α-Glucuronidase is a very important enzyme for the complete hydrolysis of plant hemicellulose, but the substrate specificity of the enzyme has not previously been reported. In this connection, the three regioisomers of O-(α-d-glucopyranosyluronic acid)-d-xylose (aldobiouronic acid), 2–O-(α-d-glucopy-ranosyluronic acid)-d-xylose (13), 3–O-(α-d-glucopyranosyluronic acid)-d-xylose (14), and 4–O-(α-d-glucopyranosyluronic acid)-d-xylose (15), were stereoselectively synthesized to clarify the substrate specificity.
α-
葡萄糖醛酸酶是植物半
纤维素完全
水解过程中非常重要的酶,但该酶的底物特异性之前尚未报道。在这方面,立体选择性合成了O-(α-d-
葡萄糖吡喃糖苷醛酸)-d-
木糖(醛二糖酸)、2–O-(α-d-
葡萄糖吡喃糖苷醛酸)-d-
木糖 (13)、3–O-(α-d-
葡萄糖吡喃糖苷醛酸)-d-
木糖 (14) 和4–O-(α-d-
葡萄糖吡喃糖苷醛酸)-d-
木糖 (15)的三种区域异构体,以澄清其底物特异性。