. "Catalysis of the reaction: protoheme = Fe(2+) + protoporphyrin IX." . . "ferrochelatase activity" . "ferro-protoporphyrin chelatase activity" . "heme synthase activity" . "heme synthetase activity" . "iron chelatase activity" . "protoheme ferro-lyase (protoporphyrin-forming)" . "protoheme ferro-lyase activity" . "protoheme ferrolyase activity" . . . .