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- W1583470782 abstract "Conjugative DNA transfer of IncI1 plasmid R64 is initiated by the introduction of a site- and strand-specific nick into the origin of transfer (oriT). In R64 oriT, 17-bp (repeat A and B) and 8-bp inverted-repeat sequences with mismatches are located 8 bp away from the nick site. The nicking is mediated by R64 NikA and NikB proteins. To analyze the functional organization of the R64 oriT region, various deletion, insertion, and substitution mutations were introduced into a 92-bp minimal R64 oriT sequence and their effects on oriT function were investigated. This detailed analysis confirms our previous prediction that the R64 oriT region consists of an oriT core sequence and additional sequences necessary for full oriT activity. The oriT core sequence consists of the repeat A sequence, which is recognized by R64 NikA protein, and the nick region sequence, which is conserved among various origins of transfer and is most probably recognized by NikB protein. The oriT core sequence is sufficient for NikAB-mediated oriT-specific nicking. Furthermore, it was shown that the repeat A sequence is essential for localization to a precise position relative to the nick site for oriT function. This seems to be required for the formation of a functional ternary complex consisting of NikA and NikB proteins and oriT DNA. The repeat B sequence and 8-bp inverted repeat sequences are suggested to be required for the termination of DNA transfer." @default.
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- W1583470782 date "1997-12-01" @default.
- W1583470782 modified "2023-09-23" @default.
- W1583470782 title "Mutational analysis of the R64 oriT region: requirement for precise location of the NikA-binding sequence" @default.
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- W1583470782 doi "https://doi.org/10.1128/jb.179.23.7291-7297.1997" @default.
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