Abstract
Nucleoside N-deoxyribosyl transferases (EC 2.4.2.6) from Lactobacillus leichmanii will catalyse the transfer of 2-deoxyribose from thymidine or 2′-deoxycytidine to 5-aminoimidazole-4-carboxamide or benzimidazole. 1-β-D-2′-Deoxyribofuranosyl-5-aminoimidazole-4-carboxamide and 1-0-D-2′-deoxyribofuranosyl-benzimidazole, respectively, are the only products which are formed.