Abstract
Redox properties of cytochrome c 553(550) from Desulfovibrio desulfuricans Norway (E′ o = 0.04 ± 0.02 V/NHE) and cytochrome c 551 from P. aeruginosa (E′ o = 0.25 ± 0.02 V/NHE) are compared with those of some monohemic c-type cytochromes. The pK value for the equilibrium between the pH-dependent forms of cytochrome c 553(550) (pK = 10.3 ± 0.1) has been also determined. It is to be noted that the difference between redox potentials can extend to nearly 250 mV, though the axial heme ligands are identical. Structural reasons have to be invoked to explain these variations.
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