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Yorodumi- EMDB-66681: Cryo-EM structure of the pre-40S ribosome (Enp1-Rrp12 WT) from Ch... -
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Basic information
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| Title | Cryo-EM structure of the pre-40S ribosome (Enp1-Rrp12 WT) from Chaetomium thermophilum, state Tsr1-3 | |||||||||
Map data | local resolution filtered map using Relion | |||||||||
Sample |
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Keywords | 90S pre-ribosome / Rrp12 / Enp1 / ribosome biogenesis / RIBOSOME | |||||||||
| Function / homology | Function and homology informationrRNA (guanine-N7)-methylation / rRNA (guanine) methyltransferase activity / endonucleolytic cleavage of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / U3 snoRNA binding / preribosome, small subunit precursor / 90S preribosome / cytosolic ribosome / methyltransferase activity / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / small-subunit processome ...rRNA (guanine-N7)-methylation / rRNA (guanine) methyltransferase activity / endonucleolytic cleavage of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / U3 snoRNA binding / preribosome, small subunit precursor / 90S preribosome / cytosolic ribosome / methyltransferase activity / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / small-subunit processome / rRNA processing / ribosomal small subunit assembly / ribosome biogenesis / ribosomal small subunit biogenesis / small ribosomal subunit / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / methylation / cytoplasmic translation / rRNA binding / structural constituent of ribosome / ribosome / translation / ribonucleoprotein complex / GTPase activity / GTP binding / nucleolus / RNA binding / cytoplasm / cytosol Similarity search - Function | |||||||||
| Biological species | Thermochaetoides thermophila (fungus) | |||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 3.2 Å | |||||||||
Authors | Lau B / Li Y / Zhu J / Fischer P / Hong X / Yuan R / Beckmann R / Hurt E / Cheng J | |||||||||
| Funding support | 1 items
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Citation | Journal: Cell Rep / Year: 2026Title: Nucleoplasmic checkpoint of the 40S ribosomal decoding center maturation. Authors: Benjamin Lau / Yi Li / Jingyi Zhu / Xianwen Ye / Paulina Fischer / Xiaying Hong / Rui Yuan / Roland Beckmann / Ed Hurt / Jingdong Cheng / ![]() Abstract: The decoding center (DC) is a key ribosomal structure for accurate translation, assembled in a multi-step process that starts on nucleolar pre-ribosomes and ends in the cytoplasm. While late ...The decoding center (DC) is a key ribosomal structure for accurate translation, assembled in a multi-step process that starts on nucleolar pre-ribosomes and ends in the cytoplasm. While late cytoplasmic steps and their checkpoint mechanisms are well characterized, the regulation of early nucleoplasmic DC assembly is unclear. Here, we show that the essential assembly factor Rrp12 plays a central coordinating role. Using Chaetomium thermophilum and cryo-electron microscopy analyses of fifteen pre-40S intermediates, we demonstrate that Rrp12 C terminus truncation: (1) inhibits release of the Utp14-Dhr1 pair, (2) displaces Tsr1, (3) promotes premature stabilization of h28, and (4) prevents h44 formation. These defects impair final 18S rRNA processing and prematurely activate the quality control kinase Rio1. Our results reveal a nucleoplasmic checkpoint during DC formation and establish Rrp12 as a critical regulator ensuring accurate assembly and orderly ribosome maturation. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_66681.map.gz | 104 MB | EMDB map data format | |
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| Header (meta data) | emd-66681-v30.xml emd-66681.xml | 46.1 KB 46.1 KB | Display Display | EMDB header |
| FSC (resolution estimation) | emd_66681_fsc.xml | 12.7 KB | Display | FSC data file |
| Images | emd_66681.png | 123.2 KB | ||
| Filedesc metadata | emd-66681.cif.gz | 10.4 KB | ||
| Others | emd_66681_additional_1.map.gz emd_66681_additional_2.map.gz emd_66681_half_map_1.map.gz emd_66681_half_map_2.map.gz | 140.6 MB 157.6 MB 140.9 MB 140.7 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-66681 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-66681 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 9xabMC ![]() 9xa7C ![]() 9xa8C ![]() 9xa9C ![]() 9xaaC ![]() 9xacC ![]() 9xadC ![]() 9xaeC ![]() 9xafC ![]() 9xagC ![]() 9xahC ![]() 9xaiC ![]() 9xajC ![]() 9xakC 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_66681.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Annotation | local resolution filtered map using Relion | ||||||||||||||||||||||||||||||||||||
| Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 1.146 Å | ||||||||||||||||||||||||||||||||||||
| Density |
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
-Additional map: consensus refined map without post processing
| File | emd_66681_additional_1.map | ||||||||||||
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| Annotation | consensus refined map without post processing | ||||||||||||
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-Additional map: local resolution filtered map using deepEMhancer
| File | emd_66681_additional_2.map | ||||||||||||
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| Annotation | local resolution filtered map using deepEMhancer | ||||||||||||
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-Half map: half map
| File | emd_66681_half_map_1.map | ||||||||||||
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| Annotation | half map | ||||||||||||
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| Density Histograms |
-Half map: half map
| File | emd_66681_half_map_2.map | ||||||||||||
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| Annotation | half map | ||||||||||||
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Sample components
+Entire : pre-40S ribosome, state Tsr1-3
+Supramolecule #1: pre-40S ribosome, state Tsr1-3
+Macromolecule #1: Small ribosomal subunit protein uS2
+Macromolecule #2: Small ribosomal subunit protein eS1
+Macromolecule #3: Small ribosomal subunit protein uS5
+Macromolecule #4: 40S ribosomal protein S4
+Macromolecule #5: 40S ribosomal protein S6
+Macromolecule #6: 40S ribosomal protein S7
+Macromolecule #7: 40S ribosomal protein S8
+Macromolecule #8: 40S ribosomal protein s9-like protein
+Macromolecule #9: 40S ribosomal protein S11-like protein
+Macromolecule #10: 40S ribosomal protein S13-like protein
+Macromolecule #11: 40S ribosomal protein S14-like protein
+Macromolecule #12: 40S ribosomal protein S17-like protein
+Macromolecule #13: 40S ribosomal protein S21-like protein
+Macromolecule #14: 40S ribosomal protein S22-like protein
+Macromolecule #15: 40S ribosomal protein s23-like protein
+Macromolecule #16: Small ribosomal subunit protein eS24
+Macromolecule #17: Ribosomal protein s27-like protein
+Macromolecule #18: 40S ribosomal protein S30
+Macromolecule #20: Methyltransferase-like protein
+Macromolecule #21: Bms1-type G domain-containing protein
+Macromolecule #22: Pre-rRNA-processing protein PNO1
+Macromolecule #19: 18S rRNA
+Macromolecule #23: MAGNESIUM ION
+Macromolecule #24: ZINC ION
+Macromolecule #25: water
-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: 7.4 |
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| Vitrification | Cryogen name: ETHANE |
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Electron microscopy
| Microscope | TFS KRIOS |
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| Image recording | Film or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 50.0 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: 2.5 µm / Nominal defocus min: 1.0 µm |
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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About Yorodumi



Keywords
Thermochaetoides thermophila (fungus)
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Processing
FIELD EMISSION GUN


