides / Q000737:chemistry*
chemical_list: D015415:Biomarkers; D002219:Carbamates; D006023:Glycoproteins; D011134:Polysaccharides; C070766:carbamic acid