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  • Title: Biosynthesis of vitamin B12: nature of the volatile fragment generated during formation of the corrin ring system.
    Author: Mombelli L, Nussbaumer C, Weber H, Müller G, Arigoni D.
    Journal: Proc Natl Acad Sci U S A; 1981 Jan; 78(1):11-2. PubMed ID: 6938989.
    Abstract:
    It is shown with the help of radiolabeled substrates that biological formation of the corrin ligand system of cobyrinic acid is linked with the release of an equivalent of acetic acid from a hydroporphinoid precursor in which the C-20 atom has undergone methylation prior to its excision from the macrocycle.
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