One-Pot Two-Step Enzymatic Coupling of Pyrimidine Bases to 2-Deoxy-<scp>d</scp>-ribose-5-phosphate. A New Strategy in the Synthesis of Stable Isotope Labeled Deoxynucleosides
作者:N. Ouwerkerk、M. Steenweg、M. de Ruijter、J. Brouwer、J. H. van Boom、J. Lugtenburg、J. Raap
DOI:10.1021/jo0107249
日期:2002.3.1
5'-(13)C(2)]- and [1',2',5'-(13)C(3)]thymidine as well as [1',2',5'-(13)C(3)]2'-deoxyuridine and [3',4'-(13)C(2)]2'-deoxycytidine. In addition the nucleoside bases thymine and uracil are tetralabeled at the (1,3-(15)N(2),2,4-(13)C(2))-atomic positions. All compounds are prepared without any scrambling or dilution of the labeled material and are thus obtained with a very high isotope enrichment (96-99%). In combination
使用磷酸核糖转移酶(PRM)和可商购的胸苷磷酸化酶(TP),通过一锅两步反应,由2-脱氧-D-核糖-5-磷酸进行胸苷的酶促合成。在第一步中,将糖5-磷酸酶重排成α-2-脱氧-D-核糖-1-磷酸。高活性的PRM可以很容易地从转基因的过量生产的大肠杆菌细胞(12,000单位/ 84 mg蛋白质)中获得,无需进一步纯化即可使用。在第二步骤中,将胸腺嘧啶偶联至糖-1-磷酸。通过添加MnCl(2)沉淀无机磷酸盐,将热力学上不利的平衡转移到产物上。以这种方式,β-异头物纯核苷的总产率从14%增加到60%。与尿嘧啶相反,TP不接受胞嘧啶作为底物。因此,2' -脱氧胞苷通过酶促制备的2'-脱氧尿苷的官能团转化而获得。该方法已通过[2',5'-(13)C(2)]-和[1',2',5'-(13)C(3)]胸苷以及[1]的合成证明',2',5'-(13)C(3)] 2'-脱氧尿苷和[3',4'-(13)C(2)]