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- EMDB-6569: The cryo-EM structure of yeast spliceosomal U4/U6.U5 tri-snRNP (i... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-6569 | |||||||||
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Title | The cryo-EM structure of yeast spliceosomal U4/U6.U5 tri-snRNP (improved map for U5 RNA region at 3.70 A) | |||||||||
![]() | Reconstruction of tri-snRNP | |||||||||
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Function / homology | ![]() spliceosomal conformational changes to generate catalytic conformation / mRNA decay by 5' to 3' exoribonuclease / snoRNA splicing / snoRNA guided rRNA 2'-O-methylation / Lsm1-7-Pat1 complex / U6 snRNP / positive regulation of primary miRNA processing / positive regulation of RNA binding / box C/D sno(s)RNA 3'-end processing / generation of catalytic spliceosome for first transesterification step ...spliceosomal conformational changes to generate catalytic conformation / mRNA decay by 5' to 3' exoribonuclease / snoRNA splicing / snoRNA guided rRNA 2'-O-methylation / Lsm1-7-Pat1 complex / U6 snRNP / positive regulation of primary miRNA processing / positive regulation of RNA binding / box C/D sno(s)RNA 3'-end processing / generation of catalytic spliceosome for first transesterification step / deadenylation-dependent decapping of nuclear-transcribed mRNA / ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() | |||||||||
Method | ![]() ![]() | |||||||||
![]() | Wan R / Yan C / Bai R / Wang L / Huang M / Wong C / Shi Y | |||||||||
![]() | ![]() Title: The 3.8 Å structure of the U4/U6.U5 tri-snRNP: Insights into spliceosome assembly and catalysis. Authors: Ruixue Wan / Chuangye Yan / Rui Bai / Lin Wang / Min Huang / Catherine C L Wong / Yigong Shi / ![]() Abstract: Splicing of precursor messenger RNA is accomplished by a dynamic megacomplex known as the spliceosome. Assembly of a functional spliceosome requires a preassembled U4/U6.U5 tri-snRNP complex, which ...Splicing of precursor messenger RNA is accomplished by a dynamic megacomplex known as the spliceosome. Assembly of a functional spliceosome requires a preassembled U4/U6.U5 tri-snRNP complex, which comprises the U5 small nuclear ribonucleoprotein (snRNP), the U4 and U6 small nuclear RNA (snRNA) duplex, and a number of protein factors. Here we report the three-dimensional structure of a Saccharomyces cerevisiae U4/U6.U5 tri-snRNP at an overall resolution of 3.8 angstroms by single-particle electron cryomicroscopy. The local resolution for the core regions of the tri-snRNP reaches 3.0 to 3.5 angstroms, allowing construction of a refined atomic model. Our structure contains U5 snRNA, the extensively base-paired U4/U6 snRNA, and 30 proteins including Prp8 and Snu114, which amount to 8495 amino acids and 263 nucleotides with a combined molecular mass of ~1 megadalton. The catalytic nucleotide U80 from U6 snRNA exists in an inactive conformation, stabilized by its base-pairing interactions with U4 snRNA and protected by Prp3. Pre-messenger RNA is bound in the tri-snRNP through base-pairing interactions with U6 snRNA and loop I of U5 snRNA. This structure, together with that of the spliceosome, reveals the molecular choreography of the snRNAs in the activation process of the spliceosomal ribozyme. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 116.4 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 10.1 KB 10.1 KB | Display Display | ![]() |
Images | ![]() ![]() | 55.5 KB 3.5 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 3jcmMC ![]() 6561C ![]() 6562C ![]() 6563C ![]() 6564C ![]() 6565C ![]() 6566C ![]() 6567C ![]() 6568C ![]() 6570C ![]() 6571C ![]() 6572C ![]() 6573C C: citing same article ( M: atomic model generated by this map |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | Reconstruction of tri-snRNP | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.32 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : U4/U6.U5 tri-snRNP from Saccharomyces cerevisiae
Entire | Name: U4/U6.U5 tri-snRNP from Saccharomyces cerevisiae |
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Components |
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-Supramolecule #1000: U4/U6.U5 tri-snRNP from Saccharomyces cerevisiae
Supramolecule | Name: U4/U6.U5 tri-snRNP from Saccharomyces cerevisiae / type: sample / ID: 1000 / Number unique components: 34 |
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-Supramolecule #1: U4/U6.U5 tri-snRNP
Supramolecule | Name: U4/U6.U5 tri-snRNP / type: organelle_or_cellular_component / ID: 1 / Recombinant expression: No / Database: NCBI |
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Source (natural) | Organism: ![]() ![]() ![]() |
-Experimental details
-Structure determination
Method | ![]() |
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Aggregation state | particle |
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Sample preparation
Vitrification | Cryogen name: ETHANE / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD![]() |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Date | Aug 8, 2015 |
Image recording | Category: FILM / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Digitization - Scanner: TEMSCAN / Number real images: 3141 |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 3.77 Å / Resolution method: OTHER / Software - Name: RELION / Number images used: 172134 |
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