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Yorodumi- PDB-8h6k: Cryo-EM structure of human exon-defined spliceosome in the mature... -
+Open data
-Basic information
Entry | Database: PDB / ID: 8h6k | ||||||
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Title | Cryo-EM structure of human exon-defined spliceosome in the mature B state. | ||||||
Components |
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Keywords | SPLICING / Exon-defined spliceosome / Post pre-B state | ||||||
Function / homology | Function and homology information spliceosomal snRNP complex / microfibril / Lsm2-8 complex / U6 snRNA 3'-end binding / ribonucleoprotein complex localization / U4atac snRNP / positive regulation of cytotoxic T cell differentiation / maturation of 5S rRNA / RNA localization / U4atac snRNA binding ...spliceosomal snRNP complex / microfibril / Lsm2-8 complex / U6 snRNA 3'-end binding / ribonucleoprotein complex localization / U4atac snRNP / positive regulation of cytotoxic T cell differentiation / maturation of 5S rRNA / RNA localization / U4atac snRNA binding / mRNA decay by 5' to 3' exoribonuclease / Lsm1-7-Pat1 complex / U11/U12 snRNP / box C/D sno(s)RNA binding / snRNP binding / U6 snRNP / PH domain binding / U2 snRNP binding / U7 snRNA binding / histone pre-mRNA DCP binding / dense fibrillar component / U7 snRNP / B-WICH complex / histone pre-mRNA 3'end processing complex / cis assembly of pre-catalytic spliceosome / SLBP independent Processing of Histone Pre-mRNAs / SLBP Dependent Processing of Replication-Dependent Histone Pre-mRNAs / spliceosome conformational change to release U4 (or U4atac) and U1 (or U11) / box C/D methylation guide snoRNP complex / splicing factor binding / protein methylation / U4/U6 snRNP / U12-type spliceosomal complex / methylosome / P-body assembly / 7-methylguanosine cap hypermethylation / U2-type catalytic step 1 spliceosome / U1 snRNP binding / pICln-Sm protein complex / RNA splicing, via transesterification reactions / blastocyst formation / spliceosomal tri-snRNP complex / small nuclear ribonucleoprotein complex / P granule / sno(s)RNA-containing ribonucleoprotein complex / U4 snRNA binding / SMN-Sm protein complex / mRNA cis splicing, via spliceosome / U2-type spliceosomal complex / telomerase RNA binding / U2-type precatalytic spliceosome / positive regulation of mRNA splicing, via spliceosome / : / telomerase holoenzyme complex / U2-type prespliceosome assembly / U2-type catalytic step 2 spliceosome / commitment complex / box C/D snoRNP assembly / U4 snRNP / proline-rich region binding / rRNA modification in the nucleus and cytosol / U2 snRNP / SAGA complex / RNA Polymerase II Transcription Termination / nuclear-transcribed mRNA catabolic process / positive regulation of transcription by RNA polymerase III / U1 snRNP / U3 snoRNA binding / U2-type prespliceosome / K63-linked polyubiquitin modification-dependent protein binding / positive regulation of protein targeting to mitochondrion / tRNA processing / precatalytic spliceosome / cyclosporin A binding / regulation of alternative mRNA splicing, via spliceosome / spliceosomal complex assembly / positive regulation of transcription by RNA polymerase I / mRNA Splicing - Minor Pathway / single fertilization / mRNA catabolic process / regulation of RNA splicing / MLL1 complex / mRNA 3'-splice site recognition / spliceosomal tri-snRNP complex assembly / Major pathway of rRNA processing in the nucleolus and cytosol / U5 snRNA binding / U5 snRNP / positive regulation of viral genome replication / Cajal body / U2 snRNA binding / U6 snRNA binding / spliceosomal snRNP assembly / RNA processing / regulation of DNA repair / ribonucleoprotein complex binding / protein peptidyl-prolyl isomerization / pre-mRNA intronic binding / maturation of SSU-rRNA / U1 snRNA binding / U4/U6 x U5 tri-snRNP complex Similarity search - Function | ||||||
Biological species | Homo sapiens (human) | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.7 Å | ||||||
Authors | Zhang, W. / Zhan, X. / Zhang, X. / Bai, R. / Lei, J. / Yan, C. / Shi, Y. | ||||||
Funding support | China, 1items
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Citation | Journal: Cell Res / Year: 2024 Title: Structural insights into human exon-defined spliceosome prior to activation. Authors: Wenyu Zhang / Xiaofeng Zhang / Xiechao Zhan / Rui Bai / Jianlin Lei / Chuangye Yan / Yigong Shi / Abstract: Spliceosome is often assembled across an exon and undergoes rearrangement to span a neighboring intron. Most states of the intron-defined spliceosome have been structurally characterized. However, ...Spliceosome is often assembled across an exon and undergoes rearrangement to span a neighboring intron. Most states of the intron-defined spliceosome have been structurally characterized. However, the structure of a fully assembled exon-defined spliceosome remains at large. During spliceosome assembly, the pre-catalytic state (B complex) is converted from its precursor (pre-B complex). Here we report atomic structures of the exon-defined human spliceosome in four sequential states: mature pre-B, late pre-B, early B, and mature B. In the previously unknown late pre-B state, U1 snRNP is already released but the remaining proteins are still in the pre-B state; unexpectedly, the RNAs are in the B state, with U6 snRNA forming a duplex with 5'-splice site and U5 snRNA recognizing the 3'-end of the exon. In the early and mature B complexes, the B-specific factors are stepwise recruited and specifically recognize the exon 3'-region. Our study reveals key insights into the assembly of the exon-defined spliceosomes and identifies mechanistic steps of the pre-B-to-B transition. | ||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 8h6k.cif.gz | 2.7 MB | Display | PDBx/mmCIF format |
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PDB format | pdb8h6k.ent.gz | Display | PDB format | |
PDBx/mmJSON format | 8h6k.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/h6/8h6k ftp://data.pdbj.org/pub/pdb/validation_reports/h6/8h6k | HTTPS FTP |
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-Related structure data
Related structure data | 34507MC 8h6eC 8h6jC 8h6lC C: citing same article (ref.) M: map data used to model this data |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
-Assembly
Deposited unit |
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1 |
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-Components
+RNA chain , 5 types, 5 molecules A5A6A4A2A
+Protein , 15 types, 17 molecules 5B5C5a4a2a4E4F4G4H4I4J4K4L4M4N4Z2L
+U5 small nuclear ribonucleoprotein ... , 2 types, 2 molecules 5D5E
+Small nuclear ribonucleoprotein ... , 6 types, 18 molecules 5b4b2b5c4c2c5d4d2d5e4e2e5f4f2f5g4g2g
+U6 snRNA-associated Sm-like protein ... , 7 types, 7 molecules 6a6b6c6d6e6f6g
+U4/U6 small nuclear ribonucleoprotein ... , 3 types, 3 molecules 4B4C4D
+U2 small nuclear ribonucleoprotein ... , 2 types, 2 molecules 2B2C
+Splicing factor 3A subunit ... , 3 types, 3 molecules 2D2E2F
+Splicing factor 3B subunit ... , 6 types, 6 molecules 2G2H2I2J2K2M
+Non-polymers , 4 types, 5 molecules
+Details
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
-Sample preparation
Component | Name: exon-defined post pre-B spliceosome / Type: COMPLEX / Entity ID: #2-#15, #17, #20, #22-#36 / Source: NATURAL |
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Molecular weight | Value: 2 MDa / Experimental value: NO |
Source (natural) | Organism: Homo sapiens (human) |
Buffer solution | pH: 8 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
-Electron microscopy imaging
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
Electron lens | Mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2500 nm / Nominal defocus min: 1000 nm |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
-Processing
CTF correction | Type: NONE | ||||||||||||||||||||||||
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3D reconstruction | Resolution: 2.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 414060 / Symmetry type: POINT | ||||||||||||||||||||||||
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