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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-3866 | |||||||||
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Title | Sacbrood virus of honeybee - expansion state I | |||||||||
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![]() | empty particle / icosahedral virus particle / iflavirus / expanded particle / VIRUS | |||||||||
Function / homology | ![]() host cell membrane / viral capsid / host cell cytoplasm / RNA helicase activity / viral RNA genome replication / cysteine-type endopeptidase activity / RNA-dependent RNA polymerase activity / DNA-templated transcription / structural molecule activity / proteolysis ...host cell membrane / viral capsid / host cell cytoplasm / RNA helicase activity / viral RNA genome replication / cysteine-type endopeptidase activity / RNA-dependent RNA polymerase activity / DNA-templated transcription / structural molecule activity / proteolysis / RNA binding / ATP binding / membrane / cytoplasm Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 4.06 Å | |||||||||
![]() | Plevka P / Prochazkova M | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Virion structure and genome delivery mechanism of sacbrood honeybee virus. Authors: Michaela Procházková / Tibor Füzik / Karel Škubník / Jana Moravcová / Zorica Ubiparip / Antonín Přidal / Pavel Plevka / ![]() Abstract: Infection by sacbrood virus (SBV) from the family Iflaviridae is lethal to honey bee larvae but only rarely causes the collapse of honey bee colonies. Despite the negative effect of SBV on honey ...Infection by sacbrood virus (SBV) from the family Iflaviridae is lethal to honey bee larvae but only rarely causes the collapse of honey bee colonies. Despite the negative effect of SBV on honey bees, the structure of its particles and mechanism of its genome delivery are unknown. Here we present the crystal structure of SBV virion and show that it contains 60 copies of a minor capsid protein (MiCP) attached to the virion surface. No similar MiCPs have been previously reported in any of the related viruses from the order Picornavirales. The location of the MiCP coding sequence within the SBV genome indicates that the MiCP evolved from a C-terminal extension of a major capsid protein by the introduction of a cleavage site for a virus protease. The exposure of SBV to acidic pH, which the virus likely encounters during cell entry, induces the formation of pores at threefold and fivefold axes of the capsid that are 7 Å and 12 Å in diameter, respectively. This is in contrast to vertebrate picornaviruses, in which the pores along twofold icosahedral symmetry axes are currently considered the most likely sites for genome release. SBV virions lack VP4 subunits that facilitate the genome delivery of many related dicistroviruses and picornaviruses. MiCP subunits induce liposome disruption in vitro, indicating that they are functional analogs of VP4 subunits and enable the virus genome to escape across the endosome membrane into the cell cytoplasm. | |||||||||
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 | ![]() | 38.9 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 18.1 KB 18.1 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 18.7 KB | Display | ![]() |
Images | ![]() | 280.7 KB | ||
Filedesc metadata | ![]() | 6.3 KB | ||
Others | ![]() | 51.4 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6egxMC ![]() 3863C ![]() 3865C ![]() 3867C ![]() 3881C ![]() 5lsfC ![]() 5oypC ![]() 6egvC ![]() 6eh1C ![]() 6eiwC M: atomic model generated by this map C: citing same article ( |
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Similar structure data |
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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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Voxel size | X=Y=Z: 1.063 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Supplemental map: emd 3866 additional.map
File | emd_3866_additional.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
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Sample components
-Entire : Sacbrood virus
Entire | Name: ![]() |
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Components |
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-Supramolecule #1: Sacbrood virus
Supramolecule | Name: Sacbrood virus / type: virus / ID: 1 / Parent: 0 / Macromolecule list: all / Details: Isolated from honeybee pupae / NCBI-ID: 89463 / Sci species name: Sacbrood virus / Virus type: VIRION / Virus isolate: STRAIN / Virus enveloped: No / Virus empty: Yes |
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Host (natural) | Organism: ![]() ![]() |
Virus shell | Shell ID: 1 / Name: capsid / Diameter: 274.96 Å / T number (triangulation number): 3 |
-Macromolecule #1: structural protein VP1
Macromolecule | Name: structural protein VP1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 26.1515 KDa |
Sequence | String: FSDGVTAMGF QSLDTQVSIK DILRRPVLLF NHVELDPDYT GFFIPIMPPS RMMQYKSGDK ETSFQRLIGR TPQAAIMNLF RFWRGSLRY TIIIHSTDGH PIYVTHVPHT GNRVYGLMKV NNLHEYTKVP IFGCGLTTEM IIPSVNPSIC VEVPFDTENN W AVTFDEDA ...String: FSDGVTAMGF QSLDTQVSIK DILRRPVLLF NHVELDPDYT GFFIPIMPPS RMMQYKSGDK ETSFQRLIGR TPQAAIMNLF RFWRGSLRY TIIIHSTDGH PIYVTHVPHT GNRVYGLMKV NNLHEYTKVP IFGCGLTTEM IIPSVNPSIC VEVPFDTENN W AVTFDEDA QRNYSWRDKG DTVTGHLVVT PVVSVYMSVW VEAGDDFEVS NFYGPPSVKT NDWNYAFSDE H UniProtKB: Genome polyprotein |
-Macromolecule #2: structural protein VP2
Macromolecule | Name: structural protein VP2 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 22.563734 KDa |
Sequence | String: GDLVIASSEP TQQFRSLTNR WMPINSIRVT VNGKRNDLLA QYYIPEDFLS THAKCAPNTI PFETYVYGKY ELEMKFVANG NKFQCGKVI ISVKFDSYQA DNINTGFQAA LSRPHIMLDL STNNEGVLKI PFRYHRAFVR NQTHKTATAG VRPGKFASIY V QVLSPLQT ...String: GDLVIASSEP TQQFRSLTNR WMPINSIRVT VNGKRNDLLA QYYIPEDFLS THAKCAPNTI PFETYVYGKY ELEMKFVANG NKFQCGKVI ISVKFDSYQA DNINTGFQAA LSRPHIMLDL STNNEGVLKI PFRYHRAFVR NQTHKTATAG VRPGKFASIY V QVLSPLQT GEGGANDMFI RPFYRYTRAE FAGMSYKVPL T UniProtKB: Genome polyprotein |
-Macromolecule #3: structural protein VP3
Macromolecule | Name: structural protein VP3 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 30.701373 KDa |
Sequence | String: DKPKDVSSIT IIPKPRLGFP HGKGKSDAVA MRVNPVALTS FQDVSAYPDE PRTTLDIARI WGLRSTFNWG SGDEHGKELF NTVLDPGLR FYDQDYEGQI TPMEYVTGLY NFWSGPIELR FDFVSNAFHT GTVIISAEYN RSSTNTDECQ SHSTYTKTFH L GEQKSVHF ...String: DKPKDVSSIT IIPKPRLGFP HGKGKSDAVA MRVNPVALTS FQDVSAYPDE PRTTLDIARI WGLRSTFNWG SGDEHGKELF NTVLDPGLR FYDQDYEGQI TPMEYVTGLY NFWSGPIELR FDFVSNAFHT GTVIISAEYN RSSTNTDECQ SHSTYTKTFH L GEQKSVHF TVPYIYDTVV RRNTASAYLP VTDYDKVDNV SRAQAMGIRA ESKMRVKVRV VNVLRPVAST TSTIEVLVYM RG GKNYALH GLKQSTYWPS NSVVPIDSFP PDGYDP UniProtKB: Genome polyprotein |
-Macromolecule #4: minor capsid protein MiCP
Macromolecule | Name: minor capsid protein MiCP / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 3.107398 KDa |
Sequence | String: DNPHRFLPAN VSNRWNEYSS AYLPRV UniProtKB: Structural protein Vp1 |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 15 mg/mL | |||||||||||||||
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Buffer | pH: 5.8 Component:
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Grid | Model: Quantifoil R2/1 / Material: COPPER / Mesh: 300 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 15 sec. / Pretreatment - Atmosphere: OTHER / Pretreatment - Pressure: 101.325 kPa | |||||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 70 % / Chamber temperature: 298 K / Instrument: FEI VITROBOT MARK II |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Details | Preliminar grid screening was performed manually on FEI Tecnai F20 (cryo stage). |
Image recording | Film or detector model: FEI FALCON II (4k x 4k) / Detector mode: COUNTING / Digitization - Dimensions - Width: 4096 pixel / Digitization - Dimensions - Height: 4096 pixel / Digitization - Frames/image: 2-16 / Number grids imaged: 1 / Average exposure time: 1.0 sec. / Average electron dose: 21.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | C2 aperture diameter: 100.0 µm / Calibrated magnification: 74325 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 4.0 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 75000 |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Refinement | Space: REAL / Protocol: RIGID BODY FIT / Overall B value: 114.26 / Target criteria: R-factor |
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Output model | ![]() PDB-6egx: |