[English] 日本語
![](img/lk-miru.gif)
- EMDB-4055: Overall map of the yeast spliceosome immediately after branching -
+
Open data
-
Basic information
Entry | Database: EMDB / ID: EMD-4055 | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Title | Overall map of the yeast spliceosome immediately after branching | |||||||||
![]() | Spliceosome captured immediately after first catalytic step | |||||||||
![]() |
| |||||||||
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 / U4/U6 snRNP / spliceosome conformational change to release U4 (or U4atac) and U1 (or U11) / 7-methylguanosine cap hypermethylation ...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 / U4/U6 snRNP / spliceosome conformational change to release U4 (or U4atac) and U1 (or U11) / 7-methylguanosine cap hypermethylation / Prp19 complex / snRNP binding / pICln-Sm protein complex / small nuclear ribonucleoprotein complex / pre-mRNA binding / U2-type catalytic step 1 spliceosome / SMN-Sm protein complex / spliceosomal tri-snRNP complex / mRNA cis splicing, via spliceosome / U2-type spliceosomal complex / poly(U) RNA binding / 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 / mRNA 3'-splice site recognition / Dual incision in TC-NER / DNA replication initiation / spliceosomal tri-snRNP complex assembly / 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 / spliceosomal complex / mRNA splicing, via spliceosome / metallopeptidase activity / GTPase activity / mRNA binding / chromatin binding / chromatin / GTP binding / DNA binding / RNA binding / nucleus / metal ion binding / cytosol / cytoplasm Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.8 Å | |||||||||
![]() | Galej WP / Wilkinson MF / Fica SM / Oubridge C / Newman AJ / 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. | |||||||||
History |
|
-
Structure visualization
Movie |
![]() |
---|---|
Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
-
Downloads & links
-EMDB archive
Map data | ![]() | 249.7 MB | ![]() | |
---|---|---|---|---|
Header (meta data) | ![]() ![]() | 51.2 KB 51.2 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 14.5 KB | Display | ![]() |
Images | ![]() | 50.8 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 5lj3MC ![]() 4056C ![]() 4057C ![]() 4058C ![]() 4059C ![]() 5lj5C M: atomic model generated by this map C: citing same article ( |
---|---|
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]) |
-
Links
EMDB pages | ![]() ![]() |
---|---|
Related items in Molecule of the Month |
-
Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Annotation | Spliceosome captured immediately after first catalytic step | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.43 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
|
-Supplemental data
-
Sample components
+Entire : Spliceosome immediately after branching
+Supramolecule #1: Spliceosome immediately after branching
+Macromolecule #1: U5 snRNA (small nuclear RNA)
+Macromolecule #2: Exon 1 (5' exon) of UBC4 pre-mRNA
+Macromolecule #3: Intron of UBC4 pre-mRNA
+Macromolecule #4: U2 snRNA (small nuclear RNA)
+Macromolecule #5: U6 snRNA (small nuclear RNA)
+Macromolecule #6: Pre-mRNA-splicing factor 8
+Macromolecule #7: Protein CWC16
+Macromolecule #8: Pre-mRNA-splicing factor CWC25
+Macromolecule #9: Pre-mRNA-splicing factor SNU114
+Macromolecule #10: ISY1
+Macromolecule #11: CWC22
+Macromolecule #12: PRP46
+Macromolecule #13: Pre-mRNA-processing protein 45
+Macromolecule #14: Pre-mRNA-splicing factor BUD31
+Macromolecule #15: CWC2
+Macromolecule #16: Pre-mRNA-splicing factor SLT11
+Macromolecule #17: CEF1
+Macromolecule #18: CWC15
+Macromolecule #19: Pre-mRNA-splicing factor CWC21
+Macromolecule #20: CLF1
+Macromolecule #21: SYF1
+Macromolecule #22: Small nuclear ribonucleoprotein-associated protein B
+Macromolecule #23: Small nuclear ribonucleoprotein Sm D3
+Macromolecule #24: Small nuclear ribonucleoprotein E
+Macromolecule #25: Small nuclear ribonucleoprotein F
+Macromolecule #26: Small nuclear ribonucleoprotein G
+Macromolecule #27: Small nuclear ribonucleoprotein Sm D1
+Macromolecule #28: Small nuclear ribonucleoprotein Sm D2
+Macromolecule #29: U2 small nuclear ribonucleoprotein A'
+Macromolecule #30: U2 small nuclear ribonucleoprotein B''
+Macromolecule #31: unknown
+Macromolecule #32: MAGNESIUM ION
+Macromolecule #33: ZINC ION
+Macromolecule #34: GUANOSINE-5'-TRIPHOSPHATE
-Experimental details
-Structure determination
Method | cryo EM |
---|---|
![]() | single particle reconstruction |
Aggregation state | particle |
-
Sample preparation
Concentration | 0.3 mg/mL | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Buffer | pH: 7.8 Component:
| ||||||||||||
Grid | Model: Quantifoil R2/2 / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: CONTINUOUS / Support film - Film thickness: 6.0 nm / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR | ||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK III Details: 3 microlitres sample were applied to the grid, left for 30 seconds and then blotted for 2.5-3.0 seconds before plunging.. |
-
Electron microscopy
Microscope | FEI TITAN KRIOS |
---|---|
Specialist optics | Energy filter - Name: GIF Quantum |
Image recording | Film or detector model: GATAN K2 QUANTUM (4k x 4k) / Detector mode: SUPER-RESOLUTION / Digitization - Frames/image: 1-20 / Number real images: 2213 / Average exposure time: 0.8 sec. / Average electron dose: 2.0 e/Å2 Details: Total dose: 40 electrons/Angstrom^2 over 16 seconds. 20 movie frames collected at 1.25 frames per second. |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Calibrated magnification: 35714 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 4.0 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 81000 |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
+
Image processing
-Atomic model buiding 1
Details | Used secondary structure restraints generated in ProSMART and LibG. |
---|---|
Refinement | Space: RECIPROCAL / Protocol: OTHER |
Output model | ![]() PDB-5lj3: |