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• W2074348023 abstract "Lambda chromosomes are cut and packaged from concatemeric DNA by phage enzyme terminase. Terminase initiates DNA packaging by binding at a site called cosB and introducing staggered nicks at an adjacent site, cosN, to generate the left cohesive end of the DNA molecule to be packaged. After DNA packaging terminase recognizes and cuts the terminal cosN, an event that does not require a wild-type cosB. In this work a site, called cosQ, has been identified that is required for termination of DNA packaging. cosQ, defined by mutations in a sequence called R4, is located approximately 30 bp upstream from cosN. The order of sites is cosQ-cosN-cosB. Helper packaging of repressed, tandem prophage chromosomes demonstrated that a cosQ point mutation affects DNA packaging only when placed at the terminal cos site, whereas cosB mutations only affect packaging initiation. In vitro packaging studies confirmed that cosQ mutations do not affect packaging initiation. In vivo studies indicated that cosQ mutations do not affect cutting of initial cos sites but do cause a defect in packaging termination. cosQ mutants accumulated expanded phage heads, indicating that cosQ mutations affect a step that occurs after packaging of a substantial length of phage DNA. These results show that cosQ mutations define a site required for use of cos sites present at the ends of lambda chromosomes undergoing packaging. Available evidence suggests that other viruses, including phages T3 and T7 and the herpesviruses, may ultimately prove to use cosQ-like sites for packaging termination." @default.
• W2074348023 created "2016-06-24" @default.
• W2074348023 creator A5027062675 @default.
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• W2074348023 date "1993-10-15" @default.
• W2074348023 modified "2023-10-16" @default.
• W2074348023 title "A site required for termination of packaging of the phage lambda chromosome." @default.
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• W2074348023 doi "https://doi.org/10.1073/pnas.90.20.9290" @default.
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