5LJO

E. coli BAM complex (BamABCDE) by cryoEM


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Lateral opening in the intact beta-barrel assembly machinery captured by cryo-EM.

Iadanza, M.G.Higgins, A.J.Schiffrin, B.Calabrese, A.N.Brockwell, D.J.Ashcroft, A.E.Radford, S.E.Ranson, N.A.

(2016) Nat Commun 7: 12865-12865

  • DOI: https://doi.org/10.1038/ncomms12865
  • Primary Citation of Related Structures:  
    5LJO

  • PubMed Abstract: 

    The β-barrel assembly machinery (BAM) is a ∼203 kDa complex of five proteins (BamA-E), which is essential for viability in E. coli. BAM promotes the folding and insertion of β-barrel proteins into the outer membrane via a poorly understood mechanism. Several current models suggest that BAM functions through a 'lateral gating' motion of the β-barrel of BamA. Here we present a cryo-EM structure of the BamABCDE complex, at 4.9 Å resolution. The structure is in a laterally open conformation showing that gating is independent of BamB binding. We describe conformational changes throughout the complex and interactions between BamA, B, D and E, and the detergent micelle that suggest communication between BAM and the lipid bilayer. Finally, using an enhanced reconstitution protocol and functional assays, we show that for the outer membrane protein OmpT, efficient folding in vitro requires lateral gating in BAM.


  • Organizational Affiliation

    Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds, Mount Preston Street, Leeds LS2 9JT, UK.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Outer membrane protein assembly factor BamBA [auth B]371Escherichia coli K-12Mutation(s): 0 
Gene Names: bamByfgLb2512JW2496
Membrane Entity: Yes 
UniProt
Find proteins for P77774 (Escherichia coli (strain K12))
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Go to UniProtKB:  P77774
Entity Groups  
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UniProt GroupP77774
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Outer membrane protein assembly factor BamCB [auth C]165Escherichia coli K-12Mutation(s): 0 
Gene Names: bamCdapXnlpBb2477JW2462
Membrane Entity: Yes 
UniProt
Find proteins for P0A903 (Escherichia coli (strain K12))
Explore P0A903 
Go to UniProtKB:  P0A903
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UniProt GroupP0A903
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Outer membrane protein assembly factor BamDC [auth D]218Escherichia coliMutation(s): 0 
Gene Names: bamDyfiOZ3889ECs3458
Membrane Entity: Yes 
UniProt
Find proteins for P0AC02 (Escherichia coli (strain K12))
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UniProt GroupP0AC02
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Outer membrane protein assembly factor BamED [auth E]87Escherichia coliMutation(s): 0 
Gene Names: bamEsmpAc3139
Membrane Entity: Yes 
UniProt
Find proteins for P0A937 (Escherichia coli (strain K12))
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Go to UniProtKB:  P0A937
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UniProt GroupP0A937
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Outer membrane protein assembly factor BamAE [auth A]783Escherichia coliMutation(s): 0 
Gene Names: bamAyaeTECS88_0187
Membrane Entity: Yes 
UniProt
Find proteins for P0A940 (Escherichia coli (strain K12))
Explore P0A940 
Go to UniProtKB:  P0A940
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UniProt GroupP0A940
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION1.4
MODEL REFINEMENTRosettaEM

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research CouncilUnited KingdomFP7/2007-2013)/ERC Grant Agreement 32240
Wellcome TrustUnited Kingdom105220/Z/14/Z
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/K000659/1
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/J014443/1
Wellcome TrustUnited Kingdom090932/Z/09/Z
Wellcome TrustUnited Kingdom094232/Z/10/Z
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/E012558/1
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/M012573/1

Revision History  (Full details and data files)

  • Version 1.0: 2016-10-12
    Type: Initial release
  • Version 1.1: 2017-01-18
    Changes: Database references
  • Version 1.2: 2017-08-30
    Changes: Author supporting evidence, Experimental preparation
  • Version 1.3: 2024-05-08
    Changes: Data collection, Database references