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- W1723996811 abstract "We improved chromosomal gene transfer in Agrobacterium tumefaciens strain 15955 by constructing donors containing homologous transposons on both the sex factor plasmid and chromosome. First, we constructed plasmid pDP35, a kanamycin-sensitive derivative of R68.45. We then constructed derivatives of pDP35 that contained insertions of the kanamycin resistance transposon Tn5. By restriction endonuclease analysis, we identified two plasmids, pDP37 and pDP38, in which Tn5 was inserted in the same region of the plasmid but in opposite orientations. We also constructed isolates of A. tumefaciens containing an insertion of Tn5 in the chromosome. We transferred pDP37 or pDP38 into these chromosomal Tn5 strains and tested their ability to mobilize chromosomal markers to a series of auxotrophic recipients. Mobilization was observed at frequencies ranging from 10(-4) to 10(-7) recombinants per input donor for most markers tested. Both the plasmid and the chromosomal Tn5 elements were found to be required for mobilization at these higher frequencies. Donors were shown to transfer chromosomal markers in a polarized fashion. Recombinants coinherited unselected markers at frequencies of from 100 to 0.3 percent. The improved transfer frequencies and the observed polarity in chromosome transfer suggest that with this method we can genetically characterize A. tumefaciens chromosomal functions." @default.
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- W1723996811 date "1983-03-01" @default.
- W1723996811 modified "2023-10-14" @default.
- W1723996811 title "Transposon-facilitated chromosome mobilization in Agrobacterium tumefaciens" @default.
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- W1723996811 doi "https://doi.org/10.1128/jb.153.3.1451-1460.1983" @default.
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