7z10

Monomeric respiratory complex IV isolated from S. cerevisiae

spinqualitylabelsall models 7z10, resolution 3.87Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7z10 is a 9 chain structure with sequence from Saccharomyces cerevisiae S288C. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.87Å Ligands: CU, CUA, HEA, MG, PEF, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function COX1_YEAST Cytochrome c oxidase is the component of the respiratory chain that catalyzes the reduction of oxygen to water. Subunits 1-3 form the functional core of the enzyme complex. CO I is the catalytic subunit of the enzyme. Electrons originating in cytochrome c are transferred via the copper A center of subunit 2 and heme A of subunit 1 to the bimetallic center formed by heme A3 and copper B. Publication Abstract from PubMed In mitochondria, complex IV (CIV) can be found as a monomer, a dimer or in association with other respiratory complexes. The atomic structure of the yeast S. cerevisiae CIV in a supercomplex (SC) with complex III (CIII) pointed to a region of significant conformational changes compared to the homologous mammalian CIV structures. These changes involved the matrix side domain of Cox5A at the CIII-CIV interface, and it was suggested that it could be required for SC formation. To investigate this, we solved the structure of the isolated monomeric CIV from S. cerevisiae stabilised in amphipol A8-35 at 3.9 A using cryo-electron microscopy. Only a minor change in flexibility was seen in this Cox5A region, ruling out large CIV conformational shift for interaction with CIII and confirming the different fold of the yeast Cox5A subunit compared to mammalian homologues. Other differences in structure were the absence of two canonical subunits, Cox12 and Cox13, as well as Cox26, which is unique to the yeast CIV. Their absence is most likely due to the protein purification protocol used to isolate CIV from the III-IV SC. Cryo-EM structure of a monomeric yeast S. cerevisiae complex IV isolated with maltosides: Implications in supercomplex formation.,Ing G, Hartley AM, Pinotsis N, Marechal A Biochim Biophys Acta Bioenerg. 2022 Oct 1;1863(7):148591. doi: , 10.1016/j.bbabio.2022.148591. Epub 2022 Jul 14. PMID:35839926 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cytochrome c oxidase 3D structures

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