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- W2093134629 startingPage "10638" @default.
- W2093134629 abstract "The helicase and primase activities of bacteriophage T7 are distributed between the 56- and 63-kDa gene 4 proteins. The 56-kDa gene 4 protein lacks 63 amino acids found at the N terminus of the colinear 63-kDa protein and catalyzes helicase activity. The 63-kDa gene 4 protein catalyzes both primase and helicase activities. A bacteriophage deleted for gene 4, T7 delta 4-1, has been tested for growth by complementation on Escherichia coli strains that contain plasmids expressing either one or both of the gene 4 proteins. T7 delta 4-1 cannot grow (efficiency of plating, 10(-7)) on E. coli cells that express only 56-kDa gene 4 protein. In contrast, T7 delta 4-1 has an efficiency of plating of 0.1 on an E. coli strain that expresses only 63-kDa gene 4 protein in which glycine is substituted for methionine at position 64. A bacteriophage, T7 4B-, in which methionine at residue 64 is replaced by glycine, expresses only 63-kDa gene 4 protein. The burst sizes, latency periods, and Okazaki fragment sizes of T7 4B- are similar in the presence and absence of the 56-kDa gene 4 protein; however, T7 4B- has a reduced rate of DNA synthesis when compared with a phage that synthesizes both gene 4 proteins." @default.
- W2093134629 created "2016-06-24" @default.
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- W2093134629 date "1992-11-15" @default.
- W2093134629 modified "2023-09-27" @default.
- W2093134629 title "Roles of bacteriophage T7 gene 4 proteins in providing primase and helicase functions in vivo." @default.
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- W2093134629 doi "https://doi.org/10.1073/pnas.89.22.10638" @default.
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