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- W1939138312 abstract "Plasmids driven by the plasmid replication origin of bacteriophage P1 cannot be established in Escherichia coli strains that are defective for the DNA adenine methylase (dam). Using a composite plasmid that has two origins, we show that the P1 origin cannot function even in a plasmid that is already established in a dam strain. An in vitro replication system for the P1 origin was developed that uses as a substrate M13 replicative-form DNA containing the minimal P1 origin. The reaction mixture contains a crude extract of E. coli and purified P1 RepA protein. In addition to being RepA dependent, synthesis was shown to be dependent on methylation of the dam methylase-sensitive sites of the substrate DNA. As the P1 origin contains five such sites in a small region known to be critical for origin function, it can be concluded that methylation of these sites is a requirement for initiation. This suggests that the postreplicational methylation of the origin may control reinitiation and contribute to the accuracy of the highly stringent copy-number control of the origin in vivo." @default.
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- W1939138312 date "1987-10-01" @default.
- W1939138312 modified "2023-09-24" @default.
- W1939138312 title "P1 plasmid replication requires methylated DNA." @default.
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- W1939138312 doi "https://doi.org/10.1002/j.1460-2075.1987.tb02630.x" @default.
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