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- W2054436224 abstract "The minus origins for complementary strand DNA synthesis (-ori) of Escherichia coli spherical single-stranded DNA (microvirid) phages G4, phi K, alpha 3, and St-1 closely resemble each other in DNA structure and contain two potential secondary hairpin loops (I and II) that have been implicated as direct recognition sites for host E. coli dnaG protein (primase). We introduced mutations (deletion or insertion) within the -ori regions of phi K and G4 by the nuclease digestion method. Mutants thus constructed produced minute plaques, showed thermosensitivity, and they remarkably reduced the phage yield and rate of viral DNA synthesis. Deletions in the phi K mutants (dTa) were ranging from 1 nucleotide (nt) to 102 nt centered at the hairpin II; a dTa8 mutant was entirely lacking in the two hairpins besides the starting point for primer RNA synthesis. On the other hand, the G4 mutants (dSa) had deletions centered at hairpin I; two mutants dSa35 and dXN completely lost the hairpin I and the primer RNA starting point. In addition, progeny phage populations of several phi K and G4 mutants contained revertant-like phages. DNA sequencing analysis revealed that these secondary phages had been generated by spontaneous DNA rearrangement with additional insertion or deletion near the parental mutation sites, via an unknown recA-independent pathway." @default.
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- W2054436224 date "1995-01-01" @default.
- W2054436224 modified "2023-09-27" @default.
- W2054436224 title "Comparative studies on the minus origin mutants of Escherichia coli spherical single-stranded DNA phages" @default.
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- W2054436224 doi "https://doi.org/10.1016/0167-4781(94)00200-m" @default.
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