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データを開く
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基本情報
登録情報 | データベース: PDB / ID: 8dql | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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タイトル | CryoEM structure of IglD | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | Secretion system protein | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | PROTEIN TRANSPORT / T6SS / baseplate | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
機能・相同性 | Type VI secretion system TssK / Intracellular growth locus![]() | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
生物種 | ![]() | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3 Å | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | Liu, X. / Clemens, D. / Lee, B. / Yang, X. / Zhou, H. / Horwitz, M. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Atomic Structure of IglD Demonstrates Its Role as a Component of the Baseplate Complex of the Type VI Secretion System. 著者: Xiaoyu Liu / Daniel L Clemens / Bai-Yu Lee / Xue Yang / Z Hong Zhou / Marcus A Horwitz / ![]() ![]() 要旨: Francisella tularensis, a Tier 1 select agent of bioterrorism, contains a type VI secretion system (T6SS) encoded within the pathogenicity island (FPI), which is critical for its pathogenesis. Among ...Francisella tularensis, a Tier 1 select agent of bioterrorism, contains a type VI secretion system (T6SS) encoded within the pathogenicity island (FPI), which is critical for its pathogenesis. Among the 18 proteins encoded by FPI is IglD, which is essential to 's intracellular growth and virulence, but neither its location within T6SS nor its functional role has been established. Here, we present the cryoEM structure of IglD from Francisella novicida and show that the IglD forms a homotrimer that is structurally homologous to the T6SS baseplate protein TssK in Escherichia coli. Each IglD monomer consists of an N-terminal β-sandwich domain, a 4-helix bundle domain, and a flexible C-terminal domain. While the overall folds of IglD and TssK are similar, the two structures differ in three aspects: the relative orientation between their β-sandwich and the 4-helix bundle domains; two insertion loops present in TssK's β-sandwich domain; and, consequently, a lack of subunit-subunit interaction between insertion loops in the IglD trimer. Phylogenetic analysis indicates that IglD is genetically remote from the TssK orthologs in other T6SSs. While the other components of the baseplate are unknown, we conducted pulldown assays showing IglJ interacts with IglD and IglH, pointing to a model wherein IglD, IglH, and IglJ form the baseplate of the T6SS. Alanine substitution mutagenesis further established that IglD's hydrophobic pocket in the N-terminal β-sandwich domain interacts with two loops of IglJ, reminiscent of the TssK-TssG interaction. These results form a framework for understanding the hitherto unexplored T6SS baseplate. Francisella tularensis is a facultatively intracellular Gram-negative bacterium that causes the serious and potentially fatal zoonotic illness, tularemia. Because of its extraordinarily high infectivity and mortality to humans, especially when inhaled, F. tularensis is considered a potential bioterrorism agent and is classified as a Tier 1 select agent. The type VI secretion system (T6SS) encoded within the pathogenicity island (FPI) is critical to its pathogenesis, but its baseplate components are largely unknown. Here, we report the cryoEM structure of IglD from Francisella novicida and demonstrate its role as a component of the baseplate complex of the T6SS. We further show that IglD interacts with IglJ and IglH, and propose a model in which these proteins interact to form the T6SS baseplate. Elucidation of the structure and composition of the baseplate should facilitate the design of strategies to prevent and treat infections caused by F. tularensis. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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ダウンロードとリンク
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ダウンロード
PDBx/mmCIF形式 | ![]() | 154.4 KB | 表示 | ![]() |
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PDB形式 | ![]() | 118 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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-関連構造データ
関連構造データ | ![]() 27656MC M: このデータのモデリングに利用したマップデータ C: 同じ文献を引用 ( |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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リンク
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集合体
登録構造単位 | ![]()
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要素
#1: タンパク質 | 分子量: 49562.379 Da / 分子数: 3 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 遺伝子: FNC33_03540 発現宿主: ![]() 参照: UniProt: A0A6I4RY94 Has protein modification | N | |
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-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法 |
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試料調製
構成要素 | 名称: IglD trimer / タイプ: COMPLEX / Entity ID: all / 由来: RECOMBINANT |
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由来(天然) | 生物種: ![]() |
由来(組換発現) | 生物種: ![]() |
緩衝液 | pH: 7.4 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
急速凍結 | 凍結剤: ETHANE |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TITAN KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2600 nm / 最小 デフォーカス(公称値): 1800 nm |
撮影 | 電子線照射量: 50 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) |
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解析
ソフトウェア | 名称: PHENIX / バージョン: 1.19.2_4158: / 分類: 精密化 | ||||||||||||||||||||||||
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EMソフトウェア | 名称: PHENIX / カテゴリ: モデル精密化 | ||||||||||||||||||||||||
CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3次元再構成 | 解像度: 3 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 1138462 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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