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tétrapyrrole - translation to french
![[[Bilirubin]]](https://commons.wikimedia.org/wiki/Special:FilePath/Bilirubin ZZ.png?width=200 "[[Bilirubin]]")
![[[Biliverdin]]](https://commons.wikimedia.org/wiki/Special:FilePath/Biliverdin3.svg?width=200 "[[Biliverdin]]")
![[[Phycoerythrobilin]]](https://commons.wikimedia.org/wiki/Special:FilePath/Phycoerythrobilin.svg?width=200 "[[Phycoerythrobilin]]")
![[[Dinoflagellate]] (R=H) and [[krill]] (R=OH) [[luciferin]]](https://commons.wikimedia.org/wiki/Special:FilePath/Luciferin dinoflagellate.svg?width=200 "[[Dinoflagellate]] (R=H) and [[krill]] (R=OH) [[luciferin]]")
![[[uroporphyrinogen III]], an authentic tetrapyrrole](https://commons.wikimedia.org/wiki/Special:FilePath/Uroporphyrinogen III skeletal.svg?width=200 "[[uroporphyrinogen III]], an authentic tetrapyrrole")
![[[Heme]] group of hemoglobin with a [[porphin]] macrocycle.](https://commons.wikimedia.org/wiki/Special:FilePath/Heme.svg?width=200 "[[Heme]] group of hemoglobin with a [[porphin]] macrocycle.")
![group]] that varies between [[chlorophyll]] types.](https://commons.wikimedia.org/wiki/Special:FilePath/C-3 position Chlorophyll a.svg?width=200 "group]] that varies between [[chlorophyll]] types.")
![[[Cobalamin]] structure includes a [[corrin]] macrocycle.](https://commons.wikimedia.org/wiki/Special:FilePath/Cobalamin.svg?width=200 "[[Cobalamin]] structure includes a [[corrin]] macrocycle.")
Wikipedia
Tetrapyrroles are a class of chemical compounds that contain four pyrrole or pyrrole-like rings. The pyrrole/pyrrole derivatives are linked by (=(CH)- or -CH
2- units), in either a linear or a cyclic fashion. Pyrroles are a five-atom ring with four carbon atoms and one nitrogen atom. Tetrapyrroles are common cofactors in biochemistry and their biosynthesis and degradation feature prominently in the chemistry of life.
Some tetrapyrroles form the active core of compounds with crucial biochemical roles in living systems, such as hemoglobin and chlorophyll. In these two molecules, in particular, the pyrrole macrocycle ring frames a metal atom, that forms a coordination compound with the pyrroles and plays a central role in the biochemical function of those molecules.
