The interplay between the disulfide bond formation pathway and cytochrome c maturation in Escherichia coli.

The interplay between the disulfide bond formation pathway and cytochrome c maturation in Escherichia coli.
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DOI:
10.1016/j.febslet.2012.04.055
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发表时间:
2012-06-12
期刊:
影响因子:
3.5
通讯作者:
Stevens JM
Stevens JM
中科院分区:
生物学3区
文献类型:
--
作者:
Mavridou DA;Ferguson SJ;Stevens JM

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► The role of DsbA and DsbD in cytochrome c maturation in E. coli was probed. ► DsbA is not essential for holocytochrome c production. ► DsbD is important but not essential for cytochrome c maturation. ► A model is proposed for cytochrome c biosynthesis in the periplasm of E. coli. ► Heme attachment to and oxidation of the apocytochrome are competing processes. Heme attachment to c-type cytochromes in bacteria requires cysteine thiols in the CXXCH motif of the protein. The involvement of the periplasmic disulfide generation system in this process remains unclear. We undertake a systematic evaluation of the role of DsbA and DsbD in cytochrome c biogenesis in Escherichia coli and show unequivocally that DsbA is not essential for holocytochrome production under aerobic or anaerobic conditions. We also prove that DsbD is important but not essential for maturation of c-type cytochromes. We discuss the findings in the context of a model in which heme attachment to, and oxidation of, the apocytochrome are competing processes.
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