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Discovery and characterization of a new transposable element, Tn4811, in Streptomyces lividans 66.

Institute of Genetics, National Yang-Ming Medical College, Taipei, Taiwan, Republic of China.

ABSTRACT

Transposition of a new 5.4-kb transposon, Tn4811, of Streptomyces lividans to the melC operon of Streptomyces antibioticus on plasmid pIJ702 was discovered. The nucleotide sequence of this copy of Tn4811, which contained an imperfect (9 of 11 bp) terminal inverted repeat, five putative Streptomyces coding sequences for an oxidoreductase and its transcription regulator, and three transposition-related proteins, was determined. SLP- strains of S. lividans contained one copy (A) of Tn4811, while SLP2+ strains contained an additional copy (B) on the SLP2 plasmid. The nucleotide sequences at three insertion junctions of Tn4811 were determined. Copy B lacked 41 bp from the left end. At the other five junctions the duplication of a putative 3-bp target sequence (TGA) was observed. A sequence of less than 3 kb homologous to Tn4811 was present in S. antibioticus. DNA homologous to Tn4811 was not detected in 14 other Streptomyces species.

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