+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-1853 | |||||||||
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Title | Cryo-EM map of the SMG-1-9 complex. | |||||||||
Map data | This is the cryo-EM map of the SMG-1-9 complex | |||||||||
Sample |
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Keywords | Nonsense-mediated mRNA decay / NMD / SMG-1 / SMG-8 / SMG-9 / SMG1C | |||||||||
Function / homology | nuclear-transcribed mRNA catabolic process, nonsense-mediated decay Function and homology information | |||||||||
Biological species | Homo sapiens (human) | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 30.0 Å | |||||||||
Authors | Arias-Palomo E / Yamashita A / Fernandez IS / Nunez-Ramirez R / Bamba Y / Izumi N / Ohno S / Llorca O | |||||||||
Citation | Journal: Genes Dev / Year: 2011 Title: The nonsense-mediated mRNA decay SMG-1 kinase is regulated by large-scale conformational changes controlled by SMG-8. Authors: Ernesto Arias-Palomo / Akio Yamashita / Israel S Fernández / Rafael Núñez-Ramírez / Yumi Bamba / Natsuko Izumi / Shigeo Ohno / Oscar Llorca / Abstract: Nonsense-mediated mRNA decay (NMD) is a eukaryotic surveillance pathway that regulates the degradation of mRNAs harboring premature translation termination codons. NMD also influences the expression ...Nonsense-mediated mRNA decay (NMD) is a eukaryotic surveillance pathway that regulates the degradation of mRNAs harboring premature translation termination codons. NMD also influences the expression of many physiological transcripts. SMG-1 is a large kinase essential to NMD that phosphorylates Upf1, which seems to be the definitive signal triggering mRNA decay. However, the regulation of the kinase activity of SMG-1 remains poorly understood. Here, we reveal the three-dimensional architecture of SMG-1 in complex with SMG-8 and SMG-9, and the structural mechanisms regulating SMG-1 kinase. A bent arm comprising a long region of HEAT (huntington, elongation factor 3, a subunit of PP2A and TOR1) repeats at the N terminus of SMG-1 functions as a scaffold for SMG-8 and SMG-9, and projects from the C-terminal core containing the phosphatidylinositol 3-kinase domain. SMG-9 seems to control the activity of SMG-1 indirectly through the recruitment of SMG-8 to the N-terminal HEAT repeat region of SMG-1. Notably, SMG-8 binding to the SMG-1:SMG-9 complex specifically down-regulates the kinase activity of SMG-1 on Upf1 without contacting the catalytic domain. Assembly of the SMG-1:SMG-8:SMG-9 complex induces a significant motion of the HEAT repeats that is signaled to the kinase domain. Thus, large-scale conformational changes induced by SMG-8 after SMG-9-mediated recruitment tune SMG-1 kinase activity to modulate NMD. | |||||||||
History |
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-Structure visualization
Movie |
Movie viewer |
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Structure viewer | EM map: SurfViewMolmilJmol/JSmol |
Supplemental images |
-Downloads & links
-EMDB archive
Map data | emd_1853.map.gz | 162.2 KB | EMDB map data format | |
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Header (meta data) | emd-1853-v30.xml emd-1853.xml | 10.4 KB 10.4 KB | Display Display | EMDB header |
Images | EMD1853.png | 42 KB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-1853 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-1853 | HTTPS FTP |
-Validation report
Summary document | emd_1853_validation.pdf.gz | 190.8 KB | Display | EMDB validaton report |
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Full document | emd_1853_full_validation.pdf.gz | 189.9 KB | Display | |
Data in XML | emd_1853_validation.xml.gz | 4.6 KB | Display | |
Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-1853 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-1853 | HTTPS FTP |
-Related structure data
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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-Map
File | Download / File: emd_1853.map.gz / Format: CCP4 / Size: 1.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | This is the cryo-EM map of the SMG-1-9 complex | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 4.2 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Sample components
-Entire : Human SMG-1 kinase bound to SMG-9
Entire | Name: Human SMG-1 kinase bound to SMG-9 |
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Components |
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-Supramolecule #1000: Human SMG-1 kinase bound to SMG-9
Supramolecule | Name: Human SMG-1 kinase bound to SMG-9 / type: sample / ID: 1000 Oligomeric state: One molecule of SMG-1 binds to one molecule of SMG-9 Number unique components: 2 |
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Molecular weight | Theoretical: 470 KDa |
-Macromolecule #1: SMG-1
Macromolecule | Name: SMG-1 / type: protein_or_peptide / ID: 1 / Name.synonym: SMG-1 / Number of copies: 1 / Oligomeric state: Monomer / Recombinant expression: Yes |
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Source (natural) | Organism: Homo sapiens (human) / synonym: Human |
Molecular weight | Theoretical: 410 KDa |
Recombinant expression | Organism: 293T cells / Recombinant plasmid: pEF_Flag-HA-SBP |
Sequence | GO: nuclear-transcribed mRNA catabolic process, nonsense-mediated decay |
-Macromolecule #2: SMG-9
Macromolecule | Name: SMG-9 / type: protein_or_peptide / ID: 2 / Name.synonym: SMG-9 / Number of copies: 1 / Oligomeric state: Monomer / Recombinant expression: Yes |
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Source (natural) | Organism: Homo sapiens (human) / synonym: Human |
Molecular weight | Theoretical: 60 KDa |
Recombinant expression | Organism: 293T Cells / Recombinant plasmid: pSR_Strep-HA |
Sequence | GO: nuclear-transcribed mRNA catabolic process, nonsense-mediated decay |
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | single particle reconstruction |
Aggregation state | particle |
-Sample preparation
Buffer | pH: 7.5 / Details: 10 mM HEPES-KOH at pH7.5, 150 mM NaCl, 10 mM MgCl2 |
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Grid | Details: QUANTIFOIL R 1.2/1.3 with an thin carbon layer on top |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 90 K / Instrument: OTHER / Details: Vitrification instrument: Vitrobot (FEI) / Method: Blot for 1.5 seconds |
-Electron microscopy
Microscope | JEOL 2200FS |
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Temperature | Average: 90 K |
Alignment procedure | Legacy - Astigmatism: Objective lens astigmatism was corrected at 80,000 times magnification |
Specialist optics | Energy filter - Name: Omega |
Image recording | Category: FILM / Film or detector model: KODAK SO-163 FILM / Digitization - Scanner: OTHER / Digitization - Sampling interval: 10.5 µm / Details: Minolta Dimage Scan Multi PRO scanner / Bits/pixel: 16 |
Electron beam | Acceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.0 mm / Nominal defocus max: 6.0 µm / Nominal defocus min: 2.0 µm / Nominal magnification: 50000 |
Sample stage | Specimen holder: Side entry liquid nitrogen-cooled cryo specimen holder Specimen holder model: GATAN LIQUID NITROGEN |
-Image processing
Details | Particles were collected manually. |
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CTF correction | Details: Each micrograph |
Final reconstruction | Applied symmetry - Point group: C1 (asymmetric) / Algorithm: OTHER / Resolution.type: BY AUTHOR / Resolution: 30.0 Å / Resolution method: FSC 0.5 CUT-OFF / Software - Name: EMAN, Xmipp / Number images used: 15500 |