کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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2049830 | 1074144 | 2008 | 8 صفحه PDF | دانلود رایگان |
In the process of cytochrome c maturation, heme groups are covalently attached to reduced cysteines of specific heme-binding motifs (CXXCH) in an apocytochrome c sequence. In Escherichia coli, the CcmH protein maintains apo-protein cysteines in a reduced state prior to heme attachment. We have purified and biophysically, as well as structurally characterized the soluble, N-terminal domain of E. coli CcmH that carries the functionally relevant LRCXXC-motif. In contrast to a recently presented structure of the homologous domain from Pseudomonas aeruginosa, the E. coli protein forms a tightly interlinked dimer by swapping its N-terminal helix between two monomers. We propose that an altered environment of the functional motif may help to discern between the two redox partners CcmG and apocytochrome c.
Journal: FEBS Letters - Volume 582, Issue 18, 6 August 2008, Pages 2779–2786