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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-3528 | ||||||||||||
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Title | nora virus structure | ||||||||||||
![]() | nora virus b-factor corrected map. | ||||||||||||
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![]() | nora virus / cryo-em / single particle analysis / capsid / virus | ||||||||||||
Function / homology | viral capsid / Capsid protein / ORF4 polyprotein![]() | ||||||||||||
Biological species | ![]() | ||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.7 Å | ||||||||||||
![]() | Laurinmaki P / Shakeel S | ||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Structure of Nora virus at 2.7 Å resolution and implications for receptor binding, capsid stability and taxonomy. Authors: Pasi Laurinmäki / Shabih Shakeel / Jens-Ola Ekström / Pezhman Mohammadi / Dan Hultmark / Sarah J Butcher / ![]() ![]() ![]() Abstract: Nora virus, a virus of Drosophila, encapsidates one of the largest single-stranded RNA virus genomes known. Its taxonomic affinity is uncertain as it has a picornavirus-like cassette of enzymes for ...Nora virus, a virus of Drosophila, encapsidates one of the largest single-stranded RNA virus genomes known. Its taxonomic affinity is uncertain as it has a picornavirus-like cassette of enzymes for virus replication, but the capsid structure was at the time for genome publication unknown. By solving the structure of the virus, and through sequence comparison, we clear up this taxonomic ambiguity in the invertebrate RNA virosphere. Despite the lack of detectable similarity in the amino acid sequences, the 2.7 Å resolution cryoEM map showed Nora virus to have T = 1 symmetry with the characteristic capsid protein β-barrels found in all the viruses in the Picornavirales order. Strikingly, α-helical bundles formed from the extended C-termini of capsid protein VP4B and VP4C protrude from the capsid surface. They are similar to signalling molecule folds and implicated in virus entry. Unlike other viruses of Picornavirales, no intra-pentamer stabilizing annulus was seen, instead the intra-pentamer stability comes from the interaction of VP4C and VP4B N-termini. Finally, intertwining of the N-termini of two-fold symmetry-related VP4A capsid proteins and RNA, provides inter-pentamer stability. Based on its distinct structural elements and the genetic distance to other picorna-like viruses we propose that Nora virus, and a small group of related viruses, should have its own family within the order Picornavirales. | ||||||||||||
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 | ![]() | 380.8 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 22.2 KB 22.2 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 16.7 KB | Display | ![]() |
Images | ![]() | 68.3 KB | ||
Masks | ![]() | 421.9 MB | ![]() | |
Filedesc metadata | ![]() | 6.5 KB | ||
Others | ![]() ![]() ![]() ![]() | 334.6 MB 334.6 MB 336.4 MB 336.5 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 5mm2MC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | |
EM raw data | ![]() Data #1: Unaligned multi-frame micrographs of Nora virus [micrographs - multiframe]) |
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Links
EMDB pages | ![]() ![]() |
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Map
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Annotation | nora virus b-factor corrected map. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.06 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 |
-Additional map: nora virus, not b-factor corrected
File | emd_3528_additional.map | ||||||||||||
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Annotation | nora virus, not b-factor corrected | ||||||||||||
Projections & Slices |
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Density Histograms |
-Additional map: nora virus, not b-factor corrected
File | emd_3528_additional_1.map | ||||||||||||
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Annotation | nora virus, not b-factor corrected | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: #1
File | emd_3528_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #2
File | emd_3528_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
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Sample components
-Entire : Nora virus
Entire | Name: ![]() |
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Components |
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-Supramolecule #1: Nora virus
Supramolecule | Name: Nora virus / type: virus / ID: 1 / Parent: 0 / Macromolecule list: all Details: Drosophila Nora virus strain Umea 2007 was derived from an infectious cDNA clone (accession GQ257737). NCBI-ID: 363716 / Sci species name: Nora virus / Virus type: VIRION / Virus isolate: SPECIES / Virus enveloped: No / Virus empty: No |
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Host (natural) | Organism: ![]() ![]() |
Virus shell | Shell ID: 1 / T number (triangulation number): 1 |
-Macromolecule #1: capsid protein VP4C
Macromolecule | Name: capsid protein VP4C / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 45.258152 KDa |
Sequence | String: SLPENAPNAV SNPQQFITPA TALSAEEYNV HEALGETEEL ELDEFPVLVF KGNVPVDSVT SIPLDLATIY DFAWDGEQNA ISQKFQRFA HLIPKSAGGF GPVIGNYTIT ANLPTGVAGR ILHNCLPGDC VDLAVSRIFG LKSLLGVAGT AVSAIGGPLL N GLVNTAAP ...String: SLPENAPNAV SNPQQFITPA TALSAEEYNV HEALGETEEL ELDEFPVLVF KGNVPVDSVT SIPLDLATIY DFAWDGEQNA ISQKFQRFA HLIPKSAGGF GPVIGNYTIT ANLPTGVAGR ILHNCLPGDC VDLAVSRIFG LKSLLGVAGT AVSAIGGPLL N GLVNTAAP ILSGAAHAIG GNVVGGLADA VIDIGSNLLT PKEKEQPSAN SSAISGDIPI SRFVEMLKYV KENYQDNPVF PT LLVEPQN FISNAMTALK TIPIEVFANM RNVKVERNLF DRTVVPTVKE ATLADIVIPN HMYGYILRDF LQNKRAFQSG TKQ NVYFQQ FLTVLSQRNI RTHITLNDIT SCSIDSESIA NKIERVKHYL STNSSGETTE EFSRTDTGLL PITTRKIVLG ESKR RTERY VAETVFPSVR Q UniProtKB: ORF4 polyprotein |
-Macromolecule #2: capsid protein VP4B
Macromolecule | Name: capsid protein VP4B / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 28.166934 KDa |
Sequence | String: ADNEVTAEGG KLVQELVYDH SAIPVAPVVE TQAEQPEVPV SLVATRKNDT GHLATKWYDF AKISLSNPAN MNWTTLTIDP YNNVTLSRD GESMVLPWRR NVWTTGSKSI GYIRTMVAQI NIPRPPQISG VLEVKDSINN SSISLVEFGG KVEIPIIPKV M NGLATTAS ...String: ADNEVTAEGG KLVQELVYDH SAIPVAPVVE TQAEQPEVPV SLVATRKNDT GHLATKWYDF AKISLSNPAN MNWTTLTIDP YNNVTLSRD GESMVLPWRR NVWTTGSKSI GYIRTMVAQI NIPRPPQISG VLEVKDSINN SSISLVEFGG KVEIPIIPKV M NGLATTAS LPRHRLNPWM RTAESKVELQ YRIIAFNRTS DIADLNVSVL LRPGDSQFQL PMKPDNNVDT RHFELVEALM YH YDSLRIR GEEQ UniProtKB: ORF4 polyprotein |
-Macromolecule #3: Capsid protein VP4A
Macromolecule | Name: Capsid protein VP4A / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 29.019826 KDa |
Sequence | String: MQNPTQTMHI YDMPLRVIAG LSTLAKTTEE DDNTSTGIVV SEVGEPQVVN HPAWIDPFVA YQLRAPRKNI TPDFIFGRAD IGNAFSAFL PRRFSAPAVG TRLVVDPVFT YQQRTVLGLY NYFHADFYYI VHVPAPLGTG IYLKIYAPEF DTTTVTRGIR F KPSASPTI ...String: MQNPTQTMHI YDMPLRVIAG LSTLAKTTEE DDNTSTGIVV SEVGEPQVVN HPAWIDPFVA YQLRAPRKNI TPDFIFGRAD IGNAFSAFL PRRFSAPAVG TRLVVDPVFT YQQRTVLGLY NYFHADFYYI VHVPAPLGTG IYLKIYAPEF DTTTVTRGIR F KPSASPTI ALSVPWSNDL STVETSVGRV GQSGGSIVIE TIEDNSNETV NTPLSITVWC CMANIKATGY RHADTSAYNE KG MNFIPVP VPKPPVPPTK PITGEEQ UniProtKB: Capsid protein |
-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 / Details: 10mM Tris-HCl pH 7.4. |
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Grid | Model: Quantifoil R2/2 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY ARRAY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 75 sec. / Pretreatment - Atmosphere: AIR |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 80 % / Chamber temperature: 295 K / Instrument: LEICA EM GP |
Details | This sample was monodisperse. |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Specialist optics | Energy filter - Name: GIF Quantum |
Image recording | Film or detector model: GATAN K2 QUANTUM (4k x 4k) / Detector mode: INTEGRATING / Number grids imaged: 1 / Number real images: 3516 / Average exposure time: 8.0 sec. / Average electron dose: 40.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Calibrated magnification: 47170 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.5 µm |
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: AB INITIO MODEL / Target criteria: Cross-correlation coefficient |
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Output model | ![]() PDB-5mm2: |