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- EMDB-25750: Structure of the peroxisomal retro-translocon formed by a heterot... -
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Basic information
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Title | Structure of the peroxisomal retro-translocon formed by a heterotrimeric ubiquitin ligase complex | |||||||||
![]() | Structure of the peroxisomal retro-translocon formed by a heterotrimeric ubiquitin ligase complex | |||||||||
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![]() | peroxisome / retro-translocon / ubiquitin ligase / TRANSLOCASE | |||||||||
Function / homology | ![]() : / protein import into peroxisome matrix / : / peroxisome / zinc ion binding / metal ion binding Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.1 Å | |||||||||
![]() | Peiqiang F / Tom R | |||||||||
Funding support | ![]()
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![]() | ![]() Title: A peroxisomal ubiquitin ligase complex forms a retrotranslocation channel. Authors: Peiqiang Feng / Xudong Wu / Satchal K Erramilli / Joao A Paulo / Pawel Knejski / Steven P Gygi / Anthony A Kossiakoff / Tom A Rapoport / ![]() Abstract: Peroxisomes are ubiquitous organelles that house various metabolic reactions and are essential for human health. Luminal peroxisomal proteins are imported from the cytosol by mobile receptors, which ...Peroxisomes are ubiquitous organelles that house various metabolic reactions and are essential for human health. Luminal peroxisomal proteins are imported from the cytosol by mobile receptors, which then recycle back to the cytosol by a poorly understood process. Recycling requires receptor modification by a membrane-embedded ubiquitin ligase complex comprising three RING finger domain-containing proteins (Pex2, Pex10 and Pex12). Here we report a cryo-electron microscopy structure of the ligase complex, which together with biochemical and in vivo experiments reveals its function as a retrotranslocation channel for peroxisomal import receptors. Each subunit of the complex contributes five transmembrane segments that co-assemble into an open channel. The three ring finger domains form a cytosolic tower, with ring finger 2 (RF2) positioned above the channel pore. We propose that the N terminus of a recycling receptor is inserted from the peroxisomal lumen into the pore and monoubiquitylated by RF2 to enable extraction into the cytosol. If recycling is compromised, receptors are polyubiquitylated by the concerted action of RF10 and RF12 and degraded. This polyubiquitylation pathway also maintains the homeostasis of other peroxisomal import factors. Our results clarify a crucial step during peroxisomal protein import and reveal why mutations in the ligase complex cause human disease. | |||||||||
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 62.8 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 17.4 KB 17.4 KB | Display Display | ![]() |
Images | ![]() | 55.8 KB | ||
Filedesc metadata | ![]() | 6.5 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7t92MC ![]() 7t9xC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | Structure of the peroxisomal retro-translocon formed by a heterotrimeric ubiquitin ligase complex | ||||||||||||||||||||
Voxel size | X=Y=Z: 1.06 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
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Sample components
+Entire : Peroxisomal heterotrimeric ubiquitin ligase complex bound with Fab
+Supramolecule #1: Peroxisomal heterotrimeric ubiquitin ligase complex bound with Fab
+Supramolecule #2: Peroxin12, Peroxin2, Peroxin10
+Supramolecule #3: Fab heavy chain, Fab light chain
+Macromolecule #1: Peroxin-12
+Macromolecule #2: Peroxin-2
+Macromolecule #3: Peroxin-10
+Macromolecule #4: Fab heavy chain
+Macromolecule #5: Fab light chain
+Macromolecule #6: ZINC ION
+Macromolecule #7: 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine
+Macromolecule #8: CHOLESTEROL
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.4 |
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Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 4 K / Instrument: FEI VITROBOT MARK I |
Details | This sample was monodisperse. |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Average electron dose: 52.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: INSILICO MODEL |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 121644 |
Initial angle assignment | Type: ANGULAR RECONSTITUTION |
Final angle assignment | Type: ANGULAR RECONSTITUTION |