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- PDB-5lj3: Structure of the core of the yeast spliceosome immediately after ... -
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Basic information
Entry | Database: PDB / ID: 5lj3 | ||||||
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Title | Structure of the core of the yeast spliceosome immediately after branching | ||||||
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![]() | SPLICING / spliceosome / snRNP / pre-mRNA splicing / trans-esterification / lariat intermediate / complex C | ||||||
Function / homology | ![]() post-spliceosomal complex / U2-type post-mRNA release spliceosomal complex / cellular bud site selection / post-mRNA release spliceosomal complex / generation of catalytic spliceosome for first transesterification step / cis assembly of pre-catalytic spliceosome / splicing factor binding / spliceosome conformational change to release U4 (or U4atac) and U1 (or U11) / U4/U6 snRNP / Prp19 complex ...post-spliceosomal complex / U2-type post-mRNA release spliceosomal complex / cellular bud site selection / post-mRNA release spliceosomal complex / generation of catalytic spliceosome for first transesterification step / cis assembly of pre-catalytic spliceosome / splicing factor binding / spliceosome conformational change to release U4 (or U4atac) and U1 (or U11) / U4/U6 snRNP / Prp19 complex / 7-methylguanosine cap hypermethylation / pICln-Sm protein complex / pre-mRNA binding / U2-type catalytic step 1 spliceosome / small nuclear ribonucleoprotein complex / SMN-Sm protein complex / spliceosomal tri-snRNP complex / poly(U) RNA binding / U2-type spliceosomal complex / mRNA cis splicing, via spliceosome / commitment complex / U2-type prespliceosome assembly / U2-type catalytic step 2 spliceosome / U4 snRNP / U2 snRNP / U1 snRNP / U2-type prespliceosome / precatalytic spliceosome / Formation of TC-NER Pre-Incision Complex / generation of catalytic spliceosome for second transesterification step / spliceosomal complex assembly / Gap-filling DNA repair synthesis and ligation in TC-NER / DNA replication origin binding / mRNA 5'-splice site recognition / regulation of RNA splicing / mRNA 3'-splice site recognition / Dual incision in TC-NER / spliceosomal tri-snRNP complex assembly / DNA replication initiation / U5 snRNA binding / U5 snRNP / U2 snRNA binding / U6 snRNA binding / spliceosomal snRNP assembly / positive regulation of cell cycle / pre-mRNA intronic binding / U1 snRNA binding / U4/U6 x U5 tri-snRNP complex / catalytic step 2 spliceosome / RNA splicing / positive regulation of RNA splicing / RNA polymerase II transcription regulatory region sequence-specific DNA binding / spliceosomal complex / mRNA splicing, via spliceosome / metallopeptidase activity / DNA-binding transcription factor activity, RNA polymerase II-specific / cell cycle / GTPase activity / mRNA binding / chromatin binding / chromatin / GTP binding / RNA binding / nucleus / metal ion binding / cytoplasm / cytosol Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.8 Å | ||||||
![]() | Galej, W.P. / Wilkinson, M.F. / Fica, S.M. / Oubridge, C. / Newman, A.J. / Nagai, K. | ||||||
![]() | ![]() Title: Cryo-EM structure of the spliceosome immediately after branching. Authors: Wojciech P Galej / Max E Wilkinson / Sebastian M Fica / Chris Oubridge / Andrew J Newman / Kiyoshi Nagai / ![]() Abstract: Precursor mRNA (pre-mRNA) splicing proceeds by two consecutive transesterification reactions via a lariat-intron intermediate. Here we present the 3.8 Å cryo-electron microscopy structure of the ...Precursor mRNA (pre-mRNA) splicing proceeds by two consecutive transesterification reactions via a lariat-intron intermediate. Here we present the 3.8 Å cryo-electron microscopy structure of the spliceosome immediately after lariat formation. The 5'-splice site is cleaved but remains close to the catalytic Mg site in the U2/U6 small nuclear RNA (snRNA) triplex, and the 5'-phosphate of the intron nucleotide G(+1) is linked to the branch adenosine 2'OH. The 5'-exon is held between the Prp8 amino-terminal and linker domains, and base-pairs with U5 snRNA loop 1. Non-Watson-Crick interactions between the branch helix and 5'-splice site dock the branch adenosine into the active site, while intron nucleotides +3 to +6 base-pair with the U6 snRNA ACAGAGA sequence. Isy1 and the step-one factors Yju2 and Cwc25 stabilize docking of the branch helix. The intron downstream of the branch site emerges between the Prp8 reverse transcriptase and linker domains and extends towards the Prp16 helicase, suggesting a plausible mechanism of remodelling before exon ligation. | ||||||
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 1.7 MB | Display | ![]() |
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PDB format | ![]() | 1.3 MB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 1.4 MB | Display | ![]() |
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Full document | ![]() | 1.4 MB | Display | |
Data in XML | ![]() | 178.9 KB | Display | |
Data in CIF | ![]() | 298.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 4055MC ![]() 4056C ![]() 4057C ![]() 4058C ![]() 4059C ![]() 5lj5C M: map data used to model this data C: citing same article ( |
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Similar structure data | |
EM raw data | ![]() Data #1: Unaligned movies of C-complex spliceosome with 3' splice site AG to AC mutation (Dataset 1) [micrographs - multiframe] Data #2: Unaligned movies of C and C*-complex spliceosomes with 3' splice site AG to AdG mutation (Dataset 2) [micrographs - multiframe] Data #3: Unaligned movies of C and C*-complex spliceosomes with 3' splice site AG to AdG mutation (Dataset 3) [micrographs - multiframe] Data #4: Aligned movies of C-complex spliceosomes with cold-sensitive prp16-302 mutation, purified with Cwc25 (Dataset 4) [micrographs - multiframe] Data #5: Unaligned movies of C-complex spliceosomes with cold-sensitive prp16-302 mutation, purified with Cwc25 and incubated with ATP and Mg (Dataset 5) [micrographs - multiframe] Data #6: Unaligned movies of C, C*, and P-complex spliceosomes with dominant-negative Prp22 mutation K512A, purified with Slu7 (Dataset 6) [micrographs - multiframe] Data #7: Unaligned movies of P-complex spliceosomes with dominant-negative Prp22 mutation K512A, treated with anti-3'exon RNaseH oligo, purified in presence of Mg (Dataset 9) [micrographs - single frame] Data #8: Selected C-complex particles after polishing [picked particles - single frame - processed] Data #9: Selected P-complex particles after polishing [picked particles - single frame - processed] Data #10: Various signal subtractions for C- and P-complex spliceosomes [picked particles - single frame - processed]) |
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Links
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Assembly
Deposited unit | ![]()
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Components
-RNA chain , 5 types, 5 molecules UEIZV
#1: RNA chain | Mass: 57444.875 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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#2: RNA chain | Mass: 5170.152 Da / Num. of mol.: 1 / Source method: isolated from a natural source Details: This RNA was produced from an in vitro transcribed yeast UBC4 pre-mRNA with two stem-loops added at the 5' end for binding by the MS2 bacteriophage coat protein. This pre-mRNA is added to a ...Details: This RNA was produced from an in vitro transcribed yeast UBC4 pre-mRNA with two stem-loops added at the 5' end for binding by the MS2 bacteriophage coat protein. This pre-mRNA is added to a yeast splicing extract and the first step of splicing yields the 5' exon and the lariat intron-3' exon intermediate, which both remain associated with the spliceosome. Source: (natural) ![]() ![]() |
#3: RNA chain | Mass: 24109.115 Da / Num. of mol.: 1 / Source method: isolated from a natural source Details: This RNA was produced from an in vitro transcribed yeast UBC4 pre-mRNA with two stem-loops added at the 5' end for binding by the MS2 bacteriophage coat protein. This pre-mRNA is added to a ...Details: This RNA was produced from an in vitro transcribed yeast UBC4 pre-mRNA with two stem-loops added at the 5' end for binding by the MS2 bacteriophage coat protein. This pre-mRNA is added to a yeast splicing extract and the first step of splicing yields the 5' exon and the lariat intron-3' exon intermediate (this RNA), which both remain associated with the spliceosome. Source: (natural) ![]() ![]() |
#4: RNA chain | Mass: 376267.406 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#5: RNA chain | Mass: 35883.176 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
-Pre-mRNA-splicing factor ... , 6 types, 6 molecules AFCLNR
#6: Protein | Mass: 279867.469 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae / References: UniProt: P33334 |
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#8: Protein | Mass: 20412.477 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae / References: UniProt: P53854 |
#9: Protein | Mass: 114174.008 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae / References: UniProt: P36048 |
#14: Protein | Mass: 18484.502 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#16: Protein | Mass: 40988.590 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae / References: UniProt: P38241 |
#19: Protein | Mass: 15793.596 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae / References: UniProt: Q03375 |
-Protein , 12 types, 13 molecules DGHJKMOPSTbkx
#7: Protein | Mass: 32371.086 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae / References: UniProt: P28320 | ||
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#10: Protein | Mass: 28120.896 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() | ||
#11: Protein | Mass: 69118.984 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() | ||
#12: Protein | Mass: 50801.316 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() | ||
#13: Protein | Mass: 42548.727 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() | ||
#15: Protein | Mass: 38458.508 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() | ||
#17: Protein | Mass: 67819.789 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() | ||
#18: Protein | Mass: 19970.195 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() | ||
#20: Protein | Mass: 82532.867 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() | ||
#21: Protein | Mass: 100356.141 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() | ||
#22: Protein | Mass: 22426.990 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae / References: UniProt: P40018 #31: Protein | | Mass: 11251.861 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
-Small nuclear ribonucleoprotein ... , 6 types, 12 molecules dnepfqgrhljm
#23: Protein | Mass: 11240.139 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae / References: UniProt: P43321 #24: Protein | Mass: 10385.098 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae / References: UniProt: Q12330 #25: Protein | Mass: 9669.945 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #26: Protein | Mass: 8490.809 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae / References: UniProt: P40204 #27: Protein | Mass: 16296.798 Da / Num. of mol.: 2 / Source method: isolated from a natural source Details: MKLVNFLKKLRNEQVTIELKNGTTVWGTLQSVSPQMNAILTDVKLTLPQPRLNKLNSNGIAMASLYLTGGQQPTASDNIA SLQYINIRGNTIRQIILPDSLNLDSLLVDQKQLNSLRRSGQIANDPSKKRRRDFGAPANKRPRRGL Source: (natural) Saccharomyces cerevisiae / References: UniProt: Q02260 #28: Protein | Mass: 12876.066 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae / References: UniProt: Q06217 |
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-U2 small nuclear ribonucleoprotein ... , 2 types, 2 molecules WY
#29: Protein | Mass: 27232.252 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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#30: Protein | Mass: 12850.944 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae / References: UniProt: P40567 |
-Non-polymers , 3 types, 10 molecules ![](data/chem/img/MG.gif)
![](data/chem/img/ZN.gif)
![](data/chem/img/GTP.gif)
![](data/chem/img/ZN.gif)
![](data/chem/img/GTP.gif)
#32: Chemical | #33: Chemical | ChemComp-ZN / #34: Chemical | ChemComp-GTP / | |
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-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: Spliceosome immediately after branching / Type: COMPLEX Details: Splicing extract was prepared from Prp18-HA or Slu7-TAPS yeast strains. An in vitro transcribed yeast UBC4 pre-mRNA substrate (with 2 x MS2 bacteriophage coat protein-binding stem loops at ...Details: Splicing extract was prepared from Prp18-HA or Slu7-TAPS yeast strains. An in vitro transcribed yeast UBC4 pre-mRNA substrate (with 2 x MS2 bacteriophage coat protein-binding stem loops at the 5' end and with the 3'-splice site sequence UAGAG mutated to UACAC) was pre-bound to an MS2-maltose binding protein fusion protein. This substrate-protein complex was added to the splicing extract. The splicing reaction proceeded through the first step but the second step was blocked by the 3' splice site mutation. Substrate-bound spliceosomes from the splicing extract were purified on amylose resin and eluted with maltose. Subsequently the spliceosomes were captured on anti-HA-agarose (for Prp18-HA-tagged) or streptactin resin (for Slu7-TAPS tagged) and eluted with HA peptide or desthiobiotin, respectively. Purified spliceosomes were then dialysed against 20 mM HEPES KOH pH 7.8, 75 mM KCl, 0.25 mM EDTA Entity ID: #1-#31 / Source: NATURAL | ||||||||||||||||||||||||||||||
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Molecular weight | Value: 2 MDa / Experimental value: NO | ||||||||||||||||||||||||||||||
Source (natural) | Organism: ![]() ![]() | ||||||||||||||||||||||||||||||
Buffer solution | pH: 7.8 | ||||||||||||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 0.3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||||||||||||
Specimen support | Grid material: COPPER / Grid mesh size: 400 divisions/in. / Grid type: Quantifoil R2/2 | ||||||||||||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK III / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K Details: 3 microlitres sample were applied to the grid, left for 30 seconds and then blotted for 2.5-3.0 seconds before plunging. |
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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 magnification: 81000 X / Calibrated magnification: 35714 X / Nominal defocus max: 4000 nm / Nominal defocus min: 500 nm |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Average exposure time: 0.8 sec. / Electron dose: 2 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 QUANTUM (4k x 4k) / Num. of real images: 2213 Details: Total dose: 40 electrons/Angstrom^2 over 16 seconds. 20 movie frames collected at 1.25 frames per second. |
EM imaging optics | Energyfilter name: GIF Quantum |
Image scans | Movie frames/image: 20 / Used frames/image: 1-20 |
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Processing
Software | Name: REFMAC / Version: 5.8.0124 / Classification: refinement | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 248000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 93106 / Num. of class averages: 1 / Symmetry type: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | Protocol: OTHER / Space: RECIPROCAL Details: Used secondary structure restraints generated in ProSMART and LibG. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement | Resolution: 3.8→274.56 Å / Cor.coef. Fo:Fc: 0.954 / SU B: 27.594 / SU ML: 0.398 / ESU R: 0.522 Stereochemistry target values: MAXIMUM LIKELIHOOD WITH PHASES Details: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
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Solvent computation | Solvent model: PARAMETERS FOR MASK CACLULATION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 180.1 Å2
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Refinement step | Cycle: 1 / Total: 63166 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refine LS restraints |
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