Stereoselective thioglycoside syntheses. Part 6. Aryl 4-thiomalto-oligosaccharides as chromogenic substrates for kinetic studies with α-amylase
作者:Michèle Blanc-Muesser、Jacques Defaye、Hugues Driguez、Guy Marchis-Mouren、Christiana Seigner
DOI:10.1039/p19840001885
日期:——
and their corresponding oxygen analogues were used, in comparative assays, as chromogenic substrates with porcine and human pancreatic α-amylases. In both series, enzymic velocity was higher for the maltotrioside derivatives than for the maltodisaccharides. o-Nitrophenyl glycosides behave as better substrates than the corresponding para isomers. Replacement of intersaccharide oxygen atoms by sulphur
Nucleophitic双分子取代,任一的ö -或p -硝基苯基2,3,6-三- ø -苯甲酰基-4- ö三氟甲基磺酰基α- d -galactopyranoside(1)或(2)与1钠盐在通常的脱保护序列之后,在六甲基磷酰胺中的-硫代-α- D-吡喃葡萄糖得到了邻和对硝基苯基4-硫代-α-麦芽糖苷(7)和(8)。与一个类似的合成方案(1)和4- thiomaltose(的1-α-硫醇盐12)导致Õ-硝基苯基4,4'-二硫代-α-麦芽三糖苷(15)。在比较试验中,将这些4-硫代寡糖及其相应的氧类似物用作猪和人胰腺α-淀粉酶的显色底物。在两个系列中,麦芽三糖苷衍生物的酶促速度均高于麦芽二糖。与相应的对位异构体相比,邻硝基苯基糖苷的底物性能更好。硫取代糖间氧原子会稍微提高米氏常数,但对水解速率有负面影响。因此,4-thiomaltosylpligosaccharides与他们相比有猪胰α淀粉酶