CryoEM structure and assembly mechanism of a bacterial virus genome gatekeeper

Igor Orlov, Stéphane Roche, Sandrine Brasilès, Natalya Lukoyanova, Marie-Christine Vaney, Paulo Tavares () and Elena V. Orlova ()
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Igor Orlov: Université de Strasbourg
Stéphane Roche: Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC)
Sandrine Brasilès: Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC)
Natalya Lukoyanova: Birkbeck College
Marie-Christine Vaney: Institut Pasteur, Université Paris Cité, CNRS UMR3569, Unité de Virologie Structurale
Paulo Tavares: Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC)
Elena V. Orlova: Birkbeck College

Nature Communications, 2022, vol. 13, issue 1, 1-12

Abstract: Abstract Numerous viruses package their dsDNA genome into preformed capsids through a portal gatekeeper that is subsequently closed. We report the structure of the DNA gatekeeper complex of bacteriophage SPP1 (gp612gp1512gp166) in the post-DNA packaging state at 2.7 Å resolution obtained by single particle cryo-electron microscopy. Comparison of the native SPP1 complex with assembly-naïve structures of individual components uncovered the complex program of conformational changes leading to its assembly. After DNA packaging, gp15 binds via its C-terminus to the gp6 oligomer positioning gp15 subunits for oligomerization. Gp15 refolds its inner loops creating an intersubunit β-barrel that establishes different types of contacts with six gp16 subunits. Gp16 binding and oligomerization is accompanied by folding of helices that close the portal channel to keep the viral genome inside the capsid. This mechanism of assembly has broad functional and evolutionary implications for viruses of the prokaryotic tailed viruses-herpesviruses lineage.

Date: 2022
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DOI: 10.1038/s41467-022-34999-8

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