[Study of electron transfer in hemoproteins. IV. Oxidation of sperm whale oxymoglobin catalyzed by copper ions]. / Izuchenie perenosa élektrona v gemoproteinakh. IV. Kataliziruemoe ionami medi okislenie oksimioglobina kashalota.

The influence of cupric ions on the oxidation of sperm whale oxymoglobin and soybean oxyleghemoglobin at pH 4.8--7.5 and 10--40 degrees C has been studied. The stability constants of cupric ions to myoglobin were determined: K1 = 3.4 . 10(5) M(-1) for the more reactive center, and K2 = 2.1 . 10(3) M(-1) for the next 5--7 binding centers. The role of ionization of His-GH1 in the process of oxidation of sperm whale myoglobin is discussed. A mechanism of electron transfer from myoglobin molecule to the external acceptor is presented.