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ccmH | Heme lyase, CcmH subunit; May be required for the biogenesis of c-type cytochromes. Possible subunit of a heme lyase. (350 aa) | ||||
dsbE | Periplasmic thioredoxin of cytochrome c-type biogenesis; Involved in disulfide bond formation. Catalyzes a late, reductive step in the assembly of periplasmic c-type cytochromes, probably the reduction of disulfide bonds of the apocytochrome c to allow covalent linkage with the heme. Possible subunit of a heme lyase. DsbE is maintained in a reduced state by DsbD. (185 aa) | ||||
ccmF | Heme lyase, CcmF subunit; Required for the biogenesis of c-type cytochromes. Possible subunit of a heme lyase. (647 aa) | ||||
ccmE | Periplasmic heme chaperone; Heme chaperone required for the biogenesis of c-type cytochromes. Transiently binds heme delivered by CcmC and transfers the heme to apo-cytochromes in a process facilitated by CcmF and CcmH; Belongs to the CcmE/CycJ family. (159 aa) | ||||
ccmD | Cytochrome c biogenesis protein; Required for the export of heme to the periplasm for the biogenesis of c-type cytochromes. (69 aa) | ||||
ccmC | Heme export ABC transporter permease; Required for the export of heme to the periplasm for the biogenesis of c-type cytochromes. (245 aa) | ||||
ccmB | Heme export ABC transporter permease; Required for the export of heme to the periplasm for the biogenesis of c-type cytochromes. (220 aa) | ||||
ccmA | Heme export ABC transporter ATPase; Part of the ABC transporter complex CcmAB involved in the biogenesis of c-type cytochromes; once thought to export heme, this seems not to be the case, but its exact role is uncertain. Responsible for energy coupling to the transport system. (207 aa) | ||||
napC | Quinol dehydrogenase, electron source for NapAB; Mediates electron flow from quinones to the NapAB complex. (200 aa) | ||||
napB | Nitrate reductase, small, cytochrome C550 subunit, periplasmic; Electron transfer subunit of the periplasmic nitrate reductase complex NapAB. Receives electrons from the membrane-anchored tetraheme c-type NapC protein and transfers these to NapA subunit, thus allowing electron flow between membrane and periplasm. Essential for periplasmic nitrate reduction with nitrate as the terminal electron acceptor; Belongs to the NapB family. (149 aa) | ||||
napH | Ferredoxin-type protein; Required for electron transfer from ubiquinol, via NapC, to the periplasmic nitrate reductase NapAB complex. (287 aa) | ||||
napG | Ferredoxin-type protein; Required for electron transfer from ubiquinol, via NapC, to the periplasmic nitrate reductase NapAB complex. (231 aa) | ||||
napA | Nitrate reductase, periplasmic, large subunit; Catalytic subunit of the periplasmic nitrate reductase complex NapAB. Receives electrons from NapB and catalyzes the reduction of nitrate to nitrite; Belongs to the prokaryotic molybdopterin-containing oxidoreductase family. NasA/NapA/NarB subfamily. (828 aa) | ||||
napD | Assembly protein for periplasmic nitrate reductase; Chaperone for NapA, the catalytic subunit of the periplasmic nitrate reductase. It binds directly and specifically to the twin- arginine signal peptide of NapA, preventing premature interaction with the Tat translocase and premature export. May have a role in the insertion of the NapA molybdenum cofactor. (87 aa) | ||||
napF | Ferredoxin-type protein, role in electron transfer to periplasmic nitrate reductase NapA; Could be involved in the maturation of NapA, the catalytic subunit of the periplasmic nitrate reductase, before its export into the periplasm. Is not involved in the electron transfer from menaquinol or ubiquinol to the periplasmic nitrate reductase. (164 aa) | ||||
nrfA | Nitrite reductase, formate-dependent, cytochrome; Catalyzes the reduction of nitrite to ammonia, consuming six electrons in the process. Has very low activity toward hydroxylamine. Has even lower activity toward sulfite. Sulfite reductase activity is maximal at neutral pH (By similarity). (478 aa) | ||||
nrfB | Nitrite reductase, formate-dependent, penta-heme cytochrome c; Plays a role in nitrite reduction. (188 aa) | ||||
nrfC | Formate-dependent nitrite reductase, 4Fe4S subunit; Probably involved in the transfer of electrons from the quinone pool to the type-c cytochromes. (223 aa) | ||||
nrfD | Formate-dependent nitrite reductase, membrane subunit; Probably involved in the transfer of electrons from the quinone pool to the type-c cytochromes; Belongs to the NrfD family. (318 aa) | ||||
nrfE | Heme lyase (NrfEFG) for insertion of heme into c552, subunit NrfE; May be required for the biogenesis of c-type cytochromes. Possible subunit of a heme lyase. (552 aa) | ||||
nrfF | Heme lyase (NrfEFG) for insertion of heme into c552, subunit NrfF; Not required for the biosynthesis of any of the c-type cytochromes. Possible subunit of a heme lyase. (127 aa) | ||||
nrfG | Heme lyase (NrfEFG) for insertion of heme into c552, subunit NrfG; Required for formate-dependent nitrite reduction. Not required for the biosynthesis of any of the c-type cytochromes nor for the secretion of the periplasmic cytochromes. (198 aa) |