title: 2-Imino-2-methoxyethyl 1-thioglycosides: new reagents for attaching sugars to proteins.
abstract: Cyanomethyl 1-thioglycosides ofD-galactose, D-glucose, 2-acetamido-2-deoxy-D-glucose, and D-mannose were prepared from the respective pseudothiourea derivatives and chloroacetonitrile. The nitrile group in these cyanomethyl thioglycosides can be converted to a methyl imidate group by treatment with sodium methoxide or HC1 in dry methanol to yield 2-imino-2-methoxyethyl 1-thioglycosides (IME-thioglycosides). The factors influencing the yield of IME-thioglycosides were investigated. The most convenient method of preparing IME-thioglycosides was treating 0.1 M cyanomethyl thioglycoside peracetate in dry methanol with 0.01 M sodium methoxide at room temperature for 24-48 h (50-60% yield). These IME-thioglycosides reacted readily with simple amines, amino acids, and proteins in mildly alkaline buffer solutions. Alpha-amylase and lysozyme modified with these reagents under appropriate conditions retained full activities. Thus the IME-thioglycosides constitute a new group of reagents for attaching sugars to proteins.
mesh_terms: D000117:Acetylglucosamine; D000681:Amylases; D001665:Binding Sites; D055598:Chemical Phenomena; D002621:Chemistry; D002855:Chromatography, Thin Layer; D005690:Galactose; D005947:Glucose; D006601:Hexoses; D007700:Kinetics; D008358:Mannose; D009113:Muramidase; D009904:Optical Rotation; D011485:Protein Binding; D011506:Proteins; D012710:Serum Albumin, Bovine; D013865:Thioglycosides
chemical_list: D006601:Hexoses; D011506:Proteins; D013865:Thioglycosides; D012710:Serum Albumin, Bovine; D000681:Amylases; D009113:Muramidase; D005947:Glucose; D008358:Mannose; D000117:Acetylglucosamine; D005690:Galactose