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- EMDB-14430: Structure of the Escherichia coli formate hydrogenlyase complex (... -
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Open data
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Basic information
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Title | Structure of the Escherichia coli formate hydrogenlyase complex (aerobic preparation, composite structure) | |||||||||
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![]() | FHL / group-4 membrane bound hydrogenase / [NiFe] hydrogenase / MEMBRANE PROTEIN | |||||||||
Function / homology | ![]() formate dehydrogenase (hydrogenase) / formate oxidation / oxidoreductase activity, acting on the aldehyde or oxo group of donors / formate dehydrogenase complex / formate dehydrogenase (NAD+) activity / glucose catabolic process / anaerobic electron transport chain / urate catabolic process / molybdopterin cofactor binding / anaerobic respiration ...formate dehydrogenase (hydrogenase) / formate oxidation / oxidoreductase activity, acting on the aldehyde or oxo group of donors / formate dehydrogenase complex / formate dehydrogenase (NAD+) activity / glucose catabolic process / anaerobic electron transport chain / urate catabolic process / molybdopterin cofactor binding / anaerobic respiration / oxidoreductase activity, acting on NAD(P)H / nickel cation binding / NADH dehydrogenase (ubiquinone) activity / quinone binding / ATP synthesis coupled electron transport / aerobic respiration / respiratory electron transport chain / NAD binding / 4 iron, 4 sulfur cluster binding / oxidoreductase activity / metal ion binding / membrane / plasma membrane / cytosol Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.4 Å | |||||||||
![]() | Steinhilper R / Murphy BJ | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structure of the membrane-bound formate hydrogenlyase complex from Escherichia coli. Authors: Ralf Steinhilper / Gabriele Höff / Johann Heider / Bonnie J Murphy / ![]() Abstract: The prototypical hydrogen-producing enzyme, the membrane-bound formate hydrogenlyase (FHL) complex from Escherichia coli, links formate oxidation at a molybdopterin-containing formate dehydrogenase ...The prototypical hydrogen-producing enzyme, the membrane-bound formate hydrogenlyase (FHL) complex from Escherichia coli, links formate oxidation at a molybdopterin-containing formate dehydrogenase to proton reduction at a [NiFe] hydrogenase. It is of intense interest due to its ability to efficiently produce H during fermentation, its reversibility, allowing H-dependent CO reduction, and its evolutionary link to respiratory complex I. FHL has been studied for over a century, but its atomic structure remains unknown. Here we report cryo-EM structures of FHL in its aerobically and anaerobically isolated forms at resolutions reaching 2.6 Å. This includes well-resolved density for conserved loops linking the soluble and membrane arms believed to be essential in coupling enzymatic turnover to ion translocation across the membrane in the complex I superfamily. We evaluate possible structural determinants of the bias toward hydrogen production over its oxidation and describe an unpredicted metal-binding site near the interface of FdhF and HycF subunits that may play a role in redox-dependent regulation of FdhF interaction with the complex. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 394.9 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 20 KB 20 KB | Display Display | ![]() |
Images | ![]() | 93.6 KB | ||
Filedesc metadata | ![]() | 7.5 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7z0tMC ![]() 7z0sC 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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Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 0.828 Å | ||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
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Sample components
+Entire : Escherichia coli formate hydrogenlyase complex
+Supramolecule #1: Escherichia coli formate hydrogenlyase complex
+Macromolecule #1: Formate hydrogenlyase subunit 3
+Macromolecule #2: Formate hydrogenlyase subunit 5
+Macromolecule #3: Formate hydrogenlyase subunit 2
+Macromolecule #4: Formate hydrogenlyase subunit 7
+Macromolecule #5: Formate hydrogenlyase subunit 6
+Macromolecule #6: Formate hydrogenlyase subunit 4
+Macromolecule #7: Formate dehydrogenase H
+Macromolecule #8: NICKEL (II) ION
+Macromolecule #9: CARBONMONOXIDE-(DICYANO) IRON
+Macromolecule #10: IRON/SULFUR CLUSTER
+Macromolecule #11: FE (III) ION
+Macromolecule #12: 2-AMINO-5,6-DIMERCAPTO-7-METHYL-3,7,8A,9-TETRAHYDRO-8-OXA-1,3,9,1...
+Macromolecule #13: MOLYBDENUM(VI) ION
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.5 |
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Grid | Model: C-flat-2/1 / Material: COPPER / Pretreatment - Type: GLOW DISCHARGE |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Average electron dose: 72.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.2 µm / Nominal defocus min: 1.6 µm |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: INSILICO MODEL |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 3.4 Å / Resolution method: OTHER / Software - Name: RELION (ver. 3) Details: This is a composite map. The maps that constitute this composite map have resolutions between 3.0 and 3.4 A. These have all been determined by FSC 0.143 cut-off. Number images used: 90459 |
Initial angle assignment | Type: MAXIMUM LIKELIHOOD |
Final angle assignment | Type: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3) |