SCHEDULED MAINTENANCE
New syntheses of the isomeric tripropionic prophyrins (3a) and (3b) have been carried out, and the feeding of the porphyrinogens (5b) and (5c)(labelled with tritium) to an enzyme system from Euglena gracilis has confirmed the hypothesis that the 2-propionic acid side-chain is modified before the 4-substituent in the biosynthesis of protoporphyrinogen-IX (5d) from coproporphyrinogen-III (5a).
J. A. S. Cavaleiro, G. W. Kenner and K. M. Smith, J. Chem. Soc., Chem. Commun., 1973, 183 DOI: 10.1039/C39730000183
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