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- EMDB-21954: Cryo-EM Structure of Influenza Hemagglutinin (HA) Trimer Vitrifie... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-21954 | ||||||||||||
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Title | Cryo-EM Structure of Influenza Hemagglutinin (HA) Trimer Vitrified Using Back-it-up | ||||||||||||
![]() | Sharpened map | ||||||||||||
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Function / homology | ![]() viral budding from plasma membrane / clathrin-dependent endocytosis of virus by host cell / host cell surface receptor binding / fusion of virus membrane with host plasma membrane / fusion of virus membrane with host endosome membrane / viral envelope / virion attachment to host cell / host cell plasma membrane / virion membrane / membrane Similarity search - Function | ||||||||||||
Biological species | ![]() ![]() | ||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.9 Å | ||||||||||||
![]() | Tan YZ / Rubinstein JL | ||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Through-grid wicking enables high-speed cryoEM specimen preparation. Authors: Yong Zi Tan / John L Rubinstein / ![]() Abstract: Blotting times for conventional cryoEM specimen preparation complicate time-resolved studies and lead to some specimens adopting preferred orientations or denaturing at the air-water interface. Here, ...Blotting times for conventional cryoEM specimen preparation complicate time-resolved studies and lead to some specimens adopting preferred orientations or denaturing at the air-water interface. Here, it is shown that solution sprayed onto one side of a holey cryoEM grid can be wicked through the grid by a glass-fiber filter held against the opposite side, often called the `back', of the grid, producing a film suitable for vitrification. This process can be completed in tens of milliseconds. Ultrasonic specimen application and through-grid wicking were combined in a high-speed specimen-preparation device that was named `Back-it-up' or BIU. The high liquid-absorption capacity of the glass fiber compared with self-wicking grids makes the method relatively insensitive to the amount of sample applied. Consequently, through-grid wicking produces large areas of ice that are suitable for cryoEM for both soluble and detergent-solubilized protein complexes. The speed of the device increases the number of views for a specimen that suffers from preferred orientations. | ||||||||||||
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 | ![]() | 59.8 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 28.9 KB 28.9 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 9.7 KB | Display | ![]() |
Images | ![]() | 153.9 KB | ||
Masks | ![]() | 64 MB | ![]() | |
Others | ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 12.6 MB 10.8 MB 119.8 KB 2 MB 32.2 MB 59.4 MB 59.4 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6wxbMC ![]() 6wx6C M: atomic model generated by this map C: citing same article ( |
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Similar structure data | |
EM raw data | ![]() Data size: 1.2 TB Data #1: Unaligned Falcon IV movies [micrographs - multiframe] Data #2: Aligned micrographs [micrographs - single frame] Data #3: Final Refined Particles with Euler Angles and Shifts [picked particles - single frame - processed]) |
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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 | Sharpened map | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.03 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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Density Histograms |
-Additional map: 3DFSC - Raw
File | emd_21954_additional_1.map | ||||||||||||
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Annotation | 3DFSC - Raw | ||||||||||||
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-Additional map: 3DFSC - Thresholded
File | emd_21954_additional_2.map | ||||||||||||
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Annotation | 3DFSC - Thresholded | ||||||||||||
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Density Histograms |
-Additional map: 3DFSC - Thresholded and Binarized
File | emd_21954_additional_3.map | ||||||||||||
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Annotation | 3DFSC - Thresholded and Binarized | ||||||||||||
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-Additional map: Local resolution map
File | emd_21954_additional_4.map | ||||||||||||
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Annotation | Local resolution map | ||||||||||||
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-Additional map: Raw map
File | emd_21954_additional_5.map | ||||||||||||
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Annotation | Raw map | ||||||||||||
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Density Histograms |
-Half map: Half map 1
File | emd_21954_half_map_1.map | ||||||||||||
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Annotation | Half map 1 | ||||||||||||
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Density Histograms |
-Half map: Half map 2
File | emd_21954_half_map_2.map | ||||||||||||
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Annotation | Half map 2 | ||||||||||||
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Density Histograms |
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Sample components
-Entire : Influenza Hemagglutinin Trimer (H3N2) (A/Hong Kong/1/1968)
Entire | Name: Influenza Hemagglutinin Trimer (H3N2) (A/Hong Kong/1/1968) |
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Components |
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-Supramolecule #1: Influenza Hemagglutinin Trimer (H3N2) (A/Hong Kong/1/1968)
Supramolecule | Name: Influenza Hemagglutinin Trimer (H3N2) (A/Hong Kong/1/1968) type: organelle_or_cellular_component / ID: 1 / Parent: 0 / Macromolecule list: #1 |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 190 KDa |
Recombinant expression | Organism: ![]() |
-Macromolecule #1: Hemagglutinin
Macromolecule | Name: Hemagglutinin / type: protein_or_peptide / ID: 1 / Number of copies: 3 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() Strain: A/Hong Kong/1/1968 H3N2 |
Molecular weight | Theoretical: 62.855215 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: QDLPGNDNST ATLCLGHHAV PNGTLVKTIT DDQIEVTNAT ELVQSSSTGK ICNNPHRILD GIDCTLIDAL LGDPHCDVFQ NETWDLFVE RSKAFSNCYP YDVPDYASLR SLVASSGTLE FITEGFTWTG VTQNGGSNAC KRGPGSGFFS RLNWLTKSGS T YPVLNVTM ...String: QDLPGNDNST ATLCLGHHAV PNGTLVKTIT DDQIEVTNAT ELVQSSSTGK ICNNPHRILD GIDCTLIDAL LGDPHCDVFQ NETWDLFVE RSKAFSNCYP YDVPDYASLR SLVASSGTLE FITEGFTWTG VTQNGGSNAC KRGPGSGFFS RLNWLTKSGS T YPVLNVTM PNNDNFDKLY IWGVHHPSTN QEQTSLYVQA SGRVTVSTRR SQQTIIPNIG SRPWVRGLSS RISIYWTIVK PG DVLVINS NGNLIAPRGY FKMRTGKSSI MRSDAPIDTC ISECITPNGS IPNDKPFQNV NKITYGACPK YVKQNTLKLA TGM RNVPEK QTRGLFGAIA GFIENGWEGM IDGWYGFRHQ NSEGTGQAAD LKSTQAAIDQ INGKLNRVIE KTNEKFHQIE KEFS EVEGR IQDLEKYVED TKIDLWSYNA ELLVALENQH TIDLTDSEMN KLFEKTRRQL RENAEDMGNG CFKIYHKCDN ACIES IRNG TYDHDVYRDE ALNNRFQIKG VELKSGYDGG GGTGGGGTGR MKQIEDKIEE ILSKIYHIEN EIARIKKLIG ERHHHH HH |
-Macromolecule #2: 2-acetamido-2-deoxy-beta-D-glucopyranose
Macromolecule | Name: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 2 / Number of copies: 12 / Formula: NAG |
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Molecular weight | Theoretical: 221.208 Da |
Chemical component information | ![]() ChemComp-NAG: |
-Macromolecule #3: beta-D-mannopyranose
Macromolecule | Name: beta-D-mannopyranose / type: ligand / ID: 3 / Number of copies: 3 / Formula: BMA |
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Molecular weight | Theoretical: 180.156 Da |
Chemical component information | ![]() ChemComp-BMA: |
-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: 7.4 |
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Grid | Model: Homemade / Material: COPPER/RHODIUM / Support film - Material: GOLD / Support film - topology: HOLEY ARRAY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR Details: Grid was glow discharged on both sides for 120s each. |
Vitrification | Cryogen name: ETHANE-PROPANE / Chamber humidity: 50 % / Chamber temperature: 298 K / Instrument: HOMEMADE PLUNGER Details: Back-it-up (ultrasonic specimen application and through-grid wicking in a high-speed specimen preparation device) was used. |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: FEI FALCON IV (4k x 4k) / Digitization - Dimensions - Width: 4096 pixel / Digitization - Dimensions - Height: 4096 pixel / Digitization - Sampling interval: 14.0 µm / Number grids imaged: 1 / Number real images: 1556 / Average exposure time: 9.0 sec. / Average electron dose: 45.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |