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- EMDB-0951: Cryo-EM structure of 90S small subunit preribosomes in transition... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-0951 | |||||||||
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Title | Cryo-EM structure of 90S small subunit preribosomes in transition states (State C) | |||||||||
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![]() | 90S pre-ribosome (Dhr1-depleted, state C)
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Function / homology | ![]() rRNA acetylation involved in maturation of SSU-rRNA / Noc4p-Nop14p complex / rRNA cytidine N-acetyltransferase activity / CURI complex / t-UTP complex / tRNA acetylation / UTP-C complex / endonucleolytic cleavage in ITS1 upstream of 5.8S rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / Pwp2p-containing subcomplex of 90S preribosome / sno(s)RNA processing ...rRNA acetylation involved in maturation of SSU-rRNA / Noc4p-Nop14p complex / rRNA cytidine N-acetyltransferase activity / CURI complex / t-UTP complex / tRNA acetylation / UTP-C complex / endonucleolytic cleavage in ITS1 upstream of 5.8S rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / Pwp2p-containing subcomplex of 90S preribosome / sno(s)RNA processing / RNA fragment catabolic process / ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | |||||||||
Biological species | ![]() ![]() ![]() ![]() ![]() ![]() | |||||||||
Method | ![]() ![]() | |||||||||
![]() | Du Y / Ye K | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Cryo-EM structure of 90 small ribosomal subunit precursors in transition states. Authors: Yifei Du / Weidong An / Xing Zhu / Qi Sun / Jia Qi / Keqiong Ye / ![]() Abstract: The 90 preribosome is a large, early assembly intermediate of small ribosomal subunits that undergoes structural changes to give a pre-40 ribosome. Here, we gained insight into this transition by ...The 90 preribosome is a large, early assembly intermediate of small ribosomal subunits that undergoes structural changes to give a pre-40 ribosome. Here, we gained insight into this transition by determining cryo-electron microscopy structures of intermediates in the path from the 90 to the pre-40 The full transition is blocked by deletion of RNA helicase Dhr1. A series of structural snapshots revealed that the excised 5' external transcribed spacer (5' ETS) is degraded within 90, driving stepwise disassembly of assembly factors and ribosome maturation. The nuclear exosome, an RNA degradation machine, docks on the 90 through helicase Mtr4 and is primed to digest the 3' end of the 5' ETS. The structures resolved between 3.2- and 8.6-angstrom resolution reveal key intermediates and the critical role of 5' ETS degradation in 90 progression. | |||||||||
Validation Report | ![]() ![]() ![]() ![]() | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
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Download
Header (meta data in XML format) |
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Images |
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Archive directory |
-Related structure data
Related structure data | ![]() 6lqrCM ![]() 0949C ![]() 0950C ![]() 0952C ![]() 0953C ![]() 0954C ![]() 0955C ![]() 6lqpC ![]() 6lqqC ![]() 6lqsC ![]() 6lqtC ![]() 6lquC ![]() 6lqvC C: citing same article ( M: atomic model generated by this map |
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Similar-shape strucutres |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.334 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 90S pre-ribosome (Dhr1-depleted, state C)
+Component #1: protein, 90S pre-ribosome (Dhr1-depleted, state C)
+Component #2: nucleic-acid, U3 snoRNA
+Component #3: nucleic-acid, 5' ETS
+Component #4: nucleic-acid, 18S pre-rRNA
+Component #5: protein, 40S ribosomal protein S1-A
+Component #6: protein, 40S ribosomal protein S4-A
+Component #7: protein, 40S ribosomal protein S5
+Component #8: protein, 40S ribosomal protein S6-A
+Component #9: protein, 40S ribosomal protein S7-A
+Component #10: protein, 40S ribosomal protein S8-A
+Component #11: protein, 40S ribosomal protein S9-A
+Component #12: protein, 40S ribosomal protein S11-A
+Component #13: protein, 40S ribosomal protein S13
+Component #14: protein, 40S ribosomal protein S14-A
+Component #15: protein, 40S ribosomal protein S16-A
+Component #16: protein, 40S ribosomal protein S22-B
+Component #17: protein, 40S ribosomal protein S23-A
+Component #18: protein, 40S ribosomal protein S24-A
+Component #19: protein, 40S ribosomal protein S27-A
+Component #20: protein, 40S ribosomal protein S28-A
+Component #21: protein, rRNA 2'-O-methyltransferase fibrillarin
+Component #22: protein, Nucleolar protein 56
+Component #23: protein, Nucleolar protein 58
+Component #24: protein, Ribosomal RNA-processing protein 9
+Component #25: protein, 13 kDa ribonucleoprotein-associated protein
+Component #26: protein, U3 small nucleolar RNA-associated protein 4
+Component #27: protein, U3 small nucleolar RNA-associated protein 5
+Component #28: protein, U3 small nucleolar RNA-associated protein 8
+Component #29: protein, U3 small nucleolar RNA-associated protein 9
+Component #30: protein, U3 small nucleolar RNA-associated protein 10
+Component #31: protein, U3 small nucleolar RNA-associated protein 15
+Component #32: protein, NET1-associated nuclear protein 1
+Component #33: protein, Periodic tryptophan protein 2
+Component #34: protein, U3 small nucleolar RNA-associated protein 12
+Component #35: protein, U3 small nucleolar RNA-associated protein 13
+Component #36: protein, U3 small nucleolar RNA-associated protein 18
+Component #37: protein, U3 small nucleolar RNA-associated protein 21
+Component #38: protein, U3 small nucleolar RNA-associated protein 6
+Component #39: protein, Bud site selection protein 21
+Component #40: protein, U3 small nucleolar RNA-associated protein 7
+Component #41: protein, U3 small nucleolar RNA-associated protein 11
+Component #42: protein, U3 small nucleolar RNA-associated protein MPP10
+Component #43: protein, U3 small nucleolar ribonucleoprotein protein IMP3
+Component #44: protein, U3 small nucleolar ribonucleoprotein protein IMP4
+Component #45: protein, Something about silencing protein 10
+Component #46: protein, Protein SOF1
+Component #47: protein, rRNA-processing protein FCF2
+Component #48: protein, rRNA-processing protein FCF1
+Component #49: protein, Ribosome biogenesis protein ENP2
+Component #50: protein, U3 small nucleolar ribonucleoprotein protein LCP5
+Component #51: protein, rRNA biogenesis protein RRP5
+Component #52: protein, U3 small nucleolar RNA-associated protein 22
+Component #53: protein, Ribosomal RNA-processing protein 7
+Component #54: protein, Ribosomal RNA small subunit methyltransferase NEP1
+Component #55: protein, Ribosome biogenesis protein BMS1
+Component #56: protein, RNA 3'-terminal phosphate cyclase-like protein
+Component #57: protein, RNA cytidine acetyltransferase
+Component #58: protein, Nucleolar complex protein 14
+Component #59: protein, Nucleolar complex protein 4
+Component #60: protein, U3 small nucleolar RNA-associated protein 20
+Component #61: protein, U3 small nucleolar RNA-associated protein 14
+Component #62: protein, Essential nuclear protein 1
+Component #63: protein, Pno1
+Component #64: protein, Protein BFR2
+Component #65: protein, Unassigned helices
+Component #66: ligand, ZINC ION
+Component #67: ligand, GUANOSINE-5'-TRIPHOSPHATE
+Component #68: ligand, MAGNESIUM ION
-Experimental details
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Sample preparation
Specimen | Specimen state: Particle / Method: ![]() |
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Sample solution | Specimen conc.: 2 mg/mL / pH: 7.4 |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Temperature: 277 K / Humidity: 100 % |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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![]() | Microscope: FEI TITAN KRIOS |
Electron gun | Electron source: FIELD EMISSION GUN![]() |
Lens | Cs: 2.7 mm / Imaging mode: BRIGHT FIELD![]() |
Specimen Holder | Model: FEI TITAN KRIOS AUTOGRID HOLDER |
Camera | Detector: GATAN K2 SUMMIT (4k x 4k) |
-Image acquisition
Image acquisition | Number of digital images: 18028 |
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Image processing
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3D reconstruction | Software: RELION / Resolution: 8.6 Å / Resolution method: FSC 0.143 CUT-OFF |