Urobilin
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The structure of Urobilin
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Urobilin is a yellow linear tetrapyrrole, resulting from the breakdown of haem, a cyclic tetrapyrrole. Urobilin is generated in intestines from bilirubin. It is absorbed into blood stream and is supposed to be degraded in liver. When there is liver failure, urobilin starts being excreted by kidneys. It then can be found in urine (which is abnormal sign, confirming jaundice), hence its name.
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| Major Families of Biochemicals | ||
| Peptides | Amino acids | Nucleic acids | Carbohydrates | Lipids | Terpenes | Carotenoids | Tetrapyrroles | Enzyme cofactors | Steroids | Flavonoids | Alkaloids | Polyketides | Glycosides | ||
| Analogues of nucleic acids: | Types of Tetrapyrroles | Analogues of nucleic acids: |
| Bilanes: | Bilirubin | Biliverdin | Urobilinogen | Urobilin | |
|---|---|---|
| Chlorophylls: | Protochlorophyllide | Chlorophyllide | |
| Corrinoids: | Cyanocobalamin | |
| Phycobilins: | Phycoerythrobilin | Phycocyanobilin | Phycourobilin | Phycoviolobilin | |
| Porphyrins: | Coproporphyrinogen | Protoporphyrin | Uroporphyrinogen | |
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