- Phycourobilin
Chembox new
ImageFile=phycourobilin.png
ImageSize=200px
IUPACName=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
OtherNames=
Section1= Chembox Identifiers
CASNo=61932-71-6
PubChem=5289229
SMILES=CCC1=C(C(=O)N [C@H] 1CC2=C(C(=C(N2)C=C/3C(=C(C(=N3)C [C@@H] 4C(=C(C(=O)N4)CC)C)C)CCC(=O)O)CCC(=O)O)C)C
Section2= Chembox Properties
Formula=C33H42N4O6
MolarMass=590.71
Appearance=
Density=
MeltingPt=
BoilingPt=
Solubility=
Section3= Chembox Hazards
MainHazards=
FlashPt=
Autoignition=Phycourobilin is a
tetrapyrrole orange molecule involved inphotosynthesis in cyanobacteria and red algae. This chromophore is bound to thephycobiliprotein phycoerythrin , the distal component of the light-harvesting system of cyanobacteria and red algae (phycobilisome ).When bound to
phycoerythrin , phycourobilin shows an absorption maximum around 495 nm. This chromophore is always a donor chromophore ofphycoerythrin s, since their acceptor chromophore is alwaysphycoerythrobilin . It can also be linked to the linker polypeptides of thephycobilisome , in which its precise role remains unclear.Phycourobilin is found in marine
phycobilisome containing organisms, allowing them to efficiently absorb blue-green light. In the ubiquitous marine cyanobacteria "Synechococcus ", the amount of phycourobilin in thephycobilisome s 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.
Wikimedia Foundation. 2010.