30za | pdb_000030za
Part of the tail tube of the phage OE33PA
Structural highlights
Publication Abstract from PubMedBacteriophages (phages) infecting Gram-positive bacteria must bind to host receptors across thick cell walls to initiate infection, yet the underlying structural mechanisms remain unclear. Here, we report cryo-electron microscopy structures of the Oenococcus oeni siphophage OE33PA, providing the first atomic resolution view of a phage infecting this bacterium important for the wine industry. While the overall virion architecture is conserved, the adhesion device displays distinctive features. Its receptor-binding proteins adopt multiple orientations, revealing an intrinsically dynamic assembly. In situ cryo-electron tomography captures distinct conformations upon host attachment, providing rare structural insight into interactions with Gram-positive hosts. Additionally, functional assays show that a highly mobile carbohydrate-binding module in the distal tail protein mediates host-specific binding. Furthermore, the tape measure protein, central to phage assembly and infectivity, adopts a hexameric organization, updating the prevailing trimeric model in siphophages. Together, these findings reveal a dynamic adhesion device in a phage infecting Gram-positive bacteria and highlight the structural and functional diversity of phages. Dynamic adhesion device of phage OE33PA drives Gram-positive host recognition.,Schmitt L, Chaib A, Ptchelkine D, Kandiah E, Le Marrec C, Cambillau C, Goulet A bioRxiv [Preprint]. 2026 May 25:2026.05.20.726473. doi: , 10.64898/2026.05.20.726473. PMID:42244550[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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