Two delta-aminolevulinic acids make porphobilinogen ring, which becomes tetrapyrrole, which makes molecules {porphyrin}|. Porphyrin can make heme. Chlorophyll has porphyrin ring, as does cytochrome oxidase. If bad metabolism causes porphyrin to have no metal inside, porphyrin goes to skin, bones, and teeth, where light makes free radicals {porphyria}.
Iron-containing ring structure {heme} can derive from succinyl-CoA of TCA cycle. Two delta-aminolevulinic acids make porphobilinogen ring, which becomes tetrapyrrole, which makes porphyrin. Porphyrin can make heme. Heme breakdown product is bilirubin, excreted in urine.
5-Chemistry-Biochemistry-Carbohydrate-Carbohydrates
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Date Modified: 2022.0225