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Yorodumi- EMDB-25633: Structure of electron bifurcating Ni-Fe hydrogenase complex HydAB... -
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-Basic information
Entry | Database: EMDB / ID: EMD-25633 | |||||||||
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Title | Structure of electron bifurcating Ni-Fe hydrogenase complex HydABCSL in FMN-free apo state | |||||||||
Map data | Electron bifurcating Ni-Fe hydrogenase complex HydABCSL in FMN-free apo state | |||||||||
Sample |
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Keywords | hydrogenase complex / electron bifurcation / OXIDOREDUCTASE | |||||||||
Function / homology | Function and homology information ferredoxin hydrogenase activity / iron-sulfur cluster binding / nickel cation binding / NADH dehydrogenase (ubiquinone) activity / ATP synthesis coupled electron transport / 2 iron, 2 sulfur cluster binding / FMN binding / 4 iron, 4 sulfur cluster binding / oxidoreductase activity / membrane / metal ion binding Similarity search - Function | |||||||||
Biological species | Acetomicrobium mobile (bacteria) | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.2 Å | |||||||||
Authors | Feng X / Li H | |||||||||
Funding support | United States, 2 items
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Citation | Journal: Sci Adv / Year: 2022 Title: Structure and electron transfer pathways of an electron-bifurcating NiFe-hydrogenase. Authors: Xiang Feng / Gerrit J Schut / Dominik K Haja / Michael W W Adams / Huilin Li / Abstract: Electron bifurcation enables thermodynamically unfavorable biochemical reactions. Four groups of bifurcating flavoenzyme are known and three use FAD to bifurcate. FeFe-HydABC hydrogenase represents ...Electron bifurcation enables thermodynamically unfavorable biochemical reactions. Four groups of bifurcating flavoenzyme are known and three use FAD to bifurcate. FeFe-HydABC hydrogenase represents the fourth group, but its bifurcation site is unknown. We report cryo-EM structures of the related NiFe-HydABCSL hydrogenase that reversibly oxidizes H and couples endergonic reduction of ferredoxin with exergonic reduction of NAD. FMN surrounded by a unique arrangement of iron sulfur clusters forms the bifurcating center. NAD binds to FMN in HydB, and electrons from H via HydA to a HydB [4Fe-4S] cluster enable the FMN to reduce NAD. Low-potential electron transfer from FMN to the HydC [2Fe-2S] cluster and subsequent reduction of a uniquely penta-coordinated HydB [2Fe-2S] cluster require conformational changes, leading to ferredoxin binding and reduction by a [4Fe-4S] cluster in HydB. This work clarifies the electron transfer pathways for a large group of hydrogenases underlying many essential functions in anaerobic microorganisms. | |||||||||
History |
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-Structure visualization
Movie |
Movie viewer |
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Structure viewer | EM map: SurfViewMolmilJmol/JSmol |
Supplemental images |
-Downloads & links
-EMDB archive
Map data | emd_25633.map.gz | 59.7 MB | EMDB map data format | |
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Header (meta data) | emd-25633-v30.xml emd-25633.xml | 17.6 KB 17.6 KB | Display Display | EMDB header |
FSC (resolution estimation) | emd_25633_fsc.xml | 9.3 KB | Display | FSC data file |
Images | emd_25633.png | 83.5 KB | ||
Filedesc metadata | emd-25633.cif.gz | 6.7 KB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-25633 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-25633 | HTTPS FTP |
-Validation report
Summary document | emd_25633_validation.pdf.gz | 422.2 KB | Display | EMDB validaton report |
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Full document | emd_25633_full_validation.pdf.gz | 421.8 KB | Display | |
Data in XML | emd_25633_validation.xml.gz | 10.8 KB | Display | |
Data in CIF | emd_25633_validation.cif.gz | 14.4 KB | Display | |
Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-25633 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-25633 | HTTPS FTP |
-Related structure data
Related structure data | 7t2rMC 7t30C M: atomic model generated by this map C: citing same article (ref.) |
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Similar structure data |
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Related items in Molecule of the Month |
-Map
File | Download / File: emd_25633.map.gz / Format: CCP4 / Size: 67 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | Electron bifurcating Ni-Fe hydrogenase complex HydABCSL in FMN-free apo state | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.029 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Sample components
+Entire : NiFe hydrogenase complex ABCSL
+Supramolecule #1: NiFe hydrogenase complex ABCSL
+Macromolecule #1: NiFe hydrogenase subunit A
+Macromolecule #2: NiFe hydrogenase subunit B
+Macromolecule #3: NiFe hydrogenase subunit C
+Macromolecule #4: NiFe hydrogenase large subunit
+Macromolecule #5: NiFe hydrogenase small subunit
+Macromolecule #6: FE2/S2 (INORGANIC) CLUSTER
+Macromolecule #7: IRON/SULFUR CLUSTER
+Macromolecule #8: NICKEL (III) ION
+Macromolecule #9: CARBONMONOXIDE-(DICYANO) IRON
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | single particle reconstruction |
Aggregation state | particle |
-Sample preparation
Buffer | pH: 7.5 Component:
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Grid | Model: Quantifoil R2/1 / Material: COPPER / Mesh: 300 | |||||||||
Vitrification | Cryogen name: ETHANE / Instrument: FEI VITROBOT MARK IV |
-Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average electron dose: 76.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: -2.0 µm / Nominal defocus min: -1.0 µm |
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
+Image processing
-Atomic model buiding 1
Refinement | Protocol: FLEXIBLE FIT |
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Output model | PDB-7t2r: |