Figure 1
The biosynthesis of uroporphyrinogen III from 5-aminolevulinic acid. The enzymes involved are (a) 5-aminolaevulinic acid dehydratase; (b) hydroxymethylbilane synthase (HMBS); and (c) uroporphyrinogen III synthase. A = CH2COO−; P = CH2CH2COO−. |