《英文msh词典》Uroporphyrinogen III
[入口词] Uroporphyrinogen III
[主题词] Uroporphyrinogens
[英文释义] Porphyrinogens which are intermediates in heme biosynthesis. They have four acetic acid and four propionic acid side chains attached to the pyrrole rings. Uroporphyrinogen I and III are formed from polypyrryl methane in the presence of uroporphyrinogen III cosynthetase and uroporphyrin I synthetase,respectively. They can yield uroporphyrins by autooxidation or coproporphyrinogens by decarboxylation.