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Yorodumi- EMDB-54131: Assembly intermediate of human mitochondrial ribosome small subun... -
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Basic information
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| Title | Assembly intermediate of human mitochondrial ribosome small subunit bound to METTL15 and RBFA (Inward conformation) (State M2) | |||||||||
Map data | Consensus map M15-RBFA-IN State M2 | |||||||||
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Keywords | mitochondrial gene expression / mitoribosome / mitoribosome assembly factors / cryoEM / RIBOSOME | |||||||||
| Function / homology | Function and homology informationrRNA (cytosine-N4-)-methyltransferase activity / mitochondrial small ribosomal subunit assembly / mitochondrial ribosome assembly / Mitochondrial translation elongation / Mitochondrial translation initiation / Mitochondrial ribosome-associated quality control / Mitochondrial translation termination / rRNA base methylation / mitochondrial ribosome / mitochondrial small ribosomal subunit ...rRNA (cytosine-N4-)-methyltransferase activity / mitochondrial small ribosomal subunit assembly / mitochondrial ribosome assembly / Mitochondrial translation elongation / Mitochondrial translation initiation / Mitochondrial ribosome-associated quality control / Mitochondrial translation termination / rRNA base methylation / mitochondrial ribosome / mitochondrial small ribosomal subunit / mitochondrial translation / apoptotic mitochondrial changes / positive regulation of proteolysis / ribosomal small subunit binding / sperm head-tail coupling apparatus / Mitochondrial protein degradation / Transferases; Transferring one-carbon groups; Methyltransferases / apoptotic signaling pathway / rRNA processing / cell junction / regulation of translation / small ribosomal subunit / small ribosomal subunit rRNA binding / nuclear membrane / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / tRNA binding / cell population proliferation / mitochondrial inner membrane / rRNA binding / structural constituent of ribosome / ribosome / translation / mitochondrial matrix / protein domain specific binding / mRNA binding / GTPase activity / GTP binding / nucleolus / mitochondrion / RNA binding / nucleoplasm / nucleus / plasma membrane / cytoplasm / cytosol Similarity search - Function | |||||||||
| Biological species | Homo sapiens (human) | |||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 3.1 Å | |||||||||
Authors | Singh V / Shiriaev DI / Khawaja A / Rorbach J | |||||||||
| Funding support | Sweden, 1 items
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Citation | Journal: Nat Commun / Year: 2026Title: Pseudouridine synthase PUS1 and initiation factor mtIF2 are human mitoribosomal small subunit assembly factors. Authors: Vivek Singh / Dmitrii Shiriaev / Lorina Bilalli / Anas Khawaja / Joanna Rorbach / ![]() Abstract: Assembly of the mitochondrial ribosome (mitoribosome) is a crucial step in mitochondrial gene expression. This process facilitates mitochondrial translation, which produces essential subunits of the ...Assembly of the mitochondrial ribosome (mitoribosome) is a crucial step in mitochondrial gene expression. This process facilitates mitochondrial translation, which produces essential subunits of the oxidative phosphorylation machinery-the cell's primary energy-producing machinery. Disruptions in mitoribosome assembly can lead to severe human diseases. Given its fundamental importance, detailed structural analysis of mitoribosome assembly pathways is essential for advancing our understanding of mitochondrial function in both health and disease. In this study, we characterize twelve distinct assembly states of the mitoribosomal small subunit (mtSSU) isolated from human cells. Our findings reveal the intricate details of the final maturation stages of the mtSSU platform, decoding center, and the 3'-end of 12S rRNA. This process is governed by coordinated actions of assembly factors that ensure precise, stepwise rRNA folding and the integration of mitoribosomal proteins into the developing subunit. Our approach identifies pseudouridine synthase PUS1 and initiation factor mtIF2 as assembly factors, expanding their known roles beyond mt-tRNA maturation and translation, respectively. In addition, the identified assembly intermediates provide insight into the modular nature of mtSSU biogenesis in mitochondria and further link late-stage assembly to the acquisition of translational competence. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_54131.map.gz | 764.5 MB | EMDB map data format | |
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| Header (meta data) | emd-54131-v30.xml emd-54131.xml | 57.9 KB 57.9 KB | Display Display | EMDB header |
| Images | emd_54131.png | 113.5 KB | ||
| Filedesc metadata | emd-54131.cif.gz | 13.4 KB | ||
| Others | emd_54131_additional_1.map.gz emd_54131_half_map_1.map.gz emd_54131_half_map_2.map.gz | 23.1 MB 671 MB 671.4 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-54131 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-54131 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 9rovMC ![]() 51874 ![]() 9h51C ![]() 9h52C ![]() 9h54C ![]() 9h55C ![]() 9rorC ![]() 9rotC ![]() 9rpfC C: citing same article ( M: atomic model generated by this map |
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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_54131.map.gz / Format: CCP4 / Size: 824 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Annotation | Consensus map M15-RBFA-IN State M2 | ||||||||||||||||||||||||||||||||||||
| Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 0.825 Å | ||||||||||||||||||||||||||||||||||||
| Density |
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
-Additional map: #1
| File | emd_54131_additional_1.map | ||||||||||||
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-Half map: #1
| File | emd_54131_half_map_1.map | ||||||||||||
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-Half map: #2
| File | emd_54131_half_map_2.map | ||||||||||||
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Sample components
+Entire : Maturation state of mitochondria ribosomal 28S subunit.
+Supramolecule #1: Maturation state of mitochondria ribosomal 28S subunit.
+Macromolecule #1: 28S ribosomal protein S34, mitochondrial
+Macromolecule #2: 28S ribosomal protein S35, mitochondrial
+Macromolecule #3: Aurora kinase A-interacting protein
+Macromolecule #4: 28S ribosomal protein S2, mitochondrial
+Macromolecule #5: 28S ribosomal protein S24, mitochondrial
+Macromolecule #6: 28S ribosomal protein S6, mitochondrial
+Macromolecule #7: 28S ribosomal protein S7, mitochondrial
+Macromolecule #8: 28S ribosomal protein S10, mitochondrial
+Macromolecule #9: 28S ribosomal protein S11, mitochondrial
+Macromolecule #10: 28S ribosomal protein S12, mitochondrial
+Macromolecule #11: 28S ribosomal protein S14, mitochondrial
+Macromolecule #12: 28S ribosomal protein S15, mitochondrial
+Macromolecule #13: 28S ribosomal protein S16, mitochondrial
+Macromolecule #14: 28S ribosomal protein S17, mitochondrial
+Macromolecule #15: 28S ribosomal protein S18b, mitochondrial
+Macromolecule #16: 28S ribosomal protein S18c, mitochondrial
+Macromolecule #17: Small ribosomal subunit protein bS21m
+Macromolecule #18: 28S ribosomal protein S22, mitochondrial
+Macromolecule #19: 28S ribosomal protein S23, mitochondrial
+Macromolecule #20: 28S ribosomal protein S25, mitochondrial
+Macromolecule #21: 28S ribosomal protein S26, mitochondrial
+Macromolecule #22: 28S ribosomal protein S28, mitochondrial
+Macromolecule #23: 28S ribosomal protein S29, mitochondrial
+Macromolecule #24: 28S ribosomal protein S31, mitochondrial
+Macromolecule #25: 28S ribosomal protein S33, mitochondrial
+Macromolecule #26: 28S ribosomal protein S5, mitochondrial
+Macromolecule #27: 28S ribosomal protein S9, mitochondrial
+Macromolecule #28: 28S ribosomal protein S27, mitochondrial
+Macromolecule #29: Pentatricopeptide repeat domain-containing protein 3, mitochondrial
+Macromolecule #30: 12S rRNA N4-methylcytidine (m4C) methyltransferase
+Macromolecule #32: Putative ribosome-binding factor A, mitochondrial
+Macromolecule #31: 12S mitochondrial rRNA
+Macromolecule #33: POTASSIUM ION
+Macromolecule #34: ZINC ION
+Macromolecule #35: FE2/S2 (INORGANIC) CLUSTER
+Macromolecule #36: ADENOSINE-5'-TRIPHOSPHATE
+Macromolecule #37: GUANOSINE-5'-DIPHOSPHATE
+Macromolecule #38: MAGNESIUM ION
+Macromolecule #39: NICOTINAMIDE-ADENINE-DINUCLEOTIDE
+Macromolecule #40: SPERMINE
+Macromolecule #41: 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: 7.5 |
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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: GATAN K3 (6k x 4k) / Average electron dose: 45.0 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: 1.9000000000000001 µm / Nominal defocus min: 0.3 µm |
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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About Yorodumi



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

