Table 6.

Well-characterized Paracoccus c-type cytochromes

CytochromecMol mass (kDa)No. of c heme centersGeneRole or probable role
Cytochromec550141cycAGeneral periplasmic electron carrier
Cytochromec145a1fbcCComponent of bc1 complex
Cytochromec552221cycMElectron donor toaa3-type cytochrome oxidase
Cytochromec551i181mxaGElectron acceptor for MDH
Cytochromec553i231cycBPutative electron carrier during methylotrophic growth
Cytochromec551 (putative)402soxDElectron transport during growth on thiosulfate
Cytochrome cperoxidase422Removal of hydrogen peroxide from the periplasm
Cytochromecd1651nirSNitrite reductase
CcoO301ccoOComponent ofcbb3-type cytochrome oxidase
CcoP452ccoPComponent ofcbb3-type cytochrome oxidase
MauG402mauGSynthesis of prosthetic group of MADH
NapB152napBComponent of periplasmic nitrate reductase
NapC274napCNirT homologue, electron donor to periplasmic nitrate reductase
NorC141norCComponent of nitric oxide reductase
SoxE261soxEElectron transport during growth on thiosulfate
  • a Cytochrome c1migrates with an apparent molecular mass of 60 to 68 kDa on sodium dodecyl sulfate-polyacrylamide gel electrophoresis.