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Title: Monomer and dimer structures of cytochrome bo 3 ubiquinol oxidase from Escherichia coli

Abstract

Abstract The Escherichia coli cytochrome bo 3 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 3 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).

Authors:
 [1];  [2];  [3];  [4]; ORCiD logo [4]; ORCiD logo [5]
  1. Department of Biophysics The University of Texas Southwestern Medical Center Dallas Texas USA, Ligo Analytics Dallas Texas USA
  2. Department of Microbiology, Immunology and Infectious Diseases University of Calgary Calgary Alberta Canada, Center for Structural Genomics of Infectious Diseases (CSGID) Chicago Illinois USA, Centers for Research on Structural Biology of Infectious Diseases (CSBID) Chicago Illinois USA
  3. Department of Biophysics The University of Texas Southwestern Medical Center Dallas Texas USA, Center for Structural Genomics of Infectious Diseases (CSGID) Chicago Illinois USA, Centers for Research on Structural Biology of Infectious Diseases (CSBID) Chicago Illinois USA
  4. Department of Biophysics The University of Texas Southwestern Medical Center Dallas Texas USA, Center for Structural Genomics of Infectious Diseases (CSGID) Chicago Illinois USA, Centers for Research on Structural Biology of Infectious Diseases (CSBID) Chicago Illinois USA, Department of Biochemistry The University of Texas Southwestern Medical Center Dallas Texas USA
  5. Department of Microbiology, Immunology and Infectious Diseases University of Calgary Calgary Alberta Canada, Center for Structural Genomics of Infectious Diseases (CSGID) Chicago Illinois USA, Centers for Research on Structural Biology of Infectious Diseases (CSBID) Chicago Illinois USA, BioZone, Department of Chemical Engineering and Applied Chemistry University of Toronto Toronto Ontario Canada
Publication Date:
Research Org.:
Ligo Analytics, Dallas, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Cancer Prevention and Research Institute of Texas; National Institutes of Health (NIH)
OSTI Identifier:
1963319
Alternate Identifier(s):
OSTI ID: 1963321; OSTI ID: 1987657
Grant/Contract Number:  
DE‐SC0019600; DE‐SC0021600; SC0019600; SC0021600; RP170644; RP220582; 75N93022C00035; HHSN272201700060C; R35GM145365
Resource Type:
Published Article
Journal Name:
Protein Science
Additional Journal Information:
Journal Name: Protein Science Journal Volume: 32 Journal Issue: 4; Journal ID: ISSN 0961-8368
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
United Kingdom
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; cryo-EM; cryogenic electron microscopy; dimer; E. coli cytochrome bo3 ubiquinol oxidase

Citation Formats

Guo, Yirui, Karimullina, Elina, Emde, Tabitha, Otwinowski, Zbyszek, Borek, Dominika, and Savchenko, Alexei. Monomer and dimer structures of cytochrome bo 3 ubiquinol oxidase from Escherichia coli. United Kingdom: N. p., 2023. Web. doi:10.1002/pro.4616.
Guo, Yirui, Karimullina, Elina, Emde, Tabitha, Otwinowski, Zbyszek, Borek, Dominika, & Savchenko, Alexei. Monomer and dimer structures of cytochrome bo 3 ubiquinol oxidase from Escherichia coli. United Kingdom. https://doi.org/10.1002/pro.4616
Guo, Yirui, Karimullina, Elina, Emde, Tabitha, Otwinowski, Zbyszek, Borek, Dominika, and Savchenko, Alexei. Fri . "Monomer and dimer structures of cytochrome bo 3 ubiquinol oxidase from Escherichia coli". United Kingdom. https://doi.org/10.1002/pro.4616.
@article{osti_1963319,
title = {Monomer and dimer structures of cytochrome bo 3 ubiquinol oxidase from Escherichia coli},
author = {Guo, Yirui and Karimullina, Elina and Emde, Tabitha and Otwinowski, Zbyszek and Borek, Dominika and Savchenko, Alexei},
abstractNote = {Abstract The Escherichia coli cytochrome bo 3 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 3 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).},
doi = {10.1002/pro.4616},
journal = {Protein Science},
number = 4,
volume = 32,
place = {United Kingdom},
year = {Fri Mar 24 00:00:00 EDT 2023},
month = {Fri Mar 24 00:00:00 EDT 2023}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1002/pro.4616

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