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- PDB-9j79: Cryo-EM structure of CRL2-FEM1B bound with TOM20(tetramer) -

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Entry
Database: PDB / ID: 9j79
TitleCryo-EM structure of CRL2-FEM1B bound with TOM20(tetramer)
Components
  • (Poly-UNK) x 2
  • Cullin-2
  • E3 ubiquitin-protein ligase RBX1, N-terminally processed
  • Elongin-B
  • Elongin-C
  • Mitochondrial import receptor subunit TOM20 homolog
  • Protein fem-1 homolog B
KeywordsPROTEIN BINDING / ubiquitination E3 ligase / Cryo-EM
Function / homology
Function and homology information


tRNA import into mitochondrion / TOM complex / regulation of ubiquitin-protein transferase activity / epithelial cell maturation involved in prostate gland development / mitochondrion targeting sequence binding / response to 3,3',5-triiodo-L-thyronine / mitochondrial outer membrane translocase complex / mitochondria-associated endoplasmic reticulum membrane contact site / migrasome / protein import into mitochondrial matrix ...tRNA import into mitochondrion / TOM complex / regulation of ubiquitin-protein transferase activity / epithelial cell maturation involved in prostate gland development / mitochondrion targeting sequence binding / response to 3,3',5-triiodo-L-thyronine / mitochondrial outer membrane translocase complex / mitochondria-associated endoplasmic reticulum membrane contact site / migrasome / protein import into mitochondrial matrix / protein-transporting ATPase activity / branching involved in prostate gland morphogenesis / cullin-RING-type E3 NEDD8 transferase / NEDD8 transferase activity / cullin-RING ubiquitin ligase complex / cellular response to chemical stress / Mitochondrial protein import / regulation of DNA damage checkpoint / Cul7-RING ubiquitin ligase complex / ubiquitin-dependent protein catabolic process via the C-end degron rule pathway / target-directed miRNA degradation / Loss of Function of FBXW7 in Cancer and NOTCH1 Signaling / VCB complex / elongin complex / positive regulation of protein autoubiquitination / protein neddylation / regulation of extrinsic apoptotic signaling pathway via death domain receptors / death receptor binding / NEDD8 ligase activity / negative regulation of response to oxidative stress / Cul5-RING ubiquitin ligase complex / protein targeting to mitochondrion / SCF ubiquitin ligase complex / Cul2-RING ubiquitin ligase complex / ubiquitin-ubiquitin ligase activity / negative regulation of type I interferon production / Cul4A-RING E3 ubiquitin ligase complex / SCF-dependent proteasomal ubiquitin-dependent protein catabolic process / Cul3-RING ubiquitin ligase complex / Cul4B-RING E3 ubiquitin ligase complex / ubiquitin ligase complex scaffold activity / negative regulation of mitophagy / Prolactin receptor signaling / response to muscle activity / protein insertion into mitochondrial outer membrane / cullin family protein binding / Pausing and recovery of Tat-mediated HIV elongation / Tat-mediated HIV elongation arrest and recovery / HIV elongation arrest and recovery / Pausing and recovery of HIV elongation / protein monoubiquitination / ubiquitin ligase complex / Tat-mediated elongation of the HIV-1 transcript / ubiquitin-like ligase-substrate adaptor activity / Formation of HIV-1 elongation complex containing HIV-1 Tat / protein K48-linked ubiquitination / Formation of HIV elongation complex in the absence of HIV Tat / RNA Polymerase II Transcription Elongation / Nuclear events stimulated by ALK signaling in cancer / Formation of RNA Pol II elongation complex / sperm midpiece / RNA Polymerase II Pre-transcription Events / regulation of cellular response to insulin stimulus / positive regulation of TORC1 signaling / post-translational protein modification / intrinsic apoptotic signaling pathway / negative regulation of insulin receptor signaling pathway / Regulation of BACH1 activity / T cell activation / PINK1-PRKN Mediated Mitophagy / transcription corepressor binding / cell periphery / cellular response to amino acid stimulus / transcription initiation at RNA polymerase II promoter / TP53 Regulates Transcription of DNA Repair Genes / Degradation of DVL / transcription elongation by RNA polymerase II / Degradation of GLI1 by the proteasome / Recognition of DNA damage by PCNA-containing replication complex / GSK3B and BTRC:CUL1-mediated-degradation of NFE2L2 / negative regulation of canonical Wnt signaling pathway / Negative regulation of NOTCH4 signaling / Vif-mediated degradation of APOBEC3G / Hedgehog 'on' state / G1/S transition of mitotic cell cycle / 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 / DNA Damage Recognition in GG-NER / Inactivation of CSF3 (G-CSF) signaling / RING-type E3 ubiquitin transferase / Degradation of beta-catenin by the destruction complex / Oxygen-dependent proline hydroxylation of Hypoxia-inducible Factor Alpha / Evasion by RSV of host interferon responses / NOTCH1 Intracellular Domain Regulates Transcription / Dual Incision in GG-NER / Transcription-Coupled Nucleotide Excision Repair (TC-NER) / Formation of TC-NER Pre-Incision Complex / Constitutive Signaling by NOTCH1 PEST Domain Mutants / Constitutive Signaling by NOTCH1 HD+PEST Domain Mutants
Similarity search - Function
Protein import receptor MAS20, metazoan / Protein import receptor MAS20 / Mitochondrial outer membrane translocase complex, Tom20 domain superfamily / MAS20 protein import receptor / Zinc finger, RING-H2-type / RING-H2 zinc finger domain / Cullin protein neddylation domain / : / Cullin, conserved site / Cullin family signature. ...Protein import receptor MAS20, metazoan / Protein import receptor MAS20 / Mitochondrial outer membrane translocase complex, Tom20 domain superfamily / MAS20 protein import receptor / Zinc finger, RING-H2-type / RING-H2 zinc finger domain / Cullin protein neddylation domain / : / Cullin, conserved site / Cullin family signature. / Cullin repeat-like-containing domain superfamily / Cullin protein, neddylation domain / Cullin / Cullin protein neddylation domain / Elongin-C / Elongin B / Cullin / Cullin, N-terminal / Cullin homology domain / Cullin homology domain superfamily / Cullin family / Cullin family profile. / S-phase kinase-associated protein 1-like / SKP1 component, POZ domain / Skp1 family, tetramerisation domain / Found in Skp1 protein family / Ankyrin repeat / SKP1/BTB/POZ domain superfamily / Ankyrin repeats (3 copies) / Ankyrin repeat profile. / Ankyrin repeat region circular profile. / ankyrin repeats / Ankyrin repeat / Zinc finger RING-type profile. / Ankyrin repeat-containing domain superfamily / Zinc finger, RING-type / Ubiquitin family / Ubiquitin homologues / Ubiquitin domain profile. / Ubiquitin-like domain / Zinc finger, RING/FYVE/PHD-type / Ubiquitin-like domain superfamily / Winged helix DNA-binding domain superfamily / Winged helix-like DNA-binding domain superfamily
Similarity search - Domain/homology
E3 ubiquitin-protein ligase RBX1 / Cullin-2 / Elongin-C / Elongin-B / Mitochondrial import receptor subunit TOM20 homolog / Protein fem-1 homolog B
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.08 Å
AuthorsZhao, S. / Xu, C.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Nat Chem Biol / Year: 2025
Title: TOM20-driven E3 ligase recruitment regulates mitochondrial dynamics through PLD6.
Authors: Anat Raiff / Shidong Zhao / Aizat Bekturova / Colin Zenge / Shir Mazor / Xinyan Chen / Wenwen Ru / Yaara Makaros / Tslil Ast / Alban Ordureau / Chao Xu / Itay Koren /
Abstract: Mitochondrial homeostasis is maintained through complex regulatory mechanisms, including the balance of mitochondrial dynamics involving fusion and fission processes. A central player in this ...Mitochondrial homeostasis is maintained through complex regulatory mechanisms, including the balance of mitochondrial dynamics involving fusion and fission processes. A central player in this regulation is the ubiquitin-proteasome system (UPS), which controls the degradation of pivotal mitochondrial proteins. In this study, we identified cullin-RING E3 ligase 2 (CRL2) and its substrate receptor, FEM1B, as critical regulators of mitochondrial dynamics. Through proteomic analysis, we demonstrate here that FEM1B controls the turnover of PLD6, a key regulator of mitochondrial dynamics. Using structural and biochemical approaches, we show that FEM1B physically interacts with PLD6 and that this interaction is facilitated by the direct association of FEM1B with the mitochondrial import receptor TOM20. Ablation of FEM1B or disruption of the FEM1B-TOM20 interaction impairs PLD6 degradation and induces mitochondrial defects, phenocopying PLD6 overexpression. These findings underscore the importance of FEM1B in maintaining mitochondrial morphology and provide further mechanistic insights into how the UPS regulates mitochondrial homeostasis.
History
DepositionAug 18, 2024Deposition site: PDBJ / Processing site: PDBC
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Revision 1.1Apr 30, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
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Revision 1.2May 7, 2025Group: Data collection / Database references / Category: citation / em_admin
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
E: Cullin-2
F: Elongin-C
H: Elongin-B
I: E3 ubiquitin-protein ligase RBX1, N-terminally processed
K: Cullin-2
L: Elongin-C
M: Elongin-B
N: E3 ubiquitin-protein ligase RBX1, N-terminally processed
J: Protein fem-1 homolog B
A: Protein fem-1 homolog B
B: Mitochondrial import receptor subunit TOM20 homolog
G: Mitochondrial import receptor subunit TOM20 homolog
D: Poly-UNK
O: Protein fem-1 homolog B
P: Protein fem-1 homolog B
S: Mitochondrial import receptor subunit TOM20 homolog
C: Mitochondrial import receptor subunit TOM20 homolog
Q: Poly-UNK
R: Poly-UNK
hetero molecules


Theoretical massNumber of molelcules
Total (without water)584,61725
Polymers584,22519
Non-polymers3926
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Protein , 6 types, 16 molecules EKFLHMINJAOPBGSC

#1: Protein Cullin-2 / CUL-2


Mass: 87114.750 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CUL2 / Production host: Escherichia coli (E. coli) / References: UniProt: Q13617
#2: Protein Elongin-C / EloC / Elongin 15 kDa subunit / RNA polymerase II transcription factor SIII subunit C / SIII p15 / ...EloC / Elongin 15 kDa subunit / RNA polymerase II transcription factor SIII subunit C / SIII p15 / Transcription elongation factor B polypeptide 1


Mass: 10843.420 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ELOC, TCEB1 / Production host: Escherichia coli (E. coli) / References: UniProt: Q15369
#3: Protein Elongin-B / EloB / Elongin 18 kDa subunit / RNA polymerase II transcription factor SIII subunit B / SIII p18 / ...EloB / Elongin 18 kDa subunit / RNA polymerase II transcription factor SIII subunit B / SIII p18 / Transcription elongation factor B polypeptide 2


Mass: 13348.964 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ELOB, TCEB2 / Production host: Escherichia coli (E. coli) / References: UniProt: Q15370
#4: Protein E3 ubiquitin-protein ligase RBX1, N-terminally processed / E3 ubiquitin-protein transferase RBX1 / N-terminally processed


Mass: 11196.830 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: RBX1, RNF75, ROC1 / Production host: Escherichia coli (E. coli) / References: UniProt: P62877
#5: Protein
Protein fem-1 homolog B / FEM1b / FEM1-beta / Fem-1-like death receptor-binding protein alpha / Fem-1-like in apoptotic ...FEM1b / FEM1-beta / Fem-1-like death receptor-binding protein alpha / Fem-1-like in apoptotic pathway protein alpha / F1A-alpha


Mass: 70355.062 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: FEM1B, F1AA, KIAA0396 / Production host: Escherichia coli (E. coli) / References: UniProt: Q9UK73
#6: Protein
Mitochondrial import receptor subunit TOM20 homolog / Mitochondrial 20 kDa outer membrane protein / Outer mitochondrial membrane receptor Tom20


Mass: 13839.889 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: TOMM20, KIAA0016 / Production host: Escherichia coli (E. coli) / References: UniProt: Q15388

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Protein/peptide , 2 types, 3 molecules DRQ

#7: Protein/peptide Poly-UNK


Mass: 869.063 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Escherichia coli (E. coli)
#8: Protein/peptide Poly-UNK


Mass: 698.854 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Escherichia coli (E. coli)

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Non-polymers , 1 types, 6 molecules

#9: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION

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Details

Has ligand of interestY
Has protein modificationN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Cryo-EM structure of CRL2-FEM1B bound with TOM20(tetramer)
Type: COMPLEX / Details: CUL2-FEM1B BOUND WITH TOM20 / Entity ID: #1-#8 / Source: MULTIPLE SOURCES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R2/1
VitrificationCryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277.15 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2900 nm / Nominal defocus min: 1800 nm
Specimen holderCryogen: NITROGEN
Image recordingElectron dose: 55.8 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K3 (6k x 4k)
EM imaging opticsEnergyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 4.08 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 92948 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00237390
ELECTRON MICROSCOPYf_angle_d0.55850619
ELECTRON MICROSCOPYf_dihedral_angle_d4.4955057
ELECTRON MICROSCOPYf_chiral_restr0.045767
ELECTRON MICROSCOPYf_plane_restr0.0046547

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