1rk7
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Solution structure of apo Cu,Zn Superoxide Dismutase: role of metal ions in protein folding
OverviewOverview
The solution structure of the demetalated copper, zinc superoxide dismutase is obtained for the monomeric Glu133Gln/Phe50Glu/Gly51Glu mutant through NMR spectroscopy. The demetalated protein still has a well-defined tertiary structure; however, two beta-strands containing two copper ligands (His46 and His48, beta4) and one zinc ligand (Asp83, beta5) are shortened, and the sheet formed by these strands and strands beta7 and beta8 moves away from the other strands of the beta-barrel to form an open clam with respect to a closed conformation in the holoprotein. Furthermore, loop IV which contains three zinc ligands (His63, His71, and His80) and loop VII which contributes to the definition of the active cavity channel are severely disordered, and experience extensive mobility as it results from thorough (15)N relaxation measurements. These structural and mobility data, if compared with those of the copper-depleted protein and holoprotein, point out the role of each metal ion in the protein folding, leading to the final tertiary structure of the holoprotein, and provide hints for the mechanisms of metal delivery by metal chaperones.
DiseaseDisease
Known disease associated with this structure: Amyotrophic lateral sclerosis, due to SOD1 deficiency OMIM:[147450]
About this StructureAbout this Structure
1RK7 is a Single protein structure of sequence from Homo sapiens. Active as Superoxide dismutase, with EC number 1.15.1.1 Full crystallographic information is available from OCA.
ReferenceReference
Solution structure of Apo Cu,Zn superoxide dismutase: role of metal ions in protein folding., Banci L, Bertini I, Cramaro F, Del Conte R, Viezzoli MS, Biochemistry. 2003 Aug 19;42(32):9543-53. PMID:12911296
Page seeded by OCA on Thu Feb 21 14:51:49 2008