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Open data
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Basic information
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| Title | Nub1/Fat10-processing human 26S proteasome | |||||||||
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Keywords | 26S Proteasome / Nub1 / Fat10 / MOTOR PROTEIN / HYDROLASE-PROTEIN BINDING complex | |||||||||
| Function / homology | Function and homology informationregulation of ubiquitin-dependent protein catabolic process / positive regulation of inclusion body assembly / thyrotropin-releasing hormone receptor binding / nuclear proteasome complex / host-mediated perturbation of viral transcription / Impaired BRCA2 translocation to the nucleus / Impaired BRCA2 binding to SEM1 (DSS1) / proteasome accessory complex / purine ribonucleoside triphosphate binding / integrator complex ...regulation of ubiquitin-dependent protein catabolic process / positive regulation of inclusion body assembly / thyrotropin-releasing hormone receptor binding / nuclear proteasome complex / host-mediated perturbation of viral transcription / Impaired BRCA2 translocation to the nucleus / Impaired BRCA2 binding to SEM1 (DSS1) / proteasome accessory complex / purine ribonucleoside triphosphate binding / integrator complex / proteasome regulatory particle / CD8-positive, alpha-beta T cell differentiation / thymic T cell selection / cytosolic proteasome complex / CD8-positive, alpha-beta T cell homeostasis / positive regulation of proteasomal protein catabolic process / proteasome-activating activity / Antigen processing: Ub, ATP-independent proteasomal degradation / proteasome regulatory particle, lid subcomplex / proteasome regulatory particle, base subcomplex / negative regulation of programmed cell death / T-helper 1 cell differentiation / negative regulation of regulatory T cell differentiation / protein K63-linked deubiquitination / metal-dependent deubiquitinase activity / cellular response to type I interferon / Regulation of ornithine decarboxylase (ODC) / proteasome core complex / Proteasome assembly / T-helper 17 cell differentiation / retrograde vesicle-mediated transport, Golgi to endoplasmic reticulum / Cross-presentation of soluble exogenous antigens (endosomes) / transcription factor binding / Somitogenesis / flagellated sperm motility / K63-linked deubiquitinase activity / Homologous DNA Pairing and Strand Exchange / Defective homologous recombination repair (HRR) due to BRCA1 loss of function / Defective HDR through Homologous Recombination Repair (HRR) due to PALB2 loss of BRCA1 binding function / Defective HDR through Homologous Recombination Repair (HRR) due to PALB2 loss of BRCA2/RAD51/RAD51C binding function / Resolution of D-loop Structures through Synthesis-Dependent Strand Annealing (SDSA) / Lewy body / Resolution of D-loop Structures through Holliday Junction Intermediates / proteasome binding / Impaired BRCA2 binding to RAD51 / myofibril / response to tumor necrosis factor / positive regulation of RNA polymerase II transcription preinitiation complex assembly / proteasomal ubiquitin-independent protein catabolic process / general transcription initiation factor binding / Presynaptic phase of homologous DNA pairing and strand exchange / proteasome storage granule / protein deubiquitination / AMPK-induced ERAD and lysosome mediated degradation of PD-L1(CD274) / polyubiquitin modification-dependent protein binding / proteasome endopeptidase complex / NF-kappaB binding / proteasome core complex, beta-subunit complex / endopeptidase activator activity / threonine-type endopeptidase activity / proteasome core complex, alpha-subunit complex / proteasome assembly / mRNA export from nucleus / GSK3B-mediated proteasomal degradation of PD-L1(CD274) / SARS-CoV-1 targets host intracellular signalling and regulatory pathways / SPOP-mediated proteasomal degradation of PD-L1(CD274) / regulation of G1/S transition of mitotic cell cycle / immune system process / enzyme regulator activity / regulation of macroautophagy / positive regulation of interleukin-2 production / ERAD pathway / ciliary tip / Ribosome Quality Control (RQC) complex extracts and degrades nascent peptide / response to type II interferon / inclusion body / TBP-class protein binding / stem cell differentiation / proteasome complex / : / regulation of proteasomal protein catabolic process / sarcomere / sperm end piece / Regulation of activated PAK-2p34 by proteasome mediated degradation / ubiquitin binding / proteasomal protein catabolic process / Autodegradation of Cdh1 by Cdh1:APC/C / negative regulation of inflammatory response to antigenic stimulus / APC/C:Cdc20 mediated degradation of Securin / N-glycan trimming in the ER and Calnexin/Calreticulin cycle / Asymmetric localization of PCP proteins / Ubiquitin-dependent degradation of Cyclin D / lipopolysaccharide binding / SCF-beta-TrCP mediated degradation of Emi1 / NIK-->noncanonical NF-kB signaling / AUF1 (hnRNP D0) binds and destabilizes mRNA / TNFR2 non-canonical NF-kB pathway / Assembly of the pre-replicative complex / Vpu mediated degradation of CD4 / P-body Similarity search - Function | |||||||||
| Biological species | Homo sapiens (human) | |||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 3.1 Å | |||||||||
Authors | Arkinson C / Gee CL / Martin A | |||||||||
| Funding support | United States, 1 items
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Citation | Journal: Nat Struct Mol Biol / Year: 2025Title: NUB1 traps unfolded FAT10 for ubiquitin-independent degradation by the 26S proteasome. Authors: Connor Arkinson / Ken C Dong / Christine L Gee / Shawn M Costello / Aimee Chi Soe / Greg L Hura / Susan Marqusee / Andreas Martin / ![]() Abstract: The ubiquitin-like modifier FAT10 targets hundreds of proteins in the mammalian immune system to the 26S proteasome for degradation. This degradation pathway requires the cofactor NUB1, yet the ...The ubiquitin-like modifier FAT10 targets hundreds of proteins in the mammalian immune system to the 26S proteasome for degradation. This degradation pathway requires the cofactor NUB1, yet the underlying mechanisms remain unknown. Here, we reconstituted a minimal in vitro system with human components and revealed that NUB1 uses the intrinsic instability of FAT10 to trap its N-terminal ubiquitin-like domain in an unfolded state and deliver it to the 26S proteasome for engagement, allowing the degradation of FAT10-ylated substrates in a ubiquitin-independent and p97-independent manner. Using hydrogen-deuterium exchange, structural modeling and site-directed mutagenesis, we identified the formation of an intricate complex with FAT10 that activates NUB1 for docking to the 26S proteasome, and our cryo-EM studies visualized the highly dynamic NUB1 complex bound to the proteasomal Rpn1 subunit during FAT10 delivery and the early stages of ATP-dependent degradation. These findings identified a previously unknown mode of cofactor-mediated, ubiquitin-independent substrate delivery to the 26S proteasome that relies on trapping partially unfolded states for engagement by the proteasomal ATPase motor. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_42507.map.gz | 42.4 MB | EMDB map data format | |
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| Header (meta data) | emd-42507-v30.xml emd-42507.xml | 53.2 KB 53.2 KB | Display Display | EMDB header |
| FSC (resolution estimation) | emd_42507_fsc.xml | 9.2 KB | Display | FSC data file |
| Images | emd_42507.png | 100.9 KB | ||
| Filedesc metadata | emd-42507.cif.gz | 14.5 KB | ||
| Others | emd_42507_half_map_1.map.gz emd_42507_half_map_2.map.gz | 77.6 MB 77.6 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-42507 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-42507 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 8uscMC ![]() 8usbC ![]() 8usdC 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_42507.map.gz / Format: CCP4 / Size: 83.7 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: 1.048 Å | ||||||||||||||||||||||||||||||||||||
| Density |
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
-Half map: #2
| File | emd_42507_half_map_1.map | ||||||||||||
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| Density Histograms |
-Half map: #1
| File | emd_42507_half_map_2.map | ||||||||||||
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| Density Histograms |
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Sample components
+Entire : Human 26S proteasome complexed with Nub1 and Fat 10
+Supramolecule #1: Human 26S proteasome complexed with Nub1 and Fat 10
+Macromolecule #1: Proteasome subunit alpha type-2
+Macromolecule #2: 26S proteasome non-ATPase regulatory subunit 6
+Macromolecule #3: 26S proteasome non-ATPase regulatory subunit 2
+Macromolecule #4: 26S proteasome non-ATPase regulatory subunit 11
+Macromolecule #5: 26S proteasome non-ATPase regulatory subunit 1
+Macromolecule #6: 26S proteasome non-ATPase regulatory subunit 7
+Macromolecule #7: 26S proteasome non-ATPase regulatory subunit 13
+Macromolecule #8: 26S proteasome non-ATPase regulatory subunit 4
+Macromolecule #9: 26S proteasome regulatory subunit 7
+Macromolecule #10: 26S proteasome regulatory subunit 4
+Macromolecule #11: 26S protease regulatory subunit 8
+Macromolecule #12: 26S proteasome regulatory subunit 6B
+Macromolecule #13: 26S protease regulatory subunit 10B
+Macromolecule #14: 26S proteasome regulatory subunit 6A
+Macromolecule #15: substrate peptide
+Macromolecule #16: Proteasome subunit alpha type-6
+Macromolecule #17: Proteasome subunit alpha type-4
+Macromolecule #18: Proteasome subunit alpha type-7
+Macromolecule #19: Proteasome subunit alpha type-5
+Macromolecule #20: Proteasome subunit alpha type-1
+Macromolecule #21: Proteasome subunit alpha type-3
+Macromolecule #22: Proteasome subunit beta type-7
+Macromolecule #23: 26S proteasome complex subunit SEM1
+Macromolecule #24: 26S proteasome non-ATPase regulatory subunit 8
+Macromolecule #25: 26S proteasome non-ATPase regulatory subunit 12
+Macromolecule #26: Isoform 2 of NEDD8 ultimate buster 1
+Macromolecule #27: 26S proteasome non-ATPase regulatory subunit 3
+Macromolecule #28: 26S proteasome non-ATPase regulatory subunit 14
+Macromolecule #29: MAGNESIUM ION
+Macromolecule #30: ADENOSINE-5'-TRIPHOSPHATE
+Macromolecule #31: ADENOSINE-5'-DIPHOSPHATE
+Macromolecule #32: 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: 7.4 Details: 30 mM HEPES pH7.4, 25 mM NaCl, 25 mM KCl, 3% (v/v) glycerol, 5 mM MgCl2 2 mM ATP and 0.5 mM TCEP |
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| Grid | Model: UltrAuFoil R2/2 / Material: GOLD / Mesh: 500 / Support film - Material: GOLD / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 25 sec. / Details: 25 mA |
| Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 298 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
| Microscope | FEI TITAN KRIOS |
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| Image recording | Film or detector model: GATAN K3 (6k 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: 1.7 µm / Nominal defocus min: 0.5 µm |
| 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
United States, 1 items
Citation

















Z (Sec.)
Y (Row.)
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Processing
FIELD EMISSION GUN

