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Sequence analysis of termini of conjugative transposon Tn916.

Department of Oral Biology, School of Dentistry, University of Michigan, Ann Arbor 48109.

ABSTRACT

Transposon Tn916 is a 16.4-kilobase, broad-host-range, conjugative transposon originally identified on the chromosome of Enterococcus (Streptococcus) faecalis DS16. Its termini have been sequenced along with the junction regions for two different insertions. The ends were found to contain imperfect inverted repeat sequences with identity at 20 of 26 nucleotides. Further in from the ends, imperfect directly repeated sequences were present, with 24 of 27 nucleotides matching. The transposon junction regions contained homologous segments but of a nature not consistent with a direct duplication of the target sequence. Within the right terminus was a potential outwardly reading promoter. Tn916 is believed to transpose via an excision-insertion mechanism; based on the analyses of the termini, as well as two target sequences (before insertion and after excision), a possible model is suggested.

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