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。
Donor substrate flexibility study of AtUGT89C1, a glycosyltransferase from <i>Arabidopsis thaliana</i>
作者:Prakash Parajuli、Ramesh Prasad Pandey、Sumangala Darsandhari、Yong Il Park、Jae Kyung Sohng
DOI:10.1080/07328303.2016.1251941
日期:2016.9.1
AtUGT89C1, a glycosyltransferase from Arabidopsis thaliana, has shown interesting characteristics such as accepting diverse NDP-D/L-sugars as glycosyl donors. Genistein was used as a substrate to probe in vitro reactions in which different NDP-sugars were used as sugar donors. Among nine different NDP-D/L-sugars tested, AtUGT89C1 accepted five of them, including UDP--D-glu-cose, UDP--D-galactose, dTDP--L-rhamnose, GDP--L-fucose, and dTDP--2-deoxy-D-glucose and conjugated sugar moieties from the respective donors with the 7-hydroxyl position of genistein. Results showed the promiscuous nature of AtUGT89C1 toward donor and acceptor substrates, thus expanding the biotechnological application of this enzyme in the production of natural and unnatural flavonoid glycosides.[GRAPHICS].
Production of highly water-soluble genistein α-diglucoside using an engineered O-α-glycoligase with enhanced transglycosylation activity and altered substrate specificity
作者:Jetendra Kumar Roy、Hee-Won Ahn、Jaeick Lee、Jin-Hyo Kim、Sang-Ho Yoo、Young-Wan Kim
DOI:10.1016/j.foodchem.2023.137898
日期:2024.3
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