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The nucleotide sequence of the biphenyl catabolic transposon Tn4371 has been completed and analyzed. It confirmed that the element has a mosaic structure made of several building blocks. In addition to previously identified genes coding for a tyrosine recombinase related to phage integrases and for biphenyl degradation enzymes very similar to those of Achromobacter georgiopolitanum KKS102, Tn4371 carries many plasmid-related genes involved in replication, partition, and other, as-yet-unknown, plasmid functions. One gene cluster contains most of the genes required to express a type IV secretion-mating pair formation apparatus coupled with a TraG ATPase, all of which are related to those found on IncP and Ti plasmids. Orthologues of all Tn4371 plasmid-related genes and of the tyrosine recombinase gene were found, with a very similar organization, in the chromosome of Ralstonia solanacearum and …