Protein
NADPH-Fe(3+) oxidoreductase subunit alpha
Organism
Geobacter sulfurreducens (strain ATCC 51573 / DSM 12127 / PCA)
Function
NADPH-dependent Fe(3+) reductase. Probably involved in acetate metabolism and not in the reduction of Fe(3+) chelates. Unable to utilize NADH or formate as electron donors. Unlike formate dehydrogenases, contains no W, Mo or Se. Substrates are Fe(3+)-nitrilotriacetate >> Fe(3+)-citrate or Fe(3+)-EDTA > Fe(3+)-oxyhydroxide. Catalyzes also the reduction of NADP(+) with reduced methyl viologen as electron donor. No activity with menadione as electron acceptor. May be alternatively involved in transferring electrons from reduced ferredoxin to NADP(+) and may serve as a major route for NADP regeneration.
Sequence
MVSLTIDGKDITVAKETTILDAAALLGITIPTLCWLKKVSPTGACRVCAVEIEGVDRPMTACNTPVKDGIKVTTQSEKLSRIRQKIMELMLVNHPLDCPVCDAGGECDLQNACYGLGAAKQEYGAVLERRKIRYDWPLIESDPNRCILCEKCVKVDHEIVGCNAIRVVNRGEATIIDTVDGNPLNCEFCGNCVAACPTGTLISKPFKFRGRPWAFTTTPSVCPFCATGCQIEYHSRNGRVERVTSDDSTYNSGNLCINGRFGYSYINSPDRLAEPMVKGQKADWNTAMGTAATALKQIVASHGADAVAGFGSPRVTNEDNYLFQKLMRSAIGTGNIDSEARLGFAATQKVLREMLGIAGASTTIDAIDRATAVLVVGCDLNAEATGMEYRVIKAATKNNAKLVLAAMRDIKLKKFANSHLKYRPGNETLLINALTKAVLEEGLENKEFCSANISNLSDLTAALAGVSIADAAAATGVTEADLRAAARLVGGKKGVAVIFGAELMRGGNTDAVKALINLALILGATAGDTGGLFPVYEKTNIRGLLDMGVAPDHFPGHQTDGTTFEKAWGKKLPAAAGKDLWQIIEGIEQGSVKALYLLGCDPVASFPEGERIRKALEKLELLIVQDPFPGEAAKMAHVVFPSSVAAEKNGTFTTIDGRVQPLAKAVAPSGDAREDWDILTELYNRLTGESRIHSPAAVLDEVAALVPAYASVGRTGGTITAQPRSGGLALAPVSARAVAGSPTTLLVGTILYHSGTTTTWSKNNLEIIPKGYIEIHPNDAAKLGIAEGGKVRLSAGSVKVEGTAKITPRVQPGLLFAPSHFRGMNVNALLSRDGGVVPVTVEKA