Hemoglobin question

[Revilla]

Very basic -- how many iron atoms are there in a molecule of Hemoglobin? I know there are four oxygens, but are there four irons or just one?

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[StIGMA]

There are 4 Fe atoms in (tetrameric) hemoglobin. Hemoglobin has 2 alpha and 2 beta subunits. Each subunit has a prosthetic heme group, which is chelated to an iron atom.

 

[Revilla]

(1) Thanks for the answer!
(2) Thanks for that quick reply! Much appreciated!