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Open data
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Basic information
Entry | Database: PDB / ID: 6vcd | ||||||
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Title | Cryo-EM structure of IRP2-FBXL5-SKP1 complex | ||||||
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![]() | LIGASE / E3 ligase / [2Fe-2S] cluster / Iron metabolism | ||||||
Function / homology | ![]() aconitate hydratase activity / iron-responsive element binding / : / F-box domain binding / citrate metabolic process / PcG protein complex / protoporphyrinogen IX biosynthetic process / Cul7-RING ubiquitin ligase complex / positive regulation of ubiquitin protein ligase activity / Loss of Function of FBXW7 in Cancer and NOTCH1 Signaling ...aconitate hydratase activity / iron-responsive element binding / : / F-box domain binding / citrate metabolic process / PcG protein complex / protoporphyrinogen IX biosynthetic process / Cul7-RING ubiquitin ligase complex / positive regulation of ubiquitin protein ligase activity / Loss of Function of FBXW7 in Cancer and NOTCH1 Signaling / maintenance of protein location in nucleus / intestinal absorption / erythrocyte homeostasis / SCF ubiquitin ligase complex / ubiquitin ligase complex scaffold activity / SCF-dependent proteasomal ubiquitin-dependent protein catabolic process / Prolactin receptor signaling / protein monoubiquitination / Association of TriC/CCT with target proteins during biosynthesis / cullin family protein binding / ubiquitin-like ligase-substrate adaptor activity / protein K48-linked ubiquitination / Nuclear events stimulated by ALK signaling in cancer / ubiquitin ligase complex / translation repressor activity / tricarboxylic acid cycle / Regulation of BACH1 activity / MAP3K8 (TPL2)-dependent MAPK1/3 activation / osteoclast differentiation / post-embryonic development / molecular function activator activity / SCF-beta-TrCP mediated degradation of Emi1 / NIK-->noncanonical NF-kB signaling / Vpu mediated degradation of CD4 / Dectin-1 mediated noncanonical NF-kB signaling / Degradation of GLI1 by the proteasome / Activation of NF-kappaB in B cells / Negative regulation of NOTCH4 signaling / Iron uptake and transport / GSK3B and BTRC:CUL1-mediated-degradation of NFE2L2 / Degradation of GLI2 by the proteasome / GLI3 is processed to GLI3R by the proteasome / FBXL7 down-regulates AURKA during mitotic entry and in early mitosis / Degradation of beta-catenin by the destruction complex / NOTCH1 Intracellular Domain Regulates Transcription / CLEC7A (Dectin-1) signaling / SCF(Skp2)-mediated degradation of p27/p21 / 2 iron, 2 sulfur cluster binding / multicellular organismal-level iron ion homeostasis / Constitutive Signaling by NOTCH1 PEST Domain Mutants / Constitutive Signaling by NOTCH1 HD+PEST Domain Mutants / beta-catenin binding / FCERI mediated NF-kB activation / Interleukin-1 signaling / Orc1 removal from chromatin / positive regulation of protein catabolic process / protein polyubiquitination / ubiquitin-protein transferase activity / Regulation of RUNX2 expression and activity / Cyclin D associated events in G1 / Regulation of PLK1 Activity at G2/M Transition / Circadian Clock / Antigen processing: Ubiquitination & Proteasome degradation / Downstream TCR signaling / Neddylation / iron ion transport / 4 iron, 4 sulfur cluster binding / proteasome-mediated ubiquitin-dependent protein catabolic process / intracellular iron ion homeostasis / protein ubiquitination / chromatin remodeling / iron ion binding / protein domain specific binding / centrosome / perinuclear region of cytoplasm / mitochondrion / RNA binding / nucleoplasm / nucleus / metal ion binding / cytosol / cytoplasm Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3 Å | ||||||
![]() | Wang, H. / Shi, H. / Zheng, N. | ||||||
Funding support | ![]()
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![]() | ![]() Title: FBXL5 Regulates IRP2 Stability in Iron Homeostasis via an Oxygen-Responsive [2Fe2S] Cluster. Authors: Hui Wang / Hui Shi / Malini Rajan / Elizabeth R Canarie / Seoyeon Hong / Daniele Simoneschi / Michele Pagano / Matthew F Bush / Stefan Stoll / Elizabeth A Leibold / Ning Zheng / ![]() Abstract: Cellular iron homeostasis is dominated by FBXL5-mediated degradation of iron regulatory protein 2 (IRP2), which is dependent on both iron and oxygen. However, how the physical interaction between ...Cellular iron homeostasis is dominated by FBXL5-mediated degradation of iron regulatory protein 2 (IRP2), which is dependent on both iron and oxygen. However, how the physical interaction between FBXL5 and IRP2 is regulated remains elusive. Here, we show that the C-terminal substrate-binding domain of FBXL5 harbors a [2Fe2S] cluster in the oxidized state. A cryoelectron microscopy (cryo-EM) structure of the IRP2-FBXL5-SKP1 complex reveals that the cluster organizes the FBXL5 C-terminal loop responsible for recruiting IRP2. Interestingly, IRP2 binding to FBXL5 hinges on the oxidized state of the [2Fe2S] cluster maintained by ambient oxygen, which could explain hypoxia-induced IRP2 stabilization. Steric incompatibility also allows FBXL5 to physically dislodge IRP2 from iron-responsive element RNA to facilitate its turnover. Taken together, our studies have identified an iron-sulfur cluster within FBXL5, which promotes IRP2 polyubiquitination and degradation in response to both iron and oxygen concentrations. | ||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 205.5 KB | Display | ![]() |
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PDB format | ![]() | 151.5 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 21149MC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 105165.328 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
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#2: Protein | Mass: 54832.441 Da / Num. of mol.: 1 / Fragment: UNP residues 183-674 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
#3: Protein | Mass: 18679.965 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
#4: Chemical | ChemComp-FES / |
Has ligand of interest | Y |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: IRP2-FBLX5-SKP1 complex / Type: COMPLEX / Entity ID: #1-#3 / Source: RECOMBINANT |
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Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() |
Buffer solution | pH: 8 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Details: unspecified |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Image recording | Electron dose: 73.8 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 955060 / Symmetry type: POINT | ||||||||||||||||||||||||
Refinement | Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2 | ||||||||||||||||||||||||
Refine LS restraints |
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