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-Structure paper
タイトル | Ejectosome of bacteriophage ΦM1. |
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ジャーナル・号・ページ | PNAS Nexus, Vol. 3, Issue 9, Page pgae416, Year 2024 |
掲載日 | 2024年9月19日 |
![]() | Alice-Roza Eruera / James Hodgkinson-Bean / Georgia L Rutter / Francesca R Hills / Rosheny Kumaran / Alexander J M Crowe / Nickhil Jadav / Fangfang Chang / Klemens McJarrow-Keller / Fátima Jorge / Jaekyung Hyun / Hyejin Kim / Bumhan Ryu / Mihnea Bostina / ![]() ![]() |
PubMed 要旨 | Podophages that infect gram-negative bacteria, such as pathogen ΦM1, encode tail assemblies too short to extend across the complex gram-negative cell wall. To overcome this, podophages encode a ...Podophages that infect gram-negative bacteria, such as pathogen ΦM1, encode tail assemblies too short to extend across the complex gram-negative cell wall. To overcome this, podophages encode a large protein complex (ejectosome) packaged inside the viral capsid and correspondingly ejected during infection to form a transient channel that spans the periplasmic space. Here, we describe the ejectosome of bacteriophage ΦM1 to a resolution of 3.32 Å by single-particle cryo-electron microscopy (cryo-EM). The core consists of tetrameric and octameric ejection proteins which form a ∼1.5-MDa ejectosome that must transition through the ∼30 Å aperture created by the short tail nozzle assembly that acts as the conduit for the passage of DNA during infection. The ejectosome forms several grooves into which coils of genomic DNA are fit before the DNA sharply turns and goes down the tunnel and into the portal. In addition, we reconstructed the icosahedral capsid and hybrid tail apparatus to resolutions between 3.04 and 3.23 Å, and note an uncommon fold adopted by the dimerized decoration proteins which further emphasize the structural diversity of podophages. These reconstructions have allowed the generation of a complete atomic model of the ΦM1, uncovering two distinct decoration proteins and highlighting the exquisite structural diversity of tailed bacteriophages. |
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手法 | EM (単粒子) |
解像度 | 2.98 - 10.32 Å |
構造データ | EMDB-43109, PDB-8vb0: EMDB-43110, PDB-8vb2: ![]() EMDB-43111: Pectobacterium phage PhiM1 ejectosome C8 map EMDB-43112, PDB-8vb4: EMDB-43127, PDB-8vbx: ![]() EMDB-43132: Asymmetric composite map of Pectobacterium phage PhiM1 ![]() EMDB-43135: Pectobacterium phage PhiM1 D12 capsid dimer map ![]() EMDB-46790: Asymmetric reconstruction of the PhiM1 tail and ejectosome complexes. |
由来 |
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![]() | VIRUS / Mature capsid / Bacteriophage / Decoration protein / alpha-claw / VIRAL PROTEIN / ejectosome / internal core / internal proteins / core / mature phage / portal / phage / phage portal / portal complex / adaptor protein / portal adaptor complex / podophage / autographiviridae / Tail / fiber / fibre / complex / nozzle / protein / assembly |