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Synthesis of 2-chloro-2′-deoxyadenosine by microbiological transglycosylation using a recombinant Escherichia coli strain

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Cladribine (2-chloro-2′-deoxyadenosine) was synthesized using intact cells of the recombinant Escherichia coli strain producing Geobacillus stearothermophilus B-2194 thermostable purine-nucleoside phosphorylase II (EC 2.4.2.1). Use of the cells containing this thermostable enzyme allowed the process to be conducted at a temperature of 70°C, which provided the maximal concentrations of sparingly soluble substrates. The best results were obtained with 2-chloroadenine as a modified base. The highest yield of the target 2-chloro-2′-deoxyadenosine (up to 95% in the case of deoxyguanosine) was reached when using 2′-deoxypurines as donors of deoxyribose. Use of thymidine for these purposes required its considerable molar excess over 2-chloroadenine (up to 6:1), which is connected with a nonoptimal amount of endogenous thymidine phosphorylase, necessary for synthesis of deoxyribose-1-phosphate, in the transglycosylation reaction.

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Correspondence to S. A. Taran.

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Original Russian Text © S.A. Taran, K.N. Verevkina, T.Z. Esikova, S.A. Feofanov, A.I. Miroshnikov, 2008, published in Prikladnaya Biokhimiya i Mikrobiologiya, 2008, Vol. 44, No. 2, pp. 181–186.

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Taran, S.A., Verevkina, K.N., Esikova, T.Z. et al. Synthesis of 2-chloro-2′-deoxyadenosine by microbiological transglycosylation using a recombinant Escherichia coli strain. Appl Biochem Microbiol 44, 162–166 (2008). https://doi.org/10.1134/S0003683808020063

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  • DOI: https://doi.org/10.1134/S0003683808020063

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