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基本情報
登録情報 | データベース: PDB / ID: 9jod | ||||||||||||
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タイトル | Capsid structure of Escherichia phage Mu | ||||||||||||
![]() | Major capsid protein | ||||||||||||
![]() | VIRAL PROTEIN / capsid / phage | ||||||||||||
機能・相同性 | viral capsid, major subunit / Bacteriophage Mu, GpT / Mu-like prophage major head subunit gpT / host cell cytoplasm / Major capsid protein![]() | ||||||||||||
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: 3.2 Å | ||||||||||||
![]() | Zhou, J.Q. / Liu, H.R. | ||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: structures of the contractile nanomachine myophage Mu in both its extended and contracted states. 著者: Junquan Zhou / Liwen Wang / Hao Xiao / Wenyuan Chen / Zhonghua Liu / Jingdong Song / Jing Zheng / Hongrong Liu / ![]() 要旨: Myophage Mu is a representative of contractile nanomachines with a simple tail baseplate. It has the capacity to infect a range of intestinal bacteria and has extensive applications in genetic ...Myophage Mu is a representative of contractile nanomachines with a simple tail baseplate. It has the capacity to infect a range of intestinal bacteria and has extensive applications in genetic engineering research. Nevertheless, a comprehensive understanding of the entire structure and contractile mechanisms of Mu remains elusive. Using cryo-electron microscopy (cryo-EM), we resolved the asymmetric structures of Mu in both its extended and contracted states, the latter of which lacked the tail baseplate, at near-atomic resolutions. We built the atomic models for the extended Mu, encompassing the head, the connector complex, the tail, and the simple baseplate. It is noteworthy that we identified the position and structure of the tail tube initiator protein gp43 (referred to as the DNA circularization protein). The protein gp43 plays a crucial role not only in the baseplate assembly and DNA circularization but also in stabilizing the wedge-hub connection and mediating tail contraction. Except for the baseplate structure, the structural comparison of Mu in its extended and contracted states revealed that only the tail sheath protein gp39 and the C-terminus of the tail terminator protein gp37 undergo notable conformational changes to accommodate the tail contraction, whereas the remaining protein components remained unchanged. Our structures exhibited conserved properties among the majority of myophages, thereby providing valuable insights into the contraction mechanisms across myophages and contractile injection systems (CISs). IMPORTANCE: Despite extensive study, the asymmetric structures of phage Mu, a highly effective transposable myophage, remain unknown. In this study, we present the high-resolution structures of Mu in ...IMPORTANCE: Despite extensive study, the asymmetric structures of phage Mu, a highly effective transposable myophage, remain unknown. In this study, we present the high-resolution structures of Mu in both its extended and contracted states. The comparison of the two structures allows for the illustration of detailed conformational changes of the head-to-tail complex during the process of tail contraction. The contraction mechanism of Mu is highly conserved and widely adapted to all contractile nanomachines that share common structural features with Mu. | ||||||||||||
履歴 |
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 404.4 KB | 表示 | ![]() |
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PDB形式 | ![]() | 336.5 KB | 表示 | ![]() |
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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 | ![]() 61659MC ![]() 9khxC ![]() 9khyC ![]() 9ki1C ![]() 9knuC ![]() 9lj8C 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: 34197.691 Da / 分子数: 7 / 由来タイプ: 天然 / 由来: (天然) ![]() 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: Escherichia phage Mu / タイプ: COMPLEX / Entity ID: all / 由来: NATURAL |
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由来(天然) | 生物種: ![]() |
ウイルスについての詳細 | 中空か: NO / エンベロープを持つか: NO / 単離: SPECIES / タイプ: VIRION |
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: TFS 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): 4000 nm / 最小 デフォーカス(公称値): 2000 nm |
撮影 | 電子線照射量: 35 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) |
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解析
CTF補正 | タイプ: NONE | ||||||||||||||||||||||||
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3次元再構成 | 解像度: 3.2 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 55035 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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