- EMDB-46780: E. coli TonB-ExbBD TonB bound to ExbB chain A -
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基本情報
登録情報
データベース: EMDB / ID: EMD-46780
タイトル
E. coli TonB-ExbBD TonB bound to ExbB chain A
マップデータ
TonB-ExbBD TonB bound to ExbB chainA
試料
複合体: TonB-ExbBD complex
タンパク質・ペプチド: Biopolymer transport protein ExbB
タンパク質・ペプチド: Protein TonB
タンパク質・ペプチド: Biopolymer transport protein ExbD
キーワード
Ton system / TRANSPORT PROTEIN
機能・相同性
機能・相同性情報
receptor-mediated bacteriophage irreversible attachment to host cell / colicin transport / ferrichrome import into cell / energy transducer activity / bacteriocin transport / cobalamin transport / siderophore transport / intracellular monoatomic cation homeostasis / transmembrane transporter complex / plasma membrane protein complex ...receptor-mediated bacteriophage irreversible attachment to host cell / colicin transport / ferrichrome import into cell / energy transducer activity / bacteriocin transport / cobalamin transport / siderophore transport / intracellular monoatomic cation homeostasis / transmembrane transporter complex / plasma membrane protein complex / protein import / cell envelope / transmembrane transporter activity / cell outer membrane / transmembrane transport / protein transport / outer membrane-bounded periplasmic space / intracellular iron ion homeostasis / protein stabilization / protein domain specific binding / protein homodimerization activity / identical protein binding / membrane / plasma membrane 類似検索 - 分子機能
: / TonB polyproline region / Gram-negative bacterial TonB protein / : / TonB C-terminal domain profile. / TonB-system energizer ExbB type-1 / TonB, C-terminal / Gram-negative bacterial TonB protein C-terminal / TonB system transport protein ExbD type-1 / TonB/TolA, C-terminal ...: / TonB polyproline region / Gram-negative bacterial TonB protein / : / TonB C-terminal domain profile. / TonB-system energizer ExbB type-1 / TonB, C-terminal / Gram-negative bacterial TonB protein C-terminal / TonB system transport protein ExbD type-1 / TonB/TolA, C-terminal / : / Biopolymer transport protein ExbD/TolR / Biopolymer transport protein ExbD/TolR / MotA/TolQ/ExbB proton channel / MotA/TolQ/ExbB proton channel family 類似検索 - ドメイン・相同性
Protein TonB / Biopolymer transport protein ExbB / Biopolymer transport protein ExbD 類似検索 - 構成要素
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)
ZIA DK011011-17
米国
引用
ジャーナル: Nat Commun / 年: 2025 タイトル: Cryo-EM structures of the E. coli Ton and Tol motor complexes. 著者: Herve Celia / Istvan Botos / Rodolfo Ghirlando / Denis Duché / Bridgette M Beach / Roland Lloubes / Susan K Buchanan / 要旨: The Ton and Tol motor proteins use the proton gradient at the inner membrane of Gram-negative bacteria as an energy source. The generated force is transmitted through the periplasmic space to protein ...The Ton and Tol motor proteins use the proton gradient at the inner membrane of Gram-negative bacteria as an energy source. The generated force is transmitted through the periplasmic space to protein components associated with the outer membrane, either to maintain the outer membrane integrity for the Tol system, or to allow essential nutrients to enter the cell for Ton. We have solved the high-resolution structures of the E. coli TonB-ExbB-ExbD and TolA-TolQ-TolR complexes, revealing the inner membrane embedded engine parts of the Ton and Tol systems, and showing how TonB and TolA interact with the ExbBD and TolQR subcomplexes. Structural similarities between the two motor complexes suggest a common mechanism for the opening of the proton channel and the propagation of the proton motive force into movement of the TonB and TolA subunits. Because TonB and TolA bind at preferential ExbB or TolQ subunits, we propose a new mechanism of assembly of TonB and TolA with their respective ExbBD and TolQR subcomplexes and discuss its impact on the mechanism of action for the Ton and Tol systems.