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- W1590352511 abstract "The conjugative plasmid pAD1 (56.7 kilobases) in Streptococcus faecalis has been shown to confer a mating response to the sex pheromone cAD1 excreted by recipient strains. The response is characterized by the synthesis of a proteinaceous adhesin which coats the surface of the pAD1 -containing donor cell and facilitates the formation of mating aggregates. Donors exposed to cAD1 -containing filtrates of recipients undergo self-aggregation (clumping), an event believed to be associated with an interaction between the adhesin and a binding substance always present on the surface of both recipients and donors. To analyze the molecular processes involved in the mating response, mutants were generated by the erythromycin resistance transposon Tn917 . Transpositions to pAD1 in S. faecalis DS16 gave rise to a number of derivatives that exhibited constitutive clumping and the ability to transfer at high frequencies in short (10-min) matings. These mutants fell into two subclasses, which exhibited colony morphologies that were dry or normal. The Tn917 insertions were mapped by restriction enzyme analysis to two separate clusters, designated traA and traB. The dry colony subclass corresponded to traA and represented a span of 1.5 kilobases, whereas the normal subclass corresponded to traB and spanned 1.3 kilobases. The two clusters were separated by 1.7 kilobases in which insertions of Tn917 did not affect the ability to respond normally to cAD1 . Neither type of constitutive clumper produced cAD1 . Another series of insertions exhibited reduced donor potential. In two cases, the reduction in transfer was three to four orders of magnitude; these mapped in traA . In two other cases, the reduction was one to two orders of magnitude. These mapped outside of traA and traB, and one was associated with an increase in plasmid copy number." @default.
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- W1590352511 date "1984-06-01" @default.
- W1590352511 modified "2023-10-02" @default.
- W1590352511 title "Genetic analysis of the pAD1 pheromone response in Streptococcus faecalis, using transposon Tn917 as an insertional mutagen" @default.
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- W1590352511 doi "https://doi.org/10.1128/jb.158.3.777-783.1984" @default.
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