通过酶促过程合成寡糖提供了将寡糖推向药物研究前沿的潜力,部分原因在于方便和可扩展的反应方案。糖合酶是一类新兴的突变酶,能够以高产率合成糖苷键。我们报告了一种由大肠杆菌 β-半乳糖苷酶的点突变产生的新糖合酶,该酶将 α-半乳糖基氟与芳基糖苷缩合形成 β-(1,6) 糖苷键。酶内靠近活性位点的进一步点突变显着提高了产量。关键词:糖基转移,糖合酶,酶促寡糖合成。四氢恶嗪、异法米明、亚氨基蔗糖、糖苷酶抑制剂。 [Traduit par la Redaction]
Enzymic .beta.-Galactosidation of Modified Monosaccharides: Study of the Enzyme Selectivity for the Acceptor and Its Application to the Synthesis of Disaccharides
作者:Rosa Lopez、Alfonso Fernandez-Mayoralas
DOI:10.1021/jo00083a013
日期:1994.2
The selectivity of the E. coli beta-galactosidase-catalyzed glycosylation of monosaccharides differently substituted at the anomeric position has been studied. Substituents bearing a phenyl ring increase the enzyme-acceptor binding; however, partial enzyme inhibition occurs. The regioselectivity of the glycosylation was dependent on small variations in the monosaccharide accceptor, such as the atom linked to the anomeric carbon and the number of methylenes between this atom and aromatic ring. A schematic model is proposed that accounts for the results. The information from this study allows the direct synthesis of disaccharides, with high regioselectivity and yields ranging from 30 to 40%.
On expanding the repertoire of glycosynthases: Mutant β-galactosidases forming β-(1,6)-linkages
作者:David L Jakeman、Stephen G Withers
DOI:10.1139/v02-077
日期:2002.8.1
Oligosaccharidesynthesis by enzymatic processes offers the potential for thrusting oligosaccharides to the forefront of pharmaceutical research, in part, due to expedient and scalable reaction protocols. Glycosynthases are an emerging class of mutant enzymes capable of synthesizing glycosidic linkages in high yield. We report a new glycosynthase enzyme generated by a point mutation of E. coli β-galactosidase
通过酶促过程合成寡糖提供了将寡糖推向药物研究前沿的潜力,部分原因在于方便和可扩展的反应方案。糖合酶是一类新兴的突变酶,能够以高产率合成糖苷键。我们报告了一种由大肠杆菌 β-半乳糖苷酶的点突变产生的新糖合酶,该酶将 α-半乳糖基氟与芳基糖苷缩合形成 β-(1,6) 糖苷键。酶内靠近活性位点的进一步点突变显着提高了产量。关键词:糖基转移,糖合酶,酶促寡糖合成。四氢恶嗪、异法米明、亚氨基蔗糖、糖苷酶抑制剂。 [Traduit par la Redaction]