- EMDB-0869: Cryo-EM structure of the MgtE Mg2+ channel under Mg2+-free conditions -
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基本情報
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データベース: EMDB / ID: EMD-0869
タイトル
Cryo-EM structure of the MgtE Mg2+ channel under Mg2+-free conditions
マップデータ
試料
複合体: MgtE-Fab complex
タンパク質・ペプチド: Magnesium transporter MgtE
タンパク質・ペプチド: Fab light chain
タンパク質・ペプチド: Fab heavy chain
機能・相同性
機能・相同性情報
magnesium ion transport / magnesium ion transmembrane transporter activity / magnesium ion binding / protein homodimerization activity / identical protein binding / plasma membrane 類似検索 - 分子機能
MgtE, N-terminal domain superfamily / SLC41A/MgtE, integral membrane domain / Magnesium transporter, MgtE intracellular domain / Magnesium transporter MgtE / SLC41A/MgtE divalent cation transporters, integral membrane domain superfamily / Divalent cation transporter / MgtE intracellular N domain / MgtE intracellular N domain / CBS domain superfamily / Domain in cystathionine beta-synthase and other proteins. ...MgtE, N-terminal domain superfamily / SLC41A/MgtE, integral membrane domain / Magnesium transporter, MgtE intracellular domain / Magnesium transporter MgtE / SLC41A/MgtE divalent cation transporters, integral membrane domain superfamily / Divalent cation transporter / MgtE intracellular N domain / MgtE intracellular N domain / CBS domain superfamily / Domain in cystathionine beta-synthase and other proteins. / CBS domain / CBS domain / CBS domain profile. 類似検索 - ドメイン・相同性
ジャーナル: PLoS Biol / 年: 2021 タイトル: The structure of MgtE in the absence of magnesium provides new insights into channel gating. 著者: Fei Jin / Minxuan Sun / Takashi Fujii / Yurika Yamada / Jin Wang / Andrés D Maturana / Miki Wada / Shichen Su / Jinbiao Ma / Hironori Takeda / Tsukasa Kusakizako / Atsuhiro Tomita / Yoshiko ...著者: Fei Jin / Minxuan Sun / Takashi Fujii / Yurika Yamada / Jin Wang / Andrés D Maturana / Miki Wada / Shichen Su / Jinbiao Ma / Hironori Takeda / Tsukasa Kusakizako / Atsuhiro Tomita / Yoshiko Nakada-Nakura / Kehong Liu / Tomoko Uemura / Yayoi Nomura / Norimichi Nomura / Koichi Ito / Osamu Nureki / Keiichi Namba / So Iwata / Ye Yu / Motoyuki Hattori / 要旨: MgtE is a Mg2+ channel conserved in organisms ranging from prokaryotes to eukaryotes, including humans, and plays an important role in Mg2+ homeostasis. The previously determined MgtE structures in ...MgtE is a Mg2+ channel conserved in organisms ranging from prokaryotes to eukaryotes, including humans, and plays an important role in Mg2+ homeostasis. The previously determined MgtE structures in the Mg2+-bound, closed-state, and structure-based functional analyses of MgtE revealed that the binding of Mg2+ ions to the MgtE cytoplasmic domain induces channel inactivation to maintain Mg2+ homeostasis. There are no structures of the transmembrane (TM) domain for MgtE in Mg2+-free conditions, and the pore-opening mechanism has thus remained unclear. Here, we determined the cryo-electron microscopy (cryo-EM) structure of the MgtE-Fab complex in the absence of Mg2+ ions. The Mg2+-free MgtE TM domain structure and its comparison with the Mg2+-bound, closed-state structure, together with functional analyses, showed the Mg2+-dependent pore opening of MgtE on the cytoplasmic side and revealed the kink motions of the TM2 and TM5 helices at the glycine residues, which are important for channel activity. Overall, our work provides structure-based mechanistic insights into the channel gating of MgtE.