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Open data
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Basic information
Entry | Database: PDB / ID: 8qzs | ||||||
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Title | Cryo-EM structure of the cross-exon B-like complex | ||||||
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![]() | SPLICING / spliceosome | ||||||
Function / homology | ![]() microfibril / Lsm2-8 complex / U6 snRNA 3'-end binding / spliceosomal snRNP complex / ribonucleoprotein complex localization / U4atac snRNP / positive regulation of cytotoxic T cell differentiation / maturation of 5S rRNA / RNA localization / U4atac snRNA binding ...microfibril / Lsm2-8 complex / U6 snRNA 3'-end binding / spliceosomal snRNP complex / 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 / U6 snRNP / box C/D sno(s)RNA binding / U11/U12 snRNP / PH domain binding / dense fibrillar component / U2 snRNP binding / U7 snRNA binding / histone pre-mRNA DCP binding / U7 snRNP / 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 / B-WICH complex / box C/D methylation guide snoRNP complex / splicing factor binding / U4/U6 snRNP / spliceosome conformational change to release U4 (or U4atac) and U1 (or U11) / protein methylation / U12-type spliceosomal complex / protein localization to kinetochore / 7-methylguanosine cap hypermethylation / methylosome / P-body assembly / sno(s)RNA-containing ribonucleoprotein complex / U1 snRNP binding / RNA splicing, via transesterification reactions / blastocyst formation / U4 snRNA binding / pICln-Sm protein complex / U2-type catalytic step 1 spliceosome / snRNP binding / small nuclear ribonucleoprotein complex / proline-rich region binding / telomerase RNA binding / telomerase holoenzyme complex / SMN-Sm protein complex / P granule / spliceosomal tri-snRNP complex / U2-type precatalytic spliceosome / positive regulation of mRNA splicing, via spliceosome / mRNA cis splicing, via spliceosome / commitment complex / U2-type spliceosomal complex / U2-type prespliceosome assembly / U2-type catalytic step 2 spliceosome / SAGA complex / U4 snRNP / RNA Polymerase II Transcription Termination / U2 snRNP / U3 snoRNA binding / rRNA modification in the nucleus and cytosol / U1 snRNP / positive regulation of transcription by RNA polymerase III / U2-type prespliceosome / tRNA processing / regulation of alternative mRNA splicing, via spliceosome / K63-linked polyubiquitin modification-dependent protein binding / precatalytic spliceosome / cyclosporin A binding / mitotic spindle assembly checkpoint signaling / positive regulation of transcription by RNA polymerase I / spliceosomal complex assembly / mRNA Splicing - Minor Pathway / mRNA catabolic process / regulation of RNA splicing / mRNA 3'-splice site recognition / MLL1 complex / nuclear-transcribed mRNA catabolic process / spliceosomal tri-snRNP complex assembly / protein deubiquitination / U5 snRNA binding / U5 snRNP / Major pathway of rRNA processing in the nucleolus and cytosol / U2 snRNA binding / U6 snRNA binding / RNA processing / Cajal body / positive regulation of viral genome replication / pre-mRNA intronic binding / regulation of DNA repair / spliceosomal snRNP assembly / ribonucleoprotein complex binding / U1 snRNA binding / U4/U6 x U5 tri-snRNP complex / RNA polymerase II CTD heptapeptide repeat P3 isomerase activity / RNA polymerase II CTD heptapeptide repeat P6 isomerase activity / catalytic step 2 spliceosome Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.1 Å | ||||||
![]() | Zhang, Z. / Kumar, V. / Dybkov, O. / Will, C.L. / Zhong, J. / Ludwig, S. / Urlaub, H. / Kastner, B. / Stark, H. / Luehrmann, R. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structural insights into the cross-exon to cross-intron spliceosome switch. Authors: Zhenwei Zhang / Vinay Kumar / Olexandr Dybkov / Cindy L Will / Jiayun Zhong / Sebastian E J Ludwig / Henning Urlaub / Berthold Kastner / Holger Stark / Reinhard Lührmann / ![]() ![]() Abstract: Early spliceosome assembly can occur through an intron-defined pathway, whereby U1 and U2 small nuclear ribonucleoprotein particles (snRNPs) assemble across the intron. Alternatively, it can occur ...Early spliceosome assembly can occur through an intron-defined pathway, whereby U1 and U2 small nuclear ribonucleoprotein particles (snRNPs) assemble across the intron. Alternatively, it can occur through an exon-defined pathway, whereby U2 binds the branch site located upstream of the defined exon and U1 snRNP interacts with the 5' splice site located directly downstream of it. The U4/U6.U5 tri-snRNP subsequently binds to produce a cross-intron (CI) or cross-exon (CE) pre-B complex, which is then converted to the spliceosomal B complex. Exon definition promotes the splicing of upstream introns and plays a key part in alternative splicing regulation. However, the three-dimensional structure of exon-defined spliceosomal complexes and the molecular mechanism of the conversion from a CE-organized to a CI-organized spliceosome, a pre-requisite for splicing catalysis, remain poorly understood. Here cryo-electron microscopy analyses of human CE pre-B complex and B-like complexes reveal extensive structural similarities with their CI counterparts. The results indicate that the CE and CI spliceosome assembly pathways converge already at the pre-B stage. Add-back experiments using purified CE pre-B complexes, coupled with cryo-electron microscopy, elucidate the order of the extensive remodelling events that accompany the formation of B complexes and B-like complexes. The molecular triggers and roles of B-specific proteins in these rearrangements are also identified. We show that CE pre-B complexes can productively bind in trans to a U1 snRNP-bound 5' splice site. Together, our studies provide new mechanistic insights into the CE to CI switch during spliceosome assembly and its effect on pre-mRNA splice site pairing at this stage. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 2.4 MB | Display | ![]() |
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PDB format | ![]() | Display | ![]() | |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.8 MB | Display | ![]() |
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Full document | ![]() | 1.8 MB | Display | |
Data in XML | ![]() | 285.9 KB | Display | |
Data in CIF | ![]() | 509.6 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 18781MC ![]() 8qozC ![]() 8qp8C ![]() 8qp9C ![]() 8qpaC ![]() 8qpbC ![]() 8qpeC ![]() 8qpkC ![]() 8qxdC ![]() 8r08C ![]() 8r09C ![]() 8r0aC ![]() 8r0bC ![]() 8rm5C M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
-Protein , 16 types, 20 molecules ACDIMUWXrBP4b5b2bxywvKNS
#1: Protein | Mass: 273974.250 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() | ||||||||||
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#7: Protein | Mass: 109560.625 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() | ||||||||||
#8: Protein | Mass: 16807.346 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() | ||||||||||
#10: Protein | Mass: 37563.863 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() | ||||||||||
#11: Protein | Mass: 14191.524 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() | ||||||||||
#12: Protein | Mass: 65481.426 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() | ||||||||||
#13: Protein | Mass: 19230.117 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() | ||||||||||
#14: Protein | Mass: 42575.801 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() | ||||||||||
#17: Protein | Mass: 23664.047 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() | ||||||||||
#24: Protein | Mass: 12427.524 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() | ||||||||||
#39: Protein | Mass: 24642.131 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Source: (natural) ![]() #43: Protein | Mass: 65731.508 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() #44: Protein | Mass: 57616.742 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() #45: Protein | | Mass: 52050.527 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() #51: Protein | | Mass: 107092.242 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() #52: Protein | | Mass: 90414.117 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-U5 small nuclear ribonucleoprotein ... , 2 types, 2 molecules BE
#2: Protein | Mass: 244823.422 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#9: Protein | Mass: 39359.492 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-RNA chain , 7 types, 7 molecules 5264Zz1z2
#3: RNA chain | Mass: 37254.855 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#4: RNA chain | Mass: 60170.445 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#5: RNA chain | Mass: 34098.270 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#6: RNA chain | Mass: 46181.289 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#15: RNA chain | Mass: 4714.817 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#46: RNA chain | Mass: 3555.186 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#47: RNA chain | Mass: 1303.866 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-Splicing factor 3A subunit ... , 3 types, 3 molecules 789
#16: Protein | Mass: 88991.094 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#19: Protein | Mass: 49327.355 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#20: Protein | Mass: 58934.844 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-Splicing factor 3B subunit ... , 6 types, 6 molecules B4B2B5B3B1B6
#18: Protein | Mass: 44436.570 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#21: Protein | Mass: 100377.812 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#22: Protein | Mass: 10149.369 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#23: Protein | Mass: 135718.844 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#25: Protein | Mass: 146024.938 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#26: Protein | Mass: 14606.900 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-U6 snRNA-associated Sm-like protein ... , 7 types, 7 molecules 62636465666768
#27: Protein | Mass: 10847.495 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#28: Protein | Mass: 11859.390 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#29: Protein | Mass: 15375.775 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#30: Protein | Mass: 9945.448 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#31: Protein | Mass: 9139.571 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#32: Protein | Mass: 11617.363 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#33: Protein | Mass: 10410.589 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-Small nuclear ribonucleoprotein ... , 6 types, 18 molecules 4252224f5f2f4e5e2e4g5g2g435323415121
#34: Protein | Mass: 13551.928 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Source: (natural) ![]() #35: Protein | Mass: 9734.171 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Source: (natural) ![]() #36: Protein | Mass: 10817.601 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Source: (natural) ![]() #37: Protein | Mass: 8508.084 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Source: (natural) ![]() #38: Protein | Mass: 13940.308 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Source: (natural) ![]() #40: Protein | Mass: 13310.653 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Source: (natural) ![]() |
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-U2 small nuclear ribonucleoprotein ... , 2 types, 2 molecules 2B2A
#41: Protein | Mass: 25524.367 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#42: Protein | Mass: 28456.584 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-U4/U6 small nuclear ribonucleoprotein ... , 3 types, 3 molecules JLF
#48: Protein | Mass: 77669.188 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#49: Protein | Mass: 55528.969 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#50: Protein | Mass: 58536.105 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: human spliceosomal cross-exon B-like complex / Type: COMPLEX / Entity ID: all / Source: NATURAL |
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Molecular weight | Experimental value: NO |
Source (natural) | Organism: ![]() |
Buffer solution | pH: 7.9 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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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: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 5000 nm / Nominal defocus min: 1500 nm |
Image recording | Electron dose: 45 e/Å2 / Film or detector model: FEI FALCON III (4k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3D reconstruction | Resolution: 4.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 334084 / Symmetry type: POINT |