Dh. Guimaraes et al., GUANYLCOBAMIDE AND HYPOXANTHYLCOBAMIDE - CORRINOIDS FORMED BY DESULFOVIBRIO-VULGARIS, Archives of microbiology, 162(4), 1994, pp. 272-276
The corrinoids synthesized by the sulfate-reducing bacterium Desulfovi
brio vulgaris were analyzed. The compounds found were guanylcobamide a
nd hypoxanthylcobamide; structures were determined by mass spectrometr
y, H-1-NMR, and ultraviolet/visible spectroscopy. D. vulgaris used ext
ernally added guanine to form guanylcobamide, as demonstrated with 8-C
-14-guanine. Addition of adenine did not lead to the formation of aden
ylcobamide (pseudovitamin B-12), whereas 5,6-dimethylbenzimidazole was
transformed into vitamin B-12.