title: Rapid and simple solid-phase esterification of sialic acid residues for quantitative glycomics by mass spectrometry.
abstract: A rapid and quantitative method for solid-phase methyl esterification of carboxy groups of various sialylated oligosaccharides has been established. The method employed a triazene derivative, 3-methyl-1-p-tolyltriazene, for facile derivatization of oligosaccharides immobilized onto general solid supports such as Affi-Gel Hz and gold colloidal nanoparticles in a multiwell plate. The workflow protocol was optimized for the solid-phase processing of captured sialylated/unsialylated oligosaccharides separated from crude sample mixtures by chemical ligation. From tryptic and/or PNGase F-digest mixtures of glycoproteins, purification by chemoselective immobilization, esterification and recovery were achieved in the same well of the filter plate within three hours when used in conjunction with "glycoblotting technology" (S.-I. Nishimura, K. Niikura, M. Kurogochi, T. Matsushita, M. Fumoto, H. Hinou, R. Kamitani, H. Nakagawa, K. Deguchi, N. Miura, K. Monde, H. Kondo, High-throughput protein glycomics: Combined use of chemoselective glycoblotting and MALDI-TOF/TOF mass spectrometry: Angew. Chem. 2005, 117, 93-98; Angew. Chem. Int. Ed. 2005, 44, 91-96). The recovered materials were directly applicable to subsequent characterization by mass spectrometric techniques such as MALDI-TOF for large-scale glycomics of both neutral and sialylated oligosaccharides. On-bead/on-gold nanoparticle derivatization of glycans containing sialic acids allowed rapid and quantitative glycoform profiling by MALDI-TOF MS with reflector and positive ion mode. In addition to its simplicity and speed, the method eliminates the use of unfavorable halogenated solvents such as chloroform and dichloromethane or volatile solvents such as diethyl ether and hexane, resulting in a practical and green chemical method for automated robotic adaptation.
authors: Graduate School of Advanced Life Science, Frontier Research Center for Post-Genome Science and Technology, Hokkaido University, N21, W11, Sapporo 001-0021, Japan.
authors: Yoshiaki
authors: Y
authors: Miura
authors: Yasuro
authors: Y
authors: Shinohara
authors: Jun-ichi
authors: J
authors: Furukawa
authors: Noriko
authors: N
authors: Nagahori
authors: Shin-Ichiro
authors: S
authors: Nishimura
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D004951:Esterification; D006046:Gold / Q000737:chemistry; D046228:Microarray Analysis; D008969:Molecular Sequence Data; D019158:N-Acetylneuraminic Acid / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry; D009844:Oligosaccharides / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D014226:Triazenes / Q000737:chemistry*
chemical_list: D009844:Oligosaccharides; D011134:Polysaccharides; D014226:Triazenes; C019199:methyl-4-tolyltriazene; D006046:Gold; D019158:N-Acetylneuraminic Acid