+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-10689 | |||||||||
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Title | human 17S U2 snRNP | |||||||||
Map data | ||||||||||
Sample |
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Keywords | 17S U2 snRNP / SPLICING | |||||||||
Function / homology | Function and homology information U11/U12 snRNP / U2 snRNP binding / U7 snRNA binding / histone pre-mRNA DCP binding / U7 snRNP / B-WICH complex / histone pre-mRNA 3'end processing complex / chromatin-protein adaptor activity / SLBP independent Processing of Histone Pre-mRNAs / SLBP Dependent Processing of Replication-Dependent Histone Pre-mRNAs ...U11/U12 snRNP / U2 snRNP binding / U7 snRNA binding / histone pre-mRNA DCP binding / U7 snRNP / B-WICH complex / histone pre-mRNA 3'end processing complex / chromatin-protein adaptor activity / SLBP independent Processing of Histone Pre-mRNAs / SLBP Dependent Processing of Replication-Dependent Histone Pre-mRNAs / protein methylation / splicing factor binding / U12-type spliceosomal complex / methylosome / 7-methylguanosine cap hypermethylation / poly-ADP-D-ribose modification-dependent protein binding / protein localization to site of double-strand break / U1 snRNP binding / pICln-Sm protein complex / blastocyst formation / snRNP binding / RNA splicing, via transesterification reactions / small nuclear ribonucleoprotein complex / SMN-Sm protein complex / telomerase RNA binding / spliceosomal tri-snRNP complex / telomerase holoenzyme complex / U2-type spliceosomal complex / U2-type precatalytic spliceosome / mRNA cis splicing, via spliceosome / P granule / commitment complex / U2-type prespliceosome assembly / U2-type catalytic step 2 spliceosome / U4 snRNP / positive regulation of mRNA splicing, via spliceosome / U2 snRNP / SAGA complex / RNA Polymerase II Transcription Termination / U1 snRNP / positive regulation of transcription by RNA polymerase III / U2-type prespliceosome / precatalytic spliceosome / positive regulation of transcription by RNA polymerase I / mRNA Splicing - Minor Pathway / spliceosomal complex assembly / regulation of RNA splicing / mRNA 3'-splice site recognition / U5 snRNP / U2 snRNA binding / spliceosomal snRNP assembly / regulation of DNA repair / Cajal body / U1 snRNA binding / U4/U6 x U5 tri-snRNP complex / catalytic step 2 spliceosome / Gene and protein expression by JAK-STAT signaling after Interleukin-12 stimulation / mRNA Splicing - Major Pathway / RNA splicing / stem cell differentiation / spliceosomal complex / double-strand break repair via homologous recombination / B-WICH complex positively regulates rRNA expression / negative regulation of protein catabolic process / mRNA splicing, via spliceosome / fibrillar center / positive regulation of neuron projection development / nuclear matrix / cytoplasmic ribonucleoprotein granule / mRNA processing / site of double-strand break / snRNP Assembly / SARS-CoV-2 modulates host translation machinery / spermatogenesis / RNA helicase activity / nuclear body / RNA helicase / nuclear speck / chromatin remodeling / mRNA binding / protein-containing complex binding / nucleolus / positive regulation of DNA-templated transcription / enzyme binding / positive regulation of transcription by RNA polymerase II / ATP hydrolysis activity / DNA binding / RNA binding / extracellular exosome / zinc ion binding / nucleoplasm / ATP binding / nucleus / cytosol / cytoplasm Similarity search - Function | |||||||||
Biological species | Homo sapiens (human) | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 7.1 Å | |||||||||
Authors | Zhang Z / Will CL | |||||||||
Funding support | Germany, 1 items
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Citation | Journal: Nature / Year: 2020 Title: Molecular architecture of the human 17S U2 snRNP. Authors: Zhenwei Zhang / Cindy L Will / Karl Bertram / Olexandr Dybkov / Klaus Hartmuth / Dmitry E Agafonov / Romina Hofele / Henning Urlaub / Berthold Kastner / Reinhard Lührmann / Holger Stark / Abstract: The U2 small nuclear ribonucleoprotein (snRNP) has an essential role in the selection of the precursor mRNA branch-site adenosine, the nucleophile for the first step of splicing. Stable addition of ...The U2 small nuclear ribonucleoprotein (snRNP) has an essential role in the selection of the precursor mRNA branch-site adenosine, the nucleophile for the first step of splicing. Stable addition of U2 during early spliceosome formation requires the DEAD-box ATPase PRP5. Yeast U2 small nuclear RNA (snRNA) nucleotides that form base pairs with the branch site are initially sequestered in a branchpoint-interacting stem-loop (BSL), but whether the human U2 snRNA folds in a similar manner is unknown. The U2 SF3B1 protein, a common mutational target in haematopoietic cancers, contains a HEAT domain (SF3B1) with an open conformation in isolated SF3b, but a closed conformation in spliceosomes, which is required for stable interaction between U2 and the branch site. Here we report a 3D cryo-electron microscopy structure of the human 17S U2 snRNP at a core resolution of 4.1 Å and combine it with protein crosslinking data to determine the molecular architecture of this snRNP. Our structure reveals that SF3B1 interacts with PRP5 and TAT-SF1, and maintains its open conformation in U2 snRNP, and that U2 snRNA forms a BSL that is sandwiched between PRP5, TAT-SF1 and SF3B1. Thus, substantial remodelling of the BSL and displacement of BSL-interacting proteins must occur to allow formation of the U2-branch-site helix. Our studies provide a structural explanation of why TAT-SF1 must be displaced before the stable addition of U2 to the spliceosome, and identify RNP rearrangements facilitated by PRP5 that are required for stable interaction between U2 and the branch site. | |||||||||
History |
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-Structure visualization
Movie |
Movie viewer |
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Structure viewer | EM map: SurfViewMolmilJmol/JSmol |
Supplemental images |
-Downloads & links
-EMDB archive
Map data | emd_10689.map.gz | 80.1 MB | EMDB map data format | |
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Header (meta data) | emd-10689-v30.xml emd-10689.xml | 33.6 KB 33.6 KB | Display Display | EMDB header |
Images | emd_10689.png | 33.7 KB | ||
Filedesc metadata | emd-10689.cif.gz | 10.5 KB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-10689 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-10689 | HTTPS FTP |
-Validation report
Summary document | emd_10689_validation.pdf.gz | 222.6 KB | Display | EMDB validaton report |
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Full document | emd_10689_full_validation.pdf.gz | 221.7 KB | Display | |
Data in XML | emd_10689_validation.xml.gz | 6.4 KB | Display | |
Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-10689 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-10689 | HTTPS FTP |
-Related structure data
Related structure data | 6y53MC 6y5qMC 6y50C C: citing same article (ref.) M: atomic model generated by this map |
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Similar structure data |
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Related items in Molecule of the Month |
-Map
File | Download / File: emd_10689.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.16 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Sample components
+Entire : human 17S U2 snRNP
+Supramolecule #1: human 17S U2 snRNP
+Macromolecule #1: U2 small nuclear ribonucleoprotein A'
+Macromolecule #2: U2 small nuclear ribonucleoprotein B''
+Macromolecule #3: Splicing factor 3B subunit 6
+Macromolecule #4: Probable ATP-dependent RNA helicase DDX46
+Macromolecule #5: Splicing factor 3A subunit 1
+Macromolecule #6: Splicing factor 3A subunit 2
+Macromolecule #7: Splicing factor 3A subunit 3
+Macromolecule #8: Splicing factor 3B subunit 4
+Macromolecule #9: Small nuclear ribonucleoprotein-associated proteins B and B'
+Macromolecule #10: Small nuclear ribonucleoprotein G
+Macromolecule #11: Small nuclear ribonucleoprotein Sm D1
+Macromolecule #12: Small nuclear ribonucleoprotein Sm D2
+Macromolecule #13: Small nuclear ribonucleoprotein Sm D3
+Macromolecule #14: Small nuclear ribonucleoprotein E
+Macromolecule #15: Small nuclear ribonucleoprotein F
+Macromolecule #16: HIV Tat-specific factor 1
+Macromolecule #17: Splicing factor 3B subunit 2
+Macromolecule #18: Splicing factor 3B subunit 1
+Macromolecule #19: U2 snRNA
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | single particle reconstruction |
Aggregation state | particle |
-Sample preparation
Buffer | pH: 7.9 |
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Grid | Model: Quantifoil R3.5/1 / Material: COPPER / Support film - Material: CARBON / Support film - topology: CONTINUOUS |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK I |
-Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: FEI FALCON III (4k x 4k) / Detector mode: INTEGRATING / Average exposure time: 1.0 sec. / Average electron dose: 72.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
Electron optics | Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD / Cs: 0.01 mm |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
-Image processing
Startup model | Type of model: OTHER |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 7.1 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Number images used: 120070 |
Initial angle assignment | Type: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0) |
Final angle assignment | Type: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0) |