P

Ac Pr

Preuroporphyrinogen

Pr Pr

Uroporphyrinogen III

Porphobilinogen

Ac Pr

Preuroporphyrinogen

Pr Pr

Uroporphyrinogen III

V4 CO2 CH3

NH3 S-Aminolevulinate

Porphobilinogen

V4 CO2 CH3

Pr

Heme

Pr Pr

Protoporphyrin

Pr Pr

Protoporphyrinogen

Pr Pr

Coproporphyrinogen III

Heme

Pr Pr

Protoporphyrin

Pr Pr

Protoporphyrinogen

Pr Pr

Coproporphyrinogen III

FIGURE 22-24 Biosynthesis of heme from S-aminolevulinate. Ac represents acetyl (—CH2COO"); Pr, propionyl (—CH2CH2COO").

(1 porphobilinogen synthase

(2) uroporphyrinogen synthase uroporphyrinogen III cosynthase uroporphyrinogen decarboxylase

(5) coproporphyrinogen oxidase

(6) protoporphyrinogen oxidase ferrochelatase

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