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Overproduction of CcmABCDEFGH restores cytochrome c maturation in a DsbD deletion strain of E. coli : another route for reductant?
Author(s) -
Stevens Julie M.,
Gordon Euan H.,
Ferguson Stuart J.
Publication year - 2004
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2004.08.067
Subject(s) - periplasmic space , overproduction , escherichia coli , cytochrome , biochemistry , strain (injury) , cytochrome c , chemistry , transmembrane protein , biology , enzyme , gene , mitochondrion , receptor , anatomy
The multidomain transmembrane protein DsbD is essential for cytochrome c maturation (Ccm) in Escherichia coli and transports reductant to the otherwise oxidising environment of the bacterial periplasm. The Ccm proteins ABCDEFGH are also essential and we show that the overproduction of these proteins can unexpectedly complement for the absence of DsbD in a deletion strain by partially restoring the production of an exogenous c ‐type cytochrome under aerobic and anaerobic conditions. This suggests that one or more of the Ccm proteins can provide reductant to the periplasm. The Ccm proteins do not, however, restore the normal disulfide mis‐isomerisation phenotype of the deletion strain, as shown by assay of the multidisulfide‐bonded enzyme urokinase.