6LYU

Structure of the BAM complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Literature

Structures of the beta-barrel assembly machine recognizing outer membrane protein substrates.

Xiao, L.Han, L.Li, B.Zhang, M.Zhou, H.Luo, Q.Zhang, X.Huang, Y.

(2021) FASEB J 35: e21207-e21207

  • DOI: 10.1096/fj.202001443RR
  • Primary Citation of Related Structures:  
    6LYS, 6LYU, 6LYR, 6LYQ

  • PubMed Abstract: 
  • β-barrel outer membrane proteins (β-OMPs) play critical roles in nutrition acquisition, protein import/export, and other fundamental biological processes. The assembly of β-OMPs in Gram-negative bacteria is mediated by the β-barrel assembly machinery ...

    β-barrel outer membrane proteins (β-OMPs) play critical roles in nutrition acquisition, protein import/export, and other fundamental biological processes. The assembly of β-OMPs in Gram-negative bacteria is mediated by the β-barrel assembly machinery (BAM) complex, yet its precise mechanism remains elusive. Here, we report two structures of the BAM complex in detergents and in nanodisks, and two crystal structures of the BAM complex with bound substrates. Structural analysis indicates that the membrane compositions surrounding the BAM complex could modulate its overall conformations, indicating low energy barriers between different conformational states and a highly dynamic nature of the BAM complex. Importantly, structures of the BAM complex with bound substrates and the related functional analysis show that the first β-strand of the BamA β-barrel (β1 BamA ) in the BAM complex is associated with the last but not the first β-strand of a β-OMP substrate via antiparallel β-strand interactions. These observations are consistent with the β-signal hypothesis during β-OMP biogenesis, and suggest that the β1 BamA strand in the BAM complex may interact with the last β-strand of an incoming β-OMP substrate upon their release from the chaperone-bound state.


    Organizational Affiliation

    University of Chinese Academy of Sciences, Beijing, China.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Outer membrane protein assembly factor BamAA810Escherichia coli K-12Mutation(s): 0 
Gene Names: bamAyaeTyzzNyzzYb0177JW0172
Find proteins for P0A940 (Escherichia coli (strain K12))
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Go to UniProtKB:  P0A940
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Outer membrane protein assembly factor BamBB400Escherichia coli K-12Mutation(s): 0 
Gene Names: bamByfgLb2512JW2496
Find proteins for P77774 (Escherichia coli (strain K12))
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Outer membrane protein assembly factor BamCC344Escherichia coli K-12Mutation(s): 0 
Gene Names: bamCdapXnlpBb2477JW2462
Find proteins for P0A903 (Escherichia coli (strain K12))
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Go to UniProtKB:  P0A903
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Outer membrane protein assembly factor BamDD245Escherichia coli K-12Mutation(s): 0 
Gene Names: bamDyfiOb2595JW2577
Find proteins for P0AC02 (Escherichia coli (strain K12))
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Go to UniProtKB:  P0AC02
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Outer membrane protein assembly factor BamEE119Escherichia coli K-12Mutation(s): 0 
Gene Names: bamEsmpAb2617JW2598
Find proteins for P0A937 (Escherichia coli (strain K12))
Explore P0A937 
Go to UniProtKB:  P0A937
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2020-02-15 
  • Released Date: 2021-01-13 
  • Deposition Author(s): Xiao, L., Huang, Y.

Revision History 

  • Version 1.0: 2021-01-13
    Type: Initial release