The present invention provides a process for producing ribonucleosides by reacting a base donor with a ribose compound in the presence of nucleoside phosphorylase to form N-glycosidic linkage between the base moiety of the base donor and the ribose moiety of the ribose compound, which process is characterized by the use of an immobilized nucleoside phosphorylase preparation obtained by subjecting a mixture of an enzyme source having nucleosidase activity in addition to nucleoside phosphorylase activity and a photo-curable resin having a photosensitive radical at any position of the prepolymer chain structure thereof to irradiation with actinic rays, whereby the activity of the nucleosidase concomitantly present in the enzyme source is inhibited.
本发明提供了一种生产
核糖核苷的工艺,其方法是在核苷
磷酸化酶存在下,使碱基供体与
核糖化合物反应,在碱基供体的碱基和
核糖化合物的
核糖之间形成N-糖苷键,该工艺的特点是使用一种固定化的核苷
磷酸化
酶制剂,该制剂是将一种除具有核苷
磷酸化酶活性外还具有核苷酸酶活性的酶源和一种在其预聚物链结构的任一位置上具有光敏基的光固化
树脂的混合物置于阳极射线照射下而得到的,从而抑制了酶源中同时存在的核苷酸酶的活性。