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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-0416 | |||||||||
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Title | T.elongatus NDH Peripheral Arm Focus Map(data-set 1) | |||||||||
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Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.6 Å | |||||||||
![]() | Laughlin TG / Davies KM | |||||||||
![]() | ![]() Title: Structure of the complex I-like molecule NDH of oxygenic photosynthesis. Authors: Thomas G Laughlin / Andrew N Bayne / Jean-François Trempe / David F Savage / Karen M Davies / ![]() ![]() Abstract: Cyclic electron flow around photosystem I (PSI) is a mechanism by which photosynthetic organisms balance the levels of ATP and NADPH necessary for efficient photosynthesis. NAD(P)H dehydrogenase-like ...Cyclic electron flow around photosystem I (PSI) is a mechanism by which photosynthetic organisms balance the levels of ATP and NADPH necessary for efficient photosynthesis. NAD(P)H dehydrogenase-like complex (NDH) is a key component of this pathway in most oxygenic photosynthetic organisms and is the last large photosynthetic membrane-protein complex for which the structure remains unknown. Related to the respiratory NADH dehydrogenase complex (complex I), NDH transfers electrons originating from PSI to the plastoquinone pool while pumping protons across the thylakoid membrane, thereby increasing the amount of ATP produced per NADP molecule reduced. NDH possesses 11 of the 14 core complex I subunits, as well as several oxygenic-photosynthesis-specific (OPS) subunits that are conserved from cyanobacteria to plants. However, the three core complex I subunits that are involved in accepting electrons from NAD(P)H are notably absent in NDH, and it is therefore not clear how NDH acquires and transfers electrons to plastoquinone. It is proposed that the OPS subunits-specifically NdhS-enable NDH to accept electrons from its electron donor, ferredoxin. Here we report a 3.1 Å structure of the 0.42-MDa NDH complex from the thermophilic cyanobacterium Thermosynechococcus elongatus BP-1, obtained by single-particle cryo-electron microscopy. Our maps reveal the structure and arrangement of the principal OPS subunits in the NDH complex, as well as an unexpected cofactor close to the plastoquinone-binding site in the peripheral arm. The location of the OPS subunits supports a role in electron transfer and defines two potential ferredoxin-binding sites at the apex of the peripheral arm. These results suggest that NDH could possess several electron transfer routes, which would serve to maximize plastoquinone reduction and avoid deleterious off-target chemistry of the semi-plastoquinone radical. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 166.8 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 18.8 KB 18.8 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 12.8 KB | Display | ![]() |
Images | ![]() | 56.8 KB | ||
Masks | ![]() | 178 MB | ![]() | |
Others | ![]() ![]() | 141.4 MB 140.8 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 0415C ![]() 0417C ![]() 0418C ![]() 0419C ![]() 0420C ![]() 0425C ![]() 6nbqC ![]() 6nbxC ![]() 6nbyC C: citing same article ( |
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Similar structure data | |
EM raw data | ![]() Data size: 1.8 TB Data #1: Unaligned multiframe micrographs for NDH dataset1 [micrographs - multiframe] Data #2: Unaligned multiframe micrographs for NDH dataset2 [micrographs - multiframe]) |
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Links
EMDB pages | ![]() ![]() |
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Map
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Annotation | unsharpened | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.068 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Mask #1
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Projections & Slices |
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Density Histograms |
-Half map: em-half-volume P1
File | emd_0416_half_map_1.map | ||||||||||||
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Annotation | em-half-volume_P1 | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: em-half-volume P2
File | emd_0416_half_map_2.map | ||||||||||||
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Annotation | em-half-volume_P2 | ||||||||||||
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Density Histograms |
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Sample components
-Entire : NAD(P)H dehydrogenase-like complex peripheral arm(NDH/NDH-1_1/NDH...
Entire | Name: NAD(P)H dehydrogenase-like complex peripheral arm(NDH/NDH-1_1/NDH1L) from T.elongatus |
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Components |
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-Supramolecule #1: NAD(P)H dehydrogenase-like complex peripheral arm(NDH/NDH-1_1/NDH...
Supramolecule | Name: NAD(P)H dehydrogenase-like complex peripheral arm(NDH/NDH-1_1/NDH1L) from T.elongatus type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#17 |
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Source (natural) | Organism: ![]() ![]() |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 0.01 mg/mL | ||||||||
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Buffer | pH: 6 Component:
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Grid | Model: Quantifoil R1.2/1.3 / Support film - Material: CARBON / Support film - topology: CONTINUOUS / Support film - Film thickness: 7.0 nm / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: OTHER | ||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 295 K / Instrument: FEI VITROBOT MARK IV Details: incubate on grid for 30 seconds and blot 2.5 seconds before plunging. |
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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: SUPER-RESOLUTION / Digitization - Frames/image: 1-35 / Number grids imaged: 1 / Number real images: 2519 / Average exposure time: 0.2 sec. / Average electron dose: 50.0 e/Å2 / Details: One image per hole, focusing at each image. |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |