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Open data
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Basic information
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Title | The cryo-EM structure of human pre-C*-I complex | |||||||||
![]() | The cryo-EM map of human pre-C*-I complex | |||||||||
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![]() | spliceosome / C* complex / RNA splicing / PRP22 / exon ligation / FAM192A / SPLICING | |||||||||
Function / homology | ![]() exon-exon junction subcomplex mago-y14 / negative regulation of selenocysteine incorporation / regulation of nuclear-transcribed mRNA catabolic process, nonsense-mediated decay / cellular response to selenite ion / selenocysteine insertion sequence binding / exon-exon junction complex / negative regulation of proteasomal protein catabolic process / regulation of translation at postsynapse, modulating synaptic transmission / regulation of retinoic acid receptor signaling pathway / post-mRNA release spliceosomal complex ...exon-exon junction subcomplex mago-y14 / negative regulation of selenocysteine incorporation / regulation of nuclear-transcribed mRNA catabolic process, nonsense-mediated decay / cellular response to selenite ion / selenocysteine insertion sequence binding / exon-exon junction complex / negative regulation of proteasomal protein catabolic process / regulation of translation at postsynapse, modulating synaptic transmission / regulation of retinoic acid receptor signaling pathway / post-mRNA release spliceosomal complex / U2 snRNP binding / negative regulation of excitatory postsynaptic potential / intracellular mRNA localization / U7 snRNA binding / histone pre-mRNA DCP binding / U7 snRNP / 3'-5' RNA helicase activity / regulation of vitamin D receptor signaling pathway / generation of catalytic spliceosome for first transesterification step / Z-decay: degradation of maternal mRNAs by zygotically expressed factors / histone pre-mRNA 3'end processing complex / alternative mRNA splicing, via spliceosome / positive regulation of androgen receptor activity / SLBP independent Processing of Histone Pre-mRNAs / SLBP Dependent Processing of Replication-Dependent Histone Pre-mRNAs / regulation of mRNA processing / Deadenylation of mRNA / nuclear retinoic acid receptor binding / embryonic brain development / protein methylation / U12-type spliceosomal complex / poly(A) binding / 7-methylguanosine cap hypermethylation / M-decay: degradation of maternal mRNAs by maternally stored factors / mRNA 3'-end processing / sno(s)RNA-containing ribonucleoprotein complex / U1 snRNP binding / RNA splicing, via transesterification reactions / methylosome / ATP-dependent activity, acting on RNA / oocyte development / pICln-Sm protein complex / embryonic cranial skeleton morphogenesis / regulation of mRNA splicing, via spliceosome / C2H2 zinc finger domain binding / U2-type catalytic step 1 spliceosome / positive regulation of mRNA splicing, via spliceosome / pre-mRNA binding / snRNP binding / small nuclear ribonucleoprotein complex / telomerase RNA binding / telomerase holoenzyme complex / SMN-Sm protein complex / P granule / spliceosomal tri-snRNP complex / positive regulation by host of viral transcription / positive regulation of vitamin D receptor signaling pathway / U2-type precatalytic spliceosome / U2-type spliceosomal complex / nuclear vitamin D receptor binding / commitment complex / mRNA cis splicing, via spliceosome / U2-type prespliceosome assembly / Transport of Mature mRNA derived from an Intron-Containing Transcript / 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 / U4 snRNP / RNA Polymerase II Transcription Termination / U2 snRNP / nuclear-transcribed mRNA catabolic process, nonsense-mediated decay / exploration behavior / U1 snRNP / NOTCH3 Intracellular Domain Regulates Transcription / WD40-repeat domain binding / U2-type prespliceosome / protein peptidyl-prolyl isomerization / inner cell mass cell proliferation / positive regulation of neurogenesis / regulation of alternative mRNA splicing, via spliceosome / ubiquitin-ubiquitin ligase activity / nuclear androgen receptor binding / K63-linked polyubiquitin modification-dependent protein binding / precatalytic spliceosome / lipid biosynthetic process / cyclosporin A binding / Notch-HLH transcription pathway / Formation of paraxial mesoderm / positive regulation of transforming growth factor beta receptor signaling pathway / SMAD binding / spliceosomal complex assembly / mitotic G2 DNA damage checkpoint signaling / associative learning / mRNA Splicing - Minor Pathway / spliceosomal tri-snRNP complex assembly / blastocyst development / Prp19 complex / protein K63-linked ubiquitination Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.6 Å | |||||||||
![]() | Zhan X / Lu Y | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Mechanism of exon ligation by human spliceosome. Authors: Xiechao Zhan / Yichen Lu / Xiaofeng Zhang / Chuangye Yan / Yigong Shi / ![]() Abstract: Pre-mRNA splicing involves two sequential reactions: branching and exon ligation. The C complex after branching undergoes remodeling to become the C complex, which executes exon ligation. Here, we ...Pre-mRNA splicing involves two sequential reactions: branching and exon ligation. The C complex after branching undergoes remodeling to become the C complex, which executes exon ligation. Here, we report cryo-EM structures of two intermediate human spliceosomal complexes, pre-C-I and pre-C-II, both at 3.6 Å. In both structures, the 3' splice site is already docked into the active site, the ensuing 3' exon sequences are anchored on PRP8, and the step II factor FAM192A contacts the duplex between U2 snRNA and the branch site. In the transition of pre-C-I to pre-C-II, the step II factors Cactin, FAM32A, PRKRIP1, and SLU7 are recruited. Notably, the RNA helicase PRP22 is positioned quite differently in the pre-C-I, pre-C-II, and C complexes, suggesting a role in 3' exon binding and proofreading. Together with information on human C and C complexes, our studies recapitulate a molecular choreography of the C-to-C transition, revealing mechanistic insights into exon ligation. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 230.2 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 62.3 KB 62.3 KB | Display Display | ![]() |
Images | ![]() | 62.7 KB | ||
Filedesc metadata | ![]() | 19.6 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 537.6 KB | Display | ![]() |
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Full document | ![]() | 537.2 KB | Display | |
Data in XML | ![]() | 7.4 KB | Display | |
Data in CIF | ![]() | 8.5 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7w59MC ![]() 7w5aC ![]() 7w5bC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||
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Annotation | The cryo-EM map of human pre-C*-I complex | ||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.338 Å | ||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
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Sample components
+Entire : Human pre-C*-I complex
+Supramolecule #1: Human pre-C*-I complex
+Macromolecule #1: Pre-mRNA-processing-splicing factor 8
+Macromolecule #2: 116 kDa U5 small nuclear ribonucleoprotein component
+Macromolecule #3: U5 small nuclear ribonucleoprotein 40 kDa protein
+Macromolecule #6: Crooked neck-like protein 1
+Macromolecule #7: Cell division cycle 5-like protein
+Macromolecule #8: Pre-mRNA-splicing factor SYF2
+Macromolecule #9: Protein BUD31 homolog
+Macromolecule #10: Pre-mRNA-splicing factor RBM22
+Macromolecule #11: Spliceosome-associated protein CWC15 homolog
+Macromolecule #12: SNW domain-containing protein 1
+Macromolecule #13: Peptidyl-prolyl cis-trans isomerase-like 1
+Macromolecule #14: Pleiotropic regulator 1
+Macromolecule #15: Serine/arginine repetitive matrix protein 2
+Macromolecule #16: Pre-mRNA-splicing factor CWC22 homolog
+Macromolecule #17: Pre-mRNA-processing factor 17
+Macromolecule #21: Small nuclear ribonucleoprotein-associated proteins B and B'
+Macromolecule #22: PSME3-interacting protein
+Macromolecule #23: Pre-mRNA-splicing factor SYF1
+Macromolecule #24: Peptidyl-prolyl cis-trans isomerase E
+Macromolecule #25: ATP-dependent RNA helicase DHX8
+Macromolecule #26: Small nuclear ribonucleoprotein Sm D3
+Macromolecule #27: Small nuclear ribonucleoprotein Sm D1
+Macromolecule #28: Small nuclear ribonucleoprotein Sm D2
+Macromolecule #29: Small nuclear ribonucleoprotein F
+Macromolecule #30: Small nuclear ribonucleoprotein E
+Macromolecule #31: Small nuclear ribonucleoprotein G
+Macromolecule #32: Protein mago nashi homolog
+Macromolecule #33: RNA-binding protein 8A
+Macromolecule #34: Eukaryotic initiation factor 4A-III
+Macromolecule #35: Protein CASC3
+Macromolecule #36: RNA helicase aquarius
+Macromolecule #37: U2 small nuclear ribonucleoprotein A'
+Macromolecule #38: U2 small nuclear ribonucleoprotein B''
+Macromolecule #39: Pre-mRNA-processing factor 19
+Macromolecule #40: Pre-mRNA-splicing factor SPF27
+Macromolecule #4: pre-mRNA
+Macromolecule #5: pre-mRNA
+Macromolecule #18: U5 snRNA
+Macromolecule #19: U6 snRNA
+Macromolecule #20: U2 snRNA
+Macromolecule #41: INOSITOL HEXAKISPHOSPHATE
+Macromolecule #42: GUANOSINE-5'-TRIPHOSPHATE
+Macromolecule #43: MAGNESIUM ION
+Macromolecule #44: ZINC ION
+Macromolecule #45: ADENOSINE-5'-TRIPHOSPHATE
-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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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: 50.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.2 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: INSILICO MODEL |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 192274 |
Initial angle assignment | Type: MAXIMUM LIKELIHOOD |
Final angle assignment | Type: MAXIMUM LIKELIHOOD |