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  • Title: Biosynthesis of vitamin B12: mode of incorporation of factor III into cobyrinic acid.
    Author: Nussbaumer C, Imfeld M, Wörner G, Müller G, Arigoni D.
    Journal: Proc Natl Acad Sci U S A; 1981 Jan; 78(1):9-10. PubMed ID: 6938991.
    Abstract:
    Extensive chemical degradation of cobyrinic acid biosynthesized from a sample of factor III radiochemically labeled in its three methyl groups demonstrates that label is retained exclusively in the two methyl groups at positions C-2 and C-7 and confirms that the C-20 methyl group of the precursor is lost during formation of the corrin ring system.
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