Phycourobilin



Phycourobilin
IUPAC name 3-[2-[(Z)-[3-(2-carboxyethyl)-5-[ [(2R)-4-ethyl-3-methyl-5-oxo-1,2-dihydropyrrol-2-yl]methyl]-4-methyl-2-pyrrolylidene]methyl]-5-[ [(2S)-3-ethyl-4-methyl-5-oxo-1,2-dihydropyrrol-2-yl]methyl]-4-methyl-1H-pyrrol-3-yl]propanoic acid
Identifiers
CAS number 61932-71-6
PubChem 5289229
SMILES CCC1=C(C(=O)N[C@H]1CC2=C(C(=C(N2)\C=C/3\C(=C(C(=N3)C[C@@H]4C(=C(C(=O)N4)CC)C)C)CCC(=O)O)CCC(=O)O)C)C
Properties
Molecular formula C33H42N4O6
Molar mass 590.71
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references

Phycourobilin is a tetrapyrrole orange molecule involved in phycobilisome).

When bound to phycoerythrin, phycourobilin shows an absorption maximum around 495 nm. This chromophore is always a donor chromophore of phycoerythrins, since their acceptor chromophore is always phycobilisome, in which its precise role remains unclear.

Phycourobilin is found in marine phycobilisomes is correlated to the ecological niche the cells inhabit: offshore Synechococcus are quite phycourobililin-rich, while coastal Synechococcus contain very little or no phycourobilin. This represents a remarkable adaptation of the cyanobacterial light-harvesting system, as oceanic waters are relatively richer in blue light than onshore waters.

 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Phycourobilin". A list of authors is available in Wikipedia.