7RI6

Structure of BAM in MSP1E3D1 nanodiscs prepared from E. coli outer membranes

7RI6 の概要

• エントリーDOI: 10.2210/pdb7ri6/pdb
• EMDBエントリー: 24473 24474 24475 24476 24477 24478
• 分子名称: Outer membrane protein assembly factor BamA, Outer membrane protein assembly factor BamB, Outer membrane protein assembly factor BamC, ... (5 entities in total)
• 機能のキーワード: bam, native membrane, membrane protein
• 由来する生物種: Escherichia coli; 詳細
• タンパク質・核酸の鎖数: 5
• 化学式量合計: 210826.21

構造登録者

Wu, R.R.,Noinaj, N. (登録日: 2021-07-19, 公開日: 2021-12-22, 最終更新日: 2024-11-06)

主引用文献

Wu, R.,Bakelar, J.W.,Lundquist, K.,Zhang, Z.,Kuo, K.M.,Ryoo, D.,Pang, Y.T.,Sun, C.,White, T.,Klose, T.,Jiang, W.,Gumbart, J.C.,Noinaj, N.
Plasticity within the barrel domain of BamA mediates a hybrid-barrel mechanism by BAM.
Nat Commun, 12:7131-7131, 2021

PubMed Abstract: In Gram-negative bacteria, the biogenesis of β-barrel outer membrane proteins is mediated by the β-barrel assembly machinery (BAM). The mechanism employed by BAM is complex and so far- incompletely understood. Here, we report the structures of BAM in nanodiscs, prepared using polar lipids and native membranes, where we observe an outward-open state. Mutations in the barrel domain of BamA reveal that plasticity in BAM is essential, particularly along the lateral seam of the barrel domain, which is further supported by molecular dynamics simulations that show conformational dynamics in BAM are modulated by the accessory proteins. We also report the structure of BAM in complex with EspP, which reveals an early folding intermediate where EspP threads from the underside of BAM and incorporates into the barrel domain of BamA, supporting a hybrid-barrel budding mechanism in which the substrate is folded into the membrane sequentially rather than as a single unit.

PubMed: 34880256
DOI: 10.1038/s41467-021-27449-4

実験手法

ELECTRON MICROSCOPY (5.9 Å)