7SGR

Structure of hemolysin A secretion system HlyB/D complex

7SGR の概要

• エントリーDOI: 10.2210/pdb7sgr/pdb
• EMDBエントリー: 25116
• 分子名称: Alpha-hemolysin translocation ATP-binding protein HlyB, Membrane fusion protein (MFP) family protein,Hemolysin secretion protein D, chromosomal, [(2~{R})-1-[2-azanylethoxy(oxidanyl)phosphoryl]oxy-3-hexadecanoyloxy-propan-2-yl] (~{Z})-octadec-9-enoate (3 entities in total)
• 機能のキーワード: hydrolase, transport, membrane protein
• 由来する生物種: Escherichia coli CFT073; 詳細
• タンパク質・核酸の鎖数: 12
• 化学式量合計: 748788.17

構造登録者

Zhao, H.,Chen, J. (登録日: 2021-10-07, 公開日: 2022-09-14, 最終更新日: 2024-06-05)

主引用文献

Zhao, H.,Lee, J.,Chen, J.
The hemolysin A secretion system is a multi-engine pump containing three ABC transporters.
Cell, 185:3329-3340.e13, 2022

PubMed Abstract: Type 1 secretion systems (T1SSs) are widespread in pathogenic Gram-negative bacteria, extruding protein substrates following synthesis of the entire polypeptide. The Escherichia coli hemolysin A secretion system has long been considered a prototype in structural and mechanistic studies of T1SSs. Three membrane proteins-an inner membrane ABC transporter HlyB, an adaptor protein HlyD, and an outer membrane porin TolC-are required for secretion. However, the stoichiometry and structure of the complex are unknown. Here, cryo-electron microscopy (cryo-EM) structures determined in two conformations reveal that the inner membrane complex is a hetero-dodecameric assembly comprising three HlyB homodimers and six HlyD subunits. Functional studies indicate that oligomerization of HlyB and HlyD is essential for protein secretion and that polypeptides translocate through a canonical ABC transporter pathway in HlyB. Our data suggest that T1SSs entail three ABC transporters, one that functions as a protein channel and two that allosterically power the translocation process.

PubMed: 36055198
DOI: 10.1016/j.cell.2022.07.017

実験手法

ELECTRON MICROSCOPY (2.9 Å)