Use of diethyl squarate for the coupling of oligosaccharide amines to carrier proteins and characterization of the resulting neoglycoproteins by MALDI-TOF mass spectrometry.
The 8-methoxycarbonyloctyl glycosides of GlcNAc beta, Gal beta 1-4Glc beta, Fuc alpha 1-2Fuc alpha 1-3GalNAc beta and Fuc alpha 1-2Gal beta 1-3[Fuc alpha 1-4]GlcNac beta were converted to primary amines by reaction with neat ethylenediamine and then coupled to bovine serum albumin (BSA) using diethyl squarate as the connector. The average degree of incorporation of the sugar onto the protein, as well as the molecular weight distribution, could be conveniently determined using matrix assisted laser desorption ionization/time of flight (MALDI-TOF) mass spectrometry thus avoiding cumbersome structure-dependent colour-tests or analysis of cleaved ligand. The present coupling method has the advantages of proceeding under very mild conditions, yielding controlled incorporation values and can reliably be used for the coupling of very small amounts (mg) of oligosaccharide.
Kamath
V P
VP
Department of Chemistry, University of Alberta, Edmonton, Canada.
Diedrich
P
P
Hindsgaul
O
O
D000117:Acetylglucosamine; D000588:Amines; D000818:Animals; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002352:Carrier Proteins; D002417:Cattle; D003503:Cyclobutanes; D004187:Disaccharides / Q000138:chemical synthesis / Q000737:chemistry; D006023:Glycoproteins / Q000138:chemical synthesis*; D006027:Glycosides; D007202:Indicators and Reagents; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000138:chemical synthesis* / Q000737:chemistry; D012710:Serum Albumin, Bovine; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods
D000588:Amines; D002352:Carrier Proteins; D003503:Cyclobutanes; D004187:Disaccharides; D006023:Glycoproteins; D006027:Glycosides; D007202:Indicators and Reagents; D009844:Oligosaccharides; C101250:diethyl squarate; D012710:Serum Albumin, Bovine; D000117:Acetylglucosamine