Genes encoding purine nucleoside phosphorylase (deo D), uridine phosphorylase (udp) and thimidine phosphorylase (deo A) from Escherichia coli BL21 were cloned and overexpressed in E. coli DH5alpha. The recombinant strains were employed to synthesize 2'-deoxyadenosine (dAR) and 6-methylpurine-2'-deoxyriboside (MePdR). Experimental parameters such as strains, temperature, pH, reagent concentration and cell mass were optimized. Under the optimal situation, 96% adenine was converted to dAR and 95% 6-methylpurine (MeP) was converted to MePdR in an hour, using 0.2 per thousand (dry wt./v) cell paste as biocatalyst.
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