- EMDB-20830: Cryo-EM reconstruction of the inner membrane rings containing the... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-20830
タイトル
Cryo-EM reconstruction of the inner membrane rings containing the core components of the export apparatus and associated membranes of the needle complex from Salmonella typhimurium type III secretion system.
マップデータ
試料
複合体: PrgH and PrgK, the protein components of the inner rings of the Salmonella's needle complex, in complex with the core components of the export apparatus and associated membranes.
National Institutes of Health/National Institute Of Allergy and Infectious Diseases
引用
ジャーナル: Proc Natl Acad Sci U S A / 年: 2019 タイトル: High-resolution view of the type III secretion export apparatus in situ reveals membrane remodeling and a secretion pathway. 著者: Carmen Butan / Maria Lara-Tejero / Wenwei Li / Jun Liu / Jorge E Galán / 要旨: Type III protein secretion systems are essential virulence factors for many important pathogenic bacteria. The entire protein secretion machine is composed of several substructures that organize into ...Type III protein secretion systems are essential virulence factors for many important pathogenic bacteria. The entire protein secretion machine is composed of several substructures that organize into a holostructure or injectisome. The core component of the injectisome is the needle complex, which houses the export apparatus that serves as a gate for the passage of the secreted proteins through the bacterial inner membrane. Here, we describe a high-resolution structure of the export apparatus of the type III secretion system in association with the needle complex and the underlying bacterial membrane, both in isolation and in situ. We show the precise location of the core export apparatus components within the injectisome and bacterial envelope and demonstrate that their deployment results in major membrane remodeling and thinning, which may be central for the protein translocation process. We also show that InvA, a critical export apparatus component, forms a multiring cytoplasmic conduit that provides a pathway for the type III secretion substrates to reach the entrance of the export gate. Combined with structure-guided mutagenesis, our studies provide major insight into potential mechanisms of protein translocation and injectisome assembly.
全体 : PrgH and PrgK, the protein components of the inner rings of the S...
全体
名称: PrgH and PrgK, the protein components of the inner rings of the Salmonella's needle complex, in complex with the core components of the export apparatus and associated membranes.
要素
複合体: PrgH and PrgK, the protein components of the inner rings of the Salmonella's needle complex, in complex with the core components of the export apparatus and associated membranes.
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超分子 #1: PrgH and PrgK, the protein components of the inner rings of the S...
超分子
名称: PrgH and PrgK, the protein components of the inner rings of the Salmonella's needle complex, in complex with the core components of the export apparatus and associated membranes. タイプ: complex / ID: 1 / 親要素: 0