title: Measurement of the oxidation-reduction potentials of amicyanin and c-type cytochromes from Paracoccus denitrificans.
abstract: The oxidation-reduction potentials of four periplasmic electron carrier proteins from Paracoccus denitrificans have been determined. Their midpoint potentials are: amicyanin, 294 +/- 6 mV; cytochrome c-550, 253 +/- 5 mV; cytochrome c-551i, 190 +/- 4 mV; and cytochrome c-553i, 148 +/- 5 mV. Although rapid amicyanin-mediated transfer of electrons from methylamine dehydrogenase to cytochrome c-551i was observed, reduced amicyanin did not reduce oxidized cytochrome c-551i in the absence of methylamine dehydrogenase.
mesh_terms: D001426:Bacterial Proteins; D003574:Cytochrome c Group / Q000378:metabolism*; D004579:Electron Transport; D008667:Metalloproteins / Q000378:metabolism*; D010084:Oxidation-Reduction; D000587:Oxidoreductases Acting on CH-NH Group Donors / Q000378:metabolism; D010231:Paracoccus denitrificans / Q000032:analysis*
chemical_list: D001426:Bacterial Proteins; D003574:Cytochrome c Group; D008667:Metalloproteins; C083951:cytochrome c553; C017079:mauC protein, Methylobacterium extorquens; C017167:cytochrome C(551); C022302:cytochrome C-552; C031732:cytochrome C-550; C021567:methylamine dehydrogenase; D000587:Oxidoreductases Acting on CH-NH Group Donors