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We have isolated a new transposon, Tn3411, encoding citrate-utilizing ability, from a naturally occurring citrate utilization (Cit) plasmid, pOH3001. Citrate transposon Tn3411 was transposed from pOH3001 to lambda b519 b515 cI857 S7 (abbreviated lambda bb) phage, and further from the resulting lambda bb:Tn3411 to a vector plasmid, pBR322, in recA-deficient strains. The Cit+ plasmids (pOH2 and pOH3) constructed by the integration of Tn3411 into pBR322 were examined by restriction endonuclease and heteroduplex analysis. The results obtained were as follows: (i) Tn3411 was 7.4 kilobases long and flanked by small inverted repeats, and it contained one more pair of inverted repeats at the opposite orientation in the internal region, thus making alternate repeats; and (ii) the Cit+ structure gene was located on the fragment (5.5 kilobases) between two SalI cleavage sites on Tn3411.

Identification of citrate utilization transposon Tn3411 from a naturally occurring citrate utilization plasmid