Bacterial outer membrane proteins assemble via asymmetric interactions with the BamA β-barrel.

Abstract:

:The integration of β-barrel proteins into the bacterial outer membrane (OM) is catalysed by the β-barrel assembly machinery (BAM). The central BAM subunit (BamA) itself contains a β-barrel domain that is essential for OM protein biogenesis, but its mechanism of action is unknown. To elucidate its function, here we develop a method to trap a native Escherichia coli β-barrel protein bound stably to BamA at a late stage of assembly in vivo. Using disulfide-bond crosslinking, we find that the first β-strand of a laterally 'open' form of the BamA β-barrel forms a rigid interface with the C-terminal β-strand of the substrate. In contrast, the lipid-facing surface of the last two BamA β-strands forms weaker, conformationally heterogeneous interactions with the first β-strand of the substrate that likely represent intermediate assembly states. Based on our results, we propose that BamA promotes the membrane integration of partially folded β-barrels by a 'swing' mechanism.

journal_name

Nat Commun

journal_title

Nature communications

authors

Doyle MT,Bernstein HD

doi

10.1038/s41467-019-11230-9

subject

Has Abstract

pub_date

2019-07-26 00:00:00

pages

3358

issue

1

issn

2041-1723

pii

10.1038/s41467-019-11230-9

journal_volume

10

pub_type

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