SUMMARY: MT15 is the host of the large (250 kbp) TOL plasmid pWW15. We have shown by a combination of hybridization, molecular cloning and enzyme assay that pWW15 carries two distinct regions which share homology with the upper pathway operons () of other TOL plasmids and two distinct regions which are homologous to the pathway operons () of other TOL plasmids. Both the areas of homology to the upper pathway operons appear to carry all of the structural genes for the three catabolic enzymes of the operon. One of the regions of pathway operon homology encodes a complete functional pathway, but the second is incomplete and appears to carry only the genes from downstream.


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