title: The corrinoid from Methanobacterium thermoautotrophicum (Marburg strain). Spectroscopic structure analysis and identification as Co beta-cyano-5'-hydroxybenzimidazolyl-cobamide (factor III).
abstract: The corrinoids from Methanobacterium thermoautotrophicum were extracted as the Co-cyano derivative, which was isolated in crystalline form. A consistent set of spectroscopic data was acquired (ultraviolet/visible, circular dichroic, infrared, fast-atom-bombardment mass, 1H-NMR and 13C-NMR spectra), which allowed the structural analysis of this complete corrinoid. It was assigned the structure of the Co beta-cyano-5'-hydroxybenzimidazolyl-cobamide and was identified with Friedrich and Bernhauer's 'factor III' by comparison with an authentic sample.
mesh_terms: D002942:Circular Dichroism; D045728:Corrinoids; D019605:Euryarchaeota / Q000032:analysis*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008968:Molecular Conformation; D013053:Spectrophotometry; D014805:Vitamin B 12 / Q000031:analogs & derivatives* / Q000302:isolation & purification*
chemical_list: D045728:Corrinoids; C051329:factor III, vitamin B 12; D014805:Vitamin B 12