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The 5,6-dimethylbenzimidazole unit of vitamin B 12  is formed from riboflavin via FMN in aerobic and some aerotolerant bacteria. Thereby C-1′ of the ribityl side chain gets C-2 of 5,6-dimethylbenzimidazole. Experiments with homogenates of Propionibacterium shermanii on the fate of C-atoms 2′ to 5′ of the ribityl side chain of riboflavin in this transformation are reported. It was found that [5′- 3 H]riboflavin leads to radioactive sugar phosphates. These were isolated, dephosphorylated, and separated. Thus  3 H-D-fructose and  3 H-D-glucose were detected. The degradation of  3 H-D-glucose revealed that 14 per cent of the of the total radioactivity was located in C-1, and 86 per cent in C-6. This indicates that during 5,6-dimethylbenzimidazole biosynthesis a three carbon unit is formed from the ribityl side chain of riboflavin.

Umwandlung von [5' - 3 H]Riboflavin in 5,6-Dimethylbenzimidazol / Transformation of [5'- 3 H]Riboflavin into 5,6-Dimethylbenzimidazole