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Yorodumi- EMDB-18225: cryo-EM structure of the human spliceosomal B complex protomer (t... -
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Basic information
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| Title | cryo-EM structure of the human spliceosomal B complex protomer (tri-snRNP core region) | |||||||||
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Keywords | spliceosome / pre-catalytic spliceosome / spliceosomal B complex / SPLICING | |||||||||
| Function / homology | Function and homology informationmicrofibril / spliceosomal snRNP complex / ribonucleoprotein complex localization / U4atac snRNP / positive regulation of cytotoxic T cell differentiation / maturation of 5S rRNA / RNA localization / U4atac snRNA binding / box C/D sno(s)RNA binding / dense fibrillar component ...microfibril / spliceosomal snRNP complex / ribonucleoprotein complex localization / U4atac snRNP / positive regulation of cytotoxic T cell differentiation / maturation of 5S rRNA / RNA localization / U4atac snRNA binding / box C/D sno(s)RNA binding / dense fibrillar component / box C/D methylation guide snoRNP complex / U4/U6 snRNP / U2-type catalytic step 1 spliceosome / RNA splicing, via transesterification reactions / snRNP binding / transcription elongation factor activity / proline-rich region binding / U4 snRNA binding / spliceosomal tri-snRNP complex / mRNA cis splicing, via spliceosome / U2-type precatalytic spliceosome / RNA polymerase binding / U2-type prespliceosome assembly / U2-type spliceosomal complex / U2-type catalytic step 2 spliceosome / box C/D snoRNP assembly / U2 snRNP / U4 snRNP / U2-type prespliceosome / : / U3 snoRNA binding / K63-linked polyubiquitin modification-dependent protein binding / ubiquitin-like protein conjugating enzyme binding / rRNA modification in the nucleus and cytosol / precatalytic spliceosome / spliceosomal complex assembly / mRNA 3'-splice site recognition / mRNA Splicing - Minor Pathway / spliceosomal tri-snRNP complex assembly / MLL1 complex / negative regulation of transcription elongation by RNA polymerase II / U5 snRNA binding / U5 snRNP / U2 snRNA binding / U6 snRNA binding / pre-mRNA intronic binding / spliceosomal snRNP assembly / single fertilization / ribonucleoprotein complex binding / U1 snRNA binding / RNA processing / Major pathway of rRNA processing in the nucleolus and cytosol / Cajal body / U4/U6 x U5 tri-snRNP complex / catalytic step 2 spliceosome / mRNA Splicing - Major Pathway / RNA splicing / nuclear receptor binding / transcription coregulator activity / response to cocaine / spliceosomal complex / maturation of SSU-rRNA / positive regulation of transcription elongation by RNA polymerase II / small-subunit processome / mRNA splicing, via spliceosome / protein modification process / cellular response to xenobiotic stimulus / protein tag activity / mRNA processing / cellular response to tumor necrosis factor / transcription corepressor activity / cellular response to lipopolysaccharide / microtubule cytoskeleton / ATPase binding / ribosomal small subunit biogenesis / protein-macromolecule adaptor activity / RNA polymerase II-specific DNA-binding transcription factor binding / transcription coactivator activity / nuclear speck / ciliary basal body / cell division / intracellular membrane-bounded organelle / GTPase activity / centrosome / chromatin / GTP binding / nucleolus / negative regulation of transcription by RNA polymerase II / Golgi apparatus / positive regulation of transcription by RNA polymerase II / protein-containing complex / DNA binding / RNA binding / zinc ion binding / nucleoplasm / identical protein binding / nucleus / membrane / cytosol / cytoplasm Similarity search - Function | |||||||||
| Biological species | Homo sapiens (human) | |||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 3.1 Å | |||||||||
Authors | Zhang Z / Kumar V / Dybkov O / Will CL / Urlaub H / Stark H / Luehrmann R | |||||||||
| Funding support | Germany, 1 items
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Citation | Journal: EMBO J / Year: 2024Title: Cryo-EM analyses of dimerized spliceosomes provide new insights into the functions of B complex proteins. Authors: Zhenwei Zhang / Vinay Kumar / Olexandr Dybkov / Cindy L Will / Henning Urlaub / Holger Stark / Reinhard Lührmann / ![]() Abstract: The B complex is a key intermediate stage of spliceosome assembly. To improve the structural resolution of monomeric, human spliceosomal B (hB) complexes and thereby generate a more comprehensive hB ...The B complex is a key intermediate stage of spliceosome assembly. To improve the structural resolution of monomeric, human spliceosomal B (hB) complexes and thereby generate a more comprehensive hB molecular model, we determined the cryo-EM structure of B complex dimers formed in the presence of ATP S. The enhanced resolution of these complexes allows a finer molecular dissection of how the 5' splice site (5'ss) is recognized in hB, and new insights into molecular interactions of FBP21, SNU23 and PRP38 with the U6/5'ss helix and with each other. It also reveals that SMU1 and RED are present as a heterotetrameric complex and are located at the interface of the B dimer protomers. We further show that MFAP1 and UBL5 form a 5' exon binding channel in hB, and elucidate the molecular contacts stabilizing the 5' exon at this stage. Our studies thus yield more accurate models of protein and RNA components of hB complexes. They further allow the localization of additional proteins and protein domains (such as SF3B6, BUD31 and TCERG1) whose position was not previously known, thereby uncovering new functions for B-specific and other hB proteins during pre-mRNA splicing. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_18225.map.gz | 493.2 MB | EMDB map data format | |
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| Header (meta data) | emd-18225-v30.xml emd-18225.xml | 40.4 KB 40.4 KB | Display Display | EMDB header |
| FSC (resolution estimation) | emd_18225_fsc.xml | 18.3 KB | Display | FSC data file |
| Images | emd_18225.png | 40.6 KB | ||
| Filedesc metadata | emd-18225.cif.gz | 13.2 KB | ||
| Others | emd_18225_half_map_1.map.gz emd_18225_half_map_2.map.gz | 428.4 MB 428.4 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-18225 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-18225 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 8q7nMC ![]() 8qo9C M: atomic model generated by this map C: citing same article ( |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
| EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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| Related items in Molecule of the Month |
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Map
| File | Download / File: emd_18225.map.gz / Format: CCP4 / Size: 536.4 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 1.16 Å | ||||||||||||||||||||||||||||||||||||
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
-Half map: #2
| File | emd_18225_half_map_1.map | ||||||||||||
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| Density Histograms |
-Half map: #1
| File | emd_18225_half_map_2.map | ||||||||||||
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| Density Histograms |
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Sample components
+Entire : human pre-catalytic spliceosome
+Supramolecule #1: human pre-catalytic spliceosome
+Macromolecule #1: U5 snRNA
+Macromolecule #2: U6 snRNA
+Macromolecule #11: MINX pre-mRNA
+Macromolecule #20: U4 snRNA
+Macromolecule #3: Splicing factor 3A subunit 1
+Macromolecule #4: 116 kDa U5 small nuclear ribonucleoprotein component
+Macromolecule #5: Thioredoxin-like protein 4A
+Macromolecule #6: Pre-mRNA-splicing factor 38A
+Macromolecule #7: Microfibrillar-associated protein 1
+Macromolecule #8: NHP2-like protein 1, N-terminally processed
+Macromolecule #9: Protein BUD31 homolog
+Macromolecule #10: WW domain-binding protein 4
+Macromolecule #12: Zinc finger matrin-type protein 2
+Macromolecule #13: Ubiquitin-like protein 5
+Macromolecule #14: U4/U6 small nuclear ribonucleoprotein Prp31
+Macromolecule #15: U4/U6 small nuclear ribonucleoprotein Prp4
+Macromolecule #16: Pre-mRNA-processing factor 6
+Macromolecule #17: Pre-mRNA-processing-splicing factor 8
+Macromolecule #18: U4/U6.U5 tri-snRNP-associated protein 1
+Macromolecule #19: Transcription elongation regulator 1
+Macromolecule #21: U4/U6 small nuclear ribonucleoprotein Prp3
-Experimental details
-Structure determination
| Method | cryo EM |
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Processing | single particle reconstruction |
| Aggregation state | particle |
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Sample preparation
| Buffer | pH: 7.9 |
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| Vitrification | Cryogen name: ETHANE |
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Electron microscopy
| Microscope | FEI TITAN KRIOS |
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| Image recording | Film or detector model: FEI FALCON III (4k x 4k) / Detector mode: INTEGRATING / Average electron dose: 48.0 e/Å2 |
| Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
| Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 3.0 µm / Nominal defocus min: 1.5 µm |
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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About Yorodumi



Keywords
Homo sapiens (human)
Authors
Germany, 1 items
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Processing
FIELD EMISSION GUN

