Attachment protein G3P
UniProtKB accession: P69168
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Go to UniProtKB: P69168
UniProtKB description: Plays essential roles both in the penetration of the viral genome into the bacterial host via pilus retraction and in the extrusion process. During the initial step of infection, G3P mediates adsorption of the phage to its primary receptor, the tip of host F-pilus. Attachment of the phage causes pilus retraction bringing the viral particle into close proximity of the host cell inner membrane. Binding to the host pilus initiates a change in the G3P conformation, allowing subsequent interaction with the host entry receptors TolA, TolQ and TolR and penetration of the viral DNA into the host cytoplasm. In the extrusion process, G3P mediates the release of the membrane-anchored virion from the cell via its C-terminal domain.
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