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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-0361 | |||||||||||||||
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Title | Saccharomyces cerevisiae spliceosomal E complex (ACT1) | |||||||||||||||
![]() | Spliceosomal E complex (ACT1) | |||||||||||||||
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![]() | pre-mRNA splicing / spliceosome / E complex / RNA BINDING PROTEIN | |||||||||||||||
Function / homology | ![]() mRNA splice site recognition / splicing factor binding / U4/U6 snRNP / 7-methylguanosine cap hypermethylation / snRNP binding / pICln-Sm protein complex / small nuclear ribonucleoprotein complex / SMN-Sm protein complex / spliceosomal tri-snRNP complex / poly(U) RNA binding ...mRNA splice site recognition / splicing factor binding / U4/U6 snRNP / 7-methylguanosine cap hypermethylation / snRNP binding / pICln-Sm protein complex / small nuclear ribonucleoprotein complex / SMN-Sm protein complex / spliceosomal tri-snRNP complex / poly(U) RNA binding / commitment complex / U2-type prespliceosome assembly / positive regulation of mRNA splicing, via spliceosome / U4 snRNP / U2 snRNP / U1 snRNP / pre-mRNA 5'-splice site binding / U2-type prespliceosome / precatalytic spliceosome / spliceosomal complex assembly / mRNA 5'-splice site recognition / U5 snRNP / spliceosomal snRNP assembly / U1 snRNA binding / U4/U6 x U5 tri-snRNP complex / catalytic step 2 spliceosome / spliceosomal complex / mRNA splicing, via spliceosome / mRNA binding / RNA binding / zinc ion binding / nucleus / cytoplasm / cytosol Similarity search - Function | |||||||||||||||
Biological species | ![]() ![]() ![]() ![]() ![]() ![]() | |||||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.2 Å | |||||||||||||||
![]() | Liu S / Li X | |||||||||||||||
Funding support | ![]()
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![]() | ![]() Title: A unified mechanism for intron and exon definition and back-splicing. Authors: Xueni Li / Shiheng Liu / Lingdi Zhang / Aaron Issaian / Ryan C Hill / Sara Espinosa / Shasha Shi / Yanxiang Cui / Kalli Kappel / Rhiju Das / Kirk C Hansen / Z Hong Zhou / Rui Zhao / ![]() Abstract: The molecular mechanisms of exon definition and back-splicing are fundamental unanswered questions in pre-mRNA splicing. Here we report cryo-electron microscopy structures of the yeast spliceosomal E ...The molecular mechanisms of exon definition and back-splicing are fundamental unanswered questions in pre-mRNA splicing. Here we report cryo-electron microscopy structures of the yeast spliceosomal E complex assembled on introns, providing a view of the earliest event in the splicing cycle that commits pre-mRNAs to splicing. The E complex architecture suggests that the same spliceosome can assemble across an exon, and that it either remodels to span an intron for canonical linear splicing (typically on short exons) or catalyses back-splicing to generate circular RNA (on long exons). The model is supported by our experiments, which show that an E complex assembled on the middle exon of yeast EFM5 or HMRA1 can be chased into circular RNA when the exon is sufficiently long. This simple model unifies intron definition, exon definition, and back-splicing through the same spliceosome in all eukaryotes and should inspire experiments in many other systems to understand the mechanism and regulation of these processes. | |||||||||||||||
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 | ![]() | 155.5 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 32.9 KB 32.9 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 12.3 KB | Display | ![]() |
Images | ![]() | 41 KB | ||
Filedesc metadata | ![]() | 9.6 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 588.3 KB | Display | ![]() |
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Full document | ![]() | 587.8 KB | Display | |
Data in XML | ![]() | 12.7 KB | Display | |
Data in CIF | ![]() | 17.3 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6n7rMC ![]() 0360C ![]() 6n7pC C: citing same article ( M: atomic model generated by this map |
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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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Annotation | Spliceosomal E complex (ACT1) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.36 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 : Saccharomyces cerevisiae spliceosomal E complex (ACT1)
+Supramolecule #1: Saccharomyces cerevisiae spliceosomal E complex (ACT1)
+Macromolecule #1: U1 small nuclear ribonucleoprotein 70 kDa homolog
+Macromolecule #2: U1 small nuclear ribonucleoprotein C
+Macromolecule #3: U1 small nuclear ribonucleoprotein A
+Macromolecule #4: U1 small nuclear ribonucleoprotein component PRP42
+Macromolecule #5: Pre-mRNA-processing factor 39
+Macromolecule #6: Protein NAM8
+Macromolecule #7: 56 kDa U1 small nuclear ribonucleoprotein component
+Macromolecule #8: U1 small nuclear ribonucleoprotein component SNU71,U1 small nucle...
+Macromolecule #9: Protein LUC7
+Macromolecule #10: Small nuclear ribonucleoprotein-associated protein B
+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: Small nuclear ribonucleoprotein G
+Macromolecule #17: U1 snRNA
+Macromolecule #18: ACT1 pre-mRNA
+Macromolecule #19: ZINC ION
-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 | Details: unspecified |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average electron dose: 30.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |