Synthesis of Alpha-Linked Glucosides from Soybean Isoflavone Aglycones Using Amylosucrase from <i>Deinococcus geothermalis</i>
作者:Young Sung Jung、Hyoung-Geun Kim、Seon Min Oh、Dae Young Lee、Cheon-Seok Park、Dae-Ok Kim、Nam-In Baek
DOI:10.1021/acs.jafc.2c07778
日期:2023.2.8
confirmed. The structures of the isolated compounds were identified by massspectrometry and multidimensional nuclear magnetic resonance spectroscopy. The amylosucrase transglycosylation formed new isoflavone glycosides with alpha glycosidic bonds at C-7 and/or C-4′ of SIAs, followed by the production of isoflavone glycosides with alpha (1 → 6) glycosidic bonds. The products with a glucosyl moiety attached
大豆异黄酮苷元(SIA)具有多种生物活性,但在人体内水溶性较差。糖基化为 SIA 提供了结构多样性,并可以改变其理化性质,包括水溶性。使用来自地热奇球菌的淀粉蔗糖酶实现了 SIA 的 α 连接葡萄糖基化。总共获得了13个α-连接的葡萄糖基SIA,并确认了它们在溶液中的颜色。通过质谱和多维核磁共振波谱鉴定了分离化合物的结构。淀粉蔗糖酶转糖基化在SIAs的C-7和/或C-4'处形成具有α糖苷键的新异黄酮糖苷,随后产生具有α(1→6)糖苷键的异黄酮糖苷。发现具有连接到 SIA 的 C-4' 上的葡萄糖基部分的产物比连接到 C-7 和/或 β-键上的对应物具有更高的水溶性。这项研究提出了一种通过α-连接的糖基化合成具有增强水溶性的生物活性化合物的策略。
pH-promoted O-α-glucosylation of flavonoids using an engineered α-glucosidase mutant
作者:Chao Li、Jetendra Kumar Roy、Ki-Cheul Park、Art E. Cho、Jaeick Lee、Young-Wan Kim
DOI:10.1016/j.bioorg.2020.104581
日期:2021.2
Retaining glycosidasemutants lacking its general acid/base catalytic residue are originally termed thioglycoligases which synthesize thio-linked disaccharides using sugar acceptor bearing a nucleophilic thiol group. A few thioglycoligases derived from retaining α-glycosidases have been classified into a new class of catalysts, O-glycoligases which transfer sugar moiety to a hydroxy group of sugar