The reaction of conversion of verdoheme to Fe(III)biliverdin was studi
ed with different hemeproteins (Mb, HRP, and BrCN modified Mb), It was
shown that the heme iron of Mb is not involved in this reaction. It w
as also shown that the extra oxygen atom in biliverdin does not come f
rom H2O2 or water molecules. Based on these results a mechanism for th
is reaction is proposed.