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Protoporphyrinogen oxidation coupled to nitrite reduction with membranes from Desulfovibrio gigas

The oxidation of protoporphyrinogen by membranes from Desulfovibrio gigas with nitrite as the electron acceptor proceeds at the ratio of 1 mol protoporphyrin produced for each mol of nitrite reduced. Coupled to the protoporphyrinogen-nitrite reaction is the esterification of ortho-phosphate with a P/2e− value of 0.92. Pentachlorophenol, 3 × 10−5 M, and carbonyl cyanide m-chlorophenyl hydrazone, 3 × 10−6 M, serve as uncouplers of phosphorylation while rotenone, 9 × 10−6 M, and hydroxyquinoline-N-oxide, 0.1 × 10−6 M, inhibit electron flow from protoporphyrinogen oxidase to nitrite reductase.