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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Characterization, nucleotide sequence, and conserved genomic locations of insertion sequence ISRm5 in Rhizobium meliloti.

A target for ISRm3 transposition in Rhizobium meliloti IZ450 is another insertion sequence element, named ISRm5. ISRm5 is 1,340 bp in length and possesses terminal inverted repeats of unequal lengths (27 and 28 bp) and contain five mismatches. An open reading frame that spans 89% of the length of one DNA strand encodes a putative transposase with significant similarity to the putative transposases of 11 insertion sequence elements from diverse bacterial species, including ISRm3 from R. meliloti. Multiple copies and variants of ISRm5 occur in the R. meliloti genome, often in close association with ISRm3. Five ISRm5 copies in two strains were studied, and each was found to be located between 8-bp direct repeats. At two of these loci, which were shown to be highly conserved in R. meliloti, the copies of ISRm5 were found to be associated with pairs of short inverted repeats resembling transcription terminators. This structural arrangement not only may provide a conserved niche for ISRm5 but also may be a preferred target for transposition.[1]


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