A multimeric pore complex in the poxvirus core revealed by integrative structural analysis.

A heteromeric pore in the poxvirus core is built from E8, E6, and L3, forming a hollow hexameric tube spanning the core wall and palisade layer.

• Why it matters: Poxviruses transcribe over a hundred early mRNAs in the core, but how these transcripts exit the core has remained unresolved.
• What they did: Using cryo-electron tomography with deep-learning particle picking, subtomogram averaging, cross-linking mass spectrometry, and AlphaFold3 modeling, the pore architecture and a transcription-linked pore state were resolved.
• The result: A rod-like density in the pore channel is consistent with the viral RNA helicase I8 and may support mRNA release, while transcription conditions reveal a pore state missing outer and basal rings.

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