1.14.99.58 heme + 3 AH2 + 3 O2 - 1.14.99.58 heme + 3 AH2 + 3 O2 natural electron donor for PigA from Pseudomonas aeruginosa PAO1 is ferredoxin-NADP+-oxidoreductase 1.14.99.58 additional information BphO, a heme oxygenase, produces the linear tetrapyrrole chromophore biliverdin IXa, potential protective role of the BphO reaction product biliverdin, overview 1.14.99.58 additional information the organism contains only one enzyme type: PigA. PigA produces the biliverdin isomer IXalpha 1.14.99.58 additional information the organism contains two heme oxygenases with different regiospecificities: BphO and PigA. While BphO cleaves heme to exclusively yield biliverdin IXalpha, PigA produces the biliverdin isomers IXbeta and IXdelta 1.14.99.58 protoheme + reduced acceptor + O2 -