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• W1987459562 endingPage "585" @default.
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• W1987459562 abstract "The periplasmic heme chaperone holoCcmE is essential for heme trafficking in the cytochrome c biosynthetic pathway in many bacteria, archaea, and plant mitochondria. This pathway, called system I, involves two steps: (i) formation and release of holoCcmE (by the ABC-transporter complex CcmABCD) and (ii) delivery of the heme in holoCcmE to the putative cytochrome c heme lyase complex, CcmFH. CcmFH is believed to facilitate the final covalent attachment of heme (from holoCcmE) to the apocytochrome c. Although most models for system I propose that holoCcmE delivers heme directly to CcmF, no interaction between holoCcmE and CcmF has been demonstrated. Here, a complex between holoCcmE and CcmF is “trapped”, purified, and characterized. HoloCcmE must be released from the ABC-transporter complex CcmABCD to interact with CcmF, and the holo-form of CcmE interacts with CcmF at levels at least 20-fold higher than apoCcmE. Two conserved histidines (here termed P-His1 and P-His2) in separate periplasmic loops in CcmF are required for interaction with holoCcmE, and evidence that P-His1 and P-His2 function as heme-binding ligands is presented. These results show that heme in holoCcmE is essential for complex formation with CcmF and that the heme of holoCcmE is coordinated by P-His1 and P-His2 within the WWD domain of CcmF. These features are strikingly similar to formation of the CcmC:heme:CcmE ternary complex [Richard-Fogal C, Kranz RG. The CcmC:heme:CcmE complex in heme trafficking and cytochrome c biosynthesis. J Mol Biol 2010;401:350–62] and suggest common mechanistic and structural aspects." @default.
• W1987459562 created "2016-06-24" @default.
• W1987459562 creator A5052123021 @default.
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• W1987459562 date "2014-02-01" @default.
• W1987459562 modified "2023-10-17" @default.
• W1987459562 title "Interaction of HoloCcmE with CcmF in Heme Trafficking and Cytochrome c Biosynthesis" @default.
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• W1987459562 doi "https://doi.org/10.1016/j.jmb.2013.10.025" @default.
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