uroporphyrinogen(redirected from uroporphyrinogen III cosynthetase)
a porphyrinogen formed from porphobilinogen; it is a precursor of uroporphyrin and coproporphyrinogen.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
Intermediates in the biosynthesis of heme, as follows: four porphobilinogens condense to form uroporphyrinogens I and III (giving rise to side products uroporphyrins I and III) that are decarboxylated to form coproporphyrinogens I and III (giving rise to side products coproporphyrins I and III); coproporphyrinogen III is oxidized to protoporphyrinogen III (IX), which is then oxidized to form protoporphyrin III (IX) (this last intermediate adds ferrous iron to yield heme); certain porphyrinogens are elevated in certain porphyrias.
Farlex Partner Medical Dictionary © Farlex 2012
Intermediates in the biosynthesis of heme; certain porphyrinogens are elevated in certain porphyrias.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012