ジャーナル: Cell Rep / 年: 2025 タイトル: Optimal functioning of the Lpt bridge depends on a ternary complex between the lipocalin YedD and the LptDE translocon. 著者: Alexandra Gennaris / Van Son Nguyen / Laurie Thouvenel / Naemi Csoma / Didier Vertommen / Bogdan Iuliu Iorga / Han Remaut / Jean-François Collet / 要旨: The outer membrane is an efficient permeability barrier that protects gram-negative bacteria against external assaults, including many antibiotics. The unique permeability features of the outer ...The outer membrane is an efficient permeability barrier that protects gram-negative bacteria against external assaults, including many antibiotics. The unique permeability features of the outer membrane are due to the presence of lipopolysaccharide (LPS) molecules in its outer leaflet. LPS transport relies on the essential lipopolysaccharide transport (Lpt) pathway, which forms a bridge from the inner to the outer membrane. The LptDE translocon inserts LPS into the outer leaflet. Here, we identify the lipocalin YedD as a component of the translocon. Cryoelectron microscopy of the YedD-LptDE complex reveals that YedD binds LptD at a critical interface between its β-barrel and periplasmic β-taco domain. The YedD-LptDE complex is functionally relevant: under conditions where the connectivity of the β-taco and Lpt bridge is compromised, the absence of YedD decreases cell viability and causes LPS accumulation in the inner membrane. Our findings establish YedD as an Lpt component required for optimal LPS transport.
全体 : LPS-assembly complex LptDE with lipoprotein YedD
全体
名称: LPS-assembly complex LptDE with lipoprotein YedD
要素
複合体: LPS-assembly complex LptDE with lipoprotein YedD
タンパク質・ペプチド: LPS-assembly protein LptD
タンパク質・ペプチド: LPS-assembly lipoprotein LptE
タンパク質・ペプチド: Uncharacterized lipoprotein YedD
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超分子 #1: LPS-assembly complex LptDE with lipoprotein YedD
超分子
名称: LPS-assembly complex LptDE with lipoprotein YedD / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all 詳細: The LptDE-YedD complex was purified from over-expression of the three components in E. coli. Strep-tag was on the C-terminal of LptE while his-tag was on the C-terminal of YedD. Double pull ...詳細: The LptDE-YedD complex was purified from over-expression of the three components in E. coli. Strep-tag was on the C-terminal of LptE while his-tag was on the C-terminal of YedD. Double pull was done using 1, streptactin and 2, Ni-NTA.