7E4I image
Deposition Date 2021-02-13
Release Date 2021-09-01
Last Version Date 2025-07-02
Entry Detail
PDB ID:
7E4I
Keywords:
TRANSLOCASE
Title:
Cryo-EM structure of the yeast mitochondrial SAM-Tom40/Tom5/Tom6 complex at 3.0 angstrom
Biological Source:
Source Organism:
Saccharomyces cerevisiae S288c (Taxon ID: 559292)
Host Organism:
Homo sapiens
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
3.05 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
7E4I validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Sorting assembly machinery 50 kDa subunit
Gene (Uniprot):SAM50
Chain IDs:A
Chain Length:485
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae S288c
UniProt ID:P53969 Pfam ID:PF01103
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Sorting assembly machinery 35 kDa subunit
Gene (Uniprot):SAM35
Chain IDs:B
Chain Length:329
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae S288c
UniProt ID:P14693 Pfam ID:PF10806
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Sorting assembly machinery 37 kDa subunit
Gene (Uniprot):SAM37
Chain IDs:C
Chain Length:351
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae S288c
UniProt ID:P50110 Pfam ID:PF10568, PF11801
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Mitochondrial import receptor subunit TOM40
Gene (Uniprot):TOM40
Chain IDs:D
Chain Length:406
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae S288c
UniProt ID:P23644 Pfam ID:PF01459
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Mitochondrial import receptor subunit TOM5
Gene (Uniprot):TOM5
Chain IDs:E
Chain Length:52
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae S288c
UniProt ID:P80967 Pfam ID:PF10642
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Mitochondrial import receptor subunit TOM6
Gene (Uniprot):TOM6
Chain IDs:F
Chain Length:62
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae S288c
UniProt ID:P33448 Pfam ID:PF17112
Ligand Molecules
NA
Primary Citation
Structural insight into the SAM-mediated assembly of the mitochondrial TOM core complex.
Science 373 1377 1381 (2021)
PMID: 34446444 DOI: 10.1126/science.abh0704

Abstact

β barrel outer membrane proteins (β-OMPs) play vital roles in mitochondria, chloroplasts, and Gram-negative bacteria. Evolutionarily conserved complexes such as the mitochondrial sorting and assembly machinery (SAM) mediate the assembly of β-OMPs. We investigated the SAM-mediated assembly of the translocase of the outer membrane (TOM) core complex. Cryo–electron microscopy structures of SAM–fully folded Tom40 and the SAM-Tom40/Tom5/Tom6 complexes at ~3-angstrom resolution reveal that Sam37 stabilizes the mature Tom40 mainly through electrostatic interactions, thus facilitating subsequent TOM assembly. These results support the β barrel switching model and provide structural insights into the assembly and release of β barrel complexes.

Legend

Protein

Chemical

Disease

Primary Citation of related structures
7E4I