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- W4214882100 abstract "Ceruloplasmin is a multicopper oxidase essential for normal iron homeostasis. To elucidate the mechanisms of copper incorporation into this protein, holoceruloplasmin biosynthesis was examined by immunoblot analysis and (64)Cu metabolic labeling of Chinese hamster ovary cells transfected with cDNAs encoding wild-type or mutant ceruloplasmin. This analysis reveals that the incorporation of copper into newly synthesized apoceruloplasmin in vivo results in a detectable conformational change in the protein. Strikingly, despite the unique functional role of each copper site within ceruloplasmin, metabolic studies indicate that achieving this final conformation-driven state requires the occupation of all six copper-binding sites with no apparent hierarchy for copper incorporation at any given site. Consistent with these findings a missense mutation (G631R), resulting in aceruloplasminemia and predicted to alter the interactions at a single type I copper-binding site, results in the synthesis and secretion only of apoceruloplasmin. Analysis of copper incorporation into apoceruloplasmin in vitro reveals that this process is cooperative and that the failure of copper incorporation into copper-binding site mutants observed in vivo is intrinsic to the mutant proteins. These findings reveal a precise and sensitive mechanism for the formation of holoceruloplasmin under the limiting conditions of copper availability within the cell that may be generally applicable to the biosynthesis of cuproproteins within the secretory pathway. PMID: 12351628 Funding information This work was supported by: NIDDK NIH HHS, United States Grant ID: DK 61763" @default.
- W4214882100 created "2022-03-05" @default.
- W4214882100 creator A5000721117 @default.
- W4214882100 date "2002-10-10" @default.
- W4214882100 modified "2023-09-23" @default.
- W4214882100 title "Faculty Opinions recommendation of Mechanisms of copper incorporation into human ceruloplasmin." @default.
- W4214882100 doi "https://doi.org/10.3410/f.1009841.136658" @default.
- W4214882100 hasPublicationYear "2002" @default.
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