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Heme a

Heme a
CAS number 18535-39-2
PubChem 5288529
MeSH Heme+a
Molecular formula C49H56O6N4Fe
Molar mass 852.837
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

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chain at ring position 8 is oxidized into a formyl group, and one of the vinyl side chains, at ring position 2, has been replaced by an isoprenoid chain.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.

See also

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