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. Subsequent interaction with the host entry receptor tolA induces 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.
"Filamentous phage infection: crystal structure of g3p in complex with its coreceptor, the C-terminal domain of TolA."Lubkowski J., Hennecke F., Plueckthun A., Wlodawer A.Structure 7:711-722(1999)
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