YegP-like superfamily / Baseplate protein J-like / Baseplate J-like protein / IraD/Gp25-like / Baseplate wedge protein gp25 / Type VI secretion system, RhsGE-associated Vgr protein / Conserved hypothetical protein CHP02241 / Bacteriophage T4, Gp19, tail tube / T4-like virus tail tube protein gp19 / Gp5/Type VI secretion system Vgr protein, OB-fold domain ...YegP-like superfamily / Baseplate protein J-like / Baseplate J-like protein / IraD/Gp25-like / Baseplate wedge protein gp25 / Type VI secretion system, RhsGE-associated Vgr protein / Conserved hypothetical protein CHP02241 / Bacteriophage T4, Gp19, tail tube / T4-like virus tail tube protein gp19 / Gp5/Type VI secretion system Vgr protein, OB-fold domain / Type VI secretion system/phage-baseplate injector OB domain / Tail sheath protein, subtilisin-like domain / Phage tail sheath protein subtilisin-like domain / Vgr protein, OB-fold domain superfamily / Tail sheath protein, C-terminal domain / Phage tail sheath C-terminal domain 類似検索 - ドメイン・相同性
All3325 protein / All3324 protein / All3323 protein / Asl3322 protein / All3321 protein / All3320 protein / All3318 protein / All3317 protein / All3316 protein / All3315 protein / All3314 protein 類似検索 - 構成要素
ジャーナル: Nat Microbiol / 年: 2022 タイトル: Structure of a thylakoid-anchored contractile injection system in multicellular cyanobacteria. 著者: Gregor L Weiss / Fabian Eisenstein / Ann-Katrin Kieninger / Jingwei Xu / Hannah A Minas / Milena Gerber / Miki Feldmüller / Iris Maldener / Karl Forchhammer / Martin Pilhofer / 要旨: Contractile injection systems (CISs) mediate cell-cell interactions by phage tail-like structures, using two distinct modes of action: extracellular CISs are released into the medium, while type 6 ...Contractile injection systems (CISs) mediate cell-cell interactions by phage tail-like structures, using two distinct modes of action: extracellular CISs are released into the medium, while type 6 secretion systems (T6SSs) are attached to the cytoplasmic membrane and function upon cell-cell contact. Here, we characterized a CIS in the multicellular cyanobacterium Anabaena, with features distinct from extracellular CISs and T6SSs. Cryo-electron tomography of focused ion beam-milled cells revealed that CISs were anchored in thylakoid membrane stacks, facing the cell periphery. Single particle cryo-electron microscopy showed that this unique in situ localization was mediated by extensions of tail fibre and baseplate components. On stress, cyanobacteria induced the formation of ghost cells, presenting thylakoid-anchored CISs to the environment. Functional assays suggest that these CISs may mediate ghost cell formation and/or interactions of ghost cells with other organisms. Collectively, these data provide a framework for understanding the evolutionary re-engineering of CISs and potential roles of these CISs in cyanobacterial programmed cell death.