5LJO

E. coli BAM complex (BamABCDE) by cryoEM


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.9 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.2 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: 10.1038/ncomms12865

  • 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. ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Outer membrane protein assembly factor BamB
B
371Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: bamB (yfgL)
Find proteins for P77774 (Escherichia coli (strain K12))
Go to UniProtKB:  P77774
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Outer membrane protein assembly factor BamC
C
165Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: bamC (dapX, nlpB)
Find proteins for P0A903 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A903
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Outer membrane protein assembly factor BamD
D
218Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: bamD (yfiO)
Find proteins for P0AC02 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AC02
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Outer membrane protein assembly factor BamE
E
87Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: bamE (smpA)
Find proteins for P0A937 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A937
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
Outer membrane protein assembly factor BamA
A
783Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: bamA (yaeT, yzzN, yzzY)
Find proteins for P0A940 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A940
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.9 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



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 

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