作者:Deepani Indurugalla、Jacqueline N. Watson、Andrew J. Bennet
DOI:10.1039/b613909d
日期:——
Two isomeric 4-methylumbelliferyl-α-D-N-acetylneuraminylgalactopyranosides (1 and 2) were synthesised. These compounds contain either the natural α-2,3 or α-2,6 sialyl–galactosyl linkages, as well as an attached 4-methylumbelliferone for convenient detection of their hydrolyses. These compounds were designed as natural sialoside analogues to be used in a continuous assay of sialidase activity, where the sialidase-catalysed reaction is coupled with an exo-β-galactosidase-catalysed hydrolysis of the released galactoside to give free 4-methylumbelliferone. The kinetic parameters for 1 and 2 were measured using the wild-type and nucleophilic mutant Y370G recombinant sialidase from Micromonospora viridifaciens. Kinetic parameters for these analogues measured using the new continuous assay were in good agreement with the parameters for the natural substrate, 3′-sialyl lactose. Given the selection of commercially available exo-β-galactosidases that possess a variety of pH optima, this new method was used to characterise the full pH profile of the wild-type sialidase with the natural sialoside analogue 1. Thus, use of these new substrates 1 and 2 in a continuous assay mode, which can be detected by UV/Vis or fluorescence spectroscopy, makes characterisation of sialidase activity with natural sialoside linkages much more facile.
我们合成了两种异构的 4-甲基伞形酮基-α-D-N-乙酰神经氨酰半乳糖苷(1 和 2)。这些化合物含有天然的 α-2,3 或 α-2,6 水杨酰-半乳糖苷链节,以及附着的 4-甲基伞形酮,便于检测其水解情况。这些化合物被设计为天然半乳糖苷类似物,可用于半乳糖苷酶活性的连续检测,其中半乳糖苷酶催化的反应与外-β-半乳糖苷酶催化的半乳糖苷释放水解结合在一起,生成游离的 4-甲基伞形酮。1 和 2 的动力学参数是使用野生型和亲核突变体 Y370G 重组硅糖苷酶测定的。使用新的连续测定法测得的这些类似物的动力学参数与天然底物 3′-硅烷基乳糖的参数非常一致。鉴于市售的外-β-半乳糖苷酶具有多种最适 pH 值,这种新方法可用于鉴定野生型硅氨糖苷酶与天然硅氨糖苷类似物 1 的整个 pH 值曲线。因此,在可通过紫外/可见光或荧光光谱检测的连续测定模式中使用这些新底物 1 和 2,可以更方便地鉴定天然半乳糖苷连接物的半乳糖苷酶活性。