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Location and characterization of two functions on RP1 that inhibit the fertility of the IncW plasmid R388.

Two fertility-inhibition functions which reduce R388 (IncW) transfer were detected on RP1 (60 kb, IncP). The respective genes, fiwA and fiwB, were mapped by transposon insertion mutagenesis to the regions between coordinates 32.8 to 31.7 kb (fiwA), and 59.8 to 0.8 kb (fiwB). The fiwA function occurs in a non-essential region of RP1 whereas fiwB is straddled by essential plasmid-maintenance and host-range determinants and apparently coincides (or overlaps) with the gene for tellurite-resistance.