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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-11693 | |||||||||
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Title | Human pre-Bact-2 spliceosome core structure | |||||||||
![]() | Masked/sharpened map of the pre-Bact-2 spliceosome core structure. | |||||||||
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![]() | Complex / spliceosome / catalytic activation / splicing | |||||||||
Function / homology | ![]() microfibril / regulation of retinoic acid receptor signaling pathway / regulation of vitamin D receptor signaling pathway / nuclear retinoic acid receptor binding / embryonic brain development / RNA splicing, via transesterification reactions / mRNA 3'-end processing / U2-type catalytic step 1 spliceosome / positive regulation of mRNA splicing, via spliceosome / pre-mRNA binding ...microfibril / regulation of retinoic acid receptor signaling pathway / regulation of vitamin D receptor signaling pathway / nuclear retinoic acid receptor binding / embryonic brain development / RNA splicing, via transesterification reactions / mRNA 3'-end processing / U2-type catalytic step 1 spliceosome / positive regulation of mRNA splicing, via spliceosome / pre-mRNA binding / positive regulation by host of viral transcription / U2-type precatalytic spliceosome / U2-type spliceosomal complex / positive regulation of vitamin D receptor signaling pathway / mRNA cis splicing, via spliceosome / Transport of Mature mRNA derived from an Intron-Containing Transcript / nuclear vitamin D receptor binding / Notch binding / Regulation of gene expression in late stage (branching morphogenesis) pancreatic bud precursor cells / U2-type catalytic step 2 spliceosome / RUNX3 regulates NOTCH signaling / NOTCH4 Intracellular Domain Regulates Transcription / RNA Polymerase II Transcription Termination / positive regulation of protein targeting to mitochondrion / NOTCH3 Intracellular Domain Regulates Transcription / WD40-repeat domain binding / positive regulation of neurogenesis / precatalytic spliceosome / nuclear androgen receptor binding / K63-linked polyubiquitin modification-dependent protein binding / Notch-HLH transcription pathway / Formation of paraxial mesoderm / positive regulation of transforming growth factor beta receptor signaling pathway / SMAD binding / mRNA Splicing - Minor Pathway / spliceosomal tri-snRNP complex assembly / Prp19 complex / U5 snRNA binding / intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator / protein localization to nucleus / U5 snRNP / positive regulation of G1/S transition of mitotic cell cycle / U2 snRNA binding / U6 snRNA binding / pre-mRNA intronic binding / Cajal body / retinoic acid receptor signaling pathway / U1 snRNA binding / U4/U6 x U5 tri-snRNP complex / cellular response to retinoic acid / catalytic step 2 spliceosome / mRNA Splicing - Major Pathway / RNA splicing / positive regulation of RNA splicing / DNA damage checkpoint signaling / positive regulation of protein export from nucleus / nuclear receptor binding / RNA polymerase II transcription regulatory region sequence-specific DNA binding / spliceosomal complex / Downregulation of SMAD2/3:SMAD4 transcriptional activity / response to cocaine / protein modification process / mRNA splicing, via spliceosome / Pre-NOTCH Transcription and Translation / NOTCH1 Intracellular Domain Regulates Transcription / Constitutive Signaling by NOTCH1 PEST Domain Mutants / Constitutive Signaling by NOTCH1 HD+PEST Domain Mutants / positive regulation of protein import into nucleus / nuclear matrix / protein tag activity / fibrillar center / mRNA processing / calcium-dependent protein binding / transcription corepressor activity / cellular response to xenobiotic stimulus / cellular response to tumor necrosis factor / microtubule cytoskeleton / cellular response to lipopolysaccharide / DNA-binding transcription activator activity, RNA polymerase II-specific / nuclear membrane / transcription coactivator activity / DNA-binding transcription factor activity, RNA polymerase II-specific / nuclear speck / nuclear body / DNA repair / negative regulation of DNA-templated transcription / GTPase activity / intracellular membrane-bounded organelle / mRNA binding / centrosome / regulation of transcription by RNA polymerase II / GTP binding / chromatin / enzyme binding / negative regulation of transcription by RNA polymerase II / positive regulation of transcription by RNA polymerase II / mitochondrion / DNA binding / RNA binding / zinc ion binding Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 4.2 Å | |||||||||
![]() | Townsend C / Kastner B | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Mechanism of protein-guided folding of the active site U2/U6 RNA during spliceosome activation. Authors: Cole Townsend / Majety N Leelaram / Dmitry E Agafonov / Olexandr Dybkov / Cindy L Will / Karl Bertram / Henning Urlaub / Berthold Kastner / Holger Stark / Reinhard Lührmann / ![]() Abstract: Spliceosome activation involves extensive protein and RNA rearrangements that lead to formation of a catalytically active U2/U6 RNA structure. At present, little is known about the assembly pathway ...Spliceosome activation involves extensive protein and RNA rearrangements that lead to formation of a catalytically active U2/U6 RNA structure. At present, little is known about the assembly pathway of the latter and the mechanism whereby proteins aid its proper folding. Here, we report the cryo-electron microscopy structures of two human, activated spliceosome precursors (that is, pre-B complexes) at core resolutions of 3.9 and 4.2 angstroms. These structures elucidate the order of the numerous protein exchanges that occur during activation, the mutually exclusive interactions that ensure the correct order of ribonucleoprotein rearrangements needed to form the U2/U6 catalytic RNA, and the stepwise folding pathway of the latter. Structural comparisons with mature B complexes reveal the molecular mechanism whereby a conformational change in the scaffold protein PRP8 facilitates final three-dimensional folding of the U2/U6 catalytic RNA. | |||||||||
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 | ![]() | 14.3 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 37.5 KB 37.5 KB | Display Display | ![]() |
Images | ![]() | 33.6 KB | ||
Filedesc metadata | ![]() | 12.1 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 366.6 KB | Display | ![]() |
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Full document | ![]() | 366.1 KB | Display | |
Data in XML | ![]() | 7.1 KB | Display | |
Data in CIF | ![]() | 8.2 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7aavMC ![]() 7abfC ![]() 7abgC ![]() 7abhC ![]() 7abiC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | |
EM raw data | ![]() Data #1: Motion-corrected micrographs (without dose-weighting) of human pre-Bact spliceosome [micrographs - single frame] Data #2: Motion-corrected micrographs (with dose-weighting) of human pre-Bact spliceosome [micrographs - single frame]) |
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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 | Masked/sharpened map of the pre-Bact-2 spliceosome core structure. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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
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Sample components
+Entire : pre-Bact-2 spliceosomal core structure
+Supramolecule #1: pre-Bact-2 spliceosomal core structure
+Supramolecule #2: pre-Bact-2 spliceosomal core structure
+Supramolecule #3: MINX M3 pre-mRNA
+Macromolecule #1: 116 kDa U5 small nuclear ribonucleoprotein component
+Macromolecule #2: Protein BUD31 homolog
+Macromolecule #3: Cell division cycle 5-like protein
+Macromolecule #4: Spliceosome-associated protein CWC15 homolog
+Macromolecule #5: Microfibrillar-associated protein 1
+Macromolecule #6: Pleiotropic regulator 1
+Macromolecule #8: Pre-mRNA-processing factor 17
+Macromolecule #9: Pre-mRNA-splicing factor 38A
+Macromolecule #10: Pre-mRNA-processing-splicing factor 8
+Macromolecule #11: Pre-mRNA-splicing factor RBM22
+Macromolecule #12: SNW domain-containing protein 1
+Macromolecule #13: Zinc finger matrin-type protein 2
+Macromolecule #17: Ubiquitin-like protein 5
+Macromolecule #7: MINX M3 pre-mRNA
+Macromolecule #14: U2 snRNA
+Macromolecule #15: U5 snRNA
+Macromolecule #16: U6 snRNA
+Macromolecule #18: GUANOSINE-5'-TRIPHOSPHATE
+Macromolecule #19: MAGNESIUM ION
+Macromolecule #20: D-chiro inositol hexakisphosphate
-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: 7.9 |
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Grid | Model: Quantifoil R3.5/1 / Material: COPPER / Support film - Material: CARBON / Support film - topology: CONTINUOUS |
Vitrification | Cryogen name: ETHANE / Instrument: FEI VITROBOT MARK IV |
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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 / Digitization - Dimensions - Width: 4096 pixel / Digitization - Dimensions - Height: 4096 pixel / Average exposure time: 1.0 sec. / Average electron dose: 2.25 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: OTHER / Details: cryoSPARC ab initio reconstruction |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 4.2 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Number images used: 39336 |
Initial angle assignment | Type: MAXIMUM LIKELIHOOD |
Final angle assignment | Type: MAXIMUM LIKELIHOOD |
-Atomic model buiding 1
Refinement | Space: REAL / Protocol: RIGID BODY FIT |
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Output model | ![]() PDB-7aav: |