DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Structure of the cytochrome aa 3 -600 heme-copper menaquinol oxidase bound to inhibitor HQNO shows TM0 is part of the quinol binding site

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [2];  [3];  [2];  [3];  [3];  [3];  [4];  [4]; ORCiD logo [5];  [2]; ORCiD logo [3]
  1. Nanjing University of Chinese Medicine (China); Nanjing University of Chinese Medicine
  2. Univ. of Illinois at Urbana-Champaign, IL (United States)
  3. Nanjing University of Chinese Medicine (China)
  4. PharmaBlock Sciences, Inc., Nanjing, China
  5. Shanghai Jiao Tong Univ. (China). School of Medicine

Virtually all proton-pumping terminal respiratory oxygen reductases are members of the heme-copper oxidoreductase superfamily. Most of these enzymes use reduced cytochrome c as a source of electrons, but a group of enzymes have evolved to directly oxidize membrane-bound quinols, usually menaquinol or ubiquinol. All of the quinol oxidases have an additional transmembrane helix (TM0) in subunit I that is not present in the related cytochrome c oxidases. The current work reports the 3.6-Å-resolution X-ray structure of the cytochrome aa3-600 menaquinol oxidase from Bacillus subtilis containing 1 equivalent of menaquinone. The structure shows that TM0 forms part of a cleft to accommodate the menaquinol-7 substrate. Crystals which have been soaked with the quinol-analog inhibitor HQNO (N-oxo-2-heptyl-4-hydroxyquinoline) or 3-iodo-HQNO reveal a single binding site where the inhibitor forms hydrogen bonds to amino acid residues shown previously by spectroscopic methods to interact with the semiquinone state of menaquinone, a catalytic intermediate.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-87ER13716
OSTI ID:
1800648
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 2 Vol. 117; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English

References (34)

CHARMM-GUI Membrane Builder toward realistic biological membrane simulations journal August 2014
Diversity of the Heme–Copper Superfamily in Archaea: Insights from Genomics and Structural Modeling book January 2008
Cytochrome c oxidase: exciting progress and remaining mysteries journal October 2008
The sequence of the cyo operon indicates substantial structural similarities between the cytochrome o ubiquinol oxidase of Escherichia coli and the aa3-type family of cytochrome c oxidases. journal July 1990
The quinone-binding sites of the cytochrome bo3 ubiquinol oxidase from Escherichia coli journal December 2010
Characterization of the semiquinone radical stabilized by the cytochrome aa3-600 menaquinol oxidase of Bacillus subtilis journal July 2010
The superfamily of heme–copper oxygen reductases: Types and evolutionary considerations journal April 2012
Exploring membrane respiratory chains journal August 2016
Searching for the low affinity ubiquinone binding site in cytochrome bo3 from Escherichia coli journal May 2017
Single-step production of arabino-xylooligosaccharides by recombinant Bacillus subtilis 3610 cultivated in brewers’ spent grain journal November 2018
Plasticity in the High Affinity Menaquinone Binding Site of the Cytochrome aa 3 -600 Menaquinol Oxidase from Bacillus subtilis journal August 2015
Q-Band Electron-Nuclear Double Resonance Reveals Out-of-Plane Hydrogen Bonds Stabilize an Anionic Ubisemiquinone in Cytochrome bo 3 from Escherichia coli journal September 2016
Transient-State Reduction and Steady-State Kinetic Studies of Menaquinol Oxidase from Bacillus subtilis , Cytochrome aa 3 -600 nm. Spectroscopic Characterization of the Steady-State Species journal November 2001
Identification of the Residues Involved in Stabilization of the Semiquinone Radical in the High-Affinity Ubiquinone Binding Site in Cytochrome bo 3 from Escherichia coli by Site-Directed Mutagenesis and EPR Spectroscopy journal August 2002
Interactions of Intermediate Semiquinone with Surrounding Protein Residues at the Q H Site of Wild-Type and D75H Mutant Cytochrome bo 3 from Escherichia coli journal April 2012
Redox-Dependent Conformational Changes in Cytochrome c Oxidase Suggest a Gating Mechanism for Proton Uptake journal June 2009
Electron Transfer Kinetics during the Reduction and Turnover of the Cytochrome caa 3 Complex from Bacillus subtilis journal June 1998
Identification of the Nitrogen Donor Hydrogen Bonded with the Semiquinone at the Q H Site of the Cytochrome bo 3 from Escherichia coli journal November 2008
Location of the Substrate Binding Site of the Cytochrome bo 3 Ubiquinol Oxidase from Escherichia coli journal June 2017
Structure at 2.8 Å resolution of cytochrome c oxidase from Paracoccus denitrificans journal August 1995
Structural insights into electron transfer in caa3-type cytochrome oxidase journal July 2012
Crystal structure of heme A synthase from Bacillus subtilis journal November 2018
The roles of the two proton input channels in cytochrome c oxidase from Rhodobacter sphaeroides probed by the effects of site-directed mutations on time-resolved electrogenic intraprotein proton transfer journal August 1997
Characterization of the Semiquinone Radical Stabilized by the Cytochrome aa3-600 Menaquinol Oxidase of Bacillus subtilis journal June 2010
Exploring by Pulsed EPR the Electronic Structure of Ubisemiquinone Bound at the QH Site of Cytochrome bo3 from Escherichia coli with in Vivo 13C-Labeled Methyl and Methoxy Substituents* journal March 2011
Characterization of the Exchangeable Protons in the Immediate Vicinity of the Semiquinone Radical at the QH Site of the Cytochrome bo3 from Escherichia coli journal June 2006
Phaser crystallographic software journal July 2007
PHENIX: a comprehensive Python-based system for macromolecular structure solution journal January 2010
Features and development of Coot journal March 2010
iMOSFLM : a new graphical interface for diffraction-image processing with MOSFLM journal March 2011
The Structure of cbb3 Cytochrome Oxidase Provides Insights into Proton Pumping journal June 2010
The Whole Structure of the 13-Subunit Oxidized Cytochrome c Oxidase at 2.8 A journal May 1996
High Resolution Structure of the ba3 Cytochrome c Oxidase from Thermus thermophilus in a Lipidic Environment journal July 2011
PHENIX: a comprehensive Python-based system for macromolecular structure solution. text January 2010