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- W1960740641 abstract "A 600-bp oriT-containing DNA fragment from the Rhodobacter sphaeroides 2.4.1 S factor (oriTs) (A. Suwanto and S. Kaplan, J. Bacteriol. 174:1124-1134, 1992) was shown to promote polarized chromosomal transfer when provided in cis. A Kmr-oriTs-sacR-sacB (KTS) DNA cassette was constructed by inserting oriTs-sacR-sacB into a pUTmini-Tn5 Km1 derivative. With this delivery system, KTS appeared to be randomly inserted into the genome of R. sphaeroides, generating mutant strains which also gained the ability to act as Hfr donors. An AseI site in the Kmr cartridge (from Tn903) and DraI and SnaBI sites in sacR-sacB (the levansucrase gene from Bacillus subtilis) were employed to localize the KTS insertion definitively by pulsed-field gel electrophoresis. The orientation of oriTs at the site of insertion was determined by Southern hybridization analysis. Interrupted mating experiments performed with some of the Hfr strains exhibited a gradient of marker transfer and further provided genetic evidence for the circularity and presence of two chromosomal linkage groups in this bacterium. The genetic and environmental conditions for optimized mating between R. sphaeroides strains were also defined. The results presented here and our physical map of the R. sphaeroides 2.4.1 genome are discussed in light of the presence of two chromosomes." @default.
- W1960740641 created "2016-06-24" @default.
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- W1960740641 date "1992-02-01" @default.
- W1960740641 modified "2023-09-26" @default.
- W1960740641 title "Chromosome transfer in Rhodobacter sphaeroides: Hfr formation and genetic evidence for two unique circular chromosomes" @default.
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- W1960740641 doi "https://doi.org/10.1128/jb.174.4.1135-1145.1992" @default.
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