Tetrapyrroles are compounds containing four pyrrole rings. With the exception of corrin, the four pyrrole rings are interconnected through one-carbon (methine or methylene) bridges, either in a linear or cyclic fashion.
Linear tetrapyrroles, using three one-carbon bridges, include:
Cyclic tetrapyrroles, using four one-carbon bridges, include:
Corrins are cyclic tetrapyrroles that have replaced one of the conventional methine bridges with a direct interpyrrole bond.
Types of tetrapyrroles
|Bilanes:||Bilirubin | Biliverdin | Urobilinogen | Urobilin|
|Chlorophylls:||Protochlorophyllide | Chlorophyllide|
|Phycobilins:||Phycoerythrobilin | Phycocyanobilin | Phycourobilin | Phycoviolobilin|
|Porphyrins:||Uroporphyrinogen (I, III) | Coproporphyrinogen (I, III) | Protoporphyrinogen IX | Protoporphyrin (IX) | Zinc protoporphyrin|
|Major families of biochemicals|
|Peptides | Amino acids | Nucleic acids | Carbohydrates | Nucleotide sugars | Lipids | Terpenes | Carotenoids | Tetrapyrroles | Enzyme cofactors | Steroids | Flavonoids | Alkaloids | Polyketides | Glycosides|
|Analogues of nucleic acids:||Analogues of nucleic acids:|
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