8XVA

Human TOM complex with whole Tom20


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.92 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


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Literature

Structure of the intact Tom20 receptor in the human translocase of the outer membrane complex.

Su, J.Tian, X.Wang, Z.Yang, J.Sun, S.Sui, S.F.

(2024) PNAS Nexus 3: pgae269-pgae269

  • DOI: https://doi.org/10.1093/pnasnexus/pgae269
  • Primary Citation of Related Structures:  
    8XVA

  • PubMed Abstract: 

    The translocase of the outer membrane (TOM) complex serves as the main gate for preproteins entering mitochondria and thus plays a pivotal role in sustaining mitochondrial stability. Precursor proteins, featuring amino-terminal targeting signals (presequences) or internal targeting signals, are recognized by the TOM complex receptors Tom20, Tom22, and Tom70, and then translocated into mitochondria through Tom40. By using chemical cross-linking to stabilize Tom20 in the TOM complex, this study unveils the structure of the human TOM holo complex, encompassing the intact Tom20 component, at a resolution of approximately 6 Å by cryo-electron microscopy. Our structure shows the TOM holo complex containing only one Tom20 subunit, which is located right at the center of the complex and stabilized by extensive interactions with Tom22, Tom40, and Tom6. Based on the structure, we proposed a possible translocation mode of TOM complex, by which different receptors could work simultaneously to ensure that the preproteins recognized by them are all efficiently translocated into the mitochondria.


  • Organizational Affiliation

    State Key Laboratory of Membrane Biology, Beijing Frontier Research Center for Biological Structure, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mitochondrial import receptor subunit TOM6 homolog
A, F
74Homo sapiensMutation(s): 0 
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PHAROS:  Q96B49
GTEx:  ENSG00000214736 
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UniProt GroupQ96B49
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Mitochondrial import receptor subunit TOM40 homolog
B, I
361Homo sapiensMutation(s): 0 
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Find proteins for O96008 (Homo sapiens)
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PHAROS:  O96008
GTEx:  ENSG00000130204 
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UniProt GroupO96008
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Mitochondrial import receptor subunit TOM22 homolog
C, H
142Homo sapiensMutation(s): 0 
Gene Names: TOMM22TOM22
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GTEx:  ENSG00000100216 
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UniProt GroupQ9NS69
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Mitochondrial import receptor subunit TOM5 homolog
D, E
51Homo sapiensMutation(s): 0 
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GTEx:  ENSG00000175768 
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Mitochondrial import receptor subunit TOM7 homolog
G, J
55Homo sapiensMutation(s): 0 
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GTEx:  ENSG00000196683 
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Mitochondrial import receptor subunit TOM20 homolog145Homo sapiensMutation(s): 0 
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GTEx:  ENSG00000173726 
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.92 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China32071192

Revision History  (Full details and data files)

  • Version 1.0: 2024-08-07
    Type: Initial release