[English] 日本語
Yorodumi- EMDB-20252: Bile salts alter the mouse norovirus capsid conformation; possibl... -
+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-20252 | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Title | Bile salts alter the mouse norovirus capsid conformation; possible implications for cell attachment and immune evasion. | |||||||||
Map data | MNV Apo | |||||||||
Sample |
| |||||||||
Keywords | murine / norovirus / VIRAL PROTEIN / VIRUS | |||||||||
Function / homology | Calicivirus coat protein C-terminal / Calicivirus coat protein C-terminal / Calicivirus coat protein / Calicivirus coat protein / Picornavirus/Calicivirus coat protein / Viral coat protein subunit / virus-mediated perturbation of host defense response / Capsid protein Function and homology information | |||||||||
Biological species | Murine norovirus 1 | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.1 Å | |||||||||
Authors | Smith TJ | |||||||||
Funding support | United States, 1 items
| |||||||||
Citation | Journal: J Virol / Year: 2019 Title: Bile Salts Alter the Mouse Norovirus Capsid Conformation: Possible Implications for Cell Attachment and Immune Evasion. Authors: Michael B Sherman / Alexis N Williams / Hong Q Smith / Christopher Nelson / Craig B Wilen / Daved H Fremont / Herbert W Virgin / Thomas J Smith / Abstract: Caliciviruses are single-stranded RNA viruses with 180 copies of capsid protein comprising the T=3 icosahedral capsids. The main capsid feature is a pronounced protruding (P) domain dimer formed by ...Caliciviruses are single-stranded RNA viruses with 180 copies of capsid protein comprising the T=3 icosahedral capsids. The main capsid feature is a pronounced protruding (P) domain dimer formed by adjacent subunits on the icosahedral surface while the shell domain forms a tight icosahedral sphere around the genome. While the P domain in the crystal structure of human Norwalk virus (genotype I.1) was tightly associated with the shell surface, the cryo-electron microscopy (cryo-EM) structures of several members of the family (mouse norovirus [MNV], rabbit hemorrhagic disease virus, and human norovirus genotype II.10) revealed a "floating" P domain that hovers above the shell by nearly 10 to 15 Å in physiological buffers. Since this unusual feature is shared among, and unique to, the , it suggests an important biological role. Recently, we demonstrated that bile salts enhance cell attachment to the target cell and increase the intrinsic affinity between the P domain and receptor. Presented here are the cryo-EM structures of MNV-1 in the presence of bile salts (∼3 Å) and the receptor CD300lf (∼8 Å). Surprisingly, bile salts cause the rotation and contraction of the P domain onto the shell surface. This both stabilizes the P domain and appears to allow for a higher degree of saturation of receptor onto the virus. Together, these results suggest that, as the virus moves into the gut and the associated high concentrations of bile, the entire capsid face undergoes a conformational change to optimize receptor avidity while the P domain itself undergoes smaller conformational changes to improve receptor affinity. Mouse norovirus and several other members of the have been shown to have a highly unusual structure with the receptor binding protruding (P) domain only loosely tethered to the main capsid shell. Recent studies demonstrated that bile salts enhance the intrinsic P domain/receptor affinity and is necessary for cell attachment. Presented here are the high-resolution cryo-EM structures of apo MNV, MNV/bile salt, and MNV/bile salt/receptor. Bile salts cause a 90° rotation and collapse of the P domain onto the shell surface that may increase the number of available receptor binding sites. Therefore, bile salts appear to be having several effects on MNV. Bile salts shift the structural equilibrium of the P domain toward a form that binds the receptor and away from one that binds antibody. They may also cause the entire P domain to optimize receptor binding while burying a number of potential epitopes. | |||||||||
History |
|
-Structure visualization
Movie |
Movie viewer |
---|---|
Structure viewer | EM map: SurfViewMolmilJmol/JSmol |
Supplemental images |
-Downloads & links
-EMDB archive
Map data | emd_20252.map.gz | 842.2 MB | EMDB map data format | |
---|---|---|---|---|
Header (meta data) | emd-20252-v30.xml emd-20252.xml | 9.5 KB 9.5 KB | Display Display | EMDB header |
Images | emd_20252.png | 237.8 KB | ||
Filedesc metadata | emd-20252.cif.gz | 5.1 KB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-20252 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-20252 | HTTPS FTP |
-Related structure data
Related structure data | 6p4lMC 6p4jC 6p4kC M: atomic model generated by this map C: citing same article (ref.) |
---|---|
Similar structure data |
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
---|---|
Related items in Molecule of the Month |
-Map
File | Download / File: emd_20252.map.gz / Format: CCP4 / Size: 1 GB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Annotation | MNV Apo | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.07 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
|
-Supplemental data
-Sample components
-Entire : Murine norovirus 1
Entire | Name: Murine norovirus 1 |
---|---|
Components |
|
-Supramolecule #1: Murine norovirus 1
Supramolecule | Name: Murine norovirus 1 / type: virus / ID: 1 / Parent: 0 / Macromolecule list: all / NCBI-ID: 223997 / Sci species name: Murine norovirus 1 / Virus type: VIRION / Virus isolate: STRAIN / Virus enveloped: No / Virus empty: No |
---|
-Macromolecule #1: Capsid protein
Macromolecule | Name: Capsid protein / type: protein_or_peptide / ID: 1 / Number of copies: 3 / Enantiomer: LEVO |
---|---|
Source (natural) | Organism: Murine norovirus 1 |
Molecular weight | Theoretical: 58.700598 KDa |
Recombinant expression | Organism: Murine norovirus 1 |
Sequence | String: MRMSDGAAPK ANGSEASGQD LVPAAVEQAV PIQPVAGAAL AAPAAGQINQ IDPWIFQNFV QCPLGEFSIS PRNTPGEILF DLALGPGLN PYLAHLSAMY TGWVGNMEVQ LVLAGNAFTA GKVVVALVPP YFPKGSLTTA QITCFPHVMC DVRTLEPIQL P LLDVRRVL ...String: MRMSDGAAPK ANGSEASGQD LVPAAVEQAV PIQPVAGAAL AAPAAGQINQ IDPWIFQNFV QCPLGEFSIS PRNTPGEILF DLALGPGLN PYLAHLSAMY TGWVGNMEVQ LVLAGNAFTA GKVVVALVPP YFPKGSLTTA QITCFPHVMC DVRTLEPIQL P LLDVRRVL WHATQDQEES MRLVCMLYTP LRTNSPGDES FVVSGRLLSK PAADFNFVYL TPPIERTIYR MVDLPVIQPR LC THARWPA PVYGLLVDPS LPSNPQWQNG RVHVDGTLLG TTPISGSWVS CFAAEAAYEF QSGTGEVATF TLIEQDGSAY VPG DRAAPL GYPDFSGQLE IEVQTETTKT GDKLKVTTFE MILGPTTNAD QAPYQGRVFA SVTAAASLDL VDGRVRAVPR SIYG FQDTI PEYNDGLLVP LAPPIGPFLP GEVLLRFRTY MRQIDTADAA AEAIDCALPQ EFVSWFASNA FTVQSEALLL RYRNT LTGQ LLFECKLYNE GYIALSYSGS GPLTFPTDGI FEVVSWVPRL YQLASVGSLA TGRMLKQ UniProtKB: Capsid protein |
-Experimental details
-Structure determination
Method | cryo EM |
---|---|
Processing | single particle reconstruction |
Aggregation state | particle |
-Sample preparation
Buffer | pH: 7.2 |
---|---|
Vitrification | Cryogen name: ETHANE |
-Electron microscopy
Microscope | FEI TITAN KRIOS |
---|---|
Image recording | Film or detector model: OTHER / Average electron dose: 28.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
Electron optics | Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD |
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
-Image processing
Startup model | Type of model: PDB ENTRY |
---|---|
Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 30719 |
Initial angle assignment | Type: PROJECTION MATCHING |
Final angle assignment | Type: PROJECTION MATCHING |