Heme a

Heme a

Chembox new
ImageFile = Heme A.png ImageSize =
IUPACName =
OtherNames =
Section1 = Chembox Identifiers
CASNo = 18535-39-2
PubChem = 5288529
SMILES =
MeSHName = Heme+a
Section2 = Chembox Properties
Formula = C49H56O6N4Fe
MolarMass = 852.837
Appearance =
Density =
MeltingPt =
BoilingPt =
Section3 = Chembox Hazards
Solubility =
MainHazards =
FlashPt =
Autoignition =

Heme A differs from heme B in that a methyl side chain at ring position 8 is oxidized into a formyl group, and one of the vinyl side chains, at ring position 2, has been replaced by an isoprenoid chain. Like heme B, heme A is often attached to the apoprotein through a coordination bond between the heme iron and a conserved amino acid side-chain.

An example of a metalloprotein that contains heme A is cytochrome c oxidase.

Both the formyl group and the isoprenoid side chain are thought to play important roles in conservation of the energy of oxygen reduction by cytochrome c oxidase.

ee also

* Heme


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