The Donor Substrate Spectrum of Recombinant Sucrose Synthase 1 from Potato for the Synthesis of Sucrose Analogues
作者:Ulrike Römer、Carsten Rupprath、Lothar Elling
DOI:10.1002/adsc.200303015
日期:2003.6
The donor substrate spectrum of recombinant sucrose synthase 1 (SuSy1) from potato was studied in order to synthesise novel sucrose analogues. With D-fructose as acceptor substrate SuSy1 accepts a variety of UDP-activated sugars, e.g., UDP-N-acetyl-α-D-glucosamine (UDP-GlcNAc, 2) (100%), UDP-α-D-glucuronic acid (UDP-GlcA, 3) (32%), UDP-α-D-xylose (UDP-Xyl, 4) (39%), UDP-α-D-galactose (UDP-Gal, 5) (23%)
为了合成新型蔗糖类似物,研究了马铃薯中重组蔗糖合酶1(SuSy1)的供体底物谱。以D-果糖为受体底物,SuSy1可以接受多种UDP活化的糖,例如UDP- N-乙酰基-α-D-葡萄糖胺(UDP-GlcNAc,2)(100%),UDP-α-D-葡萄糖醛酸(UDP-GlcA,3)(32%),UDP-α-D-木糖(UDP-Xyl,4)(39%),UDP-α-D-半乳糖(UDP-Gal,5)(23%),和UDP- N-乙酰基-α-D-半乳糖胺(UDP-GalNAc,6)(23%)。动力学分析表明,非天然供体2(k cat / K m 1.2 s -1 mM -1)和5(k cat / K m 0.01 s -1 mM -1)与UDP-Glc 1(k cat / K m 310.4 s -1 mM -1)相较较差。UDP-GlcNAc用于制备合成中,产生188 mg(0.5 mmol)2-乙酰氨