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- PDB-7vdd: Human TOM complex with cross-linking -

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Basic information

Entry
Database: PDB / ID: 7vdd
TitleHuman TOM complex with cross-linking
Components
  • Mitochondrial import receptor subunit TOM22 homolog
  • Mitochondrial import receptor subunit TOM40 homolog
  • Mitochondrial import receptor subunit TOM5 homolog
  • Mitochondrial import receptor subunit TOM6 homolog
  • Mitochondrial import receptor subunit TOM7 homolog
KeywordsTRANSLOCASE / Tom22 N-terminal domain / Cryo-EM
Function / homology
Function and homology information


TOM complex / mitochondrion targeting sequence binding / mitochondrial outer membrane translocase complex / mitochondria-associated endoplasmic reticulum membrane contact site / protein import into mitochondrial matrix / : / Mitochondrial protein import / protein targeting to mitochondrion / positive regulation of protein targeting to mitochondrion / protein insertion into mitochondrial outer membrane ...TOM complex / mitochondrion targeting sequence binding / mitochondrial outer membrane translocase complex / mitochondria-associated endoplasmic reticulum membrane contact site / protein import into mitochondrial matrix / : / Mitochondrial protein import / protein targeting to mitochondrion / positive regulation of protein targeting to mitochondrion / protein insertion into mitochondrial outer membrane / porin activity / pore complex / protein transmembrane transporter activity / monoatomic ion transport / PINK1-PRKN Mediated Mitophagy / regulation of protein stability / mitochondrial outer membrane / mitochondrial inner membrane / mitochondrion / membrane / cytosol
Similarity search - Function
Mitochondrial import receptor subunit TOM5, metazoa / Mitochondrial import receptor subunit TOM6 homologue / Mitochondrial import receptor subunit TOM6 homolog / Mitochondrial import receptor subunit Tom22 / Mitochondrial import receptor subunit TOM7 / Mitochondrial import receptor subunit Tom22 / TOM7 family / Mitochondrial outer membrane translocase complex, subunit Tom5 / Mitochondrial import receptor subunit or translocase / Tom40 ...Mitochondrial import receptor subunit TOM5, metazoa / Mitochondrial import receptor subunit TOM6 homologue / Mitochondrial import receptor subunit TOM6 homolog / Mitochondrial import receptor subunit Tom22 / Mitochondrial import receptor subunit TOM7 / Mitochondrial import receptor subunit Tom22 / TOM7 family / Mitochondrial outer membrane translocase complex, subunit Tom5 / Mitochondrial import receptor subunit or translocase / Tom40 / Eukaryotic porin/Tom40 / Eukaryotic porin / Porin domain superfamily
Similarity search - Domain/homology
Mitochondrial import receptor subunit TOM40 homolog / Mitochondrial import receptor subunit TOM5 homolog / Mitochondrial import receptor subunit TOM6 homolog / Mitochondrial import receptor subunit TOM22 homolog / Mitochondrial import receptor subunit TOM7 homolog
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.74 Å
AuthorsLiu, D.S. / Sui, S.F.
Funding support China, 1items
OrganizationGrant numberCountry
National Basic Research Program of China (973 Program) China
CitationJournal: Proc Natl Acad Sci U S A / Year: 2022
Title: Structural basis of Tom20 and Tom22 cytosolic domains as the human TOM complex receptors.
Authors: Jiayue Su / Desheng Liu / Fan Yang / Mei-Qing Zuo / Chang Li / Meng-Qiu Dong / Shan Sun / Sen-Fang Sui /
Abstract: Mitochondrial preproteins synthesized in cytosol are imported into mitochondria by a multisubunit translocase of the outer membrane (TOM) complex. Functioned as the receptor, the TOM complex ...Mitochondrial preproteins synthesized in cytosol are imported into mitochondria by a multisubunit translocase of the outer membrane (TOM) complex. Functioned as the receptor, the TOM complex components, Tom 20, Tom22, and Tom70, recognize the presequence and further guide the protein translocation. Their deficiency has been linked with neurodegenerative diseases and cardiac pathology. Although several structures of the TOM complex have been reported by cryoelectron microscopy (cryo-EM), how Tom22 and Tom20 function as TOM receptors remains elusive. Here we determined the structure of TOM core complex at 2.53 Å and captured the structure of the TOM complex containing Tom22 and Tom20 cytosolic domains at 3.74 Å. Structural analysis indicates that Tom20 and Tom22 share a similar three-helix bundle structural feature in the cytosolic domain. Further structure-guided biochemical analysis reveals that the Tom22 cytosolic domain is responsible for binding to the presequence, and the helix H1 is critical for this binding. Altogether, our results provide insights into the functional mechanism of the TOM complex recognizing and transferring preproteins across the mitochondrial membrane.
History
DepositionSep 6, 2021Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jul 13, 2022Provider: repository / Type: Initial release
Revision 1.1Jun 19, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Mitochondrial import receptor subunit TOM6 homolog
C: Mitochondrial import receptor subunit TOM22 homolog
D: Mitochondrial import receptor subunit TOM5 homolog
E: Mitochondrial import receptor subunit TOM5 homolog
F: Mitochondrial import receptor subunit TOM6 homolog
G: Mitochondrial import receptor subunit TOM7 homolog
H: Mitochondrial import receptor subunit TOM22 homolog
J: Mitochondrial import receptor subunit TOM7 homolog
B: Mitochondrial import receptor subunit TOM40 homolog
I: Mitochondrial import receptor subunit TOM40 homolog


Theoretical massNumber of molelcules
Total (without water)147,53810
Polymers147,53810
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration, gel filtration, gel filtration, gel filtration, gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area16800 Å2
ΔGint-165 kcal/mol
Surface area64430 Å2

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Components

#1: Protein Mitochondrial import receptor subunit TOM6 homolog / Overexpressed breast tumor protein / Translocase of outer membrane 6 kDa subunit homolog


Mass: 8007.988 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: TOMM6, OBTP, TOM6 / Production host: Homo sapiens (human) / References: UniProt: Q96B49
#2: Protein Mitochondrial import receptor subunit TOM22 homolog / hTom22 / 1C9-2 / Translocase of outer membrane 22 kDa subunit homolog


Mass: 15532.528 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: TOMM22, TOM22 / Production host: Homo sapiens (human) / References: UniProt: Q9NS69
#3: Protein Mitochondrial import receptor subunit TOM5 homolog


Mass: 6045.318 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: TOMM5, C9orf105, TOM5 / Production host: Homo sapiens (human) / References: UniProt: Q8N4H5
#4: Protein Mitochondrial import receptor subunit TOM7 homolog / Translocase of outer membrane 7 kDa subunit homolog


Mass: 6256.473 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: TOMM7, TOM7, TOMM07, AD-014 / Production host: Homo sapiens (human) / References: UniProt: Q9P0U1
#5: Protein Mitochondrial import receptor subunit TOM40 homolog / Protein Haymaker / Translocase of outer membrane 40 kDa subunit homolog / p38.5


Mass: 37926.926 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: TOMM40, C19orf1, PEREC1, TOM40 / Production host: Homo sapiens (human) / References: UniProt: O96008

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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: Human TOM complex with cross-linking / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: YES / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
EM embeddingMaterial: Digitonin
VitrificationCryogen name: ETHANE

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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: 1800 nm / Nominal defocus min: 1300 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.18.2_3874: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.74 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 340000 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0058365
ELECTRON MICROSCOPYf_angle_d0.45611312
ELECTRON MICROSCOPYf_dihedral_angle_d24.4051113
ELECTRON MICROSCOPYf_chiral_restr0.0361260
ELECTRON MICROSCOPYf_plane_restr0.0031457

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