- EMDB-53380: cryo-EM structure of TolQR conformation2 in SMA nanodiscs -
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基本情報
登録情報
データベース: EMDB / ID: EMD-53380
タイトル
cryo-EM structure of TolQR conformation2 in SMA nanodiscs
マップデータ
試料
複合体: cryo-EM structure of TolQR conformation2 in SMA nanodiscs
タンパク質・ペプチド: Tol-Pal system protein TolQ
タンパク質・ペプチド: Tol-Pal system protein TolR
タンパク質・ペプチド: Tol-Pal system protein TolA
キーワード
Molecular motor Multi-pass membrane protein Accumulates at cell constriction sites. / MEMBRANE PROTEIN
機能・相同性
機能・相同性情報
cellular response to bacteriocin / regulation of membrane invagination / cell septum assembly / bacteriocin transport / toxin transmembrane transporter activity / protein import / virion binding / cell envelope / cell division site / transmembrane transporter activity ...cellular response to bacteriocin / regulation of membrane invagination / cell septum assembly / bacteriocin transport / toxin transmembrane transporter activity / protein import / virion binding / cell envelope / cell division site / transmembrane transporter activity / disordered domain specific binding / protein transport / protein domain specific binding / cell division / symbiont entry into host cell / membrane / plasma membrane 類似検索 - 分子機能
TolA C-terminal / Tol-Pal system, TolQ / Tol-Pal system protein TolR / Tol-Pal system, TolA / : / 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
Tol-Pal system protein TolQ / Tol-Pal system protein TolR / Tol-Pal system protein TolA 類似検索 - 構成要素
National Natural Science Foundation of China (NSFC)
32170029
中国
引用
ジャーナル: Cell Discov / 年: 2025 タイトル: Deciphering the molecular mechanism of the bacterial division motor TolQRA. 著者: Chongrong Shen / Teng Xie / Yongbo Luo / Fangyuan Zhao / Xin Wang / Zhibo Zhang / Jie Pang / Jierou Zhang / Xintan Dong / Shenghai Chang / Bi-Sen Ding / Binwu Ying / Wei Chi / Zhaoming Su / ...著者: Chongrong Shen / Teng Xie / Yongbo Luo / Fangyuan Zhao / Xin Wang / Zhibo Zhang / Jie Pang / Jierou Zhang / Xintan Dong / Shenghai Chang / Bi-Sen Ding / Binwu Ying / Wei Chi / Zhaoming Su / Ruhong Zhou / Xiaodi Tang / Haohao Dong / 要旨: The Tol-Pal system is essential for maintaining outer membrane (OM) stability during cell division in Gram-negative bacteria. The inner membrane complex TolQRA harnesses proton motive force (PMF) to ...The Tol-Pal system is essential for maintaining outer membrane (OM) stability during cell division in Gram-negative bacteria. The inner membrane complex TolQRA harnesses proton motive force (PMF) to establish transient interactions within the periplasm, thereby coordinating cell envelope remodeling and facilitating OM invagination at division sites. However, the precise mechanism remains unclear. Here, we present cryo-electron microscopy structures of Escherichia coli TolQRA in multiple conformational states at 2.92-3.52 Å resolution, revealing rotary dynamics within the complex. Computational simulations reveal a proton-conductive channel comprising the putative proton-accepting residue Asp23 and the conserved polar residues Thr145 and Thr178, with monitored inter-residue distances providing support for a proton-driven rotary mechanism. Site-directed mutagenesis combined with functional assays validates the AlphaFold-predicted structure of the periplasmic domains of TolR and TolA, and further pinpoints critical residues required for complex function. Together, these findings advance our understanding of TolQRA-mediated proton transduction and offer new avenues for antibiotic drug development.