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G7P (pVII) and G9P (pIX) initiate concomitant virion assembly and extrusion at the host inner membrane by interacting with the viral genome packaging signal and form the distal tip that emerges first from the host cell.
"May initiate with G9P the virion concomitant assembly-budding process, by interacting with the packaging signal of the viral genome. The assembly-budding takes place at the host inner membrane. In turn, G7P and G9P are present at the end of the filamentous virion that emerges first from the bacterial host."
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Five copies of G7P form a symmetric plug at the apex of the virion tail round tip in complex with G9P and G8P, and reside in the host inner membrane prior to assembly.
"Homopentamer (PubMed:37669979). G7P pentamer forms a symmetric plug-like structure located at the topmiddle of the virion tail round tip (PubMed:37669979). Interacts with G9P; this interaction allows integration of G7P and G9P into the virion tail round tip (PubMed:37669979)."
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Prior to assembly, G7P is associated with the bacterial host inner membrane.
"Prior to assembly, is found associated with the bacterial host inner membrane. There are about five copies of this protein per mature phage that are located on the tail side of the filamentous virion with G9P (By similarity)."