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Yorodumi- EMDB-14114: Structure of the human 48S initiation complex in closed state (h4... -
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Basic information
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| Title | Structure of the human 48S initiation complex in closed state (h48S AUG closed) | |||||||||
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Keywords | 48S / initiation / eIF3 / ternary complex / translation / open state / RIBOSOME | |||||||||
| Function / homology | Function and homology informationtranslation initiation ternary complex / regulation of translation in response to endoplasmic reticulum stress / glial limiting end-foot / HRI-mediated signaling / response to manganese-induced endoplasmic reticulum stress / viral translational termination-reinitiation / Cellular response to mitochondrial stress / positive regulation of type B pancreatic cell apoptotic process / Response of EIF2AK1 (HRI) to heme deficiency / Recycling of eIF2:GDP ...translation initiation ternary complex / regulation of translation in response to endoplasmic reticulum stress / glial limiting end-foot / HRI-mediated signaling / response to manganese-induced endoplasmic reticulum stress / viral translational termination-reinitiation / Cellular response to mitochondrial stress / positive regulation of type B pancreatic cell apoptotic process / Response of EIF2AK1 (HRI) to heme deficiency / Recycling of eIF2:GDP / methionyl-initiator methionine tRNA binding / negative regulation of translational initiation in response to stress / eukaryotic translation initiation factor 3 complex, eIF3e / cap-dependent translational initiation / PERK-mediated unfolded protein response / eukaryotic translation initiation factor 3 complex, eIF3m / PERK regulates gene expression / response to kainic acid / IRES-dependent viral translational initiation / translation reinitiation / eukaryotic translation initiation factor 2 complex / formation of cytoplasmic translation initiation complex / multi-eIF complex / regulation of translational initiation in response to stress / eukaryotic translation initiation factor 3 complex / eukaryotic 43S preinitiation complex / translation factor activity, RNA binding / mRNA cap binding / formation of translation preinitiation complex / eukaryotic 48S preinitiation complex / negative regulation of endoplasmic reticulum unfolded protein response / oxidized pyrimidine DNA binding / response to TNF agonist / positive regulation of base-excision repair / positive regulation of ubiquitin-protein transferase activity / regulation of translational initiation / positive regulation of respiratory burst involved in inflammatory response / positive regulation of gastrulation / protein-synthesizing GTPase / protein tyrosine kinase inhibitor activity / positive regulation of DNA-templated transcription initiation / positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage / IRE1-RACK1-PP2A complex / positive regulation of Golgi to plasma membrane protein transport / nuclear-transcribed mRNA catabolic process, nonsense-mediated decay / nucleolus organization / TNFR1-mediated ceramide production / negative regulation of RNA splicing / neural crest cell differentiation / metal-dependent deubiquitinase activity / supercoiled DNA binding / cytoplasmic translational initiation / NF-kappaB complex / negative regulation of DNA repair / oxidized purine DNA binding / cysteine-type endopeptidase activator activity involved in apoptotic process / rRNA modification in the nucleus and cytosol / negative regulation of intrinsic apoptotic signaling pathway in response to hydrogen peroxide / negative regulation of bicellular tight junction assembly / ubiquitin-like protein conjugating enzyme binding / regulation of establishment of cell polarity / negative regulation of phagocytosis / erythrocyte homeostasis / cytoplasmic side of rough endoplasmic reticulum membrane / Formation of the ternary complex, and subsequently, the 43S complex / ion channel inhibitor activity / protein kinase A binding / laminin receptor activity / Ribosomal scanning and start codon recognition / pigmentation / positive regulation of mitochondrial depolarization / Translation initiation complex formation / negative regulation of Wnt signaling pathway / fibroblast growth factor binding / Protein hydroxylation / monocyte chemotaxis / BH3 domain binding / negative regulation of translational frameshifting / regulation of adenylate cyclase-activating G protein-coupled receptor signaling pathway / SARS-CoV-1 modulates host translation machinery / positive regulation of GTPase activity / mTORC1-mediated signalling / TOR signaling / iron-sulfur cluster binding / Peptide chain elongation / regulation of cell division / cellular response to ethanol / Selenocysteine synthesis / Formation of a pool of free 40S subunits / positive regulation of intrinsic apoptotic signaling pathway by p53 class mediator / negative regulation of protein binding / Eukaryotic Translation Termination / protein serine/threonine kinase inhibitor activity / SRP-dependent cotranslational protein targeting to membrane / Response of EIF2AK4 (GCN2) to amino acid deficiency / ubiquitin ligase inhibitor activity / negative regulation of respiratory burst involved in inflammatory response / Viral mRNA Translation / endonucleolytic cleavage to generate mature 3'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) Similarity search - Function | |||||||||
| Biological species | Homo sapiens (human) | |||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 3.7 Å | |||||||||
Authors | Yi S-H / Petrychenko V / Schliep JE / Goyal A / Linden A / Chari A / Urlaub H / Stark H / Rodnina MV / Adio S / Fischer N | |||||||||
| Funding support | Germany, 2 items
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Citation | Journal: Nucleic Acids Res / Year: 2022Title: Conformational rearrangements upon start codon recognition in human 48S translation initiation complex. Authors: Sung-Hui Yi / Valentyn Petrychenko / Jan Erik Schliep / Akanksha Goyal / Andreas Linden / Ashwin Chari / Henning Urlaub / Holger Stark / Marina V Rodnina / Sarah Adio / Niels Fischer / ![]() Abstract: Selection of the translation start codon is a key step during protein synthesis in human cells. We obtained cryo-EM structures of human 48S initiation complexes and characterized the intermediates of ...Selection of the translation start codon is a key step during protein synthesis in human cells. We obtained cryo-EM structures of human 48S initiation complexes and characterized the intermediates of codon recognition by kinetic methods using eIF1A as a reporter. Both approaches capture two distinct ribosome populations formed on an mRNA with a cognate AUG codon in the presence of eIF1, eIF1A, eIF2-GTP-Met-tRNAiMet and eIF3. The 'open' 40S subunit conformation differs from the human 48S scanning complex and represents an intermediate preceding the codon recognition step. The 'closed' form is similar to reported structures of complexes from yeast and mammals formed upon codon recognition, except for the orientation of eIF1A, which is unique in our structure. Kinetic experiments show how various initiation factors mediate the population distribution of open and closed conformations until 60S subunit docking. Our results provide insights into the timing and structure of human translation initiation intermediates and suggest the differences in the mechanisms of start codon selection between mammals and yeast. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_14114.map.gz | 159.6 MB | EMDB map data format | |
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| Header (meta data) | emd-14114-v30.xml emd-14114.xml | 74.9 KB 74.9 KB | Display Display | EMDB header |
| FSC (resolution estimation) | emd_14114_fsc.xml | 12.8 KB | Display | FSC data file |
| Images | emd_14114.png | 115.2 KB | ||
| Masks | emd_14114_msk_1.map | 178 MB | Mask map | |
| Filedesc metadata | emd-14114.cif.gz | 18 KB | ||
| Others | emd_14114_half_map_1.map.gz emd_14114_half_map_2.map.gz | 140.4 MB 140.4 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-14114 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-14114 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 7qp7MC ![]() 7qp6C 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 |
| EM raw data | EMPIAR-11005 (Title: Conformational rearrangements upon start codon recognition in human 48S translation initiation complexData size: 1.1 TB Data #1: Motion-corrected, dose-weighted micrographs [micrographs - single frame] Data #2: Particles of human 48S IC in open state ("open") [picked particles - single frame - processed] Data #3: Particles of human 48S IC in closed state ("closed") [picked particles - single frame - processed]) |
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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_14114.map.gz / Format: CCP4 / Size: 178 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
-Mask #1
| File | emd_14114_msk_1.map | ||||||||||||
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-Half map: #2
| File | emd_14114_half_map_1.map | ||||||||||||
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| Density Histograms |
-Half map: #1
| File | emd_14114_half_map_2.map | ||||||||||||
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| Density Histograms |
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Sample components
+Entire : Human 48S initiation complex 40S-eIF1-eIF1A-eIF2-eIF3-tRNA-Met-mRNA
+Supramolecule #1: Human 48S initiation complex 40S-eIF1-eIF1A-eIF2-eIF3-tRNA-Met-mRNA
+Macromolecule #1: Eukaryotic translation initiation factor 3 subunit B
+Macromolecule #2: Eukaryotic translation initiation factor 3 subunit K
+Macromolecule #3: Eukaryotic translation initiation factor 3 subunit F
+Macromolecule #4: Eukaryotic translation initiation factor 3 subunit L
+Macromolecule #5: Eukaryotic translation initiation factor 3 subunit M
+Macromolecule #7: Eukaryotic translation initiation factor 3 subunit H
+Macromolecule #8: 60S ribosomal protein L41
+Macromolecule #10: 40S ribosomal protein S11
+Macromolecule #11: 40S ribosomal protein S4, X isoform
+Macromolecule #12: 40S ribosomal protein S9
+Macromolecule #13: 40S ribosomal protein S23
+Macromolecule #14: 40S ribosomal protein S30
+Macromolecule #15: 40S ribosomal protein S7
+Macromolecule #16: 40S ribosomal protein S27
+Macromolecule #17: 40S ribosomal protein S13
+Macromolecule #18: 40S ribosomal protein S15a
+Macromolecule #19: 40S ribosomal protein S21
+Macromolecule #20: 40S ribosomal protein S2
+Macromolecule #21: 40S ribosomal protein S17
+Macromolecule #22: 40S ribosomal protein SA
+Macromolecule #23: 40S ribosomal protein S3a
+Macromolecule #24: 40S ribosomal protein S14
+Macromolecule #25: 40S ribosomal protein S26
+Macromolecule #26: 40S ribosomal protein S8
+Macromolecule #27: 40S ribosomal protein S6
+Macromolecule #28: 40S ribosomal protein S24
+Macromolecule #29: 40S ribosomal protein S5
+Macromolecule #30: 40S ribosomal protein S16
+Macromolecule #31: 40S ribosomal protein S3
+Macromolecule #32: 40S ribosomal protein S10
+Macromolecule #33: 40S ribosomal protein S15
+Macromolecule #34: Receptor of activated protein C kinase 1
+Macromolecule #35: 40S ribosomal protein S19
+Macromolecule #36: 40S ribosomal protein S25
+Macromolecule #37: 40S ribosomal protein S18
+Macromolecule #38: 40S ribosomal protein S20
+Macromolecule #39: 40S ribosomal protein S29
+Macromolecule #40: Ubiquitin-40S ribosomal protein S27a
+Macromolecule #41: 40S ribosomal protein S12
+Macromolecule #42: 40S ribosomal protein S28
+Macromolecule #43: Eukaryotic translation initiation factor 3 subunit G
+Macromolecule #44: Eukaryotic translation initiation factor 1A, X-chromosomal
+Macromolecule #45: Eukaryotic translation initiation factor 2 subunit 1
+Macromolecule #46: Eukaryotic translation initiation factor 2 subunit 3
+Macromolecule #47: Eukaryotic translation initiation factor 3 subunit A
+Macromolecule #48: Eukaryotic translation initiation factor 3 subunit E
+Macromolecule #50: Eukaryotic translation initiation factor 3 subunit D
+Macromolecule #51: Eukaryotic translation initiation factor 3 subunit C
+Macromolecule #6: mRNA
+Macromolecule #9: 18S rRNA
+Macromolecule #49: Initiator Met-tRNA-i
+Macromolecule #52: ZINC ION
-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 Details: 20 mM Hepes, pH 7.5, 95 mM KOAc, 3.75 mM Mg(OAc)2, 1 mM ATP, 0.5 mM GTP, 0.25 mM spermidine, 2 mM DTT, 0.4 U/uL RiboLock RNase inhibitor |
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| Grid | Model: Quantifoil R3.5/1 / Material: COPPER / Support film - Material: CARBON / Support film - topology: CONTINUOUS |
| Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV Details: Cryo-EM grids were prepared by floating home-made continuous carbon on 40 ul sample in the wells of teflon block (custom-made). The sample-covered carbon was then adsorbed to an EM grid.. |
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Electron microscopy
| Microscope | FEI TITAN KRIOS |
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| Details | Aberration corrections performed using Cs image corrector (CEOS company) |
| Image recording | Film or detector model: FEI FALCON III (4k x 4k) / Detector mode: INTEGRATING / Digitization - Dimensions - Width: 4096 pixel / Digitization - Dimensions - Height: 4096 pixel / Number grids imaged: 1 / Number real images: 15544 / Average exposure time: 1.0 sec. / 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 / Cs: 0.01 mm / Nominal defocus max: 4.0 µm / Nominal defocus min: 1.5 µm / Nominal magnification: 59000 |
| Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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About Yorodumi



Keywords
Homo sapiens (human)
Authors
Germany, 2 items
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Processing
FIELD EMISSION GUN



