- EMDB-51565: Cryo-EM structure of a contractile injection system in Streptomyc... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-51565
タイトル
Cryo-EM structure of a contractile injection system in Streptomyces coelicolor, the baseplate complex in extended state applied 3-fold symmetry.
マップデータ
試料
複合体: The baseplate module applied 3-fold symmetry of a contractile injection system in Streptomyces coelicolor
タンパク質・ペプチド: Gp5/Type VI secretion system Vgr protein OB-fold domain-containing protein
キーワード
Contractile injection system / STRUCTURAL PROTEIN
機能・相同性
: / Phage tail baseplate hub (GPD) / Gp5/Type VI secretion system Vgr protein, OB-fold domain / Type VI secretion system/phage-baseplate injector OB domain / Vgr protein, OB-fold domain superfamily / Gp5/Type VI secretion system Vgr protein OB-fold domain-containing protein
Biotechnology and Biological Sciences Research Council (BBSRC)
BB/T015349/1
英国
Biotechnology and Biological Sciences Research Council (BBSRC)
BB/X01097X/1
英国
引用
ジャーナル: Elife / 年: 2025 タイトル: Function and firing of the contractile injection system requires the membrane protein CisA. 著者: Bastien Casu / Joseph W Sallmen / Peter E Haas / Govind Chandra / Pavel Afanasyev / Jingwei Xu / Martin Pilhofer / Susan Schlimpert / 要旨: Bacterial contractile injection systems (CIS) are phage tail-like macromolecular complexes that mediate cell-cell interactions by injecting effector proteins into target cells. CIS from (CIS) are ...Bacterial contractile injection systems (CIS) are phage tail-like macromolecular complexes that mediate cell-cell interactions by injecting effector proteins into target cells. CIS from (CIS) are localized in the cytoplasm. Under stress, they induce cell death and impact the life cycle. It remains unknown, however, whether CIS require accessory proteins to directly interact with the cytoplasmic membrane to function. Here, we characterize the putative membrane adaptor CisA, a conserved factor in CIS gene clusters across species. We show by cryo-electron tomography imaging and in vivo assays that CIS contraction and function depend on CisA. Using single-particle cryo-electron microscopy, we provide an atomic model of the extended CIS apparatus; however, CisA is not part of the complex. Instead, our findings show that CisA is a membrane protein with a cytoplasmic N-terminus predicted to interact with CIS components, thereby providing a possible mechanism for mediating CIS recruitment to the membrane and subsequent firing. Our work shows that CIS function in multicellular bacteria is distinct from type VI secretion systems and extracellular CIS, and possibly evolved due to the role CIS play in regulated cell death.
全体 : The baseplate module applied 3-fold symmetry of a contractile inj...
全体
名称: The baseplate module applied 3-fold symmetry of a contractile injection system in Streptomyces coelicolor
要素
複合体: The baseplate module applied 3-fold symmetry of a contractile injection system in Streptomyces coelicolor
タンパク質・ペプチド: Gp5/Type VI secretion system Vgr protein OB-fold domain-containing protein
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超分子 #1: The baseplate module applied 3-fold symmetry of a contractile inj...
超分子
名称: The baseplate module applied 3-fold symmetry of a contractile injection system in Streptomyces coelicolor タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all
由来(天然)
生物種: Streptomyces coelicolor A3(2) (バクテリア)
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分子 #1: Gp5/Type VI secretion system Vgr protein OB-fold domain-containin...
分子
名称: Gp5/Type VI secretion system Vgr protein OB-fold domain-containing protein タイプ: protein_or_peptide / ID: 1 / コピー数: 3 / 光学異性体: LEVO