Evidence is presented from 13C n.m.r. spectroscopic studies which indicates that the enzymic transformation of porphobilinogen into uroporphyrinogens I and III occurs through a transient free intermediate, pre-uroporphyrinogen, produced by porphobilinogen deaminase (uroporphyrinogen I synthetase).
G. Burton, P. E. Fagerness, S. Hosozawa, P. M. Jordan and A. I. Scott, J. Chem. Soc., Chem. Commun., 1979, 202 DOI: 10.1039/C39790000202
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