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- EMDB-16041: CryoEM structure of quinol-dependent Nitric Oxide Reductase (qNOR... -
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Open data
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Basic information
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Title | CryoEM structure of quinol-dependent Nitric Oxide Reductase (qNOR) from Alcaligenes xylosoxidans at 2.2 A resolution | |||||||||
![]() | main map used for model building | |||||||||
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![]() | quinol-dependent Nitric Oxide Reductase / proton transfer / ![]() ![]() ![]() | |||||||||
Function / homology | ![]() ![]() ![]() ![]() ![]() ![]() Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | ![]() ![]() | |||||||||
![]() | Flynn A / Antonyuk SV / Eady RR / Muench SP / Hasnain SS | |||||||||
Funding support | ![]()
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![]() | ![]() Title: A 2.2 Å cryoEM structure of a quinol-dependent NO Reductase shows close similarity to respiratory oxidases. Authors: Alex J Flynn / Svetlana V Antonyuk / Robert R Eady / Stephen P Muench / S Samar Hasnain / ![]() Abstract: Quinol-dependent nitric oxide reductases (qNORs) are considered members of the respiratory heme-copper oxidase superfamily, are unique to bacteria, and are commonly found in pathogenic bacteria where ...Quinol-dependent nitric oxide reductases (qNORs) are considered members of the respiratory heme-copper oxidase superfamily, are unique to bacteria, and are commonly found in pathogenic bacteria where they play a role in combating the host immune response. qNORs are also essential enzymes in the denitrification pathway, catalysing the reduction of nitric oxide to nitrous oxide. Here, we determine a 2.2 Å cryoEM structure of qNOR from Alcaligenes xylosoxidans, an opportunistic pathogen and a denitrifying bacterium of importance in the nitrogen cycle. This high-resolution structure provides insight into electron, substrate, and proton pathways, and provides evidence that the quinol binding site not only contains the conserved His and Asp residues but also possesses a critical Arg (Arg720) observed in cytochrome bo, a respiratory quinol oxidase. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 14.9 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 22 KB 22 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 14 KB | Display | ![]() |
Images | ![]() | 112.4 KB | ||
Masks | ![]() | 244.1 MB | ![]() | |
Others | ![]() ![]() | 192.5 MB 192.1 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8bgwMC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | main map used for model building | ||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 0.91 Å | ||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Mask #1
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Density Histograms |
-Half map: half map used in refinement
File | emd_16041_half_map_1.map | ||||||||||||
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Annotation | half map used in refinement | ||||||||||||
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Density Histograms |
-Half map: half map used for cross validation
File | emd_16041_half_map_2.map | ||||||||||||
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Annotation | half map used for cross validation | ||||||||||||
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Density Histograms |
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Sample components
-Entire : quinol-dependent Nitric Oxide Reductase
Entire | Name: quinol-dependent Nitric Oxide Reductase |
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Components |
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-Supramolecule #1: quinol-dependent Nitric Oxide Reductase
Supramolecule | Name: quinol-dependent Nitric Oxide Reductase / type: cell / ID: 1 / Parent: 0 / Macromolecule list: #1 / Details: quinol-dependent Nitric Oxide Reductase |
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Source (natural) | Organism: ![]() ![]() |
-Macromolecule #1: Nitric oxide reductase subunit B
Macromolecule | Name: Nitric oxide reductase subunit B / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO / EC number: ![]() |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 84.724867 KDa |
Recombinant expression | Organism: ![]() ![]() ![]() |
Sequence | String: MGPYRRLWFT LIAVLAVTFA LLGFYGGEVY RQAPPIPEEV ASADGTRLFG RDDILDGQTA WQSIGGMQLG SIWGHGAYQA PDWTADWLH RELMAWLDLA ARDAHGRDYG QLDAPAQAAL REQLKAEYRA NRADAAGGKL TLSPRRAQAV AQTEAYYDQL F SDAPALHR ...String: MGPYRRLWFT LIAVLAVTFA LLGFYGGEVY RQAPPIPEEV ASADGTRLFG RDDILDGQTA WQSIGGMQLG SIWGHGAYQA PDWTADWLH RELMAWLDLA ARDAHGRDYG QLDAPAQAAL REQLKAEYRA NRADAAGGKL TLSPRRAQAV AQTEAYYDQL F SDAPALHR SRENYAMKEN TLPDANRRRQ MTHFFFWTAW AAATEREGTS VTYTNNWPHE PLIGNHPSSE NVMWSIISVV VL LAGIGLL IWAWAFLRGK EEDEPPAPAR DPLTTFALTP SQRALGKYLF LVVALFGFQV LLGGFTAHYT VEGQKFYGID LSQ WFPYSL VRTWHIQSAL FWIATGFLAA GLFLAPLING GRDPKYQKAG VDILFWALVL VVVGSFAGNY LAIAQIMPPD LNFW LGHQG YEYVDLGRLW QIGKFAGICF WLVLMLRGIV PALRTPGGDK NLLALLTASV GAIGLFYGAG FFYGERTHLT VMEYW RWWI VHLWVEGFFE VFATTALAFI FSTLGLVSRR MATTASLASA SLFMLGGIPG TFHHLYFAGT TTPVMAVGAS FSALEV VPL IVLGHEAWEN WRLKTRAPWM ENLKWPLMCF VAVAFWNMLG AGVFGFMINP PVSLYYIQGL NTTPVHAHAA LFGVYGF LA LGFTLLVLRY IRPQYALSPG LMKLAFWGLN LGLALMIFTS LLPIGLIQFH ASVSEGMWYA RSEAFMQQDI LKTLRWGR T FGDVVFLLGA LAMVVQVILG LLSGKPAAAE PVLRAEPARR UniProtKB: Nitric oxide reductase subunit B |
-Macromolecule #2: PROTOPORPHYRIN IX CONTAINING FE
Macromolecule | Name: PROTOPORPHYRIN IX CONTAINING FE / type: ligand / ID: 2 / Number of copies: 4 / Formula: HEM |
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Molecular weight | Theoretical: 616.487 Da |
Chemical component information | ![]() ChemComp-HEM: |
-Macromolecule #3: FE (III) ION
Macromolecule | Name: FE (III) ION / type: ligand / ID: 3 / Number of copies: 2 / Formula: FE |
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Molecular weight | Theoretical: 55.845 Da |
-Macromolecule #4: CALCIUM ION
Macromolecule | Name: CALCIUM ION / type: ligand / ID: 4 / Number of copies: 2 / Formula: CA |
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Molecular weight | Theoretical: 40.078 Da |
-Macromolecule #5: decyl 4-O-alpha-D-glucopyranosyl-1-thio-beta-D-glucopyranoside
Macromolecule | Name: decyl 4-O-alpha-D-glucopyranosyl-1-thio-beta-D-glucopyranoside type: ligand / ID: 5 / Number of copies: 2 / Formula: 10M |
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Molecular weight | Theoretical: 498.628 Da |
Chemical component information | ![]() ChemComp-10M: |
-Macromolecule #6: UBIQUINONE-1
Macromolecule | Name: UBIQUINONE-1 / type: ligand / ID: 6 / Number of copies: 2 / Formula: UQ1 |
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Molecular weight | Theoretical: 250.29 Da |
Chemical component information | ![]() ChemComp-UQ1: |
-Macromolecule #7: (1R)-2-{[(R)-(2-AMINOETHOXY)(HYDROXY)PHOSPHORYL]OXY}-1-[(DODECANO...
Macromolecule | Name: (1R)-2-{[(R)-(2-AMINOETHOXY)(HYDROXY)PHOSPHORYL]OXY}-1-[(DODECANOYLOXY)METHYL]ETHYL (9Z)-OCTADEC-9-ENOATE type: ligand / ID: 7 / Number of copies: 13 / Formula: LOP |
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Molecular weight | Theoretical: 661.89 Da |
Chemical component information | ![]() ChemComp-LOP: |
-Macromolecule #8: water
Macromolecule | Name: water / type: ligand / ID: 8 / Number of copies: 449 / Formula: HOH |
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Molecular weight | Theoretical: 18.015 Da |
Chemical component information | ![]() ChemComp-HOH: |
-Experimental details
-Structure determination
Method | ![]() |
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Aggregation state | particle |
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Sample preparation
Concentration | 3 mg/mL |
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Buffer | pH: 7 / Component - Concentration: 50.0 mM / Component - Formula: Tris-HCL![]() ![]() |
Grid | Model: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV Details: Sample at 3 mg/mL was applied to glow-discharged Quantifoil Au R1.2/1.3 holey carbo grids. |
Details | Sample was monodisperse |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | C2 aperture diameter: 50.0 µm / Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD![]() |
Specialist optics | Energy filter - Name: TFS Selectris / Energy filter - Slit width: 10 eV |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Temperature | Min: 80.0 K / Max: 114.0 K |
Image recording | Film or detector model: FEI FALCON IV (4k x 4k) / Digitization - Dimensions - Width: 4096 pixel / Digitization - Dimensions - Height: 4096 pixel / Number grids imaged: 1 / Number real images: 5466 / Average exposure time: 6.11 sec. / Average electron dose: 34.9 e/Å2 |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Refinement | Space: RECIPROCAL / Protocol: RIGID BODY FIT / Overall B value: 47 / Target criteria: Cross-correlation coefficient |
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Output model | ![]() PDB-8bgw: |