Synthesis and Characterization of a Carbene-Generating Biotinylated Lactosylceramide Analog as a Novel Chromogenic Photoprobe for GM3 Synthase.
作者:Yasumaru HATANAKA、Makoto HASHIMOTO、Kazuya I.-P. Jwa HIDARI、Yutaka SANAI、Yasuhiro TEZUKA、Yoshitaka NAGAI、Yuichi KANAOKA
DOI:10.1248/cpb.44.1111
日期:——
A new biotinylated lactose derivative bearing a nitro-substituted chromogenic diazirine was synthesized. The biotinyl group within the structure enabled the performance of a convenient assay of GM3 synthase based on avidin-biotin technology, and the Km values of this biotinylated photoprobe were determined as 40 and 47 μM using bovine brain and rat liver Golgi as enzyme sourced, respectively. Furthermore, the sialylation of lactosylceramide, a natural acceptor substrate for GM3 synthase, was completitively inhibited by this synthetic analog. The reagent could be a useful chromogenic photoprobe for GM3 synthase.
我们合成了一种新的生物素化乳糖衍生物,它带有硝基取代的发色性二氮杂环胺。以牛脑和大鼠肝脏高尔基体为酶源,测定了这种生物素化光探针的 Km 值分别为 40 和 47 μM。此外,乳糖基甘油酰胺(GM3 合成酶的天然接受底物)的糖酰化也被这种合成类似物完全抑制。该试剂可作为 GM3 合成酶的一种有用的显色光探针。