[English] 日本語
Yorodumi- EMDB-51874: Assembly intermediate of human mitochondrial ribosome small subun... -
+
Open data
-
Basic information
| Entry | ![]() | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Title | Assembly intermediate of human mitochondrial ribosome small subunit in complex with NOA1, ERAL1, METTL17, MCAT and TFB1M (state N1) | |||||||||
Map data | ||||||||||
Sample |
| |||||||||
Keywords | mitochondria / small subunit / assembly / NOA1 / RIBOSOME | |||||||||
| Function / homology | Function and homology informationmitochondrial ribosome binding / rRNA modification in the mitochondrion / mitochondrial small ribosomal subunit assembly / mitochondrial transcription factor activity / transcription initiation at mitochondrial promoter / Mitochondrial Fatty Acid Beta-Oxidation / rRNA modification / rRNA (adenine-N6,N6-)-dimethyltransferase activity / [acyl-carrier-protein] S-malonyltransferase / [acyl-carrier-protein] S-malonyltransferase activity ...mitochondrial ribosome binding / rRNA modification in the mitochondrion / mitochondrial small ribosomal subunit assembly / mitochondrial transcription factor activity / transcription initiation at mitochondrial promoter / Mitochondrial Fatty Acid Beta-Oxidation / rRNA modification / rRNA (adenine-N6,N6-)-dimethyltransferase activity / [acyl-carrier-protein] S-malonyltransferase / [acyl-carrier-protein] S-malonyltransferase activity / RNA folding chaperone / mitochondrial ribosome assembly / Mitochondrial translation elongation / Mitochondrial translation initiation / Mitochondrial ribosome-associated quality control / S-adenosyl-L-methionine binding / Mitochondrial translation termination / rRNA methylation / mitochondrial ribosome / mitochondrial small ribosomal subunit / mitochondrial translation / fatty acid beta-oxidation / apoptotic mitochondrial changes / mitochondrial nucleoid / ribosomal small subunit binding / sperm head-tail coupling apparatus / Mitochondrial protein degradation / Transferases; Transferring one-carbon groups; Methyltransferases / mitochondrion organization / apoptotic signaling pathway / Transcriptional activation of mitochondrial biogenesis / fatty acid biosynthetic process / cell junction / regulation of translation / ribosomal small subunit assembly / 4 iron, 4 sulfur cluster binding / ribosomal small subunit biogenesis / 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 / apoptotic process / GTP binding / nucleolus / mitochondrion / DNA binding / RNA binding / nucleoplasm / metal ion binding / plasma membrane / cytoplasm / cytosol Similarity search - Function | |||||||||
| Biological species | Homo sapiens (human) | |||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 3.9 Å | |||||||||
Authors | Singh V / Shiriaev D / Khawaja A / Rorbach J | |||||||||
| Funding support | Sweden, 2 items
| |||||||||
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. | |||||||||
| History |
|
-
Structure visualization
| Supplemental images |
|---|
-
Downloads & links
-EMDB archive
| Header (meta data) | emd-51874-v30.xml emd-51874.xml | 61.1 KB 61.1 KB | Display Display | EMDB header |
|---|---|---|---|---|
| Images | emd_51874.png | 41.7 KB | ||
| Map data | emd_51874.map.gz | 14.6 MB | EMDB map data format | |
| Filedesc metadata | emd-51874.cif.gz | 13.9 KB | ||
| Others | emd_51874_additional_1.map.gz emd_51874_additional_2.map.gz emd_51874_half_map_1.map.gz emd_51874_half_map_2.map.gz | 411.4 MB 319.3 MB 764.1 MB 764.1 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-51874 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-51874 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 9h52MC ![]() 9h51C ![]() 9h54C ![]() 9h55C ![]() 9rorC ![]() 9rotC ![]() 9rovC ![]() 9rpfC M: atomic model generated by this map C: citing same article ( |
|---|---|
| Similar structure data | Similarity search - Function & homology F&H Search |
-
Links
| EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
|---|---|
| Related items in Molecule of the Month |
-
Map
-Supplemental data
-Additional map: #1
| File | emd_51874_additional_1.map | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Projections & Slices |
| ||||||||||||
| Density Histograms |
-Additional map: N1 composite unsharpened
| File | emd_51874_additional_2.map | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Annotation | N1 composite unsharpened | ||||||||||||
| Projections & Slices |
| ||||||||||||
| Density Histograms |
-Half map: #2
| File | emd_51874_half_map_1.map | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Projections & Slices |
| ||||||||||||
| Density Histograms |
-Half map: #1
| File | emd_51874_half_map_2.map | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Projections & Slices |
| ||||||||||||
| Density Histograms |
-
Sample components
+Entire : mitoribosomal small subunit assembly intermediate
+Supramolecule #1: mitoribosomal small subunit assembly intermediate
+Macromolecule #1: GTPase Era, mitochondrial
+Macromolecule #2: Small ribosomal subunit protein mS34
+Macromolecule #3: Nitric oxide-associated protein 1
+Macromolecule #4: 28S ribosomal protein S5, mitochondrial
+Macromolecule #5: 28S ribosomal protein S6, mitochondrial
+Macromolecule #6: 28S ribosomal protein S12, mitochondrial
+Macromolecule #7: 28S ribosomal protein S15, mitochondrial
+Macromolecule #8: 28S ribosomal protein S16, mitochondrial
+Macromolecule #9: 28S ribosomal protein S17, mitochondrial
+Macromolecule #10: 28S ribosomal protein S18b, mitochondrial
+Macromolecule #11: 28S ribosomal protein S18c, mitochondrial
+Macromolecule #12: MRPS21 isoform 1
+Macromolecule #13: 28S ribosomal protein S22, mitochondrial
+Macromolecule #14: 28S ribosomal protein S23, mitochondrial
+Macromolecule #15: 28S ribosomal protein S25, mitochondrial
+Macromolecule #16: 28S ribosomal protein S26, mitochondrial
+Macromolecule #18: 28S ribosomal protein S2, mitochondrial
+Macromolecule #19: 28S ribosomal protein S28, mitochondrial
+Macromolecule #20: 28S ribosomal protein S24, mitochondrial
+Macromolecule #21: 28S ribosomal protein S7, mitochondrial
+Macromolecule #22: 28S ribosomal protein S9, mitochondrial
+Macromolecule #23: 28S ribosomal protein S29, mitochondrial
+Macromolecule #24: 28S ribosomal protein S31, mitochondrial
+Macromolecule #25: 28S ribosomal protein S35, mitochondrial
+Macromolecule #26: Pentatricopeptide repeat domain-containing protein 3, mitochondrial
+Macromolecule #27: Malonyl-CoA-acyl carrier protein transacylase, mitochondrial
+Macromolecule #28: Isoform 2 of Ribosome assembly protein METTL17, mitochondrial
+Macromolecule #29: Dimethyladenosine transferase 1, mitochondrial
+Macromolecule #30: 28S ribosomal protein S27, mitochondrial
+Macromolecule #17: 12S mitochondrial rRNA
+Macromolecule #31: GUANOSINE-5'-DIPHOSPHATE
+Macromolecule #32: ZINC ION
+Macromolecule #33: FE2/S2 (INORGANIC) CLUSTER
+Macromolecule #34: MAGNESIUM ION
+Macromolecule #35: ADENOSINE-5'-TRIPHOSPHATE
+Macromolecule #36: IRON/SULFUR CLUSTER
-Experimental details
-Structure determination
| Method | cryo EM |
|---|---|
Processing | single particle reconstruction |
| Aggregation state | particle |
-
Sample preparation
| Buffer | pH: 7.5 |
|---|---|
| Vitrification | Cryogen name: ETHANE |
-
Electron microscopy
| Microscope | TFS KRIOS |
|---|---|
| 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: 1.8 µm / Nominal defocus min: 0.4 µm |
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
Movie
Controller
About Yorodumi



Keywords
Homo sapiens (human)
Authors
Sweden, 2 items
Citation























Z (Sec.)
Y (Row.)
X (Col.)

























































Processing
FIELD EMISSION GUN

