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

Matthew G. Iadanza, Anna J. Higgins, Bob Schiffrin, Antonio N. Calabrese, David J. Brockwell, Alison E. Ashcroft, Sheena E. Radford () and Neil A. Ranson ()
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Matthew G. Iadanza: Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds
Anna J. Higgins: Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds
Bob Schiffrin: Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds
Antonio N. Calabrese: Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds
David J. Brockwell: Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds
Alison E. Ashcroft: Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds
Sheena E. Radford: Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds
Neil A. Ranson: Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds

Nature Communications, 2016, vol. 7, issue 1, 1-12

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms12865

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