High-resolution cryo-EM structure of the Shigella virus Sf6 genome delivery tail machine.
High-resolution cryo-EM structure of the Shigella virus Sf6 genome delivery tail machine.
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DOI:
10.1126/sciadv.adc9641
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发表时间:
2022-12-09
期刊:
影响因子:
13.6
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中科院分区:
文献类型:
--
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Sf6 is a bacterial virus that infects the human pathogen Shigella flexneri. Here, we describe the cryo–electron microscopy structure of the Sf6 tail machine before DNA ejection, which we determined at a 2.7-angstrom resolution. We built de novo structures of all tail components and resolved four symmetry-mismatched interfaces. Unexpectedly, we found that the tail exists in two conformations, rotated by ~6° with respect to the capsid. The two tail conformers are identical in structure but differ solely in how the portal and head-to-tail adaptor carboxyl termini bond with the capsid at the fivefold vertex, similar to a diamond held over a five-pronged ring in two nonidentical states. Thus, in the mature Sf6 tail, the portal structure does not morph locally to accommodate the symmetry mismatch but exists in two energetic minima rotated by a discrete angle. We propose that the design principles of the Sf6 tail are conserved across P22-like Podoviridae. Cryo-EM reveals the building blocks, assembly, and symmetry mismatches of the Shigella virus Sf6 tail apparatus.
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DOI:
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期刊:
MICROBIOLOGY-UK
影响因子:
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发表时间:
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期刊:
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影响因子:
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