2lgq
Human C30S/C59S-Cox17 mutant
Structural highlights
FunctionCOX17_HUMAN Copper chaperone for cytochrome c oxidase (COX). Binds two copper ions and deliver them to the Cu(A) site of COX (By similarity). Publication Abstract from PubMedHuman Cox17 is the mitochondrial copper chaperone responsible for supplying copper ions, through the assistance of Sco1, Sco2, and Cox11, to cytochrome c oxidase, the terminal enzyme of the mitochondrial energy-transducing respiratory chain. It consists of a coiled coil-helix-coiled coil-helix domain stabilized by two disulfide bonds and binds one copper(I) ion through a Cys-Cys motif. Here, the structures and the backbone mobilities of two Cox17 mutated forms with only one interhelical disulfide bond have been analyzed. It appears that the inner disulfide bond (formed by Cys-36 and Cys-45) stabilizes interhelical hydrophobic interactions, providing a structure with essentially the same structural dynamic properties of the mature Cox17 state. On the contrary, the external disulfide bond (formed by Cys-26 and Cys-55) generates a conformationally flexible alpha-helical protein, indicating that it is not able to stabilize interhelical packing contacts, but is important for structurally organizing the copper-binding site region. Functional role of two interhelical disulfide bonds in human cox17 protein from a structural perspective.,Banci L, Bertini I, Cefaro C, Ciofi-Baffoni S, Gallo A J Biol Chem. 2011 Sep 30;286(39):34382-90. Epub 2011 Aug 4. PMID:21816817[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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