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• W2044992803 abstract "The portal vertex structure of the phage P22 is a 2.8 MDa molecular machine that mediates attachment and injection of the viral genome into the host Salmonella enterica serovar Typhimurium. Five proteins form this molecular machine: the portal protein, gp1; the tail-spike, gp9; the tail-needle, gp26, and the tail accessory factors, gp4 and gp10. In order to understand the assembly of the portal vertex structure, we have isolated the gene encoding tail accessory factor gp10 and defined its structural composition and assembly within the portal vertex structure. In solution, monomeric gp10 is a β-sheet-rich protein with a stable conformational structure, which spontaneously assembles into hexamers, likely via a dimeric intermediate. This oligomerization enhances the structural stability of the protein, which then becomes competent for assembly to a preformed portal protein:gp4 complex, and acts as a structural adaptor bridging the nascent phage tail to gp26 and gp9. Notably, in vitro purified tail accessory factors gp4, gp10, and gp26 do not significantly interact with each other in solution, but their assembly takes place efficiently when these factors are added sequentially onto an immobilized portal protein. This suggests that the assembly of the P22 tail is a highly sequential and cooperative process, likely mediated by structural rearrangements in the assembly components. The assembled portal vertex structure represents both a membrane-binding and penetrating device as well as a plug that retains the pressurized phage DNA inside the capsid." @default.
• W2044992803 created "2016-06-24" @default.
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• W2044992803 date "2007-07-01" @default.
• W2044992803 modified "2023-10-14" @default.
• W2044992803 title "Role of Gene 10 Protein in the Hierarchical Assembly of the Bacteriophage P22 Portal Vertex Structure" @default.
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• W2044992803 doi "https://doi.org/10.1021/bi700186e" @default.
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