- EMDB-61993: Structure of the Salmonella flagellar FliPQR complex reconstitute... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-61993
タイトル
Structure of the Salmonella flagellar FliPQR complex reconstituted in the peptidisc
マップデータ
試料
複合体: Structure of the Salmonella flagellar FliPQR complex reconstituted in the peptidisc
タンパク質・ペプチド: Flagellar biosynthetic protein FliP
タンパク質・ペプチド: Flagellar biosynthetic protein FliR
タンパク質・ペプチド: Flagellar biosynthetic protein FliQ
キーワード
Bacterial flagellum / flagellar assembly / electron Cryomicroscopy / type III secretion system / Salmonella / PROTEIN TRANSPORT / MOTOR PROTEIN
機能・相同性
機能・相同性情報
bacterial-type flagellum basal body / bacterial-type flagellum-dependent swarming motility / bacterial-type flagellum assembly / protein secretion / protein targeting / plasma membrane 類似検索 - 分子機能
Flagellar biosynthesis protein FliQ / Flagellar transport protein FliP / Flagellar biosynthesis protein FliR / Bacterial export protein family 3 / Bacterial export proteins, family 3 / Flagella transport protein fliP family signature 1. / Type III secretion system inner membrane P protein / FliP family / Flagella transport protein fliP family signature 2. / Type III secretion system inner membrane R protein / Bacterial export proteins, family 1 類似検索 - ドメイン・相同性
Flagellar biosynthetic protein FliQ / Flagellar biosynthetic protein FliP / Flagellar biosynthetic protein FliR 類似検索 - 構成要素
生物種
Salmonella enterica subsp. enterica serovar Typhimurium str. LT2 (サルモネラ菌)
Japan Agency for Medical Research and Development (AMED)
JP19am0101117
日本
Japan Agency for Medical Research and Development (AMED)
JP21am0101117
日本
Japan Agency for Medical Research and Development (AMED)
JP17pc0101020
日本
Ministry of Education, Culture, Sports, Science and Technology (Japan)
JP20H05532
日本
Ministry of Education, Culture, Sports, Science and Technology (Japan)
JP22H04844
日本
引用
ジャーナル: Proc Natl Acad Sci U S A / 年: 2025 タイトル: A β-cap on the FliPQR protein-export channel acts as the cap for initial flagellar rod assembly. 著者: Miki Kinoshita / Tomoko Miyata / Fumiaki Makino / Katsumi Imada / Keiichi Namba / Tohru Minamino / 要旨: The FliPQR complex constitutes a channel for export of the flagellar proteins involved in axial structure assembly. It also serves as a template for the assembly of the rod structure, which consists ...The FliPQR complex constitutes a channel for export of the flagellar proteins involved in axial structure assembly. It also serves as a template for the assembly of the rod structure, which consists of FliE, FlgB, FlgC, FlgF, and FlgG. FliP, FliQ, and FliR assemble into a right-handed helical structure within the central pore of the flagellar basal body MS-ring, and the complex has two gates on the cytoplasmic and periplasmic sides. The periplasmic gate, formed by the N-terminal α-helices of FliP and FliR, remains closed until six FliE subunits assemble onto FliP and FliR to form the first layer of the rod, but it has remained unclear how each FliE subunit opens the gate and assembles in the absence of the rod cap required for efficient assembly of other rod proteins. Here, we present a cryoelectron microscopy structure of the FliPQR complex in closed form at 3.0 Å resolution. A β-cap, formed by the N-terminal β-strands of FliP and FliR, is located at the top of the FliPQR complex and tightly seals the closed gate. The β-cap has a narrow pore that efficiently and accurately leads the first FliE subunit to its assembly site. Interactions of FliE with FliP and FliR induce a conformational change in FliP and FliR, with their N-terminal α-helices move up and outward to open the gate. Consequently, each of the N-terminal β-strands of FliP and FliR detaches from the β-cap one after another, thereby creating a docking site for the next FliE subunit to efficiently assemble.