Abstract
The copper chaperone for superoxide dismutase (CCS) activates the eukaryotic antioxidant enzyme copper, zinc superoxide dismutase (SOD1). The 2.9 Å resolution structure of yeast SOD1 complexed with yeast CCS (yCCS) reveals that SOD1 interacts with its metallochaperone to form a complex comprising one monomer of each protein. The heterodimer interface is remarkably similar to the SOD1 and yCCS homodimer interfaces. Striking conformational rearrangements are observed in both the chaperone and target enzyme upon complex formation, and the functionally essential C-terminal domain of yCCS is well positioned to play a key role in the metal ion transfer mechanism. This domain is linked to SOD1 by an intermolecular disulfide bond that may facilitate or regulate copper delivery.
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Acknowledgements
This work was supported by an NIH grant to A.C.R., by a grant from the ALS Association to A.C.R. and by an NIH NRSA Fellowship to A.L.L. The DND-CAT Synchrotron Research Center at the Advanced Photon Source is supported by the E.I. DuPont de Nemours & Co., the Dow Chemical Co., the State of Illinois, the U. S. Department of Energy and the NSF.
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Lamb, A., Torres, A., O'Halloran, T. et al. Heterodimeric structure of superoxide dismutase in complex with its metallochaperone. Nat Struct Mol Biol 8, 751–755 (2001). https://doi.org/10.1038/nsb0901-751
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DOI: https://doi.org/10.1038/nsb0901-751
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