Abstract
When studying the optimal conditions for the ribosidation of 6-azauracil it was found that the optimal cultivation time for the strainEscherichia coli 556 was 6–8 hours. Prolongation of the cultivation time slowed down the rate of ribosidation. On using 3-hour cells concentrated to the optimal extinction value 0.95 (corresponding to a 6-hour culture), ribosidation of 6-azauracil was only 50%. Either D-ribose itself or a saccharide capable of transformation in the presence of 6-azauracil, i.e. a saccharide which can be transformed by the enzyme system of the microorganism into D-ribose, should be used as the precursor of the riboside chain in the transformation of D-azauracil.
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