Abstract
A Tn 21-related mercury resistance transposon, Tn 5060, has been isolated from Pseudomonas sp. strain A19-1 from a 8000–10 000-year-old Siberian permafrost sample, and sequenced. Like Tn 21, the element transposes to different plasmids at a frequency of 10 −2–10 −3 per target plasmid transfer. Comparison of the complete Tn 5060 DNA sequence (8667 bp) with that of Tn 21 (19 672 bp) shows that Tn 5060 does not contain integron In2 and deviates from Tn 21 in four nucleotide positions. These and other comparative data demonstrate that Tn 5060 is the most closely related of the characterized mercury resistances to the as yet hypothetical immediate ancestor of Tn 21, Tn X.
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