3zk0

The crystal structure of a Cu(I) metallochaperone from Streptomyces lividans in its apo form

spinqualitylabelsall models 3zk0, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3zk0 is a 1 chain structure with sequence from Streptomyces lividans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.7Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q93J41_STRCO Publication Abstract from PubMed In Streptomyces lividans an extracytoplasmic copper-binding Sco protein plays a role in two unlinked processes: (i) initiating a morphological development switch and (ii) facilitating the co-factoring of the CuA domain of CcO (cytochrome c oxidase). How Sco obtains copper once secreted to the extracytoplasmic environment is unknown. In the present paper we report on a protein possessing an HX6MX21HXM motif that binds a single cuprous ion with subfemtomolar affinity. High-resolution X-ray structures of this extracytoplasmic copper chaperone-like protein (ECuC) in the apo- and Cu(I)-bound states reveal that the latter possesses a surface-accessible cuprous-ion-binding site located in a dish-shaped region of beta-sheet structure. A cuprous ion is transferred under a favourable thermodynamic gradient from ECuC to Sco with no back transfer occurring. The ionization properties of the cysteine residues in the Cys86xxxCys90 copper-binding motif of Sco, together with their positional locations identified from an X-ray structure of Sco, suggests a role for Cys86 in initiating an inter-complex ligand-exchange reaction with Cu(I)-ECuC. Generation of the genetic knockouts, Deltasco, Deltaecuc and Deltasco/ecuc, and subsequent in vivo assays lend support to the existence of a branched extracytoplasmic copper-trafficking pathway in S. lividans. One branch requires both Sco and to a certain extent ECuC to cofactor the CuA domain, whereas the other uses only Sco to deliver copper to a cuproenzyme to initiate morphological development. Structural and mechanistic insights into an extracytoplasmic copper trafficking pathway in Streptomyces lividans.,Blundell KL, Hough MA, Vijgenboom E, Worrall JA Biochem J. 2014 May 1;459(3):525-38. doi: 10.1042/BJ20140017. PMID:24548299 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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