- EMDB-13930: 3D reconstruction of the membrane domains of the sialic acid TRAP... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-13930
タイトル
3D reconstruction of the membrane domains of the sialic acid TRAP transporter HiSiaQM from Haemophilus influenzae in lipid nanodiscs bound to a high affinity megabody
マップデータ
3D reconstruction of HiSiaQM with a megabody bound to the periplasmic side
試料
複合体: HiSiaQM/Megabody complex
タンパク質・ペプチド: Sialic acid TRAP transporter permease protein SiaT
タンパク質・ペプチド: Megabody3
キーワード
membrane transporter / TRAP / sialic acid / elevator / TRANSPORT PROTEIN
機能・相同性
TRAP transporter large membrane protein DctM / TRAP transporter, small membrane protein DctQ / TRAP C4-dicarboxylate transport system permease DctM subunit / Tripartite ATP-independent periplasmic transporters, DctQ component / Tripartite ATP-independent periplasmic transporter, DctM component / transmembrane transporter activity / plasma membrane / Sialic acid TRAP transporter permease protein SiaT
ジャーナル: Nat Commun / 年: 2022 タイトル: Structural and mechanistic analysis of a tripartite ATP-independent periplasmic TRAP transporter. 著者: Martin F Peter / Jan A Ruland / Peer Depping / Niels Schneberger / Emmanuele Severi / Jonas Moecking / Karl Gatterdam / Sarah Tindall / Alexandre Durand / Veronika Heinz / Jan Peter Siebrasse ...著者: Martin F Peter / Jan A Ruland / Peer Depping / Niels Schneberger / Emmanuele Severi / Jonas Moecking / Karl Gatterdam / Sarah Tindall / Alexandre Durand / Veronika Heinz / Jan Peter Siebrasse / Paul-Albert Koenig / Matthias Geyer / Christine Ziegler / Ulrich Kubitscheck / Gavin H Thomas / Gregor Hagelueken / 要旨: Tripartite ATP-independent periplasmic (TRAP) transporters are found widely in bacteria and archaea and consist of three structural domains, a soluble substrate-binding protein (P-domain), and two ...Tripartite ATP-independent periplasmic (TRAP) transporters are found widely in bacteria and archaea and consist of three structural domains, a soluble substrate-binding protein (P-domain), and two transmembrane domains (Q- and M-domains). HiSiaPQM and its homologs are TRAP transporters for sialic acid and are essential for host colonization by pathogenic bacteria. Here, we reconstitute HiSiaQM into lipid nanodiscs and use cryo-EM to reveal the structure of a TRAP transporter. It is composed of 16 transmembrane helices that are unexpectedly structurally related to multimeric elevator-type transporters. The idiosyncratic Q-domain of TRAP transporters enables the formation of a monomeric elevator architecture. A model of the tripartite PQM complex is experimentally validated and reveals the coupling of the substrate-binding protein to the transporter domains. We use single-molecule total internal reflection fluorescence (TIRF) microscopy in solid-supported lipid bilayers and surface plasmon resonance to study the formation of the tripartite complex and to investigate the impact of interface mutants. Furthermore, we characterize high-affinity single variable domains on heavy chain (VHH) antibodies that bind to the periplasmic side of HiSiaQM and inhibit sialic acid uptake, providing insight into how TRAP transporter function might be inhibited in vivo.