6WUM

Mitochondrial SAM complex - dimer 2 in detergent


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural insight into mitochondrial beta-barrel outer membrane protein biogenesis.

Diederichs, K.A.Ni, X.Rollauer, S.E.Botos, I.Tan, X.King, M.S.Kunji, E.R.S.Jiang, J.Buchanan, S.K.

(2020) Nat Commun 11: 3290-3290

  • DOI: 10.1038/s41467-020-17144-1
  • Primary Citation of Related Structures:  
    6WUM, 6WUL, 6WUN, 6WUH, 6WUJ, 6WUT

  • PubMed Abstract: 
  • In mitochondria, β-barrel outer membrane proteins mediate protein import, metabolite transport, lipid transport, and biogenesis. The Sorting and Assembly Machinery (SAM) complex consists of three proteins that assemble as a 1:1:1 complex to fold β-ba ...

    In mitochondria, β-barrel outer membrane proteins mediate protein import, metabolite transport, lipid transport, and biogenesis. The Sorting and Assembly Machinery (SAM) complex consists of three proteins that assemble as a 1:1:1 complex to fold β-barrel proteins and insert them into the mitochondrial outer membrane. We report cryoEM structures of the SAM complex from Myceliophthora thermophila, which show that Sam50 forms a 16-stranded transmembrane β-barrel with a single polypeptide-transport-associated (POTRA) domain extending into the intermembrane space. Sam35 and Sam37 are located on the cytosolic side of the outer membrane, with Sam35 capping Sam50, and Sam37 interacting extensively with Sam35. Sam35 and Sam37 each adopt a GST-like fold, with no functional, structural, or sequence similarity to their bacterial counterparts. Structural analysis shows how the Sam50 β-barrel opens a lateral gate to accommodate its substrates.


    Organizational Affiliation

    Laboratory of Molecular Biology, National Institute of Diabetes & Digestive & Kidney Diseases, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD, 20892, USA. susan.buchanan2@nih.gov.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Sam35A, E332Thermothelomyces thermophilusMutation(s): 0 
Gene Names: MYCTH_2142789
Find proteins for G2QAT9 (Myceliophthora thermophila (strain ATCC 42464 / BCRC 31852 / DSM 1799))
Explore G2QAT9 
Go to UniProtKB:  G2QAT9
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Tom37 domain-containing proteinC, b479Thermothelomyces thermophilusMutation(s): 0 
Gene Names: MYCTH_2293977
Find proteins for G2Q6R7 (Myceliophthora thermophila (strain ATCC 42464 / BCRC 31852 / DSM 1799))
Explore G2Q6R7 
Go to UniProtKB:  G2Q6R7
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Bac_surface_Ag domain-containing proteinB, a512Thermothelomyces thermophilusMutation(s): 0 
Gene Names: MYCTH_2094326
Find proteins for G2QFF9 (Myceliophthora thermophila (strain ATCC 42464 / BCRC 31852 / DSM 1799))
Explore G2QFF9 
Go to UniProtKB:  G2QFF9
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)United States--

Revision History 

  • Version 1.0: 2020-08-12
    Type: Initial release
  • Version 1.1: 2020-08-19
    Changes: Database references