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-Structure paper
Title | Monomer and dimer structures of cytochrome bo ubiquinol oxidase from Escherichia coli. |
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Journal, issue, pages | Protein Sci, Vol. 32, Issue 4, Page e4616, Year 2023 |
Publish date | Apr 3, 2023 |
Authors | Yirui Guo / Elina Karimullina / Tabitha Emde / Zbyszek Otwinowski / Dominika Borek / Alexei Savchenko / |
PubMed Abstract | The Escherichia coli cytochrome bo ubiquinol oxidase is a four-subunit heme-copper oxidase that serves as a proton pump in the E. coli aerobic respiratory chain. Despite many mechanistic studies, it ...The Escherichia coli cytochrome bo ubiquinol oxidase is a four-subunit heme-copper oxidase that serves as a proton pump in the E. coli aerobic respiratory chain. Despite many mechanistic studies, it is unclear whether this ubiquinol oxidase functions as a monomer, or as a dimer in a manner similar to its eukaryotic counterparts-the mitochondrial electron transport complexes. In this study, we determined the monomeric and dimeric structures of the E. coli cytochrome bo ubiquinol oxidase reconstituted in amphipol by cryogenic electron microscopy single particle reconstruction (cryo-EM SPR) to a resolution of 3.15 and 3.46 Å, respectively. We have discovered that the protein can form a dimer with C2 symmetry, with the dimerization interface maintained by interactions between the subunit II of one monomer and the subunit IV of the other monomer. Moreover, the dimerization does not induce significant structural changes in the monomers, except the movement of a loop in subunit IV (residues 67-74). |
External links | Protein Sci / PubMed:36880269 / PubMed Central |
Methods | EM (single particle) |
Resolution | 3.15 - 3.46 Å |
Structure data | EMDB-28877, PDB-8f68: EMDB-28879, PDB-8f6c: |
Chemicals | ChemComp-HEM: ChemComp-HEO: ChemComp-CU: ChemComp-3PE: |
Source |
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Keywords | PROTON TRANSPORT / heme-copper oxidase / proton translocation / E. coli aerobic respiratory chain / membrane protein |