The acceptor specificity of amylomaltase from Escherichia coli IFO 3806.
作者:Sumio KITAHATA、Hiromi MURAKAMI、Yoshiaki SONE、Akira MISAKI
DOI:10.1271/bbb1961.53.2661
日期:——
The acceptor specificity of amylomaltase from Eschenchia coli IFO 3806 was investigated using various sugars and sugar alcohols. D-Mannose, D-glucosamine, N-acetyl-D-glucosamine, D-xylose, D-allose, isomaltose, and cellobiose were efficient acceptors in the transglycosylation reaction of this enzyme. It was shown by chemical and enzymic methods that this enzyme could transfer glycosyl residues only to the C4-hydroxyl groups of D-mannose, N-acetyl-D-glucosamine, D-allose, and D-xylose, producing oligosaccharides terminated by 4-O-α-D-glucopyranosyl-D-mannose, 4-O-α-D-glucopyranosyl-N-acetyl-D-glucosamine, 4-O-α-D-glucopyranosyl-D-allose, and 4-O-α-D-glucopyranosyl-D-xylose at the reducing ends, respectively.
使用各种糖和糖醇研究了大肠埃希氏菌 IFO 3806 淀粉麦芽糖酶的接受特异性。在该酶的转糖基化反应中,D-甘露糖、D-葡萄糖胺、N-乙酰-D-葡萄糖胺、D-木糖、D-阿洛糖、异麦芽糖和纤维生物糖是有效的接受体。化学和酶法研究表明,这种酶只能将糖基残基转移到 D-甘露糖、N-乙酰-D-葡糖胺、D-阿洛糖和 D-木糖的 C4-羟基上、产生的寡糖在还原端分别以 4-O-α-D-吡喃葡萄糖基-D-甘露糖、4-O-α-D-吡喃葡萄糖基-N-乙酰-D-葡糖胺、4-O-α-D-吡喃葡萄糖基-D-阿洛糖和 4-O-α-D-吡喃葡萄糖基-D-木糖终止。